linux-kernel - Re: [PATCH v6 5/7] drm/edid: for consistency, use mask everywhere for block rev parsing

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Message-ID: <0c963fb035a157c4094ba7410d4787697cd95699@intel.com>
Date: Wed, 26 Nov 2025 16:20:14 +0200
From: Jani Nikula <jani.nikula@...ux.intel.com>
To: Yaroslav Bolyukin <iam@...h.pw>, Ville Syrjälä
 <ville.syrjala@...ux.intel.com>, Maarten Lankhorst
 <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>,
 Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>,
 Simona Vetter <simona@...ll.ch>
Cc: Harry Wentland <harry.wentland@....com>, Leo Li <sunpeng.li@....com>,
 Rodrigo Siqueira <siqueira@...lia.com>, Alex Deucher
 <alexander.deucher@....com>, Christian König
 <christian.koenig@....com>,
 Wayne Lin <Wayne.Lin@....com>, amd-gfx@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org, Yaroslav
 Bolyukin <iam@...h.pw>
Subject: Re: [PATCH v6 5/7] drm/edid: for consistency, use mask everywhere
 for block rev parsing

On Wed, 26 Nov 2025, Yaroslav Bolyukin <iam@...h.pw> wrote:

Commit message goes here.

> Signed-off-by: Yaroslav Bolyukin <iam@...h.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