Dear Yannick, Thank you for your patch, Acked-by: Philippe Cornu philippe.cornu@st.com (sorry for the email format) Philippe :-)
-----Original Message----- From: Yannick FERTRE yannick.fertre@st.com Sent: Friday, February 28, 2020 09:08 To: Yannick FERTRE yannick.fertre@st.com; Philippe CORNU philippe.cornu@st.com; Benjamin GAIGNARD benjamin.gaignard@st.com; David Airlie airlied@linux.ie; Daniel Vetter daniel@ffwll.ch; Maxime Coquelin mcoquelin.stm32@gmail.com; Alexandre TORGUE alexandre.torgue@st.com; dri-devel@lists.freedesktop.org; linux-stm32@st-md-mailman.stormreply.com; linux-arm-kernel@lists.infradead.org; linux-kernel@vger.kernel.org Subject: [PATCH] drm/stm: ltdc: check number of endpoints
Number of endpoints could exceed the fix value MAX_ENDPOINTS(2). Instead of increase simply this value, the number of endpoint could be read from device tree. Load sequence has been a little rework to take care of several panel or bridge which can be connected/disconnected or enable/disable.
Signed-off-by: Yannick Fertre yannick.fertre@st.com --- drivers/gpu/drm/stm/ltdc.c | 102 +++++++++++++++++++++++---------------------- 1 file changed, 52 insertions(+), 50 deletions(-)
diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c index df585fe..f894968 100644 --- a/drivers/gpu/drm/stm/ltdc.c +++ b/drivers/gpu/drm/stm/ltdc.c @@ -42,8 +42,6 @@
#define MAX_IRQ 4
-#define MAX_ENDPOINTS 2 - #define HWVER_10200 0x010200 #define HWVER_10300 0x010300 #define HWVER_20101 0x020101 @@ -1201,36 +1199,20 @@ 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[MAX_ENDPOINTS] = {NULL}; - struct drm_panel *panel[MAX_ENDPOINTS] = {NULL}; + struct drm_bridge *bridge; + struct drm_panel *panel; struct drm_crtc *crtc; struct reset_control *rstc; struct resource *res; - int irq, ret, i, endpoint_not_ready = -ENODEV; + int irq, i, nb_endpoints; + int ret = -ENODEV;
DRM_DEBUG_DRIVER("\n");
- /* 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 -EPROBE_DEFER, defer probing, - * else if at least one endpoint is ready, continue probing. - */ - if (ret == -EPROBE_DEFER) - return ret; - else if (!ret) - endpoint_not_ready = 0; - } - - if (endpoint_not_ready) - return endpoint_not_ready; - - rstc = devm_reset_control_get_exclusive(dev, NULL); - - mutex_init(&ldev->err_lock); + /* Get number of endpoints */ + nb_endpoints = of_graph_get_endpoint_count(np); + if (!nb_endpoints) + return -ENODEV;
ldev->pixel_clk = devm_clk_get(dev, "lcd"); if (IS_ERR(ldev->pixel_clk)) { @@ -1244,6 +1226,43 @@ int ltdc_load(struct drm_device *ddev) return -ENODEV; }
+ /* Get endpoints if any */ + for (i = 0; i < nb_endpoints; i++) { + ret = drm_of_find_panel_or_bridge(np, 0, i, &panel, &bridge); + + /* + * If at least one endpoint is -ENODEV, continue probing, + * else if at least one endpoint returned an error + * (ie -EPROBE_DEFER) then stop probing. + */ + if (ret == -ENODEV) + continue; + else if (ret) + goto err; + + if (panel) { + bridge = drm_panel_bridge_add_typed(panel, + DRM_MODE_CONNECTOR_DPI); + if (IS_ERR(bridge)) { + DRM_ERROR("panel-bridge endpoint %d\n", i); + ret = PTR_ERR(bridge); + goto err; + } + } + + if (bridge) { + ret = ltdc_encoder_init(ddev, bridge); + if (ret) { + DRM_ERROR("init encoder endpoint %d\n", i); + goto err; + } + } + } + + rstc = devm_reset_control_get_exclusive(dev, NULL); + + mutex_init(&ldev->err_lock); + if (!IS_ERR(rstc)) { reset_control_assert(rstc); usleep_range(10, 20); @@ -1285,27 +1304,7 @@ int ltdc_load(struct drm_device *ddev) DRM_ERROR("Failed to register LTDC interrupt\n"); 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_typed(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; - } - } - - 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); @@ -1340,8 +1339,8 @@ int ltdc_load(struct drm_device *ddev)
return 0; err: - for (i = 0; i < MAX_ENDPOINTS; i++) - drm_panel_bridge_remove(bridge[i]); + for (i = 0; i < nb_endpoints; i++) + drm_of_panel_bridge_remove(ddev->dev->of_node, 0, i);
clk_disable_unprepare(ldev->pixel_clk);
@@ -1350,11 +1349,14 @@ int ltdc_load(struct drm_device *ddev)
void ltdc_unload(struct drm_device *ddev) { - int i; + struct device *dev = ddev->dev; + int nb_endpoints, i;
DRM_DEBUG_DRIVER("\n");
- for (i = 0; i < MAX_ENDPOINTS; i++) + nb_endpoints = of_graph_get_endpoint_count(dev->of_node); + + for (i = 0; i < nb_endpoints; i++) drm_of_panel_bridge_remove(ddev->dev->of_node, 0, i);
pm_runtime_disable(ddev->dev); -- 2.7.4