Re: [PATCH v8 7/8] drm/i915/opregion: convert intel_opregion_get_edid() to struct drm_edid

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

On Thu, Jan 19, 2023 at 06:19:00PM +0200, Jani Nikula wrote:
> Simplify validation and use by converting to drm_edid.
> 
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Signed-off-by: Jani Nikula <jani.nikula@intel.com>

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

> ---
>  drivers/gpu/drm/i915/display/intel_dp.c       | 10 ++-----
>  drivers/gpu/drm/i915/display/intel_opregion.c | 29 +++++++------------
>  drivers/gpu/drm/i915/display/intel_opregion.h |  4 +--
>  3 files changed, 15 insertions(+), 28 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> index 4cc7c04b9bda..a44eefb97e8d 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -5296,18 +5296,12 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
>  	mutex_lock(&dev_priv->drm.mode_config.mutex);
>  	drm_edid = drm_edid_read_ddc(connector, &intel_dp->aux.ddc);
>  	if (!drm_edid) {
> -		const struct edid *edid;
> -
>  		/* Fallback to EDID from ACPI OpRegion, if any */
> -		/* FIXME: Make intel_opregion_get_edid() return drm_edid */
> -		edid = intel_opregion_get_edid(intel_connector);
> -		if (edid) {
> -			drm_edid = drm_edid_alloc(edid, (edid->extensions + 1) * EDID_LENGTH);
> +		drm_edid = intel_opregion_get_edid(intel_connector);
> +		if (drm_edid)
>  			drm_dbg_kms(&dev_priv->drm,
>  				    "[CONNECTOR:%d:%s] Using OpRegion EDID\n",
>  				    connector->base.id, connector->name);
> -			kfree(edid);
> -		}
>  	}
>  	if (drm_edid) {
>  		if (drm_edid_connector_update(connector, drm_edid) ||
> diff --git a/drivers/gpu/drm/i915/display/intel_opregion.c b/drivers/gpu/drm/i915/display/intel_opregion.c
> index e0184745632c..b8dce0576512 100644
> --- a/drivers/gpu/drm/i915/display/intel_opregion.c
> +++ b/drivers/gpu/drm/i915/display/intel_opregion.c
> @@ -1101,41 +1101,34 @@ intel_opregion_get_panel_type(struct drm_i915_private *dev_priv)
>   * The EDID in the OpRegion, or NULL if there is none or it's invalid.
>   *
>   */
> -struct edid *intel_opregion_get_edid(struct intel_connector *intel_connector)
> +const struct drm_edid *intel_opregion_get_edid(struct intel_connector *intel_connector)
>  {
>  	struct drm_connector *connector = &intel_connector->base;
>  	struct drm_i915_private *i915 = to_i915(connector->dev);
>  	struct intel_opregion *opregion = &i915->display.opregion;
> -	const void *in_edid;
> -	const struct edid *edid;
> -	struct edid *new_edid;
> +	const struct drm_edid *drm_edid;
> +	const void *edid;
>  	int len;
>  
>  	if (!opregion->asle_ext)
>  		return NULL;
>  
> -	in_edid = opregion->asle_ext->bddc;
> +	edid = opregion->asle_ext->bddc;
>  
>  	/* Validity corresponds to number of 128-byte blocks */
>  	len = (opregion->asle_ext->phed & ASLE_PHED_EDID_VALID_MASK) * 128;
> -	if (!len || !memchr_inv(in_edid, 0, len))
> +	if (!len || !memchr_inv(edid, 0, len))
>  		return NULL;
>  
> -	edid = in_edid;
> +	drm_edid = drm_edid_alloc(edid, len);
>  
> -	if (len < EDID_LENGTH * (1 + edid->extensions)) {
> -		drm_dbg_kms(&i915->drm, "Invalid EDID in ACPI OpRegion (Mailbox #5): too short\n");
> -		return NULL;
> -	}
> -	new_edid = drm_edid_duplicate(edid);
> -	if (!new_edid)
> -		return NULL;
> -	if (!drm_edid_is_valid(new_edid)) {
> -		kfree(new_edid);
> +	if (!drm_edid_valid(drm_edid)) {
>  		drm_dbg_kms(&i915->drm, "Invalid EDID in ACPI OpRegion (Mailbox #5)\n");
> -		return NULL;
> +		drm_edid_free(drm_edid);
> +		drm_edid = NULL;
>  	}
> -	return new_edid;
> +
> +	return drm_edid;
>  }
>  
>  bool intel_opregion_headless_sku(struct drm_i915_private *i915)
> diff --git a/drivers/gpu/drm/i915/display/intel_opregion.h b/drivers/gpu/drm/i915/display/intel_opregion.h
> index 2f261f985400..d02e6696a050 100644
> --- a/drivers/gpu/drm/i915/display/intel_opregion.h
> +++ b/drivers/gpu/drm/i915/display/intel_opregion.h
> @@ -74,7 +74,7 @@ int intel_opregion_notify_encoder(struct intel_encoder *intel_encoder,
>  int intel_opregion_notify_adapter(struct drm_i915_private *dev_priv,
>  				  pci_power_t state);
>  int intel_opregion_get_panel_type(struct drm_i915_private *dev_priv);
> -struct edid *intel_opregion_get_edid(struct intel_connector *connector);
> +const struct drm_edid *intel_opregion_get_edid(struct intel_connector *connector);
>  
>  bool intel_opregion_headless_sku(struct drm_i915_private *i915);
>  
> @@ -123,7 +123,7 @@ static inline int intel_opregion_get_panel_type(struct drm_i915_private *dev)
>  	return -ENODEV;
>  }
>  
> -static inline struct edid *
> +static inline const struct drm_edid *
>  intel_opregion_get_edid(struct intel_connector *connector)
>  {
>  	return NULL;
> -- 
> 2.34.1

-- 
Ville Syrjälä
Intel