linux-kernel - Re: [PATCH 1/3] drm/vc4: Match drm_dev_enter and exit calls in vc4_hvs_lut

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Message-ID: <09072cb7-bedc-4957-9b1e-cb8623c5297c@samsung.com>
Date: Wed, 9 Oct 2024 08:20:33 +0200
From: Marek Szyprowski <m.szyprowski@...sung.com>
To: Dave Stevenson <dave.stevenson@...pberrypi.com>, Maxime Ripard
	<mripard@...nel.org>, Raspberry Pi Kernel Maintenance
	<kernel-list@...pberrypi.com>, Maarten Lankhorst
	<maarten.lankhorst@...ux.intel.com>, Thomas Zimmermann
	<tzimmermann@...e.de>, David Airlie <airlied@...il.com>, Simona Vetter
	<simona@...ll.ch>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] drm/vc4: Match drm_dev_enter and exit calls in
 vc4_hvs_lut_load

On 08.10.2024 18:44, Dave Stevenson wrote:
> Commit 52efe364d196 ("drm/vc4: hvs: Don't write gamma luts on 2711")
> added a return path to vc4_hvs_lut_load that had called
> drm_dev_enter, but not drm_dev_exit.
>
> Ensure we call drm_dev_exit.
>
> Fixes: 52efe364d196 ("drm/vc4: hvs: Don't write gamma luts on 2711")
> Reported-by: Marek Szyprowski <m.szyprowski@...sung.com>
> Closes: https://lore.kernel.org/dri-devel/37051126-3921-4afe-a936-5f828bff5752@samsung.com/
> Signed-off-by: Dave Stevenson <dave.stevenson@...pberrypi.com>
Tested-by: Marek Szyprowski <m.szyprowski@...sung.com>
> ---
>   drivers/gpu/drm/vc4/vc4_hvs.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_hvs.c b/drivers/gpu/drm/vc4/vc4_hvs.c
> index 2a366a607fcc..546ee11016b2 100644
> --- a/drivers/gpu/drm/vc4/vc4_hvs.c
> +++ b/drivers/gpu/drm/vc4/vc4_hvs.c
> @@ -225,7 +225,7 @@ static void vc4_hvs_lut_load(struct vc4_hvs *hvs,
>   		return;
>   
>   	if (hvs->vc4->gen == VC4_GEN_4)
> -		return;
> +		goto exit;
>   
>   	/* The LUT memory is laid out with each HVS channel in order,
>   	 * each of which takes 256 writes for R, 256 for G, then 256
> @@ -242,6 +242,7 @@ static void vc4_hvs_lut_load(struct vc4_hvs *hvs,
>   	for (i = 0; i < crtc->gamma_size; i++)
>   		HVS_WRITE(SCALER_GAMDATA, vc4_crtc->lut_b[i]);
>   
> +exit:
>   	drm_dev_exit(idx);
>   }
>   
>
Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland