On Tue, Oct 11, 2022 at 04:49:41PM +0300, Jani Nikula wrote:
> Split the drm_edid block count helper to a base version that reports the
> block count indicated by EDID contents, and another on top that limits
> the block count based on size allocated for the EDID.
>
> Signed-off-by: Jani Nikula <jani.nik...@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
> ---
> drivers/gpu/drm/drm_edid.c | 15 +++++++++++----
> 1 file changed, 11 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index 8baa46dc2537..616c1cdc7507 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -1613,7 +1613,8 @@ static const void *edid_extension_block_data(const
> struct edid *edid, int index)
> return edid_block_data(edid, index + 1);
> }
>
> -static int drm_edid_block_count(const struct drm_edid *drm_edid)
> +/* EDID block count indicated in EDID, may exceed allocated size */
> +static int __drm_edid_block_count(const struct drm_edid *drm_edid)
> {
> int num_blocks;
>
> @@ -1633,12 +1634,18 @@ static int drm_edid_block_count(const struct drm_edid
> *drm_edid)
> num_blocks = eeodb;
> }
>
> - /* Limit by allocated size */
> - num_blocks = min(num_blocks, (int)drm_edid->size / EDID_LENGTH);
> -
> return num_blocks;
> }
>
> +/* EDID block count, limited by allocated size */
> +static int drm_edid_block_count(const struct drm_edid *drm_edid)
> +{
> + /* Limit by allocated size */
> + return min(__drm_edid_block_count(drm_edid),
> + (int)drm_edid->size / EDID_LENGTH);
> +}
> +
> +/* EDID extension block count, limited by allocated size */
> static int drm_edid_extension_block_count(const struct drm_edid *drm_edid)
> {
> return drm_edid_block_count(drm_edid) - 1;
> --
> 2.34.1
--
Ville Syrjälä
Intel
