Staging
v0.7.0
v0.7.0
// 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;
int edid_len;
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 *enc_to_imxpd(struct drm_encoder *e)
{
return container_of(e, struct imx_parallel_display, encoder);
}
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;
if (bus_flags &
~(DRM_BUS_FLAG_DE_LOW | DRM_BUS_FLAG_DE_HIGH |
DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE |
DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)) {
dev_warn(imxpd->dev, "invalid bus_flags (%x)\n", bus_flags);
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 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", &imxpd->edid_len);
if (edidp)
imxpd->edid = kmemdup(edidp, imxpd->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 void imx_pd_unbind(struct device *dev, struct device *master,
void *data)
{
struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
kfree(imxpd->edid);
}
static const struct component_ops imx_pd_ops = {
.bind = imx_pd_bind,
.unbind = imx_pd_unbind,
};
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");