Use the DDC connection to read the EDID from the eDP panel instead of
relying on the panel to tell us the modes.
Reviewed-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
Reviewed-by: Laurent Pinchart <Laurent.pinchart@xxxxxxxxxxxxxxxx>
Cc: Jonas Karlman <jonas@xxxxxxxxx>
Cc: Jernej Skrabec <jernej.skrabec@xxxxxxxx>
Cc: Sean Paul <seanpaul@xxxxxxxxxxxx>
Acked-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
Signed-off-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>
---
drivers/gpu/drm/bridge/ti-sn65dsi86.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
index 8276fa50138f..6b6e98ca2881 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -119,6 +119,7 @@
* @debugfs: Used for managing our debugfs.
* @host_node: Remote DSI node.
* @dsi: Our MIPI DSI source.
+ * @edid: Detected EDID of eDP panel.
* @refclk: Our reference clock.
* @panel: Our panel.
* @enable_gpio: The GPIO we toggle to enable the bridge.
@@ -144,6 +145,7 @@ struct ti_sn_bridge {
struct drm_bridge bridge;
struct drm_connector connector;
struct dentry *debugfs;
+ struct edid *edid;
struct device_node *host_node;
struct mipi_dsi_device *dsi;
struct clk *refclk;
@@ -265,6 +267,23 @@ connector_to_ti_sn_bridge(struct drm_connector *connector)
static int ti_sn_bridge_connector_get_modes(struct drm_connector *connector)
{
struct ti_sn_bridge *pdata = connector_to_ti_sn_bridge(connector);
+ struct edid *edid = pdata->edid;
+ int num, ret;
+
+ if (!edid) {
+ pm_runtime_get_sync(pdata->dev);
+ edid = pdata->edid = drm_get_edid(connector, &pdata->aux.ddc);
+ pm_runtime_put(pdata->dev);
+ }
+
+ if (edid && drm_edid_is_valid(edid)) {
+ ret = drm_connector_update_edid_property(connector, edid);
+ if (!ret) {
+ num = drm_add_edid_modes(connector, edid);
+ if (num)
+ return num;
+ }
+ }
return drm_panel_get_modes(pdata->panel, connector);
}
@@ -1245,6 +1264,7 @@ static int ti_sn_bridge_remove(struct i2c_client *client)
if (!pdata)
return -EINVAL;
+ kfree(pdata->edid);
ti_sn_debugfs_remove(pdata);
of_node_put(pdata->host_node);
--
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