diff mbox series

[v3,08/21] drm/bridge: tc358767: add get_edid bride operation

Message ID 20200703192417.372164-9-sam@ravnborg.org (mailing list archive)
State New, archived
Headers show
Series drm/bridge: support chained bridges + panel updates | expand

Commit Message

Sam Ravnborg July 3, 2020, 7:24 p.m. UTC
Prepare for chained bridge with the addition of
get_edid support.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Andrzej Hajda <a.hajda@samsung.com>
Cc: Neil Armstrong <narmstrong@baylibre.com>
Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
Cc: Jonas Karlman <jonas@kwiboo.se>
Cc: Jernej Skrabec <jernej.skrabec@siol.net>
---
 drivers/gpu/drm/bridge/tc358767.c | 24 +++++++++++++++++-------
 1 file changed, 17 insertions(+), 7 deletions(-)

Comments

Laurent Pinchart July 10, 2020, 10:24 p.m. UTC | #1
Hi Sam,

Thank you for the patch.

s/bride/bridge/ in the subject line.

On Fri, Jul 03, 2020 at 09:24:04PM +0200, Sam Ravnborg wrote:
> Prepare for chained bridge with the addition of
> get_edid support.
> 
> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
> Cc: Andrzej Hajda <a.hajda@samsung.com>
> Cc: Neil Armstrong <narmstrong@baylibre.com>
> Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
> Cc: Jonas Karlman <jonas@kwiboo.se>
> Cc: Jernej Skrabec <jernej.skrabec@siol.net>
> ---
>  drivers/gpu/drm/bridge/tc358767.c | 24 +++++++++++++++++-------
>  1 file changed, 17 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
> index 85973ae728db..fb9d57967b2c 100644
> --- a/drivers/gpu/drm/bridge/tc358767.c
> +++ b/drivers/gpu/drm/bridge/tc358767.c
> @@ -1317,6 +1317,20 @@ static void tc_bridge_mode_set(struct drm_bridge *bridge,
>  	tc->mode = *mode;
>  }
>  
> +static struct edid *tc_get_edid(struct drm_bridge *bridge,
> +				struct drm_connector *connector)
> +{
> +	struct tc_data *tc = bridge_to_tc(bridge);
> +	struct edid *edid;
> +
> +	edid = drm_get_edid(connector, &tc->aux.ddc);
> +
> +	kfree(tc->edid);
> +	tc->edid = edid;

The caller (drm_bridge_connector_get_modes_edid()) calls kfree(edid), so
if you want to store it internally, you'll have to make a copy. Can you
skip internal storage altogether by freeing the memory in
tc_connector_get_modes() ?

> +
> +	return edid;
> +}
> +
>  static int tc_connector_get_modes(struct drm_connector *connector)
>  {
>  	struct tc_data *tc = connector_to_tc(connector);
> @@ -1336,12 +1350,7 @@ static int tc_connector_get_modes(struct drm_connector *connector)
>  			return count;
>  	}
>  
> -	edid = drm_get_edid(connector, &tc->aux.ddc);
> -
> -	kfree(tc->edid);
> -	tc->edid = edid;
> -	if (!edid)
> -		return 0;
> +	edid = tc_get_edid(&tc->bridge, connector);
>  
>  	drm_connector_update_edid_property(connector, edid);
>  	count = drm_add_edid_modes(connector, edid);
> @@ -1452,6 +1461,7 @@ static const struct drm_bridge_funcs tc_bridge_funcs = {
>  	.disable = tc_bridge_disable,
>  	.mode_fixup = tc_bridge_mode_fixup,
>  	.detect = tc_bridge_detect,
> +	.get_edid = tc_get_edid,
>  };
>  
>  static bool tc_readable_reg(struct device *dev, unsigned int reg)
> @@ -1685,7 +1695,7 @@ static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id)
>  		return ret;
>  
>  	tc->bridge.funcs = &tc_bridge_funcs;
> -	tc->bridge.ops = DRM_BRIDGE_OP_DETECT;
> +	tc->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID;
>  
>  	tc->bridge.of_node = dev->of_node;
>  	drm_bridge_add(&tc->bridge);
> -- 
> 2.25.1
>
diff mbox series

Patch

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index 85973ae728db..fb9d57967b2c 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -1317,6 +1317,20 @@  static void tc_bridge_mode_set(struct drm_bridge *bridge,
 	tc->mode = *mode;
 }
 
+static struct edid *tc_get_edid(struct drm_bridge *bridge,
+				struct drm_connector *connector)
+{
+	struct tc_data *tc = bridge_to_tc(bridge);
+	struct edid *edid;
+
+	edid = drm_get_edid(connector, &tc->aux.ddc);
+
+	kfree(tc->edid);
+	tc->edid = edid;
+
+	return edid;
+}
+
 static int tc_connector_get_modes(struct drm_connector *connector)
 {
 	struct tc_data *tc = connector_to_tc(connector);
@@ -1336,12 +1350,7 @@  static int tc_connector_get_modes(struct drm_connector *connector)
 			return count;
 	}
 
-	edid = drm_get_edid(connector, &tc->aux.ddc);
-
-	kfree(tc->edid);
-	tc->edid = edid;
-	if (!edid)
-		return 0;
+	edid = tc_get_edid(&tc->bridge, connector);
 
 	drm_connector_update_edid_property(connector, edid);
 	count = drm_add_edid_modes(connector, edid);
@@ -1452,6 +1461,7 @@  static const struct drm_bridge_funcs tc_bridge_funcs = {
 	.disable = tc_bridge_disable,
 	.mode_fixup = tc_bridge_mode_fixup,
 	.detect = tc_bridge_detect,
+	.get_edid = tc_get_edid,
 };
 
 static bool tc_readable_reg(struct device *dev, unsigned int reg)
@@ -1685,7 +1695,7 @@  static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id)
 		return ret;
 
 	tc->bridge.funcs = &tc_bridge_funcs;
-	tc->bridge.ops = DRM_BRIDGE_OP_DETECT;
+	tc->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID;
 
 	tc->bridge.of_node = dev->of_node;
 	drm_bridge_add(&tc->bridge);