294 lines
7.4 KiB
C
294 lines
7.4 KiB
C
// 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/module.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_fb_helper.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 "imx-drm.h"
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struct imx_parallel_display {
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struct drm_connector connector;
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struct drm_encoder encoder;
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struct device *dev;
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void *edid;
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int edid_len;
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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 *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, connector);
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}
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static inline struct imx_parallel_display *enc_to_imxpd(struct drm_encoder *e)
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{
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return container_of(e, struct imx_parallel_display, encoder);
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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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return ret;
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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 struct drm_encoder *imx_pd_connector_best_encoder(
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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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return &imxpd->encoder;
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}
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static void imx_pd_encoder_enable(struct drm_encoder *encoder)
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{
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struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
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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_encoder_disable(struct drm_encoder *encoder)
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{
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struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
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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 int imx_pd_encoder_atomic_check(struct drm_encoder *encoder,
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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 = enc_to_imxpd(encoder);
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if (!imxpd->bus_format && di->num_bus_formats) {
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imx_crtc_state->bus_flags = di->bus_flags;
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imx_crtc_state->bus_format = di->bus_formats[0];
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} else {
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imx_crtc_state->bus_flags = imxpd->bus_flags;
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imx_crtc_state->bus_format = imxpd->bus_format;
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}
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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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.best_encoder = imx_pd_connector_best_encoder,
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};
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static const struct drm_encoder_funcs imx_pd_encoder_funcs = {
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.destroy = imx_drm_encoder_destroy,
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};
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static const struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
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.enable = imx_pd_encoder_enable,
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.disable = imx_pd_encoder_disable,
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.atomic_check = imx_pd_encoder_atomic_check,
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};
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static int imx_pd_register(struct drm_device *drm,
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struct imx_parallel_display *imxpd)
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{
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struct drm_encoder *encoder = &imxpd->encoder;
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int ret;
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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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imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
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drm_encoder_helper_add(encoder, &imx_pd_encoder_helper_funcs);
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drm_encoder_init(drm, encoder, &imx_pd_encoder_funcs,
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DRM_MODE_ENCODER_NONE, NULL);
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if (!imxpd->bridge) {
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drm_connector_helper_add(&imxpd->connector,
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&imx_pd_connector_helper_funcs);
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drm_connector_init(drm, &imxpd->connector,
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&imx_pd_connector_funcs,
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DRM_MODE_CONNECTOR_DPI);
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}
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if (imxpd->panel)
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drm_panel_attach(imxpd->panel, &imxpd->connector);
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if (imxpd->bridge) {
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ret = drm_bridge_attach(encoder, imxpd->bridge, NULL);
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if (ret < 0) {
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dev_err(imxpd->dev, "failed to attach bridge: %d\n",
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ret);
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return ret;
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}
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} else {
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drm_connector_attach_encoder(&imxpd->connector, encoder);
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}
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return 0;
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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 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 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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edidp = of_get_property(np, "edid", &imxpd->edid_len);
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if (edidp)
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imxpd->edid = kmemdup(edidp, imxpd->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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/* port@1 is the output port */
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ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel, &imxpd->bridge);
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if (ret && ret != -ENODEV)
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return ret;
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imxpd->dev = dev;
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ret = imx_pd_register(drm, imxpd);
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if (ret)
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return ret;
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dev_set_drvdata(dev, imxpd);
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return 0;
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}
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static void imx_pd_unbind(struct device *dev, struct device *master,
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void *data)
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{
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struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
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if (imxpd->panel)
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drm_panel_detach(imxpd->panel);
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kfree(imxpd->edid);
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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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.unbind = imx_pd_unbind,
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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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return component_add(&pdev->dev, &imx_pd_ops);
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}
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static int imx_pd_remove(struct platform_device *pdev)
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{
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component_del(&pdev->dev, &imx_pd_ops);
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return 0;
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}
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static const struct of_device_id imx_pd_dt_ids[] = {
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{ .compatible = "fsl,imx-parallel-display", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
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static struct platform_driver imx_pd_driver = {
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.probe = imx_pd_probe,
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.remove = imx_pd_remove,
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.driver = {
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.of_match_table = imx_pd_dt_ids,
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.name = "imx-parallel-display",
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},
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};
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module_platform_driver(imx_pd_driver);
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MODULE_DESCRIPTION("i.MX parallel display driver");
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MODULE_AUTHOR("Sascha Hauer, Pengutronix");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:imx-parallel-display");
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