We currently get the output connected to LVDS by looking for a phandle called 'qcom,lvds-panel' under the mdp DT node.
Use the more standard of_graph approach to create an lvds output port, and retrieve the panel node from the port's endpoint data.
v3 - Fix return value checks of of_graph_* calls.
Tested-by: Srinivas Kandagatla srinivas.kandagatla@linaro.org Signed-off-by: Archit Taneja architt@codeaurora.org --- drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c | 33 ++++++++++++++++++++++++--------- drivers/gpu/drm/msm/msm_drv.h | 1 + 2 files changed, 25 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c index 531e4ac..601dcc0 100644 --- a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c +++ b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c @@ -241,22 +241,37 @@ int mdp4_enable(struct mdp4_kms *mdp4_kms) }
#ifdef CONFIG_OF -static struct drm_panel *detect_panel(struct drm_device *dev, const char *name) +static struct drm_panel *detect_panel(struct drm_device *dev) { - struct device_node *n; + struct device_node *endpoint, *panel_node; + struct device_node *np = dev->dev->of_node; struct drm_panel *panel = NULL;
- n = of_parse_phandle(dev->dev->of_node, name, 0); - if (n) { - panel = of_drm_find_panel(n); - if (!panel) - panel = ERR_PTR(-EPROBE_DEFER); + endpoint = of_graph_get_next_endpoint(np, NULL); + if (!endpoint) { + dev_err(dev->dev, "no valid endpoint\n"); + return ERR_PTR(-ENODEV); + } + + panel_node = of_graph_get_remote_port_parent(endpoint); + if (!panel_node) { + dev_err(dev->dev, "no valid panel node\n"); + of_node_put(endpoint); + return ERR_PTR(-ENODEV); + } + + of_node_put(endpoint); + + panel = of_drm_find_panel(panel_node); + if (!panel) { + of_node_put(panel_node); + return ERR_PTR(-EPROBE_DEFER); }
return panel; } #else -static struct drm_panel *detect_panel(struct drm_device *dev, const char *name) +static struct drm_panel *detect_panel(struct drm_device *dev) { // ??? maybe use a module param to specify which panel is attached? } @@ -294,7 +309,7 @@ static int modeset_init(struct mdp4_kms *mdp4_kms) * Setup the LCDC/LVDS path: RGB2 -> DMA_P -> LCDC -> LVDS: */
- panel = detect_panel(dev, "qcom,lvds-panel"); + panel = detect_panel(dev); if (IS_ERR(panel)) { ret = PTR_ERR(panel); dev_err(dev->dev, "failed to detect LVDS panel: %d\n", ret); diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h index e7c5ea1..0cbeb1d 100644 --- a/drivers/gpu/drm/msm/msm_drv.h +++ b/drivers/gpu/drm/msm/msm_drv.h @@ -30,6 +30,7 @@ #include <linux/list.h> #include <linux/iommu.h> #include <linux/types.h> +#include <linux/of_graph.h> #include <asm/sizes.h>
#ifndef CONFIG_OF