On Wed, 26 Nov 2025, Yaroslav Bolyukin <iam@lach.pw> wrote:
Commit message goes here.
> Signed-off-by: Yaroslav Bolyukin <iam@lach.pw>
> ---
> drivers/gpu/drm/drm_displayid_internal.h | 1 +
> drivers/gpu/drm/drm_edid.c | 3 ++-
> 2 files changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/drm_displayid_internal.h b/drivers/gpu/drm/drm_displayid_internal.h
> index 724174b429f2..55f972d32847 100644
> --- a/drivers/gpu/drm/drm_displayid_internal.h
> +++ b/drivers/gpu/drm/drm_displayid_internal.h
> @@ -139,6 +139,7 @@ struct displayid_formula_timings_9 {
> u8 vrefresh;
> } __packed;
>
> +#define DISPLAYID_BLOCK_DESCRIPTOR_PAYLOAD_BYTES GENMASK(6, 4)
> struct displayid_formula_timing_block {
> struct displayid_block base;
> struct displayid_formula_timings_9 timings[];
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index 72a94b1713e2..7bdc99d5084a 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -6906,7 +6906,8 @@ static int add_displayid_formula_modes(struct drm_connector *connector,
> struct drm_display_mode *newmode;
> int num_modes = 0;
> bool type_10 = block->tag == DATA_BLOCK_2_TYPE_10_FORMULA_TIMING;
> - int timing_size = 6 + ((formula_block->base.rev & 0x70) >> 4);
> + int timing_size = 6 +
> + FIELD_GET(DISPLAYID_BLOCK_DESCRIPTOR_PAYLOAD_BYTES, formula_block->base.rev);
>
> /* extended blocks are not supported yet */
> if (timing_size != 6)
--
Jani Nikula, Intel