[RFC PATCH 03/17] drm/exynos: dsi: Use the drm_panel_bridge API
Jagan Teki
jagan at amarulasolutions.com
Sun Jul 4 09:02:16 UTC 2021
Use drm_panel_bridge to replace manual panel and
bridge_chain handling code.
This makes the driver simpler to allow all components
in the display pipeline to be treated as bridges by
cleaning the way to generic connector handling.
Signed-off-by: Jagan Teki <jagan at amarulasolutions.com>
---
drivers/gpu/drm/exynos/exynos_drm_dsi.c | 167 ++++--------------------
1 file changed, 23 insertions(+), 144 deletions(-)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index d7d60aee465b..24f0b082ac6d 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
@@ -254,9 +254,6 @@ struct exynos_dsi_driver_data {
struct exynos_dsi {
struct drm_encoder encoder;
struct mipi_dsi_host dsi_host;
- struct drm_connector connector;
- struct drm_panel *panel;
- struct list_head bridge_chain;
struct drm_bridge bridge;
struct drm_bridge *out_bridge;
struct drm_device *drm;
@@ -287,7 +284,6 @@ struct exynos_dsi {
};
#define host_to_dsi(host) container_of(host, struct exynos_dsi, dsi_host)
-#define connector_to_dsi(c) container_of(c, struct exynos_dsi, connector)
static inline struct exynos_dsi *bridge_to_dsi(struct drm_bridge *b)
{
@@ -1379,7 +1375,6 @@ static void exynos_dsi_unregister_te_irq(struct exynos_dsi *dsi)
static void exynos_dsi_bridge_enable(struct drm_bridge *bridge)
{
struct exynos_dsi *dsi = bridge_to_dsi(bridge);
- struct drm_bridge *iter;
int ret;
if (dsi->state & DSIM_STATE_ENABLED)
@@ -1393,134 +1388,51 @@ static void exynos_dsi_bridge_enable(struct drm_bridge *bridge)
dsi->state |= DSIM_STATE_ENABLED;
- if (dsi->panel) {
- ret = drm_panel_prepare(dsi->panel);
- if (ret < 0)
- goto err_put_sync;
- } else {
- list_for_each_entry_reverse(iter, &dsi->bridge_chain,
- chain_node) {
- if (iter->funcs->pre_enable)
- iter->funcs->pre_enable(iter);
- }
- }
-
exynos_dsi_set_display_mode(dsi);
exynos_dsi_set_display_enable(dsi, true);
- if (dsi->panel) {
- ret = drm_panel_enable(dsi->panel);
- if (ret < 0)
- goto err_display_disable;
- } else {
- list_for_each_entry(iter, &dsi->bridge_chain, chain_node) {
- if (iter->funcs->enable)
- iter->funcs->enable(iter);
- }
- }
-
dsi->state |= DSIM_STATE_VIDOUT_AVAILABLE;
return;
-
-err_display_disable:
- exynos_dsi_set_display_enable(dsi, false);
- drm_panel_unprepare(dsi->panel);
-
-err_put_sync:
- dsi->state &= ~DSIM_STATE_ENABLED;
- pm_runtime_put(dsi->dev);
}
static void exynos_dsi_bridge_disable(struct drm_bridge *bridge)
{
struct exynos_dsi *dsi = bridge_to_dsi(bridge);
- struct drm_bridge *iter;
if (!(dsi->state & DSIM_STATE_ENABLED))
return;
dsi->state &= ~DSIM_STATE_VIDOUT_AVAILABLE;
- drm_panel_disable(dsi->panel);
-
- list_for_each_entry_reverse(iter, &dsi->bridge_chain, chain_node) {
- if (iter->funcs->disable)
- iter->funcs->disable(iter);
- }
-
exynos_dsi_set_display_enable(dsi, false);
- drm_panel_unprepare(dsi->panel);
-
- list_for_each_entry(iter, &dsi->bridge_chain, chain_node) {
- if (iter->funcs->post_disable)
- iter->funcs->post_disable(iter);
- }
dsi->state &= ~DSIM_STATE_ENABLED;
pm_runtime_put_sync(dsi->dev);
}
-static enum drm_connector_status
-exynos_dsi_detect(struct drm_connector *connector, bool force)
-{
- return connector->status;
-}
-
-static void exynos_dsi_connector_destroy(struct drm_connector *connector)
+static int exynos_dsi_panel_or_bridge(struct exynos_dsi *dsi,
+ struct device_node *node)
{
- drm_connector_unregister(connector);
- drm_connector_cleanup(connector);
- connector->dev = NULL;
-}
-
-static const struct drm_connector_funcs exynos_dsi_connector_funcs = {
- .detect = exynos_dsi_detect,
- .fill_modes = drm_helper_probe_single_connector_modes,
- .destroy = exynos_dsi_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 int exynos_dsi_get_modes(struct drm_connector *connector)
-{
- struct exynos_dsi *dsi = connector_to_dsi(connector);
-
- if (dsi->panel)
- return drm_panel_get_modes(dsi->panel, connector);
-
- return 0;
-}
+ struct drm_bridge *panel_bridge;
+ struct drm_panel *panel;
-static const struct drm_connector_helper_funcs exynos_dsi_connector_helper_funcs = {
- .get_modes = exynos_dsi_get_modes,
-};
+ panel_bridge = of_drm_find_bridge(node);
+ if (!panel_bridge) {
+ panel = of_drm_find_panel(node);
+ if (!IS_ERR(panel)) {
+ panel_bridge = drm_panel_bridge_add(panel);
+ if (IS_ERR(panel_bridge))
+ return PTR_ERR(panel_bridge);
+ }
+ }
-static int exynos_dsi_create_connector(struct exynos_dsi *dsi,
- struct drm_device *drm)
-{
- struct drm_encoder *encoder = &dsi->encoder;
- struct drm_connector *connector = &dsi->connector;
- int ret;
+ of_node_put(node);
- connector->polled = DRM_CONNECTOR_POLL_HPD;
+ dsi->out_bridge = panel_bridge;
- ret = drm_connector_init(drm, connector, &exynos_dsi_connector_funcs,
- DRM_MODE_CONNECTOR_DSI);
- if (ret) {
- DRM_DEV_ERROR(dsi->dev,
- "Failed to initialize connector with drm\n");
- return ret;
- }
+ if (!dsi->out_bridge)
+ return -EPROBE_DEFER;
- connector->status = connector_status_disconnected;
- drm_connector_helper_add(connector, &exynos_dsi_connector_helper_funcs);
- drm_connector_attach_encoder(connector, encoder);
- if (!drm->registered)
- return 0;
-
- connector->funcs->reset(connector);
- drm_connector_register(connector);
return 0;
}
@@ -1531,7 +1443,8 @@ static int exynos_dsi_bridge_attach(struct drm_bridge *bridge,
dsi->drm = bridge->dev;
- return 0;
+ return drm_bridge_attach(bridge->encoder, dsi->out_bridge, bridge,
+ flags);
}
static const struct drm_bridge_funcs exynos_dsi_bridge_funcs = {
@@ -1546,32 +1459,12 @@ static int exynos_dsi_host_attach(struct mipi_dsi_host *host,
struct mipi_dsi_device *device)
{
struct exynos_dsi *dsi = host_to_dsi(host);
- struct drm_encoder *encoder = &dsi->encoder;
struct drm_device *drm = dsi->drm;
- struct drm_bridge *out_bridge;
-
- out_bridge = of_drm_find_bridge(device->dev.of_node);
- if (out_bridge) {
- drm_bridge_attach(encoder, out_bridge, NULL, 0);
- dsi->out_bridge = out_bridge;
- list_splice_init(&encoder->bridge_chain, &dsi->bridge_chain);
- } else {
- int ret = exynos_dsi_create_connector(dsi, drm);
-
- if (ret) {
- DRM_DEV_ERROR(dsi->dev,
- "failed to create connector ret = %d\n",
- ret);
- drm_encoder_cleanup(encoder);
- return ret;
- }
+ int ret;
- dsi->panel = of_drm_find_panel(device->dev.of_node);
- if (IS_ERR(dsi->panel))
- dsi->panel = NULL;
- else
- dsi->connector.status = connector_status_connected;
- }
+ ret = exynos_dsi_panel_or_bridge(dsi, device->dev.of_node);
+ if (ret)
+ return ret;
/*
* This is a temporary solution and should be made by more generic way.
@@ -1607,19 +1500,6 @@ static int exynos_dsi_host_detach(struct mipi_dsi_host *host,
struct exynos_dsi *dsi = host_to_dsi(host);
struct drm_device *drm = dsi->drm;
- if (dsi->panel) {
- mutex_lock(&drm->mode_config.mutex);
- exynos_dsi_bridge_disable(&dsi->bridge);
- dsi->panel = NULL;
- dsi->connector.status = connector_status_disconnected;
- mutex_unlock(&drm->mode_config.mutex);
- } else {
- if (dsi->out_bridge->funcs->detach)
- dsi->out_bridge->funcs->detach(dsi->out_bridge);
- dsi->out_bridge = NULL;
- INIT_LIST_HEAD(&dsi->bridge_chain);
- }
-
if (drm->mode_config.poll_enabled)
drm_kms_helper_hotplug_event(drm);
@@ -1770,7 +1650,6 @@ static int exynos_dsi_probe(struct platform_device *pdev)
init_completion(&dsi->completed);
spin_lock_init(&dsi->transfer_lock);
INIT_LIST_HEAD(&dsi->transfer_list);
- INIT_LIST_HEAD(&dsi->bridge_chain);
dsi->dsi_host.ops = &exynos_dsi_ops;
dsi->dsi_host.dev = dev;
--
2.25.1
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