[PATCH] drm/sysfs: Send out uevent when connector->force changes

[Chris Wilson]

On Thu, Nov 19, 2015 at 05:46:50PM +0100, Daniel Vetter wrote:
> To avoid even more code duplication punt this all to the probe worker,
> which needs some slight adjustment to also generate a uevent when the
> status has changed to due connector->force.
> 
> v2: Instead of running the output_poll_work (which is kinda the wrong
> thing and a layering violation since it's an internal of the probe
> helpers), or calling ->detect (which is again a layering violation
> since it's used only by probe helpers) just call the official
> ->fill_modes function, like a GET_CONNECTOR ioctl call.
> 
> v3: Restore the accidentally removed forced-probe for echo "detect" >
> force.
> 

> diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c
> index 9ac4ffa6cce3..df66d9447cb0 100644
> --- a/drivers/gpu/drm/drm_sysfs.c
> +++ b/drivers/gpu/drm/drm_sysfs.c
> @@ -167,47 +167,35 @@ static ssize_t status_store(struct device *device,
>  {
>  	struct drm_connector *connector = to_drm_connector(device);
>  	struct drm_device *dev = connector->dev;
> -	enum drm_connector_status old_status;
> +	enum drm_connector_force old_force;
>  	int ret;
>  
>  	ret = mutex_lock_interruptible(&dev->mode_config.mutex);
>  	if (ret)
>  		return ret;
>  
> -	old_status = connector->status;
> +	old_force = connector->force;
>  
> -	if (sysfs_streq(buf, "detect")) {
> +	if (sysfs_streq(buf, "detect"))
>  		connector->force = 0;
> -		connector->status = connector->funcs->detect(connector, true);
> -	} else if (sysfs_streq(buf, "on")) {
> +	else if (sysfs_streq(buf, "on"))
>  		connector->force = DRM_FORCE_ON;
> -	} else if (sysfs_streq(buf, "on-digital")) {
> +	else if (sysfs_streq(buf, "on-digital"))
>  		connector->force = DRM_FORCE_ON_DIGITAL;
> -	} else if (sysfs_streq(buf, "off")) {
> +	else if (sysfs_streq(buf, "off"))
>  		connector->force = DRM_FORCE_OFF;
> -	} else
> +	else
>  		ret = -EINVAL;
>  
> -	if (ret == 0 && connector->force) {
> -		if (connector->force == DRM_FORCE_ON ||
> -		    connector->force == DRM_FORCE_ON_DIGITAL)
> -			connector->status = connector_status_connected;
> -		else
> -			connector->status = connector_status_disconnected;
> -		if (connector->funcs->force)
> -			connector->funcs->force(connector);
> -	}
> -
> -	if (old_status != connector->status) {
> -		DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n",
> +	if (old_force != connector->force || !connector->force) {
> +		DRM_DEBUG_KMS("[CONNECTOR:%d:%s] force updated from %d to %d or reprobing\n",
>  			      connector->base.id,
>  			      connector->name,
> -			      old_status, connector->status);
> +			      old_force, connector->force);
>  
> -		dev->mode_config.delayed_event = true;
> -		if (dev->mode_config.poll_enabled)
> -			schedule_delayed_work(&dev->mode_config.output_poll_work,
> -					      0);
> +		connector->funcs->fill_modes(connector,
> +					     dev->mode_config.max_width,
> +					     dev->mode_config.max_height);

This now does fill_modes() before we call detect(). We rely on the
ordering of detect() before doing fill_modes() as in many cases we use
the EDID gathered in detect() to generate the modes (if I am not
mistaken, I think we merged those patches to cache the EDID for a
detection cycle).
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre