linux-kernel - Re: [PATCH] drm: imx: ipuv3-plane: fix HDMI cannot work for odd screen resolutions

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Message-ID: <01b335a8-0802-453b-a792-ceb5c54a41aa@nxp.com>
Date: Wed, 4 Sep 2024 13:40:10 +0800
From: Liu Ying <victor.liu@....com>
To: Paul Pu <hui.pu@...ealthcare.com>, p.zabel@...gutronix.de,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
 Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>,
 Pengutronix Kernel Team <kernel@...gutronix.de>,
 Fabio Estevam <festevam@...il.com>, Sasha Levin <sashal@...nel.org>,
 Lucas Stach <l.stach@...gutronix.de>
Cc: HuanWang@...ealthcare.com, taowang@...ealthcare.com,
 sebastian.reichel@...labora.com, ian.ray@...ealthcare.com,
 stable@...r.kernel.org, dri-devel@...ts.freedesktop.org,
 imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm: imx: ipuv3-plane: fix HDMI cannot work for odd
 screen resolutions

Hi Paul,

Thanks for your patch.

On 09/04/2024, Paul Pu wrote:
> This changes the judgement of if needing to round up the width or not,
> from using the `dp_flow` to the plane's type.
> 
> The `dp_flow` can be -22(-EINVAL) even the plane is a PRIMARY one.

s/even/even if/

> See `client_reg[]` in `ipu-common.c`.
> 
> [    0.605141] [drm:ipu_plane_init] channel 28, dp flow -22, possible_crtcs=0x0
> 
> Per the commit message in commit: 71f9fd5bcf09, using the plane type for

Commit 71f9fd5bcf09 is a commit that only exists in downstream kernel.

> judging if rounding up is needed is correct.
> 
> Fixes: 71f9fd5bcf09 ("drm/imx: ipuv3-plane: Fix overlay plane width")

Commit 4333472f8d7b is the one to fix in upstream kernel.

s/71f9fd5bcf09/4333472f8d7b/

> Cc: stable@...r.kernel.org

Better to mark the versions for backporting the fix.
Cc: stable@...r.kernel.org # 6.3+

> 

No blank line between tags.

> Signed-off-by: Paul Pu <hui.pu@...ealthcare.com>
> ---
>  drivers/gpu/drm/imx/ipuv3/ipuv3-plane.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Maybe, the patch subject can be something like:
drm/imx/ipuv3: ipuv3-plane: Round up plane width for IPUV3_CHANNEL_MEM_DC_SYNC

You may find example patch subject prefixes by looking at previous commits
which touch the same file, like
commit 71e3657cb126 ("drm/imx/ipuv3: ipuv3-plane: reuse local variable height
in atomic_update")

You may specify those fixed odd screen resolutions of your "HDMI" case in commit
message.

> 
> diff --git a/drivers/gpu/drm/imx/ipuv3/ipuv3-plane.c b/drivers/gpu/drm/imx/ipuv3/ipuv3-plane.c
> index 704c549750f9..cee83ac70ada 100644
> --- a/drivers/gpu/drm/imx/ipuv3/ipuv3-plane.c
> +++ b/drivers/gpu/drm/imx/ipuv3/ipuv3-plane.c
> @@ -614,7 +614,7 @@ static void ipu_plane_atomic_update(struct drm_plane *plane,
>  		break;
>  	}
>  
> -	if (ipu_plane->dp_flow == IPU_DP_FLOW_SYNC_BG)
> +	if (ipu_plane->base.type == DRM_PLANE_TYPE_PRIMARY)

plane->type is more readable. 

>  		width = ipu_src_rect_width(new_state);
>  	else
>  		width = drm_rect_width(&new_state->src) >> 16;
> 
> base-commit: 431c1646e1f86b949fa3685efc50b660a364c2b6

-- 
Regards,
Liu Ying