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linux-zen-server/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c

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// SPDX-License-Identifier: GPL-2.0
/*
* Cadence MHDP8546 DP bridge driver.
*
* Copyright (C) 2020 Cadence Design Systems, Inc.
*
* Authors: Quentin Schulz <quentin.schulz@free-electrons.com>
* Swapnil Jakhade <sjakhade@cadence.com>
* Yuti Amonkar <yamonkar@cadence.com>
* Tomi Valkeinen <tomi.valkeinen@ti.com>
* Jyri Sarha <jsarha@ti.com>
*
* TODO:
* - Implement optimized mailbox communication using mailbox interrupts
* - Add support for power management
* - Add support for features like audio, MST and fast link training
* - Implement request_fw_cancel to handle HW_STATE
* - Fix asynchronous loading of firmware implementation
* - Add DRM helper function for cdns_mhdp_lower_link_rate
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/firmware.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/irq.h>
#include <linux/media-bus-format.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/phy/phy.h>
#include <linux/phy/phy-dp.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/wait.h>
#include <drm/display/drm_dp_helper.h>
#include <drm/display/drm_hdcp_helper.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_atomic_state_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_connector.h>
#include <drm/drm_edid.h>
#include <drm/drm_modeset_helper_vtables.h>
#include <drm/drm_print.h>
#include <drm/drm_probe_helper.h>
#include <asm/unaligned.h>
#include "cdns-mhdp8546-core.h"
#include "cdns-mhdp8546-hdcp.h"
#include "cdns-mhdp8546-j721e.h"
static int cdns_mhdp_mailbox_read(struct cdns_mhdp_device *mhdp)
{
int ret, empty;
WARN_ON(!mutex_is_locked(&mhdp->mbox_mutex));
ret = readx_poll_timeout(readl, mhdp->regs + CDNS_MAILBOX_EMPTY,
empty, !empty, MAILBOX_RETRY_US,
MAILBOX_TIMEOUT_US);
if (ret < 0)
return ret;
return readl(mhdp->regs + CDNS_MAILBOX_RX_DATA) & 0xff;
}
static int cdns_mhdp_mailbox_write(struct cdns_mhdp_device *mhdp, u8 val)
{
int ret, full;
WARN_ON(!mutex_is_locked(&mhdp->mbox_mutex));
ret = readx_poll_timeout(readl, mhdp->regs + CDNS_MAILBOX_FULL,
full, !full, MAILBOX_RETRY_US,
MAILBOX_TIMEOUT_US);
if (ret < 0)
return ret;
writel(val, mhdp->regs + CDNS_MAILBOX_TX_DATA);
return 0;
}
static int cdns_mhdp_mailbox_recv_header(struct cdns_mhdp_device *mhdp,
u8 module_id, u8 opcode,
u16 req_size)
{
u32 mbox_size, i;
u8 header[4];
int ret;
/* read the header of the message */
for (i = 0; i < sizeof(header); i++) {
ret = cdns_mhdp_mailbox_read(mhdp);
if (ret < 0)
return ret;
header[i] = ret;
}
mbox_size = get_unaligned_be16(header + 2);
if (opcode != header[0] || module_id != header[1] ||
req_size != mbox_size) {
/*
* If the message in mailbox is not what we want, we need to
* clear the mailbox by reading its contents.
*/
for (i = 0; i < mbox_size; i++)
if (cdns_mhdp_mailbox_read(mhdp) < 0)
break;
return -EINVAL;
}
return 0;
}
static int cdns_mhdp_mailbox_recv_data(struct cdns_mhdp_device *mhdp,
u8 *buff, u16 buff_size)
{
u32 i;
int ret;
for (i = 0; i < buff_size; i++) {
ret = cdns_mhdp_mailbox_read(mhdp);
if (ret < 0)
return ret;
buff[i] = ret;
}
return 0;
}
static int cdns_mhdp_mailbox_send(struct cdns_mhdp_device *mhdp, u8 module_id,
u8 opcode, u16 size, u8 *message)
{
u8 header[4];
int ret, i;
header[0] = opcode;
header[1] = module_id;
put_unaligned_be16(size, header + 2);
for (i = 0; i < sizeof(header); i++) {
ret = cdns_mhdp_mailbox_write(mhdp, header[i]);
if (ret)
return ret;
}
for (i = 0; i < size; i++) {
ret = cdns_mhdp_mailbox_write(mhdp, message[i]);
if (ret)
return ret;
}
return 0;
}
static
int cdns_mhdp_reg_read(struct cdns_mhdp_device *mhdp, u32 addr, u32 *value)
{
u8 msg[4], resp[8];
int ret;
put_unaligned_be32(addr, msg);
mutex_lock(&mhdp->mbox_mutex);
ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_GENERAL,
GENERAL_REGISTER_READ,
sizeof(msg), msg);
if (ret)
goto out;
ret = cdns_mhdp_mailbox_recv_header(mhdp, MB_MODULE_ID_GENERAL,
GENERAL_REGISTER_READ,
sizeof(resp));
if (ret)
goto out;
ret = cdns_mhdp_mailbox_recv_data(mhdp, resp, sizeof(resp));
if (ret)
goto out;
/* Returned address value should be the same as requested */
if (memcmp(msg, resp, sizeof(msg))) {
ret = -EINVAL;
goto out;
}
*value = get_unaligned_be32(resp + 4);
out:
mutex_unlock(&mhdp->mbox_mutex);
if (ret) {
dev_err(mhdp->dev, "Failed to read register\n");
*value = 0;
}
return ret;
}
static
int cdns_mhdp_reg_write(struct cdns_mhdp_device *mhdp, u16 addr, u32 val)
{
u8 msg[6];
int ret;
put_unaligned_be16(addr, msg);
put_unaligned_be32(val, msg + 2);
mutex_lock(&mhdp->mbox_mutex);
ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX,
DPTX_WRITE_REGISTER, sizeof(msg), msg);
mutex_unlock(&mhdp->mbox_mutex);
return ret;
}
static
int cdns_mhdp_reg_write_bit(struct cdns_mhdp_device *mhdp, u16 addr,
u8 start_bit, u8 bits_no, u32 val)
{
u8 field[8];
int ret;
put_unaligned_be16(addr, field);
field[2] = start_bit;
field[3] = bits_no;
put_unaligned_be32(val, field + 4);
mutex_lock(&mhdp->mbox_mutex);
ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX,
DPTX_WRITE_FIELD, sizeof(field), field);
mutex_unlock(&mhdp->mbox_mutex);
return ret;
}
static
int cdns_mhdp_dpcd_read(struct cdns_mhdp_device *mhdp,
u32 addr, u8 *data, u16 len)
{
u8 msg[5], reg[5];
int ret;
put_unaligned_be16(len, msg);
put_unaligned_be24(addr, msg + 2);
mutex_lock(&mhdp->mbox_mutex);
ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX,
DPTX_READ_DPCD, sizeof(msg), msg);
if (ret)
goto out;
ret = cdns_mhdp_mailbox_recv_header(mhdp, MB_MODULE_ID_DP_TX,
DPTX_READ_DPCD,
sizeof(reg) + len);
if (ret)
goto out;
ret = cdns_mhdp_mailbox_recv_data(mhdp, reg, sizeof(reg));
if (ret)
goto out;
ret = cdns_mhdp_mailbox_recv_data(mhdp, data, len);
out:
mutex_unlock(&mhdp->mbox_mutex);
return ret;
}
static
int cdns_mhdp_dpcd_write(struct cdns_mhdp_device *mhdp, u32 addr, u8 value)
{
u8 msg[6], reg[5];
int ret;
put_unaligned_be16(1, msg);
put_unaligned_be24(addr, msg + 2);
msg[5] = value;
mutex_lock(&mhdp->mbox_mutex);
ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX,
DPTX_WRITE_DPCD, sizeof(msg), msg);
if (ret)
goto out;
ret = cdns_mhdp_mailbox_recv_header(mhdp, MB_MODULE_ID_DP_TX,
DPTX_WRITE_DPCD, sizeof(reg));
if (ret)
goto out;
ret = cdns_mhdp_mailbox_recv_data(mhdp, reg, sizeof(reg));
if (ret)
goto out;
if (addr != get_unaligned_be24(reg + 2))
ret = -EINVAL;
out:
mutex_unlock(&mhdp->mbox_mutex);
if (ret)
dev_err(mhdp->dev, "dpcd write failed: %d\n", ret);
return ret;
}
static
int cdns_mhdp_set_firmware_active(struct cdns_mhdp_device *mhdp, bool enable)
{
u8 msg[5];
int ret, i;
msg[0] = GENERAL_MAIN_CONTROL;
msg[1] = MB_MODULE_ID_GENERAL;
msg[2] = 0;
msg[3] = 1;
msg[4] = enable ? FW_ACTIVE : FW_STANDBY;
mutex_lock(&mhdp->mbox_mutex);
for (i = 0; i < sizeof(msg); i++) {
ret = cdns_mhdp_mailbox_write(mhdp, msg[i]);
if (ret)
goto out;
}
/* read the firmware state */
ret = cdns_mhdp_mailbox_recv_data(mhdp, msg, sizeof(msg));
if (ret)
goto out;
ret = 0;
out:
mutex_unlock(&mhdp->mbox_mutex);
if (ret < 0)
dev_err(mhdp->dev, "set firmware active failed\n");
return ret;
}
static
int cdns_mhdp_get_hpd_status(struct cdns_mhdp_device *mhdp)
{
u8 status;
int ret;
mutex_lock(&mhdp->mbox_mutex);
ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX,
DPTX_HPD_STATE, 0, NULL);
if (ret)
goto err_get_hpd;
ret = cdns_mhdp_mailbox_recv_header(mhdp, MB_MODULE_ID_DP_TX,
DPTX_HPD_STATE,
sizeof(status));
if (ret)
goto err_get_hpd;
ret = cdns_mhdp_mailbox_recv_data(mhdp, &status, sizeof(status));
if (ret)
goto err_get_hpd;
mutex_unlock(&mhdp->mbox_mutex);
dev_dbg(mhdp->dev, "%s: HPD %splugged\n", __func__,
status ? "" : "un");
return status;
err_get_hpd:
mutex_unlock(&mhdp->mbox_mutex);
return ret;
}
static
int cdns_mhdp_get_edid_block(void *data, u8 *edid,
unsigned int block, size_t length)
{
struct cdns_mhdp_device *mhdp = data;
u8 msg[2], reg[2], i;
int ret;
mutex_lock(&mhdp->mbox_mutex);
for (i = 0; i < 4; i++) {
msg[0] = block / 2;
msg[1] = block % 2;
ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX,
DPTX_GET_EDID, sizeof(msg), msg);
if (ret)
continue;
ret = cdns_mhdp_mailbox_recv_header(mhdp, MB_MODULE_ID_DP_TX,
DPTX_GET_EDID,
sizeof(reg) + length);
if (ret)
continue;
ret = cdns_mhdp_mailbox_recv_data(mhdp, reg, sizeof(reg));
if (ret)
continue;
ret = cdns_mhdp_mailbox_recv_data(mhdp, edid, length);
if (ret)
continue;
if (reg[0] == length && reg[1] == block / 2)
break;
}
mutex_unlock(&mhdp->mbox_mutex);
if (ret)
dev_err(mhdp->dev, "get block[%d] edid failed: %d\n",
block, ret);
return ret;
}
static
int cdns_mhdp_read_hpd_event(struct cdns_mhdp_device *mhdp)
{
u8 event = 0;
int ret;
mutex_lock(&mhdp->mbox_mutex);
ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX,
DPTX_READ_EVENT, 0, NULL);
if (ret)
goto out;
ret = cdns_mhdp_mailbox_recv_header(mhdp, MB_MODULE_ID_DP_TX,
DPTX_READ_EVENT, sizeof(event));
if (ret < 0)
goto out;
ret = cdns_mhdp_mailbox_recv_data(mhdp, &event, sizeof(event));
out:
mutex_unlock(&mhdp->mbox_mutex);
if (ret < 0)
return ret;
dev_dbg(mhdp->dev, "%s: %s%s%s%s\n", __func__,
(event & DPTX_READ_EVENT_HPD_TO_HIGH) ? "TO_HIGH " : "",
(event & DPTX_READ_EVENT_HPD_TO_LOW) ? "TO_LOW " : "",
(event & DPTX_READ_EVENT_HPD_PULSE) ? "PULSE " : "",
(event & DPTX_READ_EVENT_HPD_STATE) ? "HPD_STATE " : "");
return event;
}
static
int cdns_mhdp_adjust_lt(struct cdns_mhdp_device *mhdp, unsigned int nlanes,
unsigned int udelay, const u8 *lanes_data,
u8 link_status[DP_LINK_STATUS_SIZE])
{
u8 payload[7];
u8 hdr[5]; /* For DPCD read response header */
u32 addr;
int ret;
if (nlanes != 4 && nlanes != 2 && nlanes != 1) {
dev_err(mhdp->dev, "invalid number of lanes: %u\n", nlanes);
ret = -EINVAL;
goto out;
}
payload[0] = nlanes;
put_unaligned_be16(udelay, payload + 1);
memcpy(payload + 3, lanes_data, nlanes);
mutex_lock(&mhdp->mbox_mutex);
ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX,
DPTX_ADJUST_LT,
sizeof(payload), payload);
if (ret)
goto out;
/* Yes, read the DPCD read command response */
ret = cdns_mhdp_mailbox_recv_header(mhdp, MB_MODULE_ID_DP_TX,
DPTX_READ_DPCD,
sizeof(hdr) + DP_LINK_STATUS_SIZE);
if (ret)
goto out;
ret = cdns_mhdp_mailbox_recv_data(mhdp, hdr, sizeof(hdr));
if (ret)
goto out;
addr = get_unaligned_be24(hdr + 2);
if (addr != DP_LANE0_1_STATUS)
goto out;
ret = cdns_mhdp_mailbox_recv_data(mhdp, link_status,
DP_LINK_STATUS_SIZE);
out:
mutex_unlock(&mhdp->mbox_mutex);
if (ret)
dev_err(mhdp->dev, "Failed to adjust Link Training.\n");
return ret;
}
/**
* cdns_mhdp_link_power_up() - power up a DisplayPort link
* @aux: DisplayPort AUX channel
* @link: pointer to a structure containing the link configuration
*
* Returns 0 on success or a negative error code on failure.
*/
static
int cdns_mhdp_link_power_up(struct drm_dp_aux *aux, struct cdns_mhdp_link *link)
{
u8 value;
int err;
/* DP_SET_POWER register is only available on DPCD v1.1 and later */
if (link->revision < 0x11)
return 0;
err = drm_dp_dpcd_readb(aux, DP_SET_POWER, &value);
if (err < 0)
return err;
value &= ~DP_SET_POWER_MASK;
value |= DP_SET_POWER_D0;
err = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value);
if (err < 0)
return err;
/*
* According to the DP 1.1 specification, a "Sink Device must exit the
* power saving state within 1 ms" (Section 2.5.3.1, Table 5-52, "Sink
* Control Field" (register 0x600).
*/
usleep_range(1000, 2000);
return 0;
}
/**
* cdns_mhdp_link_power_down() - power down a DisplayPort link
* @aux: DisplayPort AUX channel
* @link: pointer to a structure containing the link configuration
*
* Returns 0 on success or a negative error code on failure.
*/
static
int cdns_mhdp_link_power_down(struct drm_dp_aux *aux,
struct cdns_mhdp_link *link)
{
u8 value;
int err;
/* DP_SET_POWER register is only available on DPCD v1.1 and later */
if (link->revision < 0x11)
return 0;
err = drm_dp_dpcd_readb(aux, DP_SET_POWER, &value);
if (err < 0)
return err;
value &= ~DP_SET_POWER_MASK;
value |= DP_SET_POWER_D3;
err = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value);
if (err < 0)
return err;
return 0;
}
/**
* cdns_mhdp_link_configure() - configure a DisplayPort link
* @aux: DisplayPort AUX channel
* @link: pointer to a structure containing the link configuration
*
* Returns 0 on success or a negative error code on failure.
*/
static
int cdns_mhdp_link_configure(struct drm_dp_aux *aux,
struct cdns_mhdp_link *link)
{
u8 values[2];
int err;
values[0] = drm_dp_link_rate_to_bw_code(link->rate);
values[1] = link->num_lanes;
if (link->capabilities & DP_LINK_CAP_ENHANCED_FRAMING)
values[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
err = drm_dp_dpcd_write(aux, DP_LINK_BW_SET, values, sizeof(values));
if (err < 0)
return err;
return 0;
}
static unsigned int cdns_mhdp_max_link_rate(struct cdns_mhdp_device *mhdp)
{
return min(mhdp->host.link_rate, mhdp->sink.link_rate);
}
static u8 cdns_mhdp_max_num_lanes(struct cdns_mhdp_device *mhdp)
{
return min(mhdp->sink.lanes_cnt, mhdp->host.lanes_cnt);
}
static u8 cdns_mhdp_eq_training_pattern_supported(struct cdns_mhdp_device *mhdp)
{
return fls(mhdp->host.pattern_supp & mhdp->sink.pattern_supp);
}
static bool cdns_mhdp_get_ssc_supported(struct cdns_mhdp_device *mhdp)
{
/* Check if SSC is supported by both sides */
return mhdp->host.ssc && mhdp->sink.ssc;
}
static enum drm_connector_status cdns_mhdp_detect(struct cdns_mhdp_device *mhdp)
{
dev_dbg(mhdp->dev, "%s: %d\n", __func__, mhdp->plugged);
if (mhdp->plugged)
return connector_status_connected;
else
return connector_status_disconnected;
}
static int cdns_mhdp_check_fw_version(struct cdns_mhdp_device *mhdp)
{
u32 major_num, minor_num, revision;
u32 fw_ver, lib_ver;
fw_ver = (readl(mhdp->regs + CDNS_VER_H) << 8)
| readl(mhdp->regs + CDNS_VER_L);
lib_ver = (readl(mhdp->regs + CDNS_LIB_H_ADDR) << 8)
| readl(mhdp->regs + CDNS_LIB_L_ADDR);
if (lib_ver < 33984) {
/*
* Older FW versions with major number 1, used to store FW
* version information by storing repository revision number
* in registers. This is for identifying these FW versions.
*/
major_num = 1;
minor_num = 2;
if (fw_ver == 26098) {
revision = 15;
} else if (lib_ver == 0 && fw_ver == 0) {
revision = 17;
} else {
dev_err(mhdp->dev, "Unsupported FW version: fw_ver = %u, lib_ver = %u\n",
fw_ver, lib_ver);
return -ENODEV;
}
} else {
/* To identify newer FW versions with major number 2 onwards. */
major_num = fw_ver / 10000;
minor_num = (fw_ver / 100) % 100;
revision = (fw_ver % 10000) % 100;
}
dev_dbg(mhdp->dev, "FW version: v%u.%u.%u\n", major_num, minor_num,
revision);
return 0;
}
static int cdns_mhdp_fw_activate(const struct firmware *fw,
struct cdns_mhdp_device *mhdp)
{
unsigned int reg;
int ret;
/* Release uCPU reset and stall it. */
writel(CDNS_CPU_STALL, mhdp->regs + CDNS_APB_CTRL);
memcpy_toio(mhdp->regs + CDNS_MHDP_IMEM, fw->data, fw->size);
/* Leave debug mode, release stall */
writel(0, mhdp->regs + CDNS_APB_CTRL);
/*
* Wait for the KEEP_ALIVE "message" on the first 8 bits.
* Updated each sched "tick" (~2ms)
*/
ret = readl_poll_timeout(mhdp->regs + CDNS_KEEP_ALIVE, reg,
reg & CDNS_KEEP_ALIVE_MASK, 500,
CDNS_KEEP_ALIVE_TIMEOUT);
if (ret) {
dev_err(mhdp->dev,
"device didn't give any life sign: reg %d\n", reg);
return ret;
}
ret = cdns_mhdp_check_fw_version(mhdp);
if (ret)
return ret;
/* Init events to 0 as it's not cleared by FW at boot but on read */
readl(mhdp->regs + CDNS_SW_EVENT0);
readl(mhdp->regs + CDNS_SW_EVENT1);
readl(mhdp->regs + CDNS_SW_EVENT2);
readl(mhdp->regs + CDNS_SW_EVENT3);
/* Activate uCPU */
ret = cdns_mhdp_set_firmware_active(mhdp, true);
if (ret)
return ret;
spin_lock(&mhdp->start_lock);
mhdp->hw_state = MHDP_HW_READY;
/*
* Here we must keep the lock while enabling the interrupts
* since it would otherwise be possible that interrupt enable
* code is executed after the bridge is detached. The similar
* situation is not possible in attach()/detach() callbacks
* since the hw_state changes from MHDP_HW_READY to
* MHDP_HW_STOPPED happens only due to driver removal when
* bridge should already be detached.
*/
if (mhdp->bridge_attached)
writel(~(u32)CDNS_APB_INT_MASK_SW_EVENT_INT,
mhdp->regs + CDNS_APB_INT_MASK);
spin_unlock(&mhdp->start_lock);
wake_up(&mhdp->fw_load_wq);
dev_dbg(mhdp->dev, "DP FW activated\n");
return 0;
}
static void cdns_mhdp_fw_cb(const struct firmware *fw, void *context)
{
struct cdns_mhdp_device *mhdp = context;
bool bridge_attached;
int ret;
dev_dbg(mhdp->dev, "firmware callback\n");
if (!fw || !fw->data) {
dev_err(mhdp->dev, "%s: No firmware.\n", __func__);
return;
}
ret = cdns_mhdp_fw_activate(fw, mhdp);
release_firmware(fw);
if (ret)
return;
/*
* XXX how to make sure the bridge is still attached when
* calling drm_kms_helper_hotplug_event() after releasing
* the lock? We should not hold the spin lock when
* calling drm_kms_helper_hotplug_event() since it may
* cause a dead lock. FB-dev console calls detect from the
* same thread just down the call stack started here.
*/
spin_lock(&mhdp->start_lock);
bridge_attached = mhdp->bridge_attached;
spin_unlock(&mhdp->start_lock);
if (bridge_attached) {
if (mhdp->connector.dev)
drm_kms_helper_hotplug_event(mhdp->bridge.dev);
else
drm_bridge_hpd_notify(&mhdp->bridge, cdns_mhdp_detect(mhdp));
}
}
static int cdns_mhdp_load_firmware(struct cdns_mhdp_device *mhdp)
{
int ret;
ret = request_firmware_nowait(THIS_MODULE, true, FW_NAME, mhdp->dev,
GFP_KERNEL, mhdp, cdns_mhdp_fw_cb);
if (ret) {
dev_err(mhdp->dev, "failed to load firmware (%s), ret: %d\n",
FW_NAME, ret);
return ret;
}
return 0;
}
static ssize_t cdns_mhdp_transfer(struct drm_dp_aux *aux,
struct drm_dp_aux_msg *msg)
{
struct cdns_mhdp_device *mhdp = dev_get_drvdata(aux->dev);
int ret;
if (msg->request != DP_AUX_NATIVE_WRITE &&
msg->request != DP_AUX_NATIVE_READ)
return -EOPNOTSUPP;
if (msg->request == DP_AUX_NATIVE_WRITE) {
const u8 *buf = msg->buffer;
unsigned int i;
for (i = 0; i < msg->size; ++i) {
ret = cdns_mhdp_dpcd_write(mhdp,
msg->address + i, buf[i]);
if (!ret)
continue;
dev_err(mhdp->dev,
"Failed to write DPCD addr %u\n",
msg->address + i);
return ret;
}
} else {
ret = cdns_mhdp_dpcd_read(mhdp, msg->address,
msg->buffer, msg->size);
if (ret) {
dev_err(mhdp->dev,
"Failed to read DPCD addr %u\n",
msg->address);
return ret;
}
}
return msg->size;
}
static int cdns_mhdp_link_training_init(struct cdns_mhdp_device *mhdp)
{
union phy_configure_opts phy_cfg;
u32 reg32;
int ret;
drm_dp_dpcd_writeb(&mhdp->aux, DP_TRAINING_PATTERN_SET,
DP_TRAINING_PATTERN_DISABLE);
/* Reset PHY configuration */
reg32 = CDNS_PHY_COMMON_CONFIG | CDNS_PHY_TRAINING_TYPE(1);
if (!mhdp->host.scrambler)
reg32 |= CDNS_PHY_SCRAMBLER_BYPASS;
cdns_mhdp_reg_write(mhdp, CDNS_DPTX_PHY_CONFIG, reg32);
cdns_mhdp_reg_write(mhdp, CDNS_DP_ENHNCD,
mhdp->sink.enhanced & mhdp->host.enhanced);
cdns_mhdp_reg_write(mhdp, CDNS_DP_LANE_EN,
CDNS_DP_LANE_EN_LANES(mhdp->link.num_lanes));
cdns_mhdp_link_configure(&mhdp->aux, &mhdp->link);
phy_cfg.dp.link_rate = mhdp->link.rate / 100;
phy_cfg.dp.lanes = mhdp->link.num_lanes;
memset(phy_cfg.dp.voltage, 0, sizeof(phy_cfg.dp.voltage));
memset(phy_cfg.dp.pre, 0, sizeof(phy_cfg.dp.pre));
phy_cfg.dp.ssc = cdns_mhdp_get_ssc_supported(mhdp);
phy_cfg.dp.set_lanes = true;
phy_cfg.dp.set_rate = true;
phy_cfg.dp.set_voltages = true;
ret = phy_configure(mhdp->phy, &phy_cfg);
if (ret) {
dev_err(mhdp->dev, "%s: phy_configure() failed: %d\n",
__func__, ret);
return ret;
}
cdns_mhdp_reg_write(mhdp, CDNS_DPTX_PHY_CONFIG,
CDNS_PHY_COMMON_CONFIG |
CDNS_PHY_TRAINING_EN |
CDNS_PHY_TRAINING_TYPE(1) |
CDNS_PHY_SCRAMBLER_BYPASS);
drm_dp_dpcd_writeb(&mhdp->aux, DP_TRAINING_PATTERN_SET,
DP_TRAINING_PATTERN_1 | DP_LINK_SCRAMBLING_DISABLE);
return 0;
}
static void cdns_mhdp_get_adjust_train(struct cdns_mhdp_device *mhdp,
u8 link_status[DP_LINK_STATUS_SIZE],
u8 lanes_data[CDNS_DP_MAX_NUM_LANES],
union phy_configure_opts *phy_cfg)
{
u8 adjust, max_pre_emph, max_volt_swing;
u8 set_volt, set_pre;
unsigned int i;
max_pre_emph = CDNS_PRE_EMPHASIS(mhdp->host.pre_emphasis)
<< DP_TRAIN_PRE_EMPHASIS_SHIFT;
max_volt_swing = CDNS_VOLT_SWING(mhdp->host.volt_swing);
for (i = 0; i < mhdp->link.num_lanes; i++) {
/* Check if Voltage swing and pre-emphasis are within limits */
adjust = drm_dp_get_adjust_request_voltage(link_status, i);
set_volt = min(adjust, max_volt_swing);
adjust = drm_dp_get_adjust_request_pre_emphasis(link_status, i);
set_pre = min(adjust, max_pre_emph)
>> DP_TRAIN_PRE_EMPHASIS_SHIFT;
/*
* Voltage swing level and pre-emphasis level combination is
* not allowed: leaving pre-emphasis as-is, and adjusting
* voltage swing.
*/
if (set_volt + set_pre > 3)
set_volt = 3 - set_pre;
phy_cfg->dp.voltage[i] = set_volt;
lanes_data[i] = set_volt;
if (set_volt == max_volt_swing)
lanes_data[i] |= DP_TRAIN_MAX_SWING_REACHED;
phy_cfg->dp.pre[i] = set_pre;
lanes_data[i] |= (set_pre << DP_TRAIN_PRE_EMPHASIS_SHIFT);
if (set_pre == (max_pre_emph >> DP_TRAIN_PRE_EMPHASIS_SHIFT))
lanes_data[i] |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
}
}
static
void cdns_mhdp_set_adjust_request_voltage(u8 link_status[DP_LINK_STATUS_SIZE],
unsigned int lane, u8 volt)
{
unsigned int s = ((lane & 1) ?
DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT :
DP_ADJUST_VOLTAGE_SWING_LANE0_SHIFT);
unsigned int idx = DP_ADJUST_REQUEST_LANE0_1 - DP_LANE0_1_STATUS + (lane >> 1);
link_status[idx] &= ~(DP_ADJUST_VOLTAGE_SWING_LANE0_MASK << s);
link_status[idx] |= volt << s;
}
static
void cdns_mhdp_set_adjust_request_pre_emphasis(u8 link_status[DP_LINK_STATUS_SIZE],
unsigned int lane, u8 pre_emphasis)
{
unsigned int s = ((lane & 1) ?
DP_ADJUST_PRE_EMPHASIS_LANE1_SHIFT :
DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT);
unsigned int idx = DP_ADJUST_REQUEST_LANE0_1 - DP_LANE0_1_STATUS + (lane >> 1);
link_status[idx] &= ~(DP_ADJUST_PRE_EMPHASIS_LANE0_MASK << s);
link_status[idx] |= pre_emphasis << s;
}
static void cdns_mhdp_adjust_requested_eq(struct cdns_mhdp_device *mhdp,
u8 link_status[DP_LINK_STATUS_SIZE])
{
u8 max_pre = CDNS_PRE_EMPHASIS(mhdp->host.pre_emphasis);
u8 max_volt = CDNS_VOLT_SWING(mhdp->host.volt_swing);
unsigned int i;
u8 volt, pre;
for (i = 0; i < mhdp->link.num_lanes; i++) {
volt = drm_dp_get_adjust_request_voltage(link_status, i);
pre = drm_dp_get_adjust_request_pre_emphasis(link_status, i);
if (volt + pre > 3)
cdns_mhdp_set_adjust_request_voltage(link_status, i,
3 - pre);
if (mhdp->host.volt_swing & CDNS_FORCE_VOLT_SWING)
cdns_mhdp_set_adjust_request_voltage(link_status, i,
max_volt);
if (mhdp->host.pre_emphasis & CDNS_FORCE_PRE_EMPHASIS)
cdns_mhdp_set_adjust_request_pre_emphasis(link_status,
i, max_pre);
}
}
static void cdns_mhdp_print_lt_status(const char *prefix,
struct cdns_mhdp_device *mhdp,
union phy_configure_opts *phy_cfg)
{
char vs[8] = "0/0/0/0";
char pe[8] = "0/0/0/0";
unsigned int i;
for (i = 0; i < mhdp->link.num_lanes; i++) {
vs[i * 2] = '0' + phy_cfg->dp.voltage[i];
pe[i * 2] = '0' + phy_cfg->dp.pre[i];
}
vs[i * 2 - 1] = '\0';
pe[i * 2 - 1] = '\0';
dev_dbg(mhdp->dev, "%s, %u lanes, %u Mbps, vs %s, pe %s\n",
prefix,
mhdp->link.num_lanes, mhdp->link.rate / 100,
vs, pe);
}
static bool cdns_mhdp_link_training_channel_eq(struct cdns_mhdp_device *mhdp,
u8 eq_tps,
unsigned int training_interval)
{
u8 lanes_data[CDNS_DP_MAX_NUM_LANES], fail_counter_short = 0;
u8 link_status[DP_LINK_STATUS_SIZE];
union phy_configure_opts phy_cfg;
u32 reg32;
int ret;
bool r;
dev_dbg(mhdp->dev, "Starting EQ phase\n");
/* Enable link training TPS[eq_tps] in PHY */
reg32 = CDNS_PHY_COMMON_CONFIG | CDNS_PHY_TRAINING_EN |
CDNS_PHY_TRAINING_TYPE(eq_tps);
if (eq_tps != 4)
reg32 |= CDNS_PHY_SCRAMBLER_BYPASS;
cdns_mhdp_reg_write(mhdp, CDNS_DPTX_PHY_CONFIG, reg32);
drm_dp_dpcd_writeb(&mhdp->aux, DP_TRAINING_PATTERN_SET,
(eq_tps != 4) ? eq_tps | DP_LINK_SCRAMBLING_DISABLE :
CDNS_DP_TRAINING_PATTERN_4);
drm_dp_dpcd_read_link_status(&mhdp->aux, link_status);
do {
cdns_mhdp_get_adjust_train(mhdp, link_status, lanes_data,
&phy_cfg);
phy_cfg.dp.lanes = mhdp->link.num_lanes;
phy_cfg.dp.ssc = cdns_mhdp_get_ssc_supported(mhdp);
phy_cfg.dp.set_lanes = false;
phy_cfg.dp.set_rate = false;
phy_cfg.dp.set_voltages = true;
ret = phy_configure(mhdp->phy, &phy_cfg);
if (ret) {
dev_err(mhdp->dev, "%s: phy_configure() failed: %d\n",
__func__, ret);
goto err;
}
cdns_mhdp_adjust_lt(mhdp, mhdp->link.num_lanes,
training_interval, lanes_data, link_status);
r = drm_dp_clock_recovery_ok(link_status, mhdp->link.num_lanes);
if (!r)
goto err;
if (drm_dp_channel_eq_ok(link_status, mhdp->link.num_lanes)) {
cdns_mhdp_print_lt_status("EQ phase ok", mhdp,
&phy_cfg);
return true;
}
fail_counter_short++;
cdns_mhdp_adjust_requested_eq(mhdp, link_status);
} while (fail_counter_short < 5);
err:
cdns_mhdp_print_lt_status("EQ phase failed", mhdp, &phy_cfg);
return false;
}
static void cdns_mhdp_adjust_requested_cr(struct cdns_mhdp_device *mhdp,
u8 link_status[DP_LINK_STATUS_SIZE],
u8 *req_volt, u8 *req_pre)
{
const u8 max_volt = CDNS_VOLT_SWING(mhdp->host.volt_swing);
const u8 max_pre = CDNS_PRE_EMPHASIS(mhdp->host.pre_emphasis);
unsigned int i;
for (i = 0; i < mhdp->link.num_lanes; i++) {
u8 val;
val = mhdp->host.volt_swing & CDNS_FORCE_VOLT_SWING ?
max_volt : req_volt[i];
cdns_mhdp_set_adjust_request_voltage(link_status, i, val);
val = mhdp->host.pre_emphasis & CDNS_FORCE_PRE_EMPHASIS ?
max_pre : req_pre[i];
cdns_mhdp_set_adjust_request_pre_emphasis(link_status, i, val);
}
}
static
void cdns_mhdp_validate_cr(struct cdns_mhdp_device *mhdp, bool *cr_done,
bool *same_before_adjust, bool *max_swing_reached,
u8 before_cr[CDNS_DP_MAX_NUM_LANES],
u8 after_cr[DP_LINK_STATUS_SIZE], u8 *req_volt,
u8 *req_pre)
{
const u8 max_volt = CDNS_VOLT_SWING(mhdp->host.volt_swing);
const u8 max_pre = CDNS_PRE_EMPHASIS(mhdp->host.pre_emphasis);
bool same_pre, same_volt;
unsigned int i;
u8 adjust;
*same_before_adjust = false;
*max_swing_reached = false;
*cr_done = drm_dp_clock_recovery_ok(after_cr, mhdp->link.num_lanes);
for (i = 0; i < mhdp->link.num_lanes; i++) {
adjust = drm_dp_get_adjust_request_voltage(after_cr, i);
req_volt[i] = min(adjust, max_volt);
adjust = drm_dp_get_adjust_request_pre_emphasis(after_cr, i) >>
DP_TRAIN_PRE_EMPHASIS_SHIFT;
req_pre[i] = min(adjust, max_pre);
same_pre = (before_cr[i] & DP_TRAIN_PRE_EMPHASIS_MASK) ==
req_pre[i] << DP_TRAIN_PRE_EMPHASIS_SHIFT;
same_volt = (before_cr[i] & DP_TRAIN_VOLTAGE_SWING_MASK) ==
req_volt[i];
if (same_pre && same_volt)
*same_before_adjust = true;
/* 3.1.5.2 in DP Standard v1.4. Table 3-1 */
if (!*cr_done && req_volt[i] + req_pre[i] >= 3) {
*max_swing_reached = true;
return;
}
}
}
static bool cdns_mhdp_link_training_cr(struct cdns_mhdp_device *mhdp)
{
u8 lanes_data[CDNS_DP_MAX_NUM_LANES],
fail_counter_short = 0, fail_counter_cr_long = 0;
u8 link_status[DP_LINK_STATUS_SIZE];
bool cr_done;
union phy_configure_opts phy_cfg;
int ret;
dev_dbg(mhdp->dev, "Starting CR phase\n");
ret = cdns_mhdp_link_training_init(mhdp);
if (ret)
goto err;
drm_dp_dpcd_read_link_status(&mhdp->aux, link_status);
do {
u8 requested_adjust_volt_swing[CDNS_DP_MAX_NUM_LANES] = {};
u8 requested_adjust_pre_emphasis[CDNS_DP_MAX_NUM_LANES] = {};
bool same_before_adjust, max_swing_reached;
cdns_mhdp_get_adjust_train(mhdp, link_status, lanes_data,
&phy_cfg);
phy_cfg.dp.lanes = mhdp->link.num_lanes;
phy_cfg.dp.ssc = cdns_mhdp_get_ssc_supported(mhdp);
phy_cfg.dp.set_lanes = false;
phy_cfg.dp.set_rate = false;
phy_cfg.dp.set_voltages = true;
ret = phy_configure(mhdp->phy, &phy_cfg);
if (ret) {
dev_err(mhdp->dev, "%s: phy_configure() failed: %d\n",
__func__, ret);
goto err;
}
cdns_mhdp_adjust_lt(mhdp, mhdp->link.num_lanes, 100,
lanes_data, link_status);
cdns_mhdp_validate_cr(mhdp, &cr_done, &same_before_adjust,
&max_swing_reached, lanes_data,
link_status,
requested_adjust_volt_swing,
requested_adjust_pre_emphasis);
if (max_swing_reached) {
dev_err(mhdp->dev, "CR: max swing reached\n");
goto err;
}
if (cr_done) {
cdns_mhdp_print_lt_status("CR phase ok", mhdp,
&phy_cfg);
return true;
}
/* Not all CR_DONE bits set */
fail_counter_cr_long++;
if (same_before_adjust) {
fail_counter_short++;
continue;
}
fail_counter_short = 0;
/*
* Voltage swing/pre-emphasis adjust requested
* during CR phase
*/
cdns_mhdp_adjust_requested_cr(mhdp, link_status,
requested_adjust_volt_swing,
requested_adjust_pre_emphasis);
} while (fail_counter_short < 5 && fail_counter_cr_long < 10);
err:
cdns_mhdp_print_lt_status("CR phase failed", mhdp, &phy_cfg);
return false;
}
static void cdns_mhdp_lower_link_rate(struct cdns_mhdp_link *link)
{
switch (drm_dp_link_rate_to_bw_code(link->rate)) {
case DP_LINK_BW_2_7:
link->rate = drm_dp_bw_code_to_link_rate(DP_LINK_BW_1_62);
break;
case DP_LINK_BW_5_4:
link->rate = drm_dp_bw_code_to_link_rate(DP_LINK_BW_2_7);
break;
case DP_LINK_BW_8_1:
link->rate = drm_dp_bw_code_to_link_rate(DP_LINK_BW_5_4);
break;
}
}
static int cdns_mhdp_link_training(struct cdns_mhdp_device *mhdp,
unsigned int training_interval)
{
u32 reg32;
const u8 eq_tps = cdns_mhdp_eq_training_pattern_supported(mhdp);
int ret;
while (1) {
if (!cdns_mhdp_link_training_cr(mhdp)) {
if (drm_dp_link_rate_to_bw_code(mhdp->link.rate) !=
DP_LINK_BW_1_62) {
dev_dbg(mhdp->dev,
"Reducing link rate during CR phase\n");
cdns_mhdp_lower_link_rate(&mhdp->link);
continue;
} else if (mhdp->link.num_lanes > 1) {
dev_dbg(mhdp->dev,
"Reducing lanes number during CR phase\n");
mhdp->link.num_lanes >>= 1;
mhdp->link.rate = cdns_mhdp_max_link_rate(mhdp);
continue;
}
dev_err(mhdp->dev,
"Link training failed during CR phase\n");
goto err;
}
if (cdns_mhdp_link_training_channel_eq(mhdp, eq_tps,
training_interval))
break;
if (mhdp->link.num_lanes > 1) {
dev_dbg(mhdp->dev,
"Reducing lanes number during EQ phase\n");
mhdp->link.num_lanes >>= 1;
continue;
} else if (drm_dp_link_rate_to_bw_code(mhdp->link.rate) !=
DP_LINK_BW_1_62) {
dev_dbg(mhdp->dev,
"Reducing link rate during EQ phase\n");
cdns_mhdp_lower_link_rate(&mhdp->link);
mhdp->link.num_lanes = cdns_mhdp_max_num_lanes(mhdp);
continue;
}
dev_err(mhdp->dev, "Link training failed during EQ phase\n");
goto err;
}
dev_dbg(mhdp->dev, "Link training ok. Lanes: %u, Rate %u Mbps\n",
mhdp->link.num_lanes, mhdp->link.rate / 100);
drm_dp_dpcd_writeb(&mhdp->aux, DP_TRAINING_PATTERN_SET,
mhdp->host.scrambler ? 0 :
DP_LINK_SCRAMBLING_DISABLE);
ret = cdns_mhdp_reg_read(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, &reg32);
if (ret < 0) {
dev_err(mhdp->dev,
"Failed to read CDNS_DP_FRAMER_GLOBAL_CONFIG %d\n",
ret);
return ret;
}
reg32 &= ~GENMASK(1, 0);
reg32 |= CDNS_DP_NUM_LANES(mhdp->link.num_lanes);
reg32 |= CDNS_DP_WR_FAILING_EDGE_VSYNC;
reg32 |= CDNS_DP_FRAMER_EN;
cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, reg32);
/* Reset PHY config */
reg32 = CDNS_PHY_COMMON_CONFIG | CDNS_PHY_TRAINING_TYPE(1);
if (!mhdp->host.scrambler)
reg32 |= CDNS_PHY_SCRAMBLER_BYPASS;
cdns_mhdp_reg_write(mhdp, CDNS_DPTX_PHY_CONFIG, reg32);
return 0;
err:
/* Reset PHY config */
reg32 = CDNS_PHY_COMMON_CONFIG | CDNS_PHY_TRAINING_TYPE(1);
if (!mhdp->host.scrambler)
reg32 |= CDNS_PHY_SCRAMBLER_BYPASS;
cdns_mhdp_reg_write(mhdp, CDNS_DPTX_PHY_CONFIG, reg32);
drm_dp_dpcd_writeb(&mhdp->aux, DP_TRAINING_PATTERN_SET,
DP_TRAINING_PATTERN_DISABLE);
return -EIO;
}
static u32 cdns_mhdp_get_training_interval_us(struct cdns_mhdp_device *mhdp,
u32 interval)
{
if (interval == 0)
return 400;
if (interval < 5)
return 4000 << (interval - 1);
dev_err(mhdp->dev,
"wrong training interval returned by DPCD: %d\n", interval);
return 0;
}
static void cdns_mhdp_fill_host_caps(struct cdns_mhdp_device *mhdp)
{
unsigned int link_rate;
/* Get source capabilities based on PHY attributes */
mhdp->host.lanes_cnt = mhdp->phy->attrs.bus_width;
if (!mhdp->host.lanes_cnt)
mhdp->host.lanes_cnt = 4;
link_rate = mhdp->phy->attrs.max_link_rate;
if (!link_rate)
link_rate = drm_dp_bw_code_to_link_rate(DP_LINK_BW_8_1);
else
/* PHY uses Mb/s, DRM uses tens of kb/s. */
link_rate *= 100;
mhdp->host.link_rate = link_rate;
mhdp->host.volt_swing = CDNS_VOLT_SWING(3);
mhdp->host.pre_emphasis = CDNS_PRE_EMPHASIS(3);
mhdp->host.pattern_supp = CDNS_SUPPORT_TPS(1) |
CDNS_SUPPORT_TPS(2) | CDNS_SUPPORT_TPS(3) |
CDNS_SUPPORT_TPS(4);
mhdp->host.lane_mapping = CDNS_LANE_MAPPING_NORMAL;
mhdp->host.fast_link = false;
mhdp->host.enhanced = true;
mhdp->host.scrambler = true;
mhdp->host.ssc = false;
}
static void cdns_mhdp_fill_sink_caps(struct cdns_mhdp_device *mhdp,
u8 dpcd[DP_RECEIVER_CAP_SIZE])
{
mhdp->sink.link_rate = mhdp->link.rate;
mhdp->sink.lanes_cnt = mhdp->link.num_lanes;
mhdp->sink.enhanced = !!(mhdp->link.capabilities &
DP_LINK_CAP_ENHANCED_FRAMING);
/* Set SSC support */
mhdp->sink.ssc = !!(dpcd[DP_MAX_DOWNSPREAD] &
DP_MAX_DOWNSPREAD_0_5);
/* Set TPS support */
mhdp->sink.pattern_supp = CDNS_SUPPORT_TPS(1) | CDNS_SUPPORT_TPS(2);
if (drm_dp_tps3_supported(dpcd))
mhdp->sink.pattern_supp |= CDNS_SUPPORT_TPS(3);
if (drm_dp_tps4_supported(dpcd))
mhdp->sink.pattern_supp |= CDNS_SUPPORT_TPS(4);
/* Set fast link support */
mhdp->sink.fast_link = !!(dpcd[DP_MAX_DOWNSPREAD] &
DP_NO_AUX_HANDSHAKE_LINK_TRAINING);
}
static int cdns_mhdp_link_up(struct cdns_mhdp_device *mhdp)
{
u8 dpcd[DP_RECEIVER_CAP_SIZE], amp[2];
u32 resp, interval, interval_us;
u8 ext_cap_chk = 0;
unsigned int addr;
int err;
WARN_ON(!mutex_is_locked(&mhdp->link_mutex));
drm_dp_dpcd_readb(&mhdp->aux, DP_TRAINING_AUX_RD_INTERVAL,
&ext_cap_chk);
if (ext_cap_chk & DP_EXTENDED_RECEIVER_CAP_FIELD_PRESENT)
addr = DP_DP13_DPCD_REV;
else
addr = DP_DPCD_REV;
err = drm_dp_dpcd_read(&mhdp->aux, addr, dpcd, DP_RECEIVER_CAP_SIZE);
if (err < 0) {
dev_err(mhdp->dev, "Failed to read receiver capabilities\n");
return err;
}
mhdp->link.revision = dpcd[0];
mhdp->link.rate = drm_dp_bw_code_to_link_rate(dpcd[1]);
mhdp->link.num_lanes = dpcd[2] & DP_MAX_LANE_COUNT_MASK;
if (dpcd[2] & DP_ENHANCED_FRAME_CAP)
mhdp->link.capabilities |= DP_LINK_CAP_ENHANCED_FRAMING;
dev_dbg(mhdp->dev, "Set sink device power state via DPCD\n");
cdns_mhdp_link_power_up(&mhdp->aux, &mhdp->link);
cdns_mhdp_fill_sink_caps(mhdp, dpcd);
mhdp->link.rate = cdns_mhdp_max_link_rate(mhdp);
mhdp->link.num_lanes = cdns_mhdp_max_num_lanes(mhdp);
/* Disable framer for link training */
err = cdns_mhdp_reg_read(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, &resp);
if (err < 0) {
dev_err(mhdp->dev,
"Failed to read CDNS_DP_FRAMER_GLOBAL_CONFIG %d\n",
err);
return err;
}
resp &= ~CDNS_DP_FRAMER_EN;
cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, resp);
/* Spread AMP if required, enable 8b/10b coding */
amp[0] = cdns_mhdp_get_ssc_supported(mhdp) ? DP_SPREAD_AMP_0_5 : 0;
amp[1] = DP_SET_ANSI_8B10B;
drm_dp_dpcd_write(&mhdp->aux, DP_DOWNSPREAD_CTRL, amp, 2);
if (mhdp->host.fast_link & mhdp->sink.fast_link) {
dev_err(mhdp->dev, "fastlink not supported\n");
return -EOPNOTSUPP;
}
interval = dpcd[DP_TRAINING_AUX_RD_INTERVAL] & DP_TRAINING_AUX_RD_MASK;
interval_us = cdns_mhdp_get_training_interval_us(mhdp, interval);
if (!interval_us ||
cdns_mhdp_link_training(mhdp, interval_us)) {
dev_err(mhdp->dev, "Link training failed. Exiting.\n");
return -EIO;
}
mhdp->link_up = true;
return 0;
}
static void cdns_mhdp_link_down(struct cdns_mhdp_device *mhdp)
{
WARN_ON(!mutex_is_locked(&mhdp->link_mutex));
if (mhdp->plugged)
cdns_mhdp_link_power_down(&mhdp->aux, &mhdp->link);
mhdp->link_up = false;
}
static struct edid *cdns_mhdp_get_edid(struct cdns_mhdp_device *mhdp,
struct drm_connector *connector)
{
if (!mhdp->plugged)
return NULL;
return drm_do_get_edid(connector, cdns_mhdp_get_edid_block, mhdp);
}
static int cdns_mhdp_get_modes(struct drm_connector *connector)
{
struct cdns_mhdp_device *mhdp = connector_to_mhdp(connector);
struct edid *edid;
int num_modes;
if (!mhdp->plugged)
return 0;
edid = cdns_mhdp_get_edid(mhdp, connector);
if (!edid) {
dev_err(mhdp->dev, "Failed to read EDID\n");
return 0;
}
drm_connector_update_edid_property(connector, edid);
num_modes = drm_add_edid_modes(connector, edid);
kfree(edid);
/*
* HACK: Warn about unsupported display formats until we deal
* with them correctly.
*/
if (connector->display_info.color_formats &&
!(connector->display_info.color_formats &
mhdp->display_fmt.color_format))
dev_warn(mhdp->dev,
"%s: No supported color_format found (0x%08x)\n",
__func__, connector->display_info.color_formats);
if (connector->display_info.bpc &&
connector->display_info.bpc < mhdp->display_fmt.bpc)
dev_warn(mhdp->dev, "%s: Display bpc only %d < %d\n",
__func__, connector->display_info.bpc,
mhdp->display_fmt.bpc);
return num_modes;
}
static int cdns_mhdp_connector_detect(struct drm_connector *conn,
struct drm_modeset_acquire_ctx *ctx,
bool force)
{
struct cdns_mhdp_device *mhdp = connector_to_mhdp(conn);
return cdns_mhdp_detect(mhdp);
}
static u32 cdns_mhdp_get_bpp(struct cdns_mhdp_display_fmt *fmt)
{
u32 bpp;
if (fmt->y_only)
return fmt->bpc;
switch (fmt->color_format) {
case DRM_COLOR_FORMAT_RGB444:
case DRM_COLOR_FORMAT_YCBCR444:
bpp = fmt->bpc * 3;
break;
case DRM_COLOR_FORMAT_YCBCR422:
bpp = fmt->bpc * 2;
break;
case DRM_COLOR_FORMAT_YCBCR420:
bpp = fmt->bpc * 3 / 2;
break;
default:
bpp = fmt->bpc * 3;
WARN_ON(1);
}
return bpp;
}
static
bool cdns_mhdp_bandwidth_ok(struct cdns_mhdp_device *mhdp,
const struct drm_display_mode *mode,
unsigned int lanes, unsigned int rate)
{
u32 max_bw, req_bw, bpp;
/*
* mode->clock is expressed in kHz. Multiplying by bpp and dividing by 8
* we get the number of kB/s. DisplayPort applies a 8b-10b encoding, the
* value thus equals the bandwidth in 10kb/s units, which matches the
* units of the rate parameter.
*/
bpp = cdns_mhdp_get_bpp(&mhdp->display_fmt);
req_bw = mode->clock * bpp / 8;
max_bw = lanes * rate;
if (req_bw > max_bw) {
dev_dbg(mhdp->dev,
"Unsupported Mode: %s, Req BW: %u, Available Max BW:%u\n",
mode->name, req_bw, max_bw);
return false;
}
return true;
}
static
enum drm_mode_status cdns_mhdp_mode_valid(struct drm_connector *conn,
struct drm_display_mode *mode)
{
struct cdns_mhdp_device *mhdp = connector_to_mhdp(conn);
mutex_lock(&mhdp->link_mutex);
if (!cdns_mhdp_bandwidth_ok(mhdp, mode, mhdp->link.num_lanes,
mhdp->link.rate)) {
mutex_unlock(&mhdp->link_mutex);
return MODE_CLOCK_HIGH;
}
mutex_unlock(&mhdp->link_mutex);
return MODE_OK;
}
static int cdns_mhdp_connector_atomic_check(struct drm_connector *conn,
struct drm_atomic_state *state)
{
struct cdns_mhdp_device *mhdp = connector_to_mhdp(conn);
struct drm_connector_state *old_state, *new_state;
struct drm_crtc_state *crtc_state;
u64 old_cp, new_cp;
if (!mhdp->hdcp_supported)
return 0;
old_state = drm_atomic_get_old_connector_state(state, conn);
new_state = drm_atomic_get_new_connector_state(state, conn);
old_cp = old_state->content_protection;
new_cp = new_state->content_protection;
if (old_state->hdcp_content_type != new_state->hdcp_content_type &&
new_cp != DRM_MODE_CONTENT_PROTECTION_UNDESIRED) {
new_state->content_protection = DRM_MODE_CONTENT_PROTECTION_DESIRED;
goto mode_changed;
}
if (!new_state->crtc) {
if (old_cp == DRM_MODE_CONTENT_PROTECTION_ENABLED)
new_state->content_protection = DRM_MODE_CONTENT_PROTECTION_DESIRED;
return 0;
}
if (old_cp == new_cp ||
(old_cp == DRM_MODE_CONTENT_PROTECTION_DESIRED &&
new_cp == DRM_MODE_CONTENT_PROTECTION_ENABLED))
return 0;
mode_changed:
crtc_state = drm_atomic_get_new_crtc_state(state, new_state->crtc);
crtc_state->mode_changed = true;
return 0;
}
static const struct drm_connector_helper_funcs cdns_mhdp_conn_helper_funcs = {
.detect_ctx = cdns_mhdp_connector_detect,
.get_modes = cdns_mhdp_get_modes,
.mode_valid = cdns_mhdp_mode_valid,
.atomic_check = cdns_mhdp_connector_atomic_check,
};
static const struct drm_connector_funcs cdns_mhdp_conn_funcs = {
.fill_modes = drm_helper_probe_single_connector_modes,
.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
.reset = drm_atomic_helper_connector_reset,
.destroy = drm_connector_cleanup,
};
static int cdns_mhdp_connector_init(struct cdns_mhdp_device *mhdp)
{
u32 bus_format = MEDIA_BUS_FMT_RGB121212_1X36;
struct drm_connector *conn = &mhdp->connector;
struct drm_bridge *bridge = &mhdp->bridge;
int ret;
if (!bridge->encoder) {
dev_err(mhdp->dev, "Parent encoder object not found");
return -ENODEV;
}
conn->polled = DRM_CONNECTOR_POLL_HPD;
ret = drm_connector_init(bridge->dev, conn, &cdns_mhdp_conn_funcs,
DRM_MODE_CONNECTOR_DisplayPort);
if (ret) {
dev_err(mhdp->dev, "Failed to initialize connector with drm\n");
return ret;
}
drm_connector_helper_add(conn, &cdns_mhdp_conn_helper_funcs);
ret = drm_display_info_set_bus_formats(&conn->display_info,
&bus_format, 1);
if (ret)
return ret;
ret = drm_connector_attach_encoder(conn, bridge->encoder);
if (ret) {
dev_err(mhdp->dev, "Failed to attach connector to encoder\n");
return ret;
}
if (mhdp->hdcp_supported)
ret = drm_connector_attach_content_protection_property(conn, true);
return ret;
}
static int cdns_mhdp_attach(struct drm_bridge *bridge,
enum drm_bridge_attach_flags flags)
{
struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge);
bool hw_ready;
int ret;
dev_dbg(mhdp->dev, "%s\n", __func__);
mhdp->aux.drm_dev = bridge->dev;
ret = drm_dp_aux_register(&mhdp->aux);
if (ret < 0)
return ret;
if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
ret = cdns_mhdp_connector_init(mhdp);
if (ret)
goto aux_unregister;
}
spin_lock(&mhdp->start_lock);
mhdp->bridge_attached = true;
hw_ready = mhdp->hw_state == MHDP_HW_READY;
spin_unlock(&mhdp->start_lock);
/* Enable SW event interrupts */
if (hw_ready)
writel(~(u32)CDNS_APB_INT_MASK_SW_EVENT_INT,
mhdp->regs + CDNS_APB_INT_MASK);
return 0;
aux_unregister:
drm_dp_aux_unregister(&mhdp->aux);
return ret;
}
static void cdns_mhdp_configure_video(struct cdns_mhdp_device *mhdp,
const struct drm_display_mode *mode)
{
unsigned int dp_framer_sp = 0, msa_horizontal_1,
msa_vertical_1, bnd_hsync2vsync, hsync2vsync_pol_ctrl,
misc0 = 0, misc1 = 0, pxl_repr,
front_porch, back_porch, msa_h0, msa_v0, hsync, vsync,
dp_vertical_1;
u8 stream_id = mhdp->stream_id;
u32 bpp, bpc, pxlfmt, framer;
int ret;
pxlfmt = mhdp->display_fmt.color_format;
bpc = mhdp->display_fmt.bpc;
/*
* If YCBCR supported and stream not SD, use ITU709
* Need to handle ITU version with YCBCR420 when supported
*/
if ((pxlfmt == DRM_COLOR_FORMAT_YCBCR444 ||
pxlfmt == DRM_COLOR_FORMAT_YCBCR422) && mode->crtc_vdisplay >= 720)
misc0 = DP_YCBCR_COEFFICIENTS_ITU709;
bpp = cdns_mhdp_get_bpp(&mhdp->display_fmt);
switch (pxlfmt) {
case DRM_COLOR_FORMAT_RGB444:
pxl_repr = CDNS_DP_FRAMER_RGB << CDNS_DP_FRAMER_PXL_FORMAT;
misc0 |= DP_COLOR_FORMAT_RGB;
break;
case DRM_COLOR_FORMAT_YCBCR444:
pxl_repr = CDNS_DP_FRAMER_YCBCR444 << CDNS_DP_FRAMER_PXL_FORMAT;
misc0 |= DP_COLOR_FORMAT_YCbCr444 | DP_TEST_DYNAMIC_RANGE_CEA;
break;
case DRM_COLOR_FORMAT_YCBCR422:
pxl_repr = CDNS_DP_FRAMER_YCBCR422 << CDNS_DP_FRAMER_PXL_FORMAT;
misc0 |= DP_COLOR_FORMAT_YCbCr422 | DP_TEST_DYNAMIC_RANGE_CEA;
break;
case DRM_COLOR_FORMAT_YCBCR420:
pxl_repr = CDNS_DP_FRAMER_YCBCR420 << CDNS_DP_FRAMER_PXL_FORMAT;
break;
default:
pxl_repr = CDNS_DP_FRAMER_Y_ONLY << CDNS_DP_FRAMER_PXL_FORMAT;
}
switch (bpc) {
case 6:
misc0 |= DP_TEST_BIT_DEPTH_6;
pxl_repr |= CDNS_DP_FRAMER_6_BPC;
break;
case 8:
misc0 |= DP_TEST_BIT_DEPTH_8;
pxl_repr |= CDNS_DP_FRAMER_8_BPC;
break;
case 10:
misc0 |= DP_TEST_BIT_DEPTH_10;
pxl_repr |= CDNS_DP_FRAMER_10_BPC;
break;
case 12:
misc0 |= DP_TEST_BIT_DEPTH_12;
pxl_repr |= CDNS_DP_FRAMER_12_BPC;
break;
case 16:
misc0 |= DP_TEST_BIT_DEPTH_16;
pxl_repr |= CDNS_DP_FRAMER_16_BPC;
break;
}
bnd_hsync2vsync = CDNS_IP_BYPASS_V_INTERFACE;
if (mode->flags & DRM_MODE_FLAG_INTERLACE)
bnd_hsync2vsync |= CDNS_IP_DET_INTERLACE_FORMAT;
cdns_mhdp_reg_write(mhdp, CDNS_BND_HSYNC2VSYNC(stream_id),
bnd_hsync2vsync);
hsync2vsync_pol_ctrl = 0;
if (mode->flags & DRM_MODE_FLAG_NHSYNC)
hsync2vsync_pol_ctrl |= CDNS_H2V_HSYNC_POL_ACTIVE_LOW;
if (mode->flags & DRM_MODE_FLAG_NVSYNC)
hsync2vsync_pol_ctrl |= CDNS_H2V_VSYNC_POL_ACTIVE_LOW;
cdns_mhdp_reg_write(mhdp, CDNS_HSYNC2VSYNC_POL_CTRL(stream_id),
hsync2vsync_pol_ctrl);
cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_PXL_REPR(stream_id), pxl_repr);
if (mode->flags & DRM_MODE_FLAG_INTERLACE)
dp_framer_sp |= CDNS_DP_FRAMER_INTERLACE;
if (mode->flags & DRM_MODE_FLAG_NHSYNC)
dp_framer_sp |= CDNS_DP_FRAMER_HSYNC_POL_LOW;
if (mode->flags & DRM_MODE_FLAG_NVSYNC)
dp_framer_sp |= CDNS_DP_FRAMER_VSYNC_POL_LOW;
cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_SP(stream_id), dp_framer_sp);
front_porch = mode->crtc_hsync_start - mode->crtc_hdisplay;
back_porch = mode->crtc_htotal - mode->crtc_hsync_end;
cdns_mhdp_reg_write(mhdp, CDNS_DP_FRONT_BACK_PORCH(stream_id),
CDNS_DP_FRONT_PORCH(front_porch) |
CDNS_DP_BACK_PORCH(back_porch));
cdns_mhdp_reg_write(mhdp, CDNS_DP_BYTE_COUNT(stream_id),
mode->crtc_hdisplay * bpp / 8);
msa_h0 = mode->crtc_htotal - mode->crtc_hsync_start;
cdns_mhdp_reg_write(mhdp, CDNS_DP_MSA_HORIZONTAL_0(stream_id),
CDNS_DP_MSAH0_H_TOTAL(mode->crtc_htotal) |
CDNS_DP_MSAH0_HSYNC_START(msa_h0));
hsync = mode->crtc_hsync_end - mode->crtc_hsync_start;
msa_horizontal_1 = CDNS_DP_MSAH1_HSYNC_WIDTH(hsync) |
CDNS_DP_MSAH1_HDISP_WIDTH(mode->crtc_hdisplay);
if (mode->flags & DRM_MODE_FLAG_NHSYNC)
msa_horizontal_1 |= CDNS_DP_MSAH1_HSYNC_POL_LOW;
cdns_mhdp_reg_write(mhdp, CDNS_DP_MSA_HORIZONTAL_1(stream_id),
msa_horizontal_1);
msa_v0 = mode->crtc_vtotal - mode->crtc_vsync_start;
cdns_mhdp_reg_write(mhdp, CDNS_DP_MSA_VERTICAL_0(stream_id),
CDNS_DP_MSAV0_V_TOTAL(mode->crtc_vtotal) |
CDNS_DP_MSAV0_VSYNC_START(msa_v0));
vsync = mode->crtc_vsync_end - mode->crtc_vsync_start;
msa_vertical_1 = CDNS_DP_MSAV1_VSYNC_WIDTH(vsync) |
CDNS_DP_MSAV1_VDISP_WIDTH(mode->crtc_vdisplay);
if (mode->flags & DRM_MODE_FLAG_NVSYNC)
msa_vertical_1 |= CDNS_DP_MSAV1_VSYNC_POL_LOW;
cdns_mhdp_reg_write(mhdp, CDNS_DP_MSA_VERTICAL_1(stream_id),
msa_vertical_1);
if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
mode->crtc_vtotal % 2 == 0)
misc1 = DP_TEST_INTERLACED;
if (mhdp->display_fmt.y_only)
misc1 |= CDNS_DP_TEST_COLOR_FORMAT_RAW_Y_ONLY;
/* Use VSC SDP for Y420 */
if (pxlfmt == DRM_COLOR_FORMAT_YCBCR420)
misc1 = CDNS_DP_TEST_VSC_SDP;
cdns_mhdp_reg_write(mhdp, CDNS_DP_MSA_MISC(stream_id),
misc0 | (misc1 << 8));
cdns_mhdp_reg_write(mhdp, CDNS_DP_HORIZONTAL(stream_id),
CDNS_DP_H_HSYNC_WIDTH(hsync) |
CDNS_DP_H_H_TOTAL(mode->crtc_hdisplay));
cdns_mhdp_reg_write(mhdp, CDNS_DP_VERTICAL_0(stream_id),
CDNS_DP_V0_VHEIGHT(mode->crtc_vdisplay) |
CDNS_DP_V0_VSTART(msa_v0));
dp_vertical_1 = CDNS_DP_V1_VTOTAL(mode->crtc_vtotal);
if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
mode->crtc_vtotal % 2 == 0)
dp_vertical_1 |= CDNS_DP_V1_VTOTAL_EVEN;
cdns_mhdp_reg_write(mhdp, CDNS_DP_VERTICAL_1(stream_id), dp_vertical_1);
cdns_mhdp_reg_write_bit(mhdp, CDNS_DP_VB_ID(stream_id), 2, 1,
(mode->flags & DRM_MODE_FLAG_INTERLACE) ?
CDNS_DP_VB_ID_INTERLACED : 0);
ret = cdns_mhdp_reg_read(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, &framer);
if (ret < 0) {
dev_err(mhdp->dev,
"Failed to read CDNS_DP_FRAMER_GLOBAL_CONFIG %d\n",
ret);
return;
}
framer |= CDNS_DP_FRAMER_EN;
framer &= ~CDNS_DP_NO_VIDEO_MODE;
cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, framer);
}
static void cdns_mhdp_sst_enable(struct cdns_mhdp_device *mhdp,
const struct drm_display_mode *mode)
{
u32 rate, vs, required_bandwidth, available_bandwidth;
s32 line_thresh1, line_thresh2, line_thresh = 0;
int pxlclock = mode->crtc_clock;
u32 tu_size = 64;
u32 bpp;
/* Get rate in MSymbols per second per lane */
rate = mhdp->link.rate / 1000;
bpp = cdns_mhdp_get_bpp(&mhdp->display_fmt);
required_bandwidth = pxlclock * bpp / 8;
available_bandwidth = mhdp->link.num_lanes * rate;
vs = tu_size * required_bandwidth / available_bandwidth;
vs /= 1000;
if (vs == tu_size)
vs = tu_size - 1;
line_thresh1 = ((vs + 1) << 5) * 8 / bpp;
line_thresh2 = (pxlclock << 5) / 1000 / rate * (vs + 1) - (1 << 5);
line_thresh = line_thresh1 - line_thresh2 / (s32)mhdp->link.num_lanes;
line_thresh = (line_thresh >> 5) + 2;
mhdp->stream_id = 0;
cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_TU,
CDNS_DP_FRAMER_TU_VS(vs) |
CDNS_DP_FRAMER_TU_SIZE(tu_size) |
CDNS_DP_FRAMER_TU_CNT_RST_EN);
cdns_mhdp_reg_write(mhdp, CDNS_DP_LINE_THRESH(0),
line_thresh & GENMASK(5, 0));
cdns_mhdp_reg_write(mhdp, CDNS_DP_STREAM_CONFIG_2(0),
CDNS_DP_SC2_TU_VS_DIFF((tu_size - vs > 3) ?
0 : tu_size - vs));
cdns_mhdp_configure_video(mhdp, mode);
}
static void cdns_mhdp_atomic_enable(struct drm_bridge *bridge,
struct drm_bridge_state *bridge_state)
{
struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge);
struct drm_atomic_state *state = bridge_state->base.state;
struct cdns_mhdp_bridge_state *mhdp_state;
struct drm_crtc_state *crtc_state;
struct drm_connector *connector;
struct drm_connector_state *conn_state;
struct drm_bridge_state *new_state;
const struct drm_display_mode *mode;
u32 resp;
int ret;
dev_dbg(mhdp->dev, "bridge enable\n");
mutex_lock(&mhdp->link_mutex);
if (mhdp->plugged && !mhdp->link_up) {
ret = cdns_mhdp_link_up(mhdp);
if (ret < 0)
goto out;
}
if (mhdp->info && mhdp->info->ops && mhdp->info->ops->enable)
mhdp->info->ops->enable(mhdp);
/* Enable VIF clock for stream 0 */
ret = cdns_mhdp_reg_read(mhdp, CDNS_DPTX_CAR, &resp);
if (ret < 0) {
dev_err(mhdp->dev, "Failed to read CDNS_DPTX_CAR %d\n", ret);
goto out;
}
cdns_mhdp_reg_write(mhdp, CDNS_DPTX_CAR,
resp | CDNS_VIF_CLK_EN | CDNS_VIF_CLK_RSTN);
connector = drm_atomic_get_new_connector_for_encoder(state,
bridge->encoder);
if (WARN_ON(!connector))
goto out;
conn_state = drm_atomic_get_new_connector_state(state, connector);
if (WARN_ON(!conn_state))
goto out;
if (mhdp->hdcp_supported &&
mhdp->hw_state == MHDP_HW_READY &&
conn_state->content_protection ==
DRM_MODE_CONTENT_PROTECTION_DESIRED) {
mutex_unlock(&mhdp->link_mutex);
cdns_mhdp_hdcp_enable(mhdp, conn_state->hdcp_content_type);
mutex_lock(&mhdp->link_mutex);
}
crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
if (WARN_ON(!crtc_state))
goto out;
mode = &crtc_state->adjusted_mode;
new_state = drm_atomic_get_new_bridge_state(state, bridge);
if (WARN_ON(!new_state))
goto out;
if (!cdns_mhdp_bandwidth_ok(mhdp, mode, mhdp->link.num_lanes,
mhdp->link.rate)) {
ret = -EINVAL;
goto out;
}
cdns_mhdp_sst_enable(mhdp, mode);
mhdp_state = to_cdns_mhdp_bridge_state(new_state);
mhdp_state->current_mode = drm_mode_duplicate(bridge->dev, mode);
drm_mode_set_name(mhdp_state->current_mode);
dev_dbg(mhdp->dev, "%s: Enabling mode %s\n", __func__, mode->name);
mhdp->bridge_enabled = true;
out:
mutex_unlock(&mhdp->link_mutex);
if (ret < 0)
schedule_work(&mhdp->modeset_retry_work);
}
static void cdns_mhdp_atomic_disable(struct drm_bridge *bridge,
struct drm_bridge_state *bridge_state)
{
struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge);
u32 resp;
dev_dbg(mhdp->dev, "%s\n", __func__);
mutex_lock(&mhdp->link_mutex);
if (mhdp->hdcp_supported)
cdns_mhdp_hdcp_disable(mhdp);
mhdp->bridge_enabled = false;
cdns_mhdp_reg_read(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, &resp);
resp &= ~CDNS_DP_FRAMER_EN;
resp |= CDNS_DP_NO_VIDEO_MODE;
cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, resp);
cdns_mhdp_link_down(mhdp);
/* Disable VIF clock for stream 0 */
cdns_mhdp_reg_read(mhdp, CDNS_DPTX_CAR, &resp);
cdns_mhdp_reg_write(mhdp, CDNS_DPTX_CAR,
resp & ~(CDNS_VIF_CLK_EN | CDNS_VIF_CLK_RSTN));
if (mhdp->info && mhdp->info->ops && mhdp->info->ops->disable)
mhdp->info->ops->disable(mhdp);
mutex_unlock(&mhdp->link_mutex);
}
static void cdns_mhdp_detach(struct drm_bridge *bridge)
{
struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge);
dev_dbg(mhdp->dev, "%s\n", __func__);
drm_dp_aux_unregister(&mhdp->aux);
spin_lock(&mhdp->start_lock);
mhdp->bridge_attached = false;
spin_unlock(&mhdp->start_lock);
writel(~0, mhdp->regs + CDNS_APB_INT_MASK);
}
static struct drm_bridge_state *
cdns_mhdp_bridge_atomic_duplicate_state(struct drm_bridge *bridge)
{
struct cdns_mhdp_bridge_state *state;
state = kzalloc(sizeof(*state), GFP_KERNEL);
if (!state)
return NULL;
__drm_atomic_helper_bridge_duplicate_state(bridge, &state->base);
return &state->base;
}
static void
cdns_mhdp_bridge_atomic_destroy_state(struct drm_bridge *bridge,
struct drm_bridge_state *state)
{
struct cdns_mhdp_bridge_state *cdns_mhdp_state;
cdns_mhdp_state = to_cdns_mhdp_bridge_state(state);
if (cdns_mhdp_state->current_mode) {
drm_mode_destroy(bridge->dev, cdns_mhdp_state->current_mode);
cdns_mhdp_state->current_mode = NULL;
}
kfree(cdns_mhdp_state);
}
static struct drm_bridge_state *
cdns_mhdp_bridge_atomic_reset(struct drm_bridge *bridge)
{
struct cdns_mhdp_bridge_state *cdns_mhdp_state;
cdns_mhdp_state = kzalloc(sizeof(*cdns_mhdp_state), GFP_KERNEL);
if (!cdns_mhdp_state)
return NULL;
__drm_atomic_helper_bridge_reset(bridge, &cdns_mhdp_state->base);
return &cdns_mhdp_state->base;
}
static int cdns_mhdp_atomic_check(struct drm_bridge *bridge,
struct drm_bridge_state *bridge_state,
struct drm_crtc_state *crtc_state,
struct drm_connector_state *conn_state)
{
struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge);
const struct drm_display_mode *mode = &crtc_state->adjusted_mode;
mutex_lock(&mhdp->link_mutex);
if (!cdns_mhdp_bandwidth_ok(mhdp, mode, mhdp->link.num_lanes,
mhdp->link.rate)) {
dev_err(mhdp->dev, "%s: Not enough BW for %s (%u lanes at %u Mbps)\n",
__func__, mode->name, mhdp->link.num_lanes,
mhdp->link.rate / 100);
mutex_unlock(&mhdp->link_mutex);
return -EINVAL;
}
mutex_unlock(&mhdp->link_mutex);
return 0;
}
static enum drm_connector_status cdns_mhdp_bridge_detect(struct drm_bridge *bridge)
{
struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge);
return cdns_mhdp_detect(mhdp);
}
static struct edid *cdns_mhdp_bridge_get_edid(struct drm_bridge *bridge,
struct drm_connector *connector)
{
struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge);
return cdns_mhdp_get_edid(mhdp, connector);
}
static void cdns_mhdp_bridge_hpd_enable(struct drm_bridge *bridge)
{
struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge);
/* Enable SW event interrupts */
if (mhdp->bridge_attached)
writel(~(u32)CDNS_APB_INT_MASK_SW_EVENT_INT,
mhdp->regs + CDNS_APB_INT_MASK);
}
static void cdns_mhdp_bridge_hpd_disable(struct drm_bridge *bridge)
{
struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge);
writel(CDNS_APB_INT_MASK_SW_EVENT_INT, mhdp->regs + CDNS_APB_INT_MASK);
}
static const struct drm_bridge_funcs cdns_mhdp_bridge_funcs = {
.atomic_enable = cdns_mhdp_atomic_enable,
.atomic_disable = cdns_mhdp_atomic_disable,
.atomic_check = cdns_mhdp_atomic_check,
.attach = cdns_mhdp_attach,
.detach = cdns_mhdp_detach,
.atomic_duplicate_state = cdns_mhdp_bridge_atomic_duplicate_state,
.atomic_destroy_state = cdns_mhdp_bridge_atomic_destroy_state,
.atomic_reset = cdns_mhdp_bridge_atomic_reset,
.detect = cdns_mhdp_bridge_detect,
.get_edid = cdns_mhdp_bridge_get_edid,
.hpd_enable = cdns_mhdp_bridge_hpd_enable,
.hpd_disable = cdns_mhdp_bridge_hpd_disable,
};
static bool cdns_mhdp_detect_hpd(struct cdns_mhdp_device *mhdp, bool *hpd_pulse)
{
int hpd_event, hpd_status;
*hpd_pulse = false;
hpd_event = cdns_mhdp_read_hpd_event(mhdp);
/* Getting event bits failed, bail out */
if (hpd_event < 0) {
dev_warn(mhdp->dev, "%s: read event failed: %d\n",
__func__, hpd_event);
return false;
}
hpd_status = cdns_mhdp_get_hpd_status(mhdp);
if (hpd_status < 0) {
dev_warn(mhdp->dev, "%s: get hpd status failed: %d\n",
__func__, hpd_status);
return false;
}
if (hpd_event & DPTX_READ_EVENT_HPD_PULSE)
*hpd_pulse = true;
return !!hpd_status;
}
static int cdns_mhdp_update_link_status(struct cdns_mhdp_device *mhdp)
{
struct cdns_mhdp_bridge_state *cdns_bridge_state;
struct drm_display_mode *current_mode;
bool old_plugged = mhdp->plugged;
struct drm_bridge_state *state;
u8 status[DP_LINK_STATUS_SIZE];
bool hpd_pulse;
int ret = 0;
mutex_lock(&mhdp->link_mutex);
mhdp->plugged = cdns_mhdp_detect_hpd(mhdp, &hpd_pulse);
if (!mhdp->plugged) {
cdns_mhdp_link_down(mhdp);
mhdp->link.rate = mhdp->host.link_rate;
mhdp->link.num_lanes = mhdp->host.lanes_cnt;
goto out;
}
/*
* If we get a HPD pulse event and we were and still are connected,
* check the link status. If link status is ok, there's nothing to do
* as we don't handle DP interrupts. If link status is bad, continue
* with full link setup.
*/
if (hpd_pulse && old_plugged == mhdp->plugged) {
ret = drm_dp_dpcd_read_link_status(&mhdp->aux, status);
/*
* If everything looks fine, just return, as we don't handle
* DP IRQs.
*/
if (ret > 0 &&
drm_dp_channel_eq_ok(status, mhdp->link.num_lanes) &&
drm_dp_clock_recovery_ok(status, mhdp->link.num_lanes))
goto out;
/* If link is bad, mark link as down so that we do a new LT */
mhdp->link_up = false;
}
if (!mhdp->link_up) {
ret = cdns_mhdp_link_up(mhdp);
if (ret < 0)
goto out;
}
if (mhdp->bridge_enabled) {
state = drm_priv_to_bridge_state(mhdp->bridge.base.state);
if (!state) {
ret = -EINVAL;
goto out;
}
cdns_bridge_state = to_cdns_mhdp_bridge_state(state);
if (!cdns_bridge_state) {
ret = -EINVAL;
goto out;
}
current_mode = cdns_bridge_state->current_mode;
if (!current_mode) {
ret = -EINVAL;
goto out;
}
if (!cdns_mhdp_bandwidth_ok(mhdp, current_mode, mhdp->link.num_lanes,
mhdp->link.rate)) {
ret = -EINVAL;
goto out;
}
dev_dbg(mhdp->dev, "%s: Enabling mode %s\n", __func__,
current_mode->name);
cdns_mhdp_sst_enable(mhdp, current_mode);
}
out:
mutex_unlock(&mhdp->link_mutex);
return ret;
}
static void cdns_mhdp_modeset_retry_fn(struct work_struct *work)
{
struct cdns_mhdp_device *mhdp;
struct drm_connector *conn;
mhdp = container_of(work, typeof(*mhdp), modeset_retry_work);
conn = &mhdp->connector;
/* Grab the locks before changing connector property */
mutex_lock(&conn->dev->mode_config.mutex);
/*
* Set connector link status to BAD and send a Uevent to notify
* userspace to do a modeset.
*/
drm_connector_set_link_status_property(conn, DRM_MODE_LINK_STATUS_BAD);
mutex_unlock(&conn->dev->mode_config.mutex);
/* Send Hotplug uevent so userspace can reprobe */
drm_kms_helper_hotplug_event(mhdp->bridge.dev);
}
static irqreturn_t cdns_mhdp_irq_handler(int irq, void *data)
{
struct cdns_mhdp_device *mhdp = data;
u32 apb_stat, sw_ev0;
bool bridge_attached;
apb_stat = readl(mhdp->regs + CDNS_APB_INT_STATUS);
if (!(apb_stat & CDNS_APB_INT_MASK_SW_EVENT_INT))
return IRQ_NONE;
sw_ev0 = readl(mhdp->regs + CDNS_SW_EVENT0);
/*
* Calling drm_kms_helper_hotplug_event() when not attached
* to drm device causes an oops because the drm_bridge->dev
* is NULL. See cdns_mhdp_fw_cb() comments for details about the
* problems related drm_kms_helper_hotplug_event() call.
*/
spin_lock(&mhdp->start_lock);
bridge_attached = mhdp->bridge_attached;
spin_unlock(&mhdp->start_lock);
if (bridge_attached && (sw_ev0 & CDNS_DPTX_HPD)) {
schedule_work(&mhdp->hpd_work);
}
if (sw_ev0 & ~CDNS_DPTX_HPD) {
mhdp->sw_events |= (sw_ev0 & ~CDNS_DPTX_HPD);
wake_up(&mhdp->sw_events_wq);
}
return IRQ_HANDLED;
}
u32 cdns_mhdp_wait_for_sw_event(struct cdns_mhdp_device *mhdp, u32 event)
{
u32 ret;
ret = wait_event_timeout(mhdp->sw_events_wq,
mhdp->sw_events & event,
msecs_to_jiffies(500));
if (!ret) {
dev_dbg(mhdp->dev, "SW event 0x%x timeout\n", event);
goto sw_event_out;
}
ret = mhdp->sw_events;
mhdp->sw_events &= ~event;
sw_event_out:
return ret;
}
static void cdns_mhdp_hpd_work(struct work_struct *work)
{
struct cdns_mhdp_device *mhdp = container_of(work,
struct cdns_mhdp_device,
hpd_work);
int ret;
ret = cdns_mhdp_update_link_status(mhdp);
if (mhdp->connector.dev) {
if (ret < 0)
schedule_work(&mhdp->modeset_retry_work);
else
drm_kms_helper_hotplug_event(mhdp->bridge.dev);
} else {
drm_bridge_hpd_notify(&mhdp->bridge, cdns_mhdp_detect(mhdp));
}
}
static int cdns_mhdp_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct cdns_mhdp_device *mhdp;
unsigned long rate;
struct clk *clk;
int ret;
int irq;
mhdp = devm_kzalloc(dev, sizeof(*mhdp), GFP_KERNEL);
if (!mhdp)
return -ENOMEM;
clk = devm_clk_get(dev, NULL);
if (IS_ERR(clk)) {
dev_err(dev, "couldn't get clk: %ld\n", PTR_ERR(clk));
return PTR_ERR(clk);
}
mhdp->clk = clk;
mhdp->dev = dev;
mutex_init(&mhdp->mbox_mutex);
mutex_init(&mhdp->link_mutex);
spin_lock_init(&mhdp->start_lock);
drm_dp_aux_init(&mhdp->aux);
mhdp->aux.dev = dev;
mhdp->aux.transfer = cdns_mhdp_transfer;
mhdp->regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(mhdp->regs)) {
dev_err(dev, "Failed to get memory resource\n");
return PTR_ERR(mhdp->regs);
}
mhdp->sapb_regs = devm_platform_ioremap_resource_byname(pdev, "mhdptx-sapb");
if (IS_ERR(mhdp->sapb_regs)) {
mhdp->hdcp_supported = false;
dev_warn(dev,
"Failed to get SAPB memory resource, HDCP not supported\n");
} else {
mhdp->hdcp_supported = true;
}
mhdp->phy = devm_of_phy_get_by_index(dev, pdev->dev.of_node, 0);
if (IS_ERR(mhdp->phy)) {
dev_err(dev, "no PHY configured\n");
return PTR_ERR(mhdp->phy);
}
platform_set_drvdata(pdev, mhdp);
mhdp->info = of_device_get_match_data(dev);
clk_prepare_enable(clk);
pm_runtime_enable(dev);
ret = pm_runtime_resume_and_get(dev);
if (ret < 0) {
dev_err(dev, "pm_runtime_resume_and_get failed\n");
pm_runtime_disable(dev);
goto clk_disable;
}
if (mhdp->info && mhdp->info->ops && mhdp->info->ops->init) {
ret = mhdp->info->ops->init(mhdp);
if (ret != 0) {
dev_err(dev, "MHDP platform initialization failed: %d\n",
ret);
goto runtime_put;
}
}
rate = clk_get_rate(clk);
writel(rate % 1000000, mhdp->regs + CDNS_SW_CLK_L);
writel(rate / 1000000, mhdp->regs + CDNS_SW_CLK_H);
dev_dbg(dev, "func clk rate %lu Hz\n", rate);
writel(~0, mhdp->regs + CDNS_APB_INT_MASK);
irq = platform_get_irq(pdev, 0);
ret = devm_request_threaded_irq(mhdp->dev, irq, NULL,
cdns_mhdp_irq_handler, IRQF_ONESHOT,
"mhdp8546", mhdp);
if (ret) {
dev_err(dev, "cannot install IRQ %d\n", irq);
ret = -EIO;
goto plat_fini;
}
cdns_mhdp_fill_host_caps(mhdp);
/* Initialize link rate and num of lanes to host values */
mhdp->link.rate = mhdp->host.link_rate;
mhdp->link.num_lanes = mhdp->host.lanes_cnt;
/* The only currently supported format */
mhdp->display_fmt.y_only = false;
mhdp->display_fmt.color_format = DRM_COLOR_FORMAT_RGB444;
mhdp->display_fmt.bpc = 8;
mhdp->bridge.of_node = pdev->dev.of_node;
mhdp->bridge.funcs = &cdns_mhdp_bridge_funcs;
mhdp->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID |
DRM_BRIDGE_OP_HPD;
mhdp->bridge.type = DRM_MODE_CONNECTOR_DisplayPort;
if (mhdp->info)
mhdp->bridge.timings = mhdp->info->timings;
ret = phy_init(mhdp->phy);
if (ret) {
dev_err(mhdp->dev, "Failed to initialize PHY: %d\n", ret);
goto plat_fini;
}
/* Initialize the work for modeset in case of link train failure */
INIT_WORK(&mhdp->modeset_retry_work, cdns_mhdp_modeset_retry_fn);
INIT_WORK(&mhdp->hpd_work, cdns_mhdp_hpd_work);
init_waitqueue_head(&mhdp->fw_load_wq);
init_waitqueue_head(&mhdp->sw_events_wq);
ret = cdns_mhdp_load_firmware(mhdp);
if (ret)
goto phy_exit;
if (mhdp->hdcp_supported)
cdns_mhdp_hdcp_init(mhdp);
drm_bridge_add(&mhdp->bridge);
return 0;
phy_exit:
phy_exit(mhdp->phy);
plat_fini:
if (mhdp->info && mhdp->info->ops && mhdp->info->ops->exit)
mhdp->info->ops->exit(mhdp);
runtime_put:
pm_runtime_put_sync(dev);
pm_runtime_disable(dev);
clk_disable:
clk_disable_unprepare(mhdp->clk);
return ret;
}
static int cdns_mhdp_remove(struct platform_device *pdev)
{
struct cdns_mhdp_device *mhdp = platform_get_drvdata(pdev);
unsigned long timeout = msecs_to_jiffies(100);
bool stop_fw = false;
int ret;
drm_bridge_remove(&mhdp->bridge);
ret = wait_event_timeout(mhdp->fw_load_wq,
mhdp->hw_state == MHDP_HW_READY,
timeout);
if (ret == 0)
dev_err(mhdp->dev, "%s: Timeout waiting for fw loading\n",
__func__);
else
stop_fw = true;
spin_lock(&mhdp->start_lock);
mhdp->hw_state = MHDP_HW_STOPPED;
spin_unlock(&mhdp->start_lock);
if (stop_fw)
ret = cdns_mhdp_set_firmware_active(mhdp, false);
phy_exit(mhdp->phy);
if (mhdp->info && mhdp->info->ops && mhdp->info->ops->exit)
mhdp->info->ops->exit(mhdp);
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
cancel_work_sync(&mhdp->modeset_retry_work);
flush_work(&mhdp->hpd_work);
/* Ignoring mhdp->hdcp.check_work and mhdp->hdcp.prop_work here. */
clk_disable_unprepare(mhdp->clk);
return ret;
}
static const struct of_device_id mhdp_ids[] = {
{ .compatible = "cdns,mhdp8546", },
#ifdef CONFIG_DRM_CDNS_MHDP8546_J721E
{ .compatible = "ti,j721e-mhdp8546",
.data = &(const struct cdns_mhdp_platform_info) {
.timings = &mhdp_ti_j721e_bridge_timings,
.ops = &mhdp_ti_j721e_ops,
},
},
#endif
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mhdp_ids);
static struct platform_driver mhdp_driver = {
.driver = {
.name = "cdns-mhdp8546",
.of_match_table = of_match_ptr(mhdp_ids),
},
.probe = cdns_mhdp_probe,
.remove = cdns_mhdp_remove,
};
module_platform_driver(mhdp_driver);
MODULE_FIRMWARE(FW_NAME);
MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>");
MODULE_AUTHOR("Swapnil Jakhade <sjakhade@cadence.com>");
MODULE_AUTHOR("Yuti Amonkar <yamonkar@cadence.com>");
MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>");
MODULE_DESCRIPTION("Cadence MHDP8546 DP bridge driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:cdns-mhdp8546");
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