489 lines
12 KiB
C
489 lines
12 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2020 NXP
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*/
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#include <linux/firmware/imx/svc/misc.h>
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#include <linux/media-bus-format.h>
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#include <linux/mfd/syscon.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/of_graph.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/regmap.h>
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#include <drm/drm_atomic_state_helper.h>
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#include <drm/drm_bridge.h>
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#include <drm/drm_of.h>
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#include <drm/drm_print.h>
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#include <dt-bindings/firmware/imx/rsrc.h>
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#define PXL2DPI_CTRL 0x40
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#define CFG1_16BIT 0x0
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#define CFG2_16BIT 0x1
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#define CFG3_16BIT 0x2
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#define CFG1_18BIT 0x3
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#define CFG2_18BIT 0x4
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#define CFG_24BIT 0x5
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#define DRIVER_NAME "imx8qxp-pxl2dpi"
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struct imx8qxp_pxl2dpi {
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struct regmap *regmap;
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struct drm_bridge bridge;
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struct drm_bridge *next_bridge;
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struct drm_bridge *companion;
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struct device *dev;
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struct imx_sc_ipc *ipc_handle;
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u32 sc_resource;
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u32 in_bus_format;
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u32 out_bus_format;
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u32 pl_sel;
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};
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#define bridge_to_p2d(b) container_of(b, struct imx8qxp_pxl2dpi, bridge)
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static int imx8qxp_pxl2dpi_bridge_attach(struct drm_bridge *bridge,
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enum drm_bridge_attach_flags flags)
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{
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struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;
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if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
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DRM_DEV_ERROR(p2d->dev,
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"do not support creating a drm_connector\n");
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return -EINVAL;
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}
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if (!bridge->encoder) {
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DRM_DEV_ERROR(p2d->dev, "missing encoder\n");
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return -ENODEV;
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}
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return drm_bridge_attach(bridge->encoder,
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p2d->next_bridge, bridge,
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DRM_BRIDGE_ATTACH_NO_CONNECTOR);
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}
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static int
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imx8qxp_pxl2dpi_bridge_atomic_check(struct drm_bridge *bridge,
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struct drm_bridge_state *bridge_state,
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struct drm_crtc_state *crtc_state,
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struct drm_connector_state *conn_state)
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{
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struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;
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p2d->in_bus_format = bridge_state->input_bus_cfg.format;
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p2d->out_bus_format = bridge_state->output_bus_cfg.format;
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return 0;
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}
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static void
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imx8qxp_pxl2dpi_bridge_mode_set(struct drm_bridge *bridge,
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const struct drm_display_mode *mode,
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const struct drm_display_mode *adjusted_mode)
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{
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struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;
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struct imx8qxp_pxl2dpi *companion_p2d;
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int ret;
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ret = pm_runtime_get_sync(p2d->dev);
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if (ret < 0)
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DRM_DEV_ERROR(p2d->dev,
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"failed to get runtime PM sync: %d\n", ret);
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ret = imx_sc_misc_set_control(p2d->ipc_handle, p2d->sc_resource,
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IMX_SC_C_PXL_LINK_SEL, p2d->pl_sel);
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if (ret)
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DRM_DEV_ERROR(p2d->dev,
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"failed to set pixel link selection(%u): %d\n",
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p2d->pl_sel, ret);
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switch (p2d->out_bus_format) {
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case MEDIA_BUS_FMT_RGB888_1X24:
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regmap_write(p2d->regmap, PXL2DPI_CTRL, CFG_24BIT);
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break;
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case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
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regmap_write(p2d->regmap, PXL2DPI_CTRL, CFG2_18BIT);
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break;
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default:
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DRM_DEV_ERROR(p2d->dev,
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"unsupported output bus format 0x%08x\n",
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p2d->out_bus_format);
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}
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if (p2d->companion) {
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companion_p2d = bridge_to_p2d(p2d->companion);
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companion_p2d->in_bus_format = p2d->in_bus_format;
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companion_p2d->out_bus_format = p2d->out_bus_format;
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p2d->companion->funcs->mode_set(p2d->companion, mode,
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adjusted_mode);
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}
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}
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static void
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imx8qxp_pxl2dpi_bridge_atomic_disable(struct drm_bridge *bridge,
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struct drm_bridge_state *old_bridge_state)
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{
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struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;
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int ret;
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ret = pm_runtime_put(p2d->dev);
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if (ret < 0)
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DRM_DEV_ERROR(p2d->dev, "failed to put runtime PM: %d\n", ret);
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if (p2d->companion)
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p2d->companion->funcs->atomic_disable(p2d->companion,
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old_bridge_state);
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}
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static const u32 imx8qxp_pxl2dpi_bus_output_fmts[] = {
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MEDIA_BUS_FMT_RGB888_1X24,
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MEDIA_BUS_FMT_RGB666_1X24_CPADHI,
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};
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static bool imx8qxp_pxl2dpi_bus_output_fmt_supported(u32 fmt)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(imx8qxp_pxl2dpi_bus_output_fmts); i++) {
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if (imx8qxp_pxl2dpi_bus_output_fmts[i] == fmt)
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return true;
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}
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return false;
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}
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static u32 *
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imx8qxp_pxl2dpi_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
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struct drm_bridge_state *bridge_state,
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struct drm_crtc_state *crtc_state,
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struct drm_connector_state *conn_state,
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u32 output_fmt,
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unsigned int *num_input_fmts)
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{
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u32 *input_fmts;
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if (!imx8qxp_pxl2dpi_bus_output_fmt_supported(output_fmt))
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return NULL;
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*num_input_fmts = 1;
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input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL);
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if (!input_fmts)
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return NULL;
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switch (output_fmt) {
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case MEDIA_BUS_FMT_RGB888_1X24:
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input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X36_CPADLO;
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break;
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case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
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input_fmts[0] = MEDIA_BUS_FMT_RGB666_1X36_CPADLO;
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break;
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default:
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kfree(input_fmts);
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input_fmts = NULL;
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break;
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}
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return input_fmts;
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}
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static u32 *
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imx8qxp_pxl2dpi_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge,
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struct drm_bridge_state *bridge_state,
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struct drm_crtc_state *crtc_state,
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struct drm_connector_state *conn_state,
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unsigned int *num_output_fmts)
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{
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*num_output_fmts = ARRAY_SIZE(imx8qxp_pxl2dpi_bus_output_fmts);
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return kmemdup(imx8qxp_pxl2dpi_bus_output_fmts,
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sizeof(imx8qxp_pxl2dpi_bus_output_fmts), GFP_KERNEL);
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}
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static const struct drm_bridge_funcs imx8qxp_pxl2dpi_bridge_funcs = {
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.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
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.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
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.atomic_reset = drm_atomic_helper_bridge_reset,
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.attach = imx8qxp_pxl2dpi_bridge_attach,
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.atomic_check = imx8qxp_pxl2dpi_bridge_atomic_check,
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.mode_set = imx8qxp_pxl2dpi_bridge_mode_set,
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.atomic_disable = imx8qxp_pxl2dpi_bridge_atomic_disable,
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.atomic_get_input_bus_fmts =
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imx8qxp_pxl2dpi_bridge_atomic_get_input_bus_fmts,
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.atomic_get_output_bus_fmts =
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imx8qxp_pxl2dpi_bridge_atomic_get_output_bus_fmts,
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};
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static struct device_node *
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imx8qxp_pxl2dpi_get_available_ep_from_port(struct imx8qxp_pxl2dpi *p2d,
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u32 port_id)
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{
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struct device_node *port, *ep;
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int ep_cnt;
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port = of_graph_get_port_by_id(p2d->dev->of_node, port_id);
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if (!port) {
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DRM_DEV_ERROR(p2d->dev, "failed to get port@%u\n", port_id);
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return ERR_PTR(-ENODEV);
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}
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ep_cnt = of_get_available_child_count(port);
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if (ep_cnt == 0) {
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DRM_DEV_ERROR(p2d->dev, "no available endpoints of port@%u\n",
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port_id);
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ep = ERR_PTR(-ENODEV);
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goto out;
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} else if (ep_cnt > 1) {
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DRM_DEV_ERROR(p2d->dev,
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"invalid available endpoints of port@%u\n",
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port_id);
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ep = ERR_PTR(-EINVAL);
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goto out;
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}
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ep = of_get_next_available_child(port, NULL);
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if (!ep) {
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DRM_DEV_ERROR(p2d->dev,
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"failed to get available endpoint of port@%u\n",
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port_id);
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ep = ERR_PTR(-ENODEV);
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goto out;
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}
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out:
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of_node_put(port);
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return ep;
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}
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static struct drm_bridge *
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imx8qxp_pxl2dpi_find_next_bridge(struct imx8qxp_pxl2dpi *p2d)
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{
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struct device_node *ep, *remote;
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struct drm_bridge *next_bridge;
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int ret;
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ep = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 1);
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if (IS_ERR(ep)) {
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ret = PTR_ERR(ep);
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return ERR_PTR(ret);
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}
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remote = of_graph_get_remote_port_parent(ep);
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if (!remote || !of_device_is_available(remote)) {
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DRM_DEV_ERROR(p2d->dev, "no available remote\n");
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next_bridge = ERR_PTR(-ENODEV);
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goto out;
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} else if (!of_device_is_available(remote->parent)) {
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DRM_DEV_ERROR(p2d->dev, "remote parent is not available\n");
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next_bridge = ERR_PTR(-ENODEV);
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goto out;
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}
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next_bridge = of_drm_find_bridge(remote);
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if (!next_bridge) {
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next_bridge = ERR_PTR(-EPROBE_DEFER);
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goto out;
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}
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out:
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of_node_put(remote);
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of_node_put(ep);
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return next_bridge;
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}
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static int imx8qxp_pxl2dpi_set_pixel_link_sel(struct imx8qxp_pxl2dpi *p2d)
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{
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struct device_node *ep;
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struct of_endpoint endpoint;
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int ret;
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ep = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 0);
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if (IS_ERR(ep))
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return PTR_ERR(ep);
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ret = of_graph_parse_endpoint(ep, &endpoint);
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if (ret) {
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DRM_DEV_ERROR(p2d->dev,
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"failed to parse endpoint of port@0: %d\n", ret);
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goto out;
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}
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p2d->pl_sel = endpoint.id;
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out:
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of_node_put(ep);
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return ret;
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}
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static int imx8qxp_pxl2dpi_parse_dt_companion(struct imx8qxp_pxl2dpi *p2d)
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{
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struct imx8qxp_pxl2dpi *companion_p2d;
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struct device *dev = p2d->dev;
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struct device_node *companion;
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struct device_node *port1, *port2;
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const struct of_device_id *match;
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int dual_link;
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int ret = 0;
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/* Locate the companion PXL2DPI for dual-link operation, if any. */
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companion = of_parse_phandle(dev->of_node, "fsl,companion-pxl2dpi", 0);
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if (!companion)
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return 0;
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if (!of_device_is_available(companion)) {
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DRM_DEV_ERROR(dev, "companion PXL2DPI is not available\n");
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ret = -ENODEV;
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goto out;
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}
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/*
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* Sanity check: the companion bridge must have the same compatible
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* string.
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*/
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match = of_match_device(dev->driver->of_match_table, dev);
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if (!of_device_is_compatible(companion, match->compatible)) {
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DRM_DEV_ERROR(dev, "companion PXL2DPI is incompatible\n");
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|
|
ret = -ENXIO;
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
p2d->companion = of_drm_find_bridge(companion);
|
||
|
|
if (!p2d->companion) {
|
||
|
|
ret = -EPROBE_DEFER;
|
||
|
|
DRM_DEV_DEBUG_DRIVER(p2d->dev,
|
||
|
|
"failed to find companion bridge: %d\n",
|
||
|
|
ret);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
companion_p2d = bridge_to_p2d(p2d->companion);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* We need to work out if the sink is expecting us to function in
|
||
|
|
* dual-link mode. We do this by looking at the DT port nodes that
|
||
|
|
* the next bridges are connected to. If they are marked as expecting
|
||
|
|
* even pixels and odd pixels than we need to use the companion PXL2DPI.
|
||
|
|
*/
|
||
|
|
port1 = of_graph_get_port_by_id(p2d->next_bridge->of_node, 1);
|
||
|
|
port2 = of_graph_get_port_by_id(companion_p2d->next_bridge->of_node, 1);
|
||
|
|
dual_link = drm_of_lvds_get_dual_link_pixel_order(port1, port2);
|
||
|
|
of_node_put(port1);
|
||
|
|
of_node_put(port2);
|
||
|
|
|
||
|
|
if (dual_link < 0) {
|
||
|
|
ret = dual_link;
|
||
|
|
DRM_DEV_ERROR(dev, "failed to get dual link pixel order: %d\n",
|
||
|
|
ret);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
DRM_DEV_DEBUG_DRIVER(dev,
|
||
|
|
"dual-link configuration detected (companion bridge %pOF)\n",
|
||
|
|
companion);
|
||
|
|
out:
|
||
|
|
of_node_put(companion);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int imx8qxp_pxl2dpi_bridge_probe(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
struct imx8qxp_pxl2dpi *p2d;
|
||
|
|
struct device *dev = &pdev->dev;
|
||
|
|
struct device_node *np = dev->of_node;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
p2d = devm_kzalloc(dev, sizeof(*p2d), GFP_KERNEL);
|
||
|
|
if (!p2d)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
p2d->regmap = syscon_node_to_regmap(np->parent);
|
||
|
|
if (IS_ERR(p2d->regmap)) {
|
||
|
|
ret = PTR_ERR(p2d->regmap);
|
||
|
|
if (ret != -EPROBE_DEFER)
|
||
|
|
DRM_DEV_ERROR(dev, "failed to get regmap: %d\n", ret);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = imx_scu_get_handle(&p2d->ipc_handle);
|
||
|
|
if (ret) {
|
||
|
|
if (ret != -EPROBE_DEFER)
|
||
|
|
DRM_DEV_ERROR(dev, "failed to get SCU ipc handle: %d\n",
|
||
|
|
ret);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
p2d->dev = dev;
|
||
|
|
|
||
|
|
ret = of_property_read_u32(np, "fsl,sc-resource", &p2d->sc_resource);
|
||
|
|
if (ret) {
|
||
|
|
DRM_DEV_ERROR(dev, "failed to get SC resource %d\n", ret);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
p2d->next_bridge = imx8qxp_pxl2dpi_find_next_bridge(p2d);
|
||
|
|
if (IS_ERR(p2d->next_bridge)) {
|
||
|
|
ret = PTR_ERR(p2d->next_bridge);
|
||
|
|
if (ret != -EPROBE_DEFER)
|
||
|
|
DRM_DEV_ERROR(dev, "failed to find next bridge: %d\n",
|
||
|
|
ret);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = imx8qxp_pxl2dpi_set_pixel_link_sel(p2d);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
ret = imx8qxp_pxl2dpi_parse_dt_companion(p2d);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
platform_set_drvdata(pdev, p2d);
|
||
|
|
pm_runtime_enable(dev);
|
||
|
|
|
||
|
|
p2d->bridge.driver_private = p2d;
|
||
|
|
p2d->bridge.funcs = &imx8qxp_pxl2dpi_bridge_funcs;
|
||
|
|
p2d->bridge.of_node = np;
|
||
|
|
|
||
|
|
drm_bridge_add(&p2d->bridge);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int imx8qxp_pxl2dpi_bridge_remove(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
struct imx8qxp_pxl2dpi *p2d = platform_get_drvdata(pdev);
|
||
|
|
|
||
|
|
drm_bridge_remove(&p2d->bridge);
|
||
|
|
|
||
|
|
pm_runtime_disable(&pdev->dev);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct of_device_id imx8qxp_pxl2dpi_dt_ids[] = {
|
||
|
|
{ .compatible = "fsl,imx8qxp-pxl2dpi", },
|
||
|
|
{ /* sentinel */ }
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(of, imx8qxp_pxl2dpi_dt_ids);
|
||
|
|
|
||
|
|
static struct platform_driver imx8qxp_pxl2dpi_bridge_driver = {
|
||
|
|
.probe = imx8qxp_pxl2dpi_bridge_probe,
|
||
|
|
.remove = imx8qxp_pxl2dpi_bridge_remove,
|
||
|
|
.driver = {
|
||
|
|
.of_match_table = imx8qxp_pxl2dpi_dt_ids,
|
||
|
|
.name = DRIVER_NAME,
|
||
|
|
},
|
||
|
|
};
|
||
|
|
module_platform_driver(imx8qxp_pxl2dpi_bridge_driver);
|
||
|
|
|
||
|
|
MODULE_DESCRIPTION("i.MX8QXP pixel link to DPI bridge driver");
|
||
|
|
MODULE_AUTHOR("Liu Ying <victor.liu@nxp.com>");
|
||
|
|
MODULE_LICENSE("GPL v2");
|
||
|
|
MODULE_ALIAS("platform:" DRIVER_NAME);
|