Orange Pi5 kernel

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