[PATCH v4 1/6] drm/stm: ltdc: Add panel-bridge support
Philippe CORNU
philippe.cornu at st.com
Mon Jun 19 09:28:00 PDT 2017
Add the panel-bridge support for both panels & bridges (used by DSI host &
HDMI/LVDS bridges).
Signed-off-by: Philippe CORNU <philippe.cornu at st.com>
---
drivers/gpu/drm/stm/Kconfig | 2 +-
drivers/gpu/drm/stm/ltdc.c | 211 ++++++++------------------------------------
drivers/gpu/drm/stm/ltdc.h | 3 +-
3 files changed, 38 insertions(+), 178 deletions(-)
diff --git a/drivers/gpu/drm/stm/Kconfig b/drivers/gpu/drm/stm/Kconfig
index 2c4817f..4b88223 100644
--- a/drivers/gpu/drm/stm/Kconfig
+++ b/drivers/gpu/drm/stm/Kconfig
@@ -4,7 +4,7 @@ config DRM_STM
select DRM_KMS_HELPER
select DRM_GEM_CMA_HELPER
select DRM_KMS_CMA_HELPER
- select DRM_PANEL
+ select DRM_PANEL_BRIDGE
select VIDEOMODE_HELPERS
select FB_PROVIDE_GET_FB_UNMAPPED_AREA
default y
diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
index 1b9483d..8aa0586 100644
--- a/drivers/gpu/drm/stm/ltdc.c
+++ b/drivers/gpu/drm/stm/ltdc.c
@@ -21,7 +21,7 @@
#include <drm/drm_fb_cma_helper.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_of.h>
-#include <drm/drm_panel.h>
+#include <drm/drm_bridge.h>
#include <drm/drm_plane_helper.h>
#include <video/videomode.h>
@@ -269,11 +269,6 @@ static inline struct ltdc_device *encoder_to_ltdc(struct drm_encoder *enc)
return (struct ltdc_device *)enc->dev->dev_private;
}
-static inline struct ltdc_device *connector_to_ltdc(struct drm_connector *con)
-{
- return (struct ltdc_device *)con->dev->dev_private;
-}
-
static inline enum ltdc_pix_fmt to_ltdc_pixelformat(u32 drm_fmt)
{
enum ltdc_pix_fmt pf;
@@ -813,130 +808,35 @@ static int ltdc_crtc_init(struct drm_device *ddev, struct drm_crtc *crtc)
* DRM_ENCODER
*/
-static void ltdc_rgb_encoder_enable(struct drm_encoder *encoder)
-{
- struct ltdc_device *ldev = encoder_to_ltdc(encoder);
-
- DRM_DEBUG_DRIVER("\n");
-
- drm_panel_prepare(ldev->panel);
- drm_panel_enable(ldev->panel);
-}
-
-static void ltdc_rgb_encoder_disable(struct drm_encoder *encoder)
-{
- struct ltdc_device *ldev = encoder_to_ltdc(encoder);
-
- DRM_DEBUG_DRIVER("\n");
-
- drm_panel_disable(ldev->panel);
- drm_panel_unprepare(ldev->panel);
-}
-
-static const struct drm_encoder_helper_funcs ltdc_rgb_encoder_helper_funcs = {
- .enable = ltdc_rgb_encoder_enable,
- .disable = ltdc_rgb_encoder_disable,
-};
-
-static const struct drm_encoder_funcs ltdc_rgb_encoder_funcs = {
+static const struct drm_encoder_funcs ltdc_encoder_funcs = {
.destroy = drm_encoder_cleanup,
};
-static struct drm_encoder *ltdc_rgb_encoder_create(struct drm_device *ddev)
+static int ltdc_encoder_init(struct drm_device *ddev)
{
+ struct ltdc_device *ldev = ddev->dev_private;
struct drm_encoder *encoder;
+ int ret;
encoder = devm_kzalloc(ddev->dev, sizeof(*encoder), GFP_KERNEL);
if (!encoder)
- return NULL;
+ return -ENOMEM;
encoder->possible_crtcs = CRTC_MASK;
encoder->possible_clones = 0; /* No cloning support */
- drm_encoder_init(ddev, encoder, <dc_rgb_encoder_funcs,
+ drm_encoder_init(ddev, encoder, <dc_encoder_funcs,
DRM_MODE_ENCODER_DPI, NULL);
- drm_encoder_helper_add(encoder, <dc_rgb_encoder_helper_funcs);
-
- DRM_DEBUG_DRIVER("RGB encoder:%d created\n", encoder->base.id);
-
- return encoder;
-}
-
-/*
- * DRM_CONNECTOR
- */
-
-static int ltdc_rgb_connector_get_modes(struct drm_connector *connector)
-{
- struct drm_device *ddev = connector->dev;
- struct ltdc_device *ldev = ddev->dev_private;
- int ret = 0;
-
- DRM_DEBUG_DRIVER("\n");
-
- if (ldev->panel)
- ret = drm_panel_get_modes(ldev->panel);
-
- return ret < 0 ? 0 : ret;
-}
-
-static struct drm_connector_helper_funcs ltdc_rgb_connector_helper_funcs = {
- .get_modes = ltdc_rgb_connector_get_modes,
-};
-
-static enum drm_connector_status
-ltdc_rgb_connector_detect(struct drm_connector *connector, bool force)
-{
- struct ltdc_device *ldev = connector_to_ltdc(connector);
-
- return ldev->panel ? connector_status_connected :
- connector_status_disconnected;
-}
-
-static void ltdc_rgb_connector_destroy(struct drm_connector *connector)
-{
- DRM_DEBUG_DRIVER("\n");
-
- drm_connector_unregister(connector);
- drm_connector_cleanup(connector);
-}
-
-static const struct drm_connector_funcs ltdc_rgb_connector_funcs = {
- .dpms = drm_atomic_helper_connector_dpms,
- .fill_modes = drm_helper_probe_single_connector_modes,
- .detect = ltdc_rgb_connector_detect,
- .destroy = ltdc_rgb_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,
-};
-
-struct drm_connector *ltdc_rgb_connector_create(struct drm_device *ddev)
-{
- struct drm_connector *connector;
- int err;
-
- connector = devm_kzalloc(ddev->dev, sizeof(*connector), GFP_KERNEL);
- if (!connector) {
- DRM_ERROR("Failed to allocate connector\n");
- return NULL;
- }
-
- connector->polled = DRM_CONNECTOR_POLL_HPD;
-
- err = drm_connector_init(ddev, connector, <dc_rgb_connector_funcs,
- DRM_MODE_CONNECTOR_DPI);
- if (err) {
- DRM_ERROR("Failed to initialize connector\n");
- return NULL;
+ ret = drm_bridge_attach(encoder, ldev->bridge, NULL);
+ if (ret) {
+ drm_encoder_cleanup(encoder);
+ return -EINVAL;
}
- drm_connector_helper_add(connector, <dc_rgb_connector_helper_funcs);
-
- DRM_DEBUG_DRIVER("RGB connector:%d created\n", connector->base.id);
+ DRM_DEBUG_DRIVER("Bridge encoder:%d created\n", encoder->base.id);
- return connector;
+ return 0;
}
static int ltdc_get_caps(struct drm_device *ddev)
@@ -972,49 +872,14 @@ static int ltdc_get_caps(struct drm_device *ddev)
return 0;
}
-static struct drm_panel *ltdc_get_panel(struct drm_device *ddev)
-{
- struct device *dev = ddev->dev;
- struct device_node *np = dev->of_node;
- struct device_node *entity, *port = NULL;
- struct drm_panel *panel = NULL;
-
- DRM_DEBUG_DRIVER("\n");
-
- /*
- * Parse ltdc node to get remote port and find RGB panel / HDMI slave
- * If a dsi or a bridge (hdmi, lvds...) is connected to ltdc,
- * a remote port & RGB panel will not be found.
- */
- for_each_endpoint_of_node(np, entity) {
- if (!of_device_is_available(entity))
- continue;
-
- port = of_graph_get_remote_port_parent(entity);
- if (port) {
- panel = of_drm_find_panel(port);
- of_node_put(port);
- if (panel) {
- DRM_DEBUG_DRIVER("remote panel %s\n",
- port->full_name);
- } else {
- DRM_DEBUG_DRIVER("panel missing\n");
- of_node_put(entity);
- }
- }
- }
-
- return panel;
-}
-
int ltdc_load(struct drm_device *ddev)
{
struct platform_device *pdev = to_platform_device(ddev->dev);
struct ltdc_device *ldev = ddev->dev_private;
struct device *dev = ddev->dev;
struct device_node *np = dev->of_node;
- struct drm_encoder *encoder;
- struct drm_connector *connector = NULL;
+ struct drm_bridge *bridge;
+ struct drm_panel *panel;
struct drm_crtc *crtc;
struct reset_control *rstc;
struct resource res;
@@ -1022,9 +887,9 @@ int ltdc_load(struct drm_device *ddev)
DRM_DEBUG_DRIVER("\n");
- ldev->panel = ltdc_get_panel(ddev);
- if (!ldev->panel)
- return -EPROBE_DEFER;
+ ret = drm_of_find_panel_or_bridge(np, 0, 0, &panel, &bridge);
+ if (ret)
+ return ret;
rstc = of_reset_control_get(np, NULL);
@@ -1082,28 +947,21 @@ int ltdc_load(struct drm_device *ddev)
DRM_INFO("ltdc hw version 0x%08x - ready\n", ldev->caps.hw_version);
- if (ldev->panel) {
- encoder = ltdc_rgb_encoder_create(ddev);
- if (!encoder) {
- DRM_ERROR("Failed to create RGB encoder\n");
- ret = -EINVAL;
- goto err;
+ if (panel) {
+ bridge = drm_panel_bridge_add(panel, DRM_MODE_CONNECTOR_DPI);
+ if (IS_ERR(bridge)) {
+ DRM_ERROR("Failed to create panel-bridge\n");
+ return PTR_ERR(bridge);
}
+ ldev->is_panel_bridge = true;
+ }
- connector = ltdc_rgb_connector_create(ddev);
- if (!connector) {
- DRM_ERROR("Failed to create RGB connector\n");
- ret = -EINVAL;
- goto err;
- }
+ ldev->bridge = bridge;
- ret = drm_mode_connector_attach_encoder(connector, encoder);
- if (ret) {
- DRM_ERROR("Failed to attach connector to encoder\n");
- goto err;
- }
-
- drm_panel_attach(ldev->panel, connector);
+ ret = ltdc_encoder_init(ddev);
+ if (ret) {
+ DRM_ERROR("Failed to init encoder\n");
+ goto err;
}
crtc = devm_kzalloc(dev, sizeof(*crtc), GFP_KERNEL);
@@ -1129,9 +987,10 @@ int ltdc_load(struct drm_device *ddev)
ddev->irq_enabled = 1;
return 0;
+
err:
- if (ldev->panel)
- drm_panel_detach(ldev->panel);
+ if (ldev->is_panel_bridge)
+ drm_panel_bridge_remove(bridge);
clk_disable_unprepare(ldev->pixel_clk);
@@ -1144,8 +1003,8 @@ void ltdc_unload(struct drm_device *ddev)
DRM_DEBUG_DRIVER("\n");
- if (ldev->panel)
- drm_panel_detach(ldev->panel);
+ if (ldev->is_panel_bridge)
+ drm_panel_bridge_remove(ldev->bridge);
clk_disable_unprepare(ldev->pixel_clk);
}
diff --git a/drivers/gpu/drm/stm/ltdc.h b/drivers/gpu/drm/stm/ltdc.h
index d7a9c73..d9e899d 100644
--- a/drivers/gpu/drm/stm/ltdc.h
+++ b/drivers/gpu/drm/stm/ltdc.h
@@ -24,7 +24,8 @@ struct ltdc_device {
struct drm_fbdev_cma *fbdev;
void __iomem *regs;
struct clk *pixel_clk; /* lcd pixel clock */
- struct drm_panel *panel;
+ struct drm_bridge *bridge;
+ bool is_panel_bridge;
struct mutex err_lock; /* protecting error_status */
struct ltdc_caps caps;
u32 clut[256]; /* color look up table */
--
1.9.1
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