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author | Philippe CORNU <philippe.cornu@st.com> | 2017-10-26 13:48:09 +0200 |
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committer | Benjamin Gaignard <benjamin.gaignard@linaro.org> | 2017-11-07 14:47:39 +0100 |
commit | c188d7ebbebd0b21a071777ac937c0743e2e7a64 (patch) | |
tree | 5232482b49a99120e1589ecb4a696790a9bb5a38 /drivers/gpu/drm/stm | |
parent | 2ac9d363376a3bae4854ddc1089442d63bf6c3b0 (diff) | |
download | linux-c188d7ebbebd0b21a071777ac937c0743e2e7a64.tar.gz linux-c188d7ebbebd0b21a071777ac937c0743e2e7a64.tar.bz2 linux-c188d7ebbebd0b21a071777ac937c0743e2e7a64.zip |
drm/stm: ltdc: add a 2nd endpoint
ltdc can have up to 2 endpoints:
- dpi external gpios: for rgb panels or external bridge ICs.
- dpi internal ios: connected internally to dsi.
Note: Refer to the reference manual to know if the dsi is
present on your device.
Signed-off-by: Philippe Cornu <philippe.cornu@st.com>
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1509018489-19641-3-git-send-email-philippe.cornu@st.com
Diffstat (limited to 'drivers/gpu/drm/stm')
-rw-r--r-- | drivers/gpu/drm/stm/ltdc.c | 64 |
1 files changed, 45 insertions, 19 deletions
diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c index 7be6710a2450..35e884239f60 100644 --- a/drivers/gpu/drm/stm/ltdc.c +++ b/drivers/gpu/drm/stm/ltdc.c @@ -33,6 +33,8 @@ #define MAX_IRQ 4 +#define MAX_ENDPOINTS 2 + #define HWVER_10200 0x010200 #define HWVER_10300 0x010300 #define HWVER_20101 0x020101 @@ -856,18 +858,33 @@ int ltdc_load(struct drm_device *ddev) struct ltdc_device *ldev = ddev->dev_private; struct device *dev = ddev->dev; struct device_node *np = dev->of_node; - struct drm_bridge *bridge; - struct drm_panel *panel; + struct drm_bridge *bridge[MAX_ENDPOINTS] = {NULL}; + struct drm_panel *panel[MAX_ENDPOINTS] = {NULL}; struct drm_crtc *crtc; struct reset_control *rstc; struct resource *res; - int irq, ret, i; + int irq, ret, i, endpoint_not_ready = -ENODEV; DRM_DEBUG_DRIVER("\n"); - ret = drm_of_find_panel_or_bridge(np, 0, 0, &panel, &bridge); - if (ret) - return ret; + /* Get endpoints if any */ + for (i = 0; i < MAX_ENDPOINTS; i++) { + ret = drm_of_find_panel_or_bridge(np, 0, i, &panel[i], + &bridge[i]); + + /* + * If at least one endpoint is ready, continue probing, + * else if at least one endpoint is -EPROBE_DEFER and + * there is no previous ready endpoints, defer probing. + */ + if (!ret) + endpoint_not_ready = 0; + else if (ret == -EPROBE_DEFER && endpoint_not_ready) + endpoint_not_ready = -EPROBE_DEFER; + } + + if (endpoint_not_ready) + return endpoint_not_ready; rstc = devm_reset_control_get_exclusive(dev, NULL); @@ -928,19 +945,25 @@ int ltdc_load(struct drm_device *ddev) DRM_INFO("ltdc hw version 0x%08x - ready\n", ldev->caps.hw_version); - if (panel) { - bridge = drm_panel_bridge_add(panel, DRM_MODE_CONNECTOR_DPI); - if (IS_ERR(bridge)) { - DRM_ERROR("Failed to create panel-bridge\n"); - ret = PTR_ERR(bridge); - goto err; + /* Add endpoints panels or bridges if any */ + for (i = 0; i < MAX_ENDPOINTS; i++) { + if (panel[i]) { + bridge[i] = drm_panel_bridge_add(panel[i], + DRM_MODE_CONNECTOR_DPI); + if (IS_ERR(bridge[i])) { + DRM_ERROR("panel-bridge endpoint %d\n", i); + ret = PTR_ERR(bridge[i]); + goto err; + } } - } - ret = ltdc_encoder_init(ddev, bridge); - if (ret) { - DRM_ERROR("Failed to init encoder\n"); - goto err; + if (bridge[i]) { + ret = ltdc_encoder_init(ddev, bridge[i]); + if (ret) { + DRM_ERROR("init encoder endpoint %d\n", i); + goto err; + } + } } crtc = devm_kzalloc(dev, sizeof(*crtc), GFP_KERNEL); @@ -968,7 +991,8 @@ int ltdc_load(struct drm_device *ddev) return 0; err: - drm_panel_bridge_remove(bridge); + for (i = 0; i < MAX_ENDPOINTS; i++) + drm_panel_bridge_remove(bridge[i]); clk_disable_unprepare(ldev->pixel_clk); @@ -978,10 +1002,12 @@ err: void ltdc_unload(struct drm_device *ddev) { struct ltdc_device *ldev = ddev->dev_private; + int i; DRM_DEBUG_DRIVER("\n"); - drm_of_panel_bridge_remove(ddev->dev->of_node, 0, 0); + for (i = 0; i < MAX_ENDPOINTS; i++) + drm_of_panel_bridge_remove(ddev->dev->of_node, 0, i); clk_disable_unprepare(ldev->pixel_clk); } |