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drm/bridge: tc358764: restore connector support

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This patch restores DRM connector registration in the TC358764 bridge
driver and restores usage of the old drm_panel_* API, thus allows dynamic
panel registration. This fixes panel operation on Exynos5250-based
Arndale board.

This is equivalent to the revert of the following commits:
1644127f83bc "drm/bridge: tc358764: add drm_panel_bridge support"
385ca38da29c "drm/bridge: tc358764: drop drm_connector_(un)register"
and removal of the calls to drm_panel_attach()/drm_panel_detach(), which
were no-ops and has been removed in meanwhile.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200930114042.5806-1-m.szyprowski@samsung.com
This commit is contained in:
Marek Szyprowski 2020-09-30 13:40:42 +02:00 committed by Andrzej Hajda
parent f3d52908f6
commit dac4ec775a
1 changed files with 92 additions and 15 deletions
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107
drivers/gpu/drm/bridge/tc358764.c
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@ -153,9 +153,10 @@ static const char * const tc358764_supplies[] = {
struct tc358764 {
struct device *dev;
struct drm_bridge bridge;
struct drm_connector connector;
struct regulator_bulk_data supplies[ARRAY_SIZE(tc358764_supplies)];
struct gpio_desc *gpio_reset;
struct drm_bridge *panel_bridge;
struct drm_panel *panel;
int error;
};
@ -209,6 +210,12 @@ static inline struct tc358764 *bridge_to_tc358764(struct drm_bridge *bridge)
return container_of(bridge, struct tc358764, bridge);
}
static inline
struct tc358764 *connector_to_tc358764(struct drm_connector *connector)
{
return container_of(connector, struct tc358764, connector);
}
static int tc358764_init(struct tc358764 *ctx)
{
u32 v = 0;
@ -271,11 +278,43 @@ static void tc358764_reset(struct tc358764 *ctx)
usleep_range(1000, 2000);
}
static int tc358764_get_modes(struct drm_connector *connector)
{
struct tc358764 *ctx = connector_to_tc358764(connector);
return drm_panel_get_modes(ctx->panel, connector);
}
static const
struct drm_connector_helper_funcs tc358764_connector_helper_funcs = {
.get_modes = tc358764_get_modes,
};
static const struct drm_connector_funcs tc358764_connector_funcs = {
.fill_modes = drm_helper_probe_single_connector_modes,
.destroy = drm_connector_cleanup,
.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 void tc358764_disable(struct drm_bridge *bridge)
{
struct tc358764 *ctx = bridge_to_tc358764(bridge);
int ret = drm_panel_disable(bridge_to_tc358764(bridge)->panel);
if (ret < 0)
dev_err(ctx->dev, "error disabling panel (%d)\n", ret);
}
static void tc358764_post_disable(struct drm_bridge *bridge)
{
struct tc358764 *ctx = bridge_to_tc358764(bridge);
int ret;
ret = drm_panel_unprepare(ctx->panel);
if (ret < 0)
dev_err(ctx->dev, "error unpreparing panel (%d)\n", ret);
tc358764_reset(ctx);
usleep_range(10000, 15000);
ret = regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
@ -296,28 +335,71 @@ static void tc358764_pre_enable(struct drm_bridge *bridge)
ret = tc358764_init(ctx);
if (ret < 0)
dev_err(ctx->dev, "error initializing bridge (%d)\n", ret);
ret = drm_panel_prepare(ctx->panel);
if (ret < 0)
dev_err(ctx->dev, "error preparing panel (%d)\n", ret);
}
static void tc358764_enable(struct drm_bridge *bridge)
{
struct tc358764 *ctx = bridge_to_tc358764(bridge);
int ret = drm_panel_enable(ctx->panel);
if (ret < 0)
dev_err(ctx->dev, "error enabling panel (%d)\n", ret);
}
static int tc358764_attach(struct drm_bridge *bridge,
enum drm_bridge_attach_flags flags)
{
struct tc358764 *ctx = bridge_to_tc358764(bridge);
struct drm_device *drm = bridge->dev;
int ret;
return drm_bridge_attach(bridge->encoder, ctx->panel_bridge,
bridge, flags);
if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
DRM_ERROR("Fix bridge driver to make connector optional!");
return -EINVAL;
}
ctx->connector.polled = DRM_CONNECTOR_POLL_HPD;
ret = drm_connector_init(drm, &ctx->connector,
&tc358764_connector_funcs,
DRM_MODE_CONNECTOR_LVDS);
if (ret) {
DRM_ERROR("Failed to initialize connector\n");
return ret;
}
drm_connector_helper_add(&ctx->connector,
&tc358764_connector_helper_funcs);
drm_connector_attach_encoder(&ctx->connector, bridge->encoder);
ctx->connector.funcs->reset(&ctx->connector);
drm_connector_register(&ctx->connector);
return 0;
}
static void tc358764_detach(struct drm_bridge *bridge)
{
struct tc358764 *ctx = bridge_to_tc358764(bridge);
drm_connector_unregister(&ctx->connector);
ctx->panel = NULL;
drm_connector_put(&ctx->connector);
}
static const struct drm_bridge_funcs tc358764_bridge_funcs = {
.disable = tc358764_disable,
.post_disable = tc358764_post_disable,
.enable = tc358764_enable,
.pre_enable = tc358764_pre_enable,
.attach = tc358764_attach,
.detach = tc358764_detach,
};
static int tc358764_parse_dt(struct tc358764 *ctx)
{
struct drm_bridge *panel_bridge;
struct device *dev = ctx->dev;
struct drm_panel *panel;
int ret;
ctx->gpio_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
@ -326,16 +408,12 @@ static int tc358764_parse_dt(struct tc358764 *ctx)
return PTR_ERR(ctx->gpio_reset);
}
ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &panel, NULL);
if (ret)
return ret;
ret = drm_of_find_panel_or_bridge(ctx->dev->of_node, 1, 0, &ctx->panel,
NULL);
if (ret && ret != -EPROBE_DEFER)
dev_err(dev, "cannot find panel (%d)\n", ret);
panel_bridge = devm_drm_panel_bridge_add(dev, panel);
if (IS_ERR(panel_bridge))
return PTR_ERR(panel_bridge);
ctx->panel_bridge = panel_bridge;
return 0;
return ret;
}
static int tc358764_configure_regulators(struct tc358764 *ctx)
@ -381,7 +459,6 @@ static int tc358764_probe(struct mipi_dsi_device *dsi)
return ret;
ctx->bridge.funcs = &tc358764_bridge_funcs;
ctx->bridge.type = DRM_MODE_CONNECTOR_LVDS;
ctx->bridge.of_node = dev->of_node;
drm_bridge_add(&ctx->bridge);