384 lines
10 KiB
C
384 lines
10 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* i.MX drm driver - parallel display implementation
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*
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* Copyright (C) 2012 Sascha Hauer, Pengutronix
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*/
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#include <linux/component.h>
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#include <linux/media-bus-format.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/videodev2.h>
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#include <video/of_display_timing.h>
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#include <drm/drm_atomic_helper.h>
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#include <drm/drm_bridge.h>
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#include <drm/drm_edid.h>
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#include <drm/drm_managed.h>
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#include <drm/drm_of.h>
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#include <drm/drm_panel.h>
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#include <drm/drm_probe_helper.h>
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#include <drm/drm_simple_kms_helper.h>
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#include "imx-drm.h"
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struct imx_parallel_display_encoder {
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struct drm_connector connector;
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struct drm_encoder encoder;
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struct drm_bridge bridge;
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struct imx_parallel_display *pd;
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};
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struct imx_parallel_display {
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struct device *dev;
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void *edid;
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u32 bus_format;
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u32 bus_flags;
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struct drm_display_mode mode;
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struct drm_panel *panel;
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struct drm_bridge *next_bridge;
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};
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static inline struct imx_parallel_display *con_to_imxpd(struct drm_connector *c)
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{
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return container_of(c, struct imx_parallel_display_encoder, connector)->pd;
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}
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static inline struct imx_parallel_display *bridge_to_imxpd(struct drm_bridge *b)
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{
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return container_of(b, struct imx_parallel_display_encoder, bridge)->pd;
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}
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static int imx_pd_connector_get_modes(struct drm_connector *connector)
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{
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struct imx_parallel_display *imxpd = con_to_imxpd(connector);
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struct device_node *np = imxpd->dev->of_node;
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int num_modes;
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num_modes = drm_panel_get_modes(imxpd->panel, connector);
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if (num_modes > 0)
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return num_modes;
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if (imxpd->edid) {
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drm_connector_update_edid_property(connector, imxpd->edid);
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num_modes = drm_add_edid_modes(connector, imxpd->edid);
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}
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if (np) {
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struct drm_display_mode *mode = drm_mode_create(connector->dev);
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int ret;
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if (!mode)
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return -EINVAL;
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ret = of_get_drm_display_mode(np, &imxpd->mode,
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&imxpd->bus_flags,
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OF_USE_NATIVE_MODE);
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if (ret) {
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drm_mode_destroy(connector->dev, mode);
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return ret;
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}
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drm_mode_copy(mode, &imxpd->mode);
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mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
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drm_mode_probed_add(connector, mode);
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num_modes++;
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}
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return num_modes;
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}
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static void imx_pd_bridge_enable(struct drm_bridge *bridge)
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{
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struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
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drm_panel_prepare(imxpd->panel);
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drm_panel_enable(imxpd->panel);
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}
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static void imx_pd_bridge_disable(struct drm_bridge *bridge)
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{
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struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
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drm_panel_disable(imxpd->panel);
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drm_panel_unprepare(imxpd->panel);
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}
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static const u32 imx_pd_bus_fmts[] = {
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MEDIA_BUS_FMT_RGB888_1X24,
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MEDIA_BUS_FMT_BGR888_1X24,
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MEDIA_BUS_FMT_GBR888_1X24,
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MEDIA_BUS_FMT_RGB666_1X18,
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MEDIA_BUS_FMT_RGB666_1X24_CPADHI,
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MEDIA_BUS_FMT_RGB565_1X16,
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};
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static u32 *
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imx_pd_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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struct drm_display_info *di = &conn_state->connector->display_info;
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struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
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u32 *output_fmts;
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if (!imxpd->bus_format && !di->num_bus_formats) {
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*num_output_fmts = ARRAY_SIZE(imx_pd_bus_fmts);
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return kmemdup(imx_pd_bus_fmts, sizeof(imx_pd_bus_fmts),
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GFP_KERNEL);
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}
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*num_output_fmts = 1;
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output_fmts = kmalloc(sizeof(*output_fmts), GFP_KERNEL);
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if (!output_fmts)
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return NULL;
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if (!imxpd->bus_format && di->num_bus_formats)
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output_fmts[0] = di->bus_formats[0];
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else
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output_fmts[0] = imxpd->bus_format;
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return output_fmts;
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}
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static bool imx_pd_format_supported(u32 output_fmt)
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{
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(imx_pd_bus_fmts); i++) {
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if (imx_pd_bus_fmts[i] == output_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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imx_pd_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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struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
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u32 *input_fmts;
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/*
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* If the next bridge does not support bus format negotiation, let's
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* use the static bus format definition (imxpd->bus_format) if it's
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* specified, RGB888 when it's not.
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*/
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if (output_fmt == MEDIA_BUS_FMT_FIXED)
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output_fmt = imxpd->bus_format ? : MEDIA_BUS_FMT_RGB888_1X24;
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/* Now make sure the requested output format is supported. */
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if ((imxpd->bus_format && imxpd->bus_format != output_fmt) ||
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!imx_pd_format_supported(output_fmt)) {
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*num_input_fmts = 0;
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return NULL;
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}
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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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input_fmts[0] = output_fmt;
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return input_fmts;
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}
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static int imx_pd_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 imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
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struct drm_display_info *di = &conn_state->connector->display_info;
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struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
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struct drm_bridge_state *next_bridge_state = NULL;
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struct drm_bridge *next_bridge;
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u32 bus_flags, bus_fmt;
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next_bridge = drm_bridge_get_next_bridge(bridge);
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if (next_bridge)
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next_bridge_state = drm_atomic_get_new_bridge_state(crtc_state->state,
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next_bridge);
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if (next_bridge_state)
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bus_flags = next_bridge_state->input_bus_cfg.flags;
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else if (di->num_bus_formats)
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bus_flags = di->bus_flags;
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else
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bus_flags = imxpd->bus_flags;
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bus_fmt = bridge_state->input_bus_cfg.format;
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if (!imx_pd_format_supported(bus_fmt))
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return -EINVAL;
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bridge_state->output_bus_cfg.flags = bus_flags;
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bridge_state->input_bus_cfg.flags = bus_flags;
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imx_crtc_state->bus_flags = bus_flags;
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imx_crtc_state->bus_format = bridge_state->input_bus_cfg.format;
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imx_crtc_state->di_hsync_pin = 2;
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imx_crtc_state->di_vsync_pin = 3;
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return 0;
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}
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static const struct drm_connector_funcs imx_pd_connector_funcs = {
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.fill_modes = drm_helper_probe_single_connector_modes,
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.destroy = imx_drm_connector_destroy,
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.reset = drm_atomic_helper_connector_reset,
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.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
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.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
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};
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static const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
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.get_modes = imx_pd_connector_get_modes,
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};
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static const struct drm_bridge_funcs imx_pd_bridge_funcs = {
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.enable = imx_pd_bridge_enable,
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.disable = imx_pd_bridge_disable,
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.atomic_reset = drm_atomic_helper_bridge_reset,
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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_check = imx_pd_bridge_atomic_check,
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.atomic_get_input_bus_fmts = imx_pd_bridge_atomic_get_input_bus_fmts,
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.atomic_get_output_bus_fmts = imx_pd_bridge_atomic_get_output_bus_fmts,
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};
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static int imx_pd_bind(struct device *dev, struct device *master, void *data)
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{
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struct drm_device *drm = data;
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struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
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struct imx_parallel_display_encoder *imxpd_encoder;
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struct drm_connector *connector;
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struct drm_encoder *encoder;
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struct drm_bridge *bridge;
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int ret;
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imxpd_encoder = drmm_simple_encoder_alloc(drm, struct imx_parallel_display_encoder,
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encoder, DRM_MODE_ENCODER_NONE);
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if (IS_ERR(imxpd_encoder))
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return PTR_ERR(imxpd_encoder);
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imxpd_encoder->pd = imxpd;
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connector = &imxpd_encoder->connector;
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encoder = &imxpd_encoder->encoder;
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bridge = &imxpd_encoder->bridge;
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ret = imx_drm_encoder_parse_of(drm, encoder, imxpd->dev->of_node);
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if (ret)
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return ret;
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/* set the connector's dpms to OFF so that
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* drm_helper_connector_dpms() won't return
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* immediately since the current state is ON
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* at this point.
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*/
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connector->dpms = DRM_MODE_DPMS_OFF;
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bridge->funcs = &imx_pd_bridge_funcs;
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drm_bridge_attach(encoder, bridge, NULL, 0);
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if (imxpd->next_bridge) {
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ret = drm_bridge_attach(encoder, imxpd->next_bridge, bridge, 0);
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if (ret < 0)
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return ret;
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} else {
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drm_connector_helper_add(connector,
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&imx_pd_connector_helper_funcs);
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drm_connector_init(drm, connector, &imx_pd_connector_funcs,
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DRM_MODE_CONNECTOR_DPI);
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drm_connector_attach_encoder(connector, encoder);
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}
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return 0;
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}
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static const struct component_ops imx_pd_ops = {
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.bind = imx_pd_bind,
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};
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static int imx_pd_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *np = dev->of_node;
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const u8 *edidp;
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struct imx_parallel_display *imxpd;
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int edid_len;
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int ret;
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u32 bus_format = 0;
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const char *fmt;
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imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
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if (!imxpd)
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return -ENOMEM;
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/* port@1 is the output port */
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ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel,
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&imxpd->next_bridge);
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if (ret && ret != -ENODEV)
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return ret;
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edidp = of_get_property(np, "edid", &edid_len);
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if (edidp)
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imxpd->edid = devm_kmemdup(dev, edidp, edid_len, GFP_KERNEL);
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ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
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if (!ret) {
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if (!strcmp(fmt, "rgb24"))
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bus_format = MEDIA_BUS_FMT_RGB888_1X24;
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else if (!strcmp(fmt, "rgb565"))
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bus_format = MEDIA_BUS_FMT_RGB565_1X16;
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else if (!strcmp(fmt, "bgr666"))
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bus_format = MEDIA_BUS_FMT_RGB666_1X18;
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else if (!strcmp(fmt, "lvds666"))
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bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
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}
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imxpd->bus_format = bus_format;
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imxpd->dev = dev;
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platform_set_drvdata(pdev, imxpd);
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return component_add(dev, &imx_pd_ops);
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}
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static int imx_pd_remove(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
component_del(&pdev->dev, &imx_pd_ops);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct of_device_id imx_pd_dt_ids[] = {
|
||
|
|
{ .compatible = "fsl,imx-parallel-display", },
|
||
|
|
{ /* sentinel */ }
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
|
||
|
|
|
||
|
|
static struct platform_driver imx_pd_driver = {
|
||
|
|
.probe = imx_pd_probe,
|
||
|
|
.remove = imx_pd_remove,
|
||
|
|
.driver = {
|
||
|
|
.of_match_table = imx_pd_dt_ids,
|
||
|
|
.name = "imx-parallel-display",
|
||
|
|
},
|
||
|
|
};
|
||
|
|
|
||
|
|
module_platform_driver(imx_pd_driver);
|
||
|
|
|
||
|
|
MODULE_DESCRIPTION("i.MX parallel display driver");
|
||
|
|
MODULE_AUTHOR("Sascha Hauer, Pengutronix");
|
||
|
|
MODULE_LICENSE("GPL");
|
||
|
|
MODULE_ALIAS("platform:imx-parallel-display");
|