Add the bridge support, used by DSI host and HDMI/LVDS bridges.
Signed-off-by: Philippe CORNU philippe.cornu@st.com --- drivers/gpu/drm/stm/ltdc.c | 74 ++++++++++++++++++++++++++++++++++------------ drivers/gpu/drm/stm/ltdc.h | 1 + 2 files changed, 56 insertions(+), 19 deletions(-)
diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c index 7b2d63b..809e420 100644 --- a/drivers/gpu/drm/stm/ltdc.c +++ b/drivers/gpu/drm/stm/ltdc.c @@ -858,6 +858,43 @@ static struct drm_encoder *ltdc_rgb_encoder_create(struct drm_device *ddev) return encoder; }
+static const struct drm_encoder_funcs bridge_encoder_funcs = { + .destroy = drm_encoder_cleanup, +}; + +struct drm_encoder *bridge_encoder_create(struct drm_device *ddev, + struct drm_bridge *bridge) +{ + struct drm_encoder *encoder; + int ret; + + encoder = devm_kzalloc(ddev->dev, sizeof(*encoder), GFP_KERNEL); + if (!encoder) + return NULL; + + encoder->possible_crtcs = CRTC_MASK; + encoder->possible_clones = 0; /* No cloning support */ + + drm_encoder_init(ddev, encoder, &bridge_encoder_funcs, + DRM_MODE_ENCODER_TMDS, NULL); + + drm_encoder_helper_add(encoder, NULL); + + /* Link drm_bridge to encoder */ + bridge->encoder = encoder; + encoder->bridge = bridge; + + ret = drm_bridge_attach(encoder, bridge, NULL); + if (ret) { + drm_encoder_cleanup(encoder); + return NULL; + } + + DRM_DEBUG_DRIVER("Bridge encoder:%d created\n", encoder->base.id); + + return encoder; +} + /* * DRM_CONNECTOR */ @@ -967,12 +1004,13 @@ static int ltdc_get_caps(struct drm_device *ddev) return 0; }
-static struct drm_panel *ltdc_get_panel(struct drm_device *ddev) +static int ltdc_parse_dt(struct drm_device *ddev) { + struct ltdc_device *ldev = ddev->dev_private; struct device *dev = ddev->dev; struct device_node *np = dev->of_node; - struct device_node *entity, *port = NULL; - struct drm_panel *panel = NULL; + struct device_node *entity; + int ret;
DRM_DEBUG_DRIVER("\n");
@@ -985,21 +1023,13 @@ static struct drm_panel *ltdc_get_panel(struct drm_device *ddev) 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); - } - } + ret = drm_of_find_panel_or_bridge(np, 0, 0, + &ldev->panel, &ldev->bridge); + if (ret) + return ret; }
- return panel; + return 0; }
int ltdc_load(struct drm_device *ddev) @@ -1017,9 +1047,9 @@ int ltdc_load(struct drm_device *ddev)
DRM_DEBUG_DRIVER("\n");
- ldev->panel = ltdc_get_panel(ddev); - if (!ldev->panel) - return -EPROBE_DEFER; + ret = ltdc_parse_dt(ddev); + if (ret) + return ret;
rstc = of_reset_control_get(np, NULL);
@@ -1077,6 +1107,12 @@ int ltdc_load(struct drm_device *ddev)
DRM_INFO("ltdc hw version 0x%08x - ready\n", ldev->caps.hw_version);
+ if (ldev->bridge) { + encoder = bridge_encoder_create(ddev, ldev->bridge); + if (!encoder) + return -EINVAL; + } + if (ldev->panel) { encoder = ltdc_rgb_encoder_create(ddev); if (!encoder) { diff --git a/drivers/gpu/drm/stm/ltdc.h b/drivers/gpu/drm/stm/ltdc.h index 5427ef4..0083cad 100644 --- a/drivers/gpu/drm/stm/ltdc.h +++ b/drivers/gpu/drm/stm/ltdc.h @@ -25,6 +25,7 @@ struct ltdc_device { void __iomem *regs; struct clk *pixel_clk; /* lcd pixel clock */ struct drm_panel *panel; + struct drm_bridge *bridge; struct spinlock lock; /* protecting irq status register */ struct ltdc_caps caps; u32 clut[256]; /* color look up table */