Re: [PATCH v4 12/15] drm/bridge: megachips: add get_edid bridge operation

From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Sam Ravnborg <sam@ravnborg.org>
Cc: Jernej Skrabec <jernej.skrabec@siol.net>,
	Peter Senna Tschudin <peter.senna@gmail.com>,
	kbuild test robot <lkp@intel.com>,
	Jonas Karlman <jonas@kwiboo.se>,
	Neil Armstrong <narmstrong@baylibre.com>,
	dri-devel@lists.freedesktop.org,
	Martyn Welch <martyn.welch@collabora.co.uk>,
	Andrzej Hajda <a.hajda@samsung.com>,
	Thierry Reding <thierry.reding@gmail.com>,
	Martin Donnelly <martin.donnelly@ge.com>
Subject: Re: [PATCH v4 12/15] drm/bridge: megachips: add get_edid bridge operation
Date: Mon, 27 Jul 2020 00:57:05 +0300	[thread overview]
Message-ID: <20200726215705.GE28704@pendragon.ideasonboard.com> (raw)
In-Reply-To: <20200726203324.3722593-13-sam@ravnborg.org>

Hi Sam,

Thank you for the patch.

On Sun, Jul 26, 2020 at 10:33:21PM +0200, Sam Ravnborg wrote:
> To prepare for a chained bridge setup add support for the
> get_edid bridge operation.
> There is no need for a copy of the edid - so drop
> the pointer to the copy.
> 
> v2:
>   - Fix so we do not leak memory (Laurent)
> 
> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
> Cc: Peter Senna Tschudin <peter.senna@gmail.com>
> Cc: Martin Donnelly <martin.donnelly@ge.com>
> Cc: Martyn Welch <martyn.welch@collabora.co.uk>
> 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>

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

> ---
>  .../bridge/megachips-stdpxxxx-ge-b850v3-fw.c  | 31 ++++++++++---------
>  1 file changed, 17 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c b/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c
> index 450dca33ea48..f7b55dc374ac 100644
> --- a/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c
> +++ b/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c
> @@ -61,7 +61,6 @@ struct ge_b850v3_lvds {
>  	struct drm_bridge bridge;
>  	struct i2c_client *stdp4028_i2c;
>  	struct i2c_client *stdp2690_i2c;
> -	struct edid *edid;
>  };
>  
>  static struct ge_b850v3_lvds *ge_b850v3_lvds_ptr;
> @@ -131,22 +130,26 @@ static u8 *stdp2690_get_edid(struct i2c_client *client)
>  	return NULL;
>  }
>  
> -static int ge_b850v3_lvds_get_modes(struct drm_connector *connector)
> +static struct edid *ge_b850v3_lvds_get_edid(struct drm_bridge *bridge,
> +					    struct drm_connector *connector)
>  {
>  	struct i2c_client *client;
> -	int num_modes = 0;
>  
>  	client = ge_b850v3_lvds_ptr->stdp2690_i2c;
>  
> -	kfree(ge_b850v3_lvds_ptr->edid);
> -	ge_b850v3_lvds_ptr->edid = (struct edid *)stdp2690_get_edid(client);
> +	return (struct edid *)stdp2690_get_edid(client);
> +}
>  
> -	if (ge_b850v3_lvds_ptr->edid) {
> -		drm_connector_update_edid_property(connector,
> -						      ge_b850v3_lvds_ptr->edid);
> -		num_modes = drm_add_edid_modes(connector,
> -					       ge_b850v3_lvds_ptr->edid);
> -	}
> +static int ge_b850v3_lvds_get_modes(struct drm_connector *connector)
> +{
> +	struct edid *edid;
> +	int num_modes;
> +
> +	edid = ge_b850v3_lvds_get_edid(&ge_b850v3_lvds_ptr->bridge, connector);
> +
> +	drm_connector_update_edid_property(connector, edid);
> +	num_modes = drm_add_edid_modes(connector, edid);
> +	kfree(edid);
>  
>  	return num_modes;
>  }
> @@ -269,6 +272,7 @@ static int ge_b850v3_lvds_attach(struct drm_bridge *bridge,
>  static const struct drm_bridge_funcs ge_b850v3_lvds_funcs = {
>  	.attach = ge_b850v3_lvds_attach,
>  	.detect = ge_b850v3_lvds_bridge_detect,
> +	.get_edid = ge_b850v3_lvds_get_edid,
>  };
>  
>  static int ge_b850v3_lvds_init(struct device *dev)
> @@ -304,8 +308,6 @@ static void ge_b850v3_lvds_remove(void)
>  
>  	drm_bridge_remove(&ge_b850v3_lvds_ptr->bridge);
>  
> -	kfree(ge_b850v3_lvds_ptr->edid);
> -
>  	ge_b850v3_lvds_ptr = NULL;
>  out:
>  	mutex_unlock(&ge_b850v3_lvds_dev_mutex);
> @@ -323,7 +325,8 @@ static int stdp4028_ge_b850v3_fw_probe(struct i2c_client *stdp4028_i2c,
>  
>  	/* drm bridge initialization */
>  	ge_b850v3_lvds_ptr->bridge.funcs = &ge_b850v3_lvds_funcs;
> -	ge_b850v3_lvds_ptr->bridge.ops = DRM_BRIDGE_OP_DETECT;
> +	ge_b850v3_lvds_ptr->bridge.ops = DRM_BRIDGE_OP_DETECT |
> +					 DRM_BRIDGE_OP_EDID;
>  	ge_b850v3_lvds_ptr->bridge.of_node = dev->of_node;
>  	drm_bridge_add(&ge_b850v3_lvds_ptr->bridge);
>  

-- 
Regards,

Laurent Pinchart
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