Hi Stephen,
Reviving a bit of an old thread, for a question.
On Mon, Nov 02, 2020 at 10:11:43AM -0800, Stephen Boyd wrote:
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@chromium.org Reviewed-by: Laurent Pinchart Laurent.pinchart@ideasonboard.com Cc: Jonas Karlman jonas@kwiboo.se Cc: Jernej Skrabec jernej.skrabec@siol.net Cc: Sean Paul seanpaul@chromium.org Acked-by: Sam Ravnborg sam@ravnborg.org Signed-off-by: Stephen Boyd swboyd@chromium.org
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);
Is there any specific reason to use the indirect access method, compared to the direct method that translates access to an I2C ancillary address to an I2C-over-AUX transaction (see page 20 of SLLSEH2B) ? The direct method seems it would be more efficient.
}
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);