Re: [PATCH v2] drm/client: Detect when ACPI lid is closed during initialization

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Tue, May 28, 2024 at 04:03:19PM -0500, Mario Limonciello wrote:
> If the lid on a laptop is closed when eDP connectors are populated
> then it remains enabled when the initial framebuffer configuration
> is built.
> 
> When creating the initial framebuffer configuration detect the ACPI
> lid status and if it's closed disable any eDP connectors.
> 
> Reported-by: Chris Bainbridge <chris.bainbridge@gmail.com>
> Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/3349
> Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
> ---
> Cc: hughsient@gmail.com
> v1->v2:
>  * Match LVDS as well
> ---
>  drivers/gpu/drm/drm_client_modeset.c | 30 ++++++++++++++++++++++++++++
>  1 file changed, 30 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_client_modeset.c b/drivers/gpu/drm/drm_client_modeset.c
> index 31af5cf37a09..0b0411086e76 100644
> --- a/drivers/gpu/drm/drm_client_modeset.c
> +++ b/drivers/gpu/drm/drm_client_modeset.c
> @@ -8,6 +8,7 @@
>   */
>  
>  #include "drm/drm_modeset_lock.h"
> +#include <acpi/button.h>
>  #include <linux/module.h>
>  #include <linux/mutex.h>
>  #include <linux/slab.h>
> @@ -257,6 +258,34 @@ static void drm_client_connectors_enabled(struct drm_connector **connectors,
>  		enabled[i] = drm_connector_enabled(connectors[i], false);
>  }
>  
> +static void drm_client_match_edp_lid(struct drm_device *dev,
> +				     struct drm_connector **connectors,
> +				     unsigned int connector_count,
> +				     bool *enabled)
> +{
> +	int i;
> +
> +	for (i = 0; i < connector_count; i++) {
> +		struct drm_connector *connector = connectors[i];
> +
> +		switch (connector->connector_type) {
> +		case DRM_MODE_CONNECTOR_LVDS:
> +		case DRM_MODE_CONNECTOR_eDP:
> +			if (!enabled[i])
> +				continue;
> +			break;
> +		default:
> +			continue;
> +		}
> +
> +		if (!acpi_lid_open()) {
> +			drm_dbg_kms(dev, "[CONNECTOR:%d:%s] lid is closed, disabling\n",
> +				    connector->base.id, connector->name);
> +			enabled[i] = false;
> +		}
> +	}
> +}

If you don't hook into some lid notify event how is one supposed to get
the display back to life after opening the lid?

> +
>  static bool drm_client_target_cloned(struct drm_device *dev,
>  				     struct drm_connector **connectors,
>  				     unsigned int connector_count,
> @@ -844,6 +873,7 @@ int drm_client_modeset_probe(struct drm_client_dev *client, unsigned int width,
>  		memset(crtcs, 0, connector_count * sizeof(*crtcs));
>  		memset(offsets, 0, connector_count * sizeof(*offsets));
>  
> +		drm_client_match_edp_lid(dev, connectors, connector_count, enabled);
>  		if (!drm_client_target_cloned(dev, connectors, connector_count, modes,
>  					      offsets, enabled, width, height) &&
>  		    !drm_client_target_preferred(dev, connectors, connector_count, modes,
> -- 
> 2.43.0

-- 
Ville Syrjälä
Intel