Hi Nikolaus,
Le lun., janv. 31 2022 at 13:26:53 +0100, H. Nikolaus Schaller
<hns@xxxxxxxxxxxxx> a écrit :
"hdmi-connector.yaml" bindings defines an optional property
"ddc-en-gpios" for a single gpio to enable DDC operation.
Usually this controls +5V power on the HDMI connector.
This +5V may also be needed for HPD.
This was not reflected in code.
Now, the driver activates the ddc gpio after probe and
deactivates after remove so it is "almost on".
But only if this driver is loaded (and not e.g. blacklisted
as module).
Signed-off-by: H. Nikolaus Schaller <hns@xxxxxxxxxxxxx>
---
drivers/gpu/drm/bridge/display-connector.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/drivers/gpu/drm/bridge/display-connector.c
b/drivers/gpu/drm/bridge/display-connector.c
index d24f5b90feabf..555395e301096 100644
--- a/drivers/gpu/drm/bridge/display-connector.c
+++ b/drivers/gpu/drm/bridge/display-connector.c
@@ -24,6 +24,7 @@ struct display_connector {
int hpd_irq;
struct regulator *dp_pwr;
+ struct gpio_desc *ddc_en;
};
static inline struct display_connector *
@@ -345,6 +346,19 @@ static int display_connector_probe(struct
platform_device *pdev)
}
}
+ /* enable DDC */
+ if (type == DRM_MODE_CONNECTOR_HDMIA) {
+ conn->ddc_en = devm_gpiod_get_optional(&pdev->dev, "ddc-en",
+ GPIOD_OUT_HIGH);
+
+ if (IS_ERR(conn->ddc_en)) {
+ dev_err(&pdev->dev, "Couldn't get ddc-en gpio\n");
+ return PTR_ERR(conn->ddc_en);
+ }
+
+ gpiod_set_value(conn->ddc_en, 1);
You already requested the gpio with the GPIOD_OUT_HIGH flag, so this
can be removed.
+ }
+
conn->bridge.funcs = &display_connector_bridge_funcs;
conn->bridge.of_node = pdev->dev.of_node;
@@ -373,6 +387,9 @@ static int display_connector_remove(struct
platform_device *pdev)
{
struct display_connector *conn = platform_get_drvdata(pdev);
+ if (conn->ddc_en)
+ gpiod_set_value(conn->ddc_en, 0);
Note that gpiod_set_value() already does the null-check internally. I
actually do prefer your solution, so this is fine with me, but
maintainers may have a different opinion.
Cheers,
-Paul
+
if (conn->dp_pwr)
regulator_disable(conn->dp_pwr);
--
2.33.0
