// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2020 NXP
*/
#include <linux/firmware/imx/svc/misc.h>
#include <linux/media-bus-format.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <drm/drm_atomic_state_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_of.h>
#include <drm/drm_print.h>
#include <dt-bindings/firmware/imx/rsrc.h>
#define PXL2DPI_CTRL 0x40
#define CFG1_16BIT 0x0
#define CFG2_16BIT 0x1
#define CFG3_16BIT 0x2
#define CFG1_18BIT 0x3
#define CFG2_18BIT 0x4
#define CFG_24BIT 0x5
#define DRIVER_NAME "imx8qxp-pxl2dpi"
struct imx8qxp_pxl2dpi {
struct regmap *regmap;
struct drm_bridge bridge;
struct drm_bridge *next_bridge;
struct drm_bridge *companion;
struct device *dev;
struct imx_sc_ipc *ipc_handle;
u32 sc_resource;
u32 in_bus_format;
u32 out_bus_format;
u32 pl_sel;
};
#define bridge_to_p2d(b) container_of(b, struct imx8qxp_pxl2dpi, bridge)
static int imx8qxp_pxl2dpi_bridge_attach(struct drm_bridge *bridge,
enum drm_bridge_attach_flags flags)
{
struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;
if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
DRM_DEV_ERROR(p2d->dev,
"do not support creating a drm_connector\n");
return -EINVAL;
}
return drm_bridge_attach(bridge->encoder,
p2d->next_bridge, bridge,
DRM_BRIDGE_ATTACH_NO_CONNECTOR);
}
static int
imx8qxp_pxl2dpi_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 imx8qxp_pxl2dpi *p2d = bridge->driver_private;
p2d->in_bus_format = bridge_state->input_bus_cfg.format;
p2d->out_bus_format = bridge_state->output_bus_cfg.format;
return 0;
}
static void
imx8qxp_pxl2dpi_bridge_mode_set(struct drm_bridge *bridge,
const struct drm_display_mode *mode,
const struct drm_display_mode *adjusted_mode)
{
struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;
struct imx8qxp_pxl2dpi *companion_p2d;
int ret;
ret = pm_runtime_get_sync(p2d->dev);
if (ret < 0)
DRM_DEV_ERROR(p2d->dev,
"failed to get runtime PM sync: %d\n", ret);
ret = imx_sc_misc_set_control(p2d->ipc_handle, p2d->sc_resource,
IMX_SC_C_PXL_LINK_SEL, p2d->pl_sel);
if (ret)
DRM_DEV_ERROR(p2d->dev,
"failed to set pixel link selection(%u): %d\n",
p2d->pl_sel, ret);
switch (p2d->out_bus_format) {
case MEDIA_BUS_FMT_RGB888_1X24:
regmap_write(p2d->regmap, PXL2DPI_CTRL, CFG_24BIT);
break;
case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
regmap_write(p2d->regmap, PXL2DPI_CTRL, CFG2_18BIT);
break;
default:
DRM_DEV_ERROR(p2d->dev,
"unsupported output bus format 0x%08x\n",
p2d->out_bus_format);
}
if (p2d->companion) {
companion_p2d = bridge_to_p2d(p2d->companion);
companion_p2d->in_bus_format = p2d->in_bus_format;
companion_p2d->out_bus_format = p2d->out_bus_format;
p2d->companion->funcs->mode_set(p2d->companion, mode,
adjusted_mode);
}
}
static void
imx8qxp_pxl2dpi_bridge_atomic_disable(struct drm_bridge *bridge,
struct drm_bridge_state *old_bridge_state)
{
struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;
int ret;
ret = pm_runtime_put(p2d->dev);
if (ret < 0)
DRM_DEV_ERROR(p2d->dev, "failed to put runtime PM: %d\n", ret);
if (p2d->companion)
p2d->companion->funcs->atomic_disable(p2d->companion,
old_bridge_state);
}
static const u32 imx8qxp_pxl2dpi_bus_output_fmts[] = {
MEDIA_BUS_FMT_RGB888_1X24,
MEDIA_BUS_FMT_RGB666_1X24_CPADHI,
};
static bool imx8qxp_pxl2dpi_bus_output_fmt_supported(u32 fmt)
{
int i;
for (i = 0; i < ARRAY_SIZE(imx8qxp_pxl2dpi_bus_output_fmts); i++) {
if (imx8qxp_pxl2dpi_bus_output_fmts[i] == fmt)
return true;
}
return false;
}
static u32 *
imx8qxp_pxl2dpi_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)
{
u32 *input_fmts;
if (!imx8qxp_pxl2dpi_bus_output_fmt_supported(output_fmt))
return NULL;
*num_input_fmts = 1;
input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL);
if (!input_fmts)
return NULL;
switch (output_fmt) {
case MEDIA_BUS_FMT_RGB888_1X24:
input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X36_CPADLO;
break;
case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
input_fmts[0] = MEDIA_BUS_FMT_RGB666_1X36_CPADLO;
break;
default:
kfree(input_fmts);
input_fmts = NULL;
break;
}
return input_fmts;
}
static u32 *
imx8qxp_pxl2dpi_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)
{
*num_output_fmts = ARRAY_SIZE(imx8qxp_pxl2dpi_bus_output_fmts);
return kmemdup(imx8qxp_pxl2dpi_bus_output_fmts,
sizeof(imx8qxp_pxl2dpi_bus_output_fmts), GFP_KERNEL);
}
static const struct drm_bridge_funcs imx8qxp_pxl2dpi_bridge_funcs = {
.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
.atomic_reset = drm_atomic_helper_bridge_reset,
.attach = imx8qxp_pxl2dpi_bridge_attach,
.atomic_check = imx8qxp_pxl2dpi_bridge_atomic_check,
.mode_set = imx8qxp_pxl2dpi_bridge_mode_set,
.atomic_disable = imx8qxp_pxl2dpi_bridge_atomic_disable,
.atomic_get_input_bus_fmts =
imx8qxp_pxl2dpi_bridge_atomic_get_input_bus_fmts,
.atomic_get_output_bus_fmts =
imx8qxp_pxl2dpi_bridge_atomic_get_output_bus_fmts,
};
static struct device_node *
imx8qxp_pxl2dpi_get_available_ep_from_port(struct imx8qxp_pxl2dpi *p2d,
u32 port_id)
{
struct device_node *port, *ep;
int ep_cnt;
port = of_graph_get_port_by_id(p2d->dev->of_node, port_id);
if (!port) {
DRM_DEV_ERROR(p2d->dev, "failed to get port@%u\n", port_id);
return ERR_PTR(-ENODEV);
}
ep_cnt = of_get_available_child_count(port);
if (ep_cnt == 0) {
DRM_DEV_ERROR(p2d->dev, "no available endpoints of port@%u\n",
port_id);
ep = ERR_PTR(-ENODEV);
goto out;
} else if (ep_cnt > 1) {
DRM_DEV_ERROR(p2d->dev,
"invalid available endpoints of port@%u\n",
port_id);
ep = ERR_PTR(-EINVAL);
goto out;
}
ep = of_get_next_available_child(port, NULL);
if (!ep) {
DRM_DEV_ERROR(p2d->dev,
"failed to get available endpoint of port@%u\n",
port_id);
ep = ERR_PTR(-ENODEV);
goto out;
}
out:
of_node_put(port);
return ep;
}
static struct drm_bridge *
imx8qxp_pxl2dpi_find_next_bridge(struct imx8qxp_pxl2dpi *p2d)
{
struct device_node *ep, *remote;
struct drm_bridge *next_bridge;
int ret;
ep = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 1);
if (IS_ERR(ep)) {
ret = PTR_ERR(ep);
return ERR_PTR(ret);
}
remote = of_graph_get_remote_port_parent(ep);
if (!remote || !of_device_is_available(remote)) {
DRM_DEV_ERROR(p2d->dev, "no available remote\n");
next_bridge = ERR_PTR(-ENODEV);
goto out;
} else if (!of_device_is_available(remote->parent)) {
DRM_DEV_ERROR(p2d->dev, "remote parent is not available\n");
next_bridge = ERR_PTR(-ENODEV);
goto out;
}
next_bridge = of_drm_find_bridge(remote);
if (!next_bridge) {
next_bridge = ERR_PTR(-EPROBE_DEFER);
goto out;
}
out:
of_node_put(remote);
of_node_put(ep);
return next_bridge;
}
static int imx8qxp_pxl2dpi_set_pixel_link_sel(struct imx8qxp_pxl2dpi *p2d)
{
struct device_node *ep;
struct of_endpoint endpoint;
int ret;
ep = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 0);
if (IS_ERR(ep))
return PTR_ERR(ep);
ret = of_graph_parse_endpoint(ep, &endpoint);
if (ret) {
DRM_DEV_ERROR(p2d->dev,
"failed to parse endpoint of port@0: %d\n", ret);
goto out;
}
p2d->pl_sel = endpoint.id;
out:
of_node_put(ep);
return ret;
}
static int imx8qxp_pxl2dpi_parse_dt_companion(struct imx8qxp_pxl2dpi *p2d)
{
struct imx8qxp_pxl2dpi *companion_p2d;
struct device *dev = p2d->dev;
struct device_node *companion;
struct device_node *port1, *port2;
const struct of_device_id *match;
int dual_link;
int ret = 0;
/* Locate the companion PXL2DPI for dual-link operation, if any. */
companion = of_parse_phandle(dev->of_node, "fsl,companion-pxl2dpi", 0);
if (!companion)
return 0;
if (!of_device_is_available(companion)) {
DRM_DEV_ERROR(dev, "companion PXL2DPI is not available\n");
ret = -ENODEV;
goto out;
}
/*
* Sanity check: the companion bridge must have the same compatible
* string.
*/
match = of_match_device(dev->driver->of_match_table, dev);
if (!of_device_is_compatible(companion, match->compatible)) {
DRM_DEV_ERROR(dev, "companion PXL2DPI is incompatible\n");
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 void 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);
}
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_new = 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 <[email protected]>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:" DRIVER_NAME);
Codebase Browser
linux