linux-kernel - Re: [PATCH 04/14] drm/imx: dc-fu: Fix dimensions

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Message-ID: <aM1up3DXHi+V1KYj@lizhi-Precision-Tower-5810>
Date: Fri, 19 Sep 2025 10:54:31 -0400
From: Frank Li <Frank.li@....com>
To: Liu Ying <victor.liu@....com>
Cc: Philipp Zabel <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>, Simona Vetter <simona@...ll.ch>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	Dmitry Baryshkov <lumag@...nel.org>,
	dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/14] drm/imx: dc-fu: Fix dimensions

On Fri, Jul 04, 2025 at 05:03:51PM +0800, Liu Ying wrote:
> Fix off-by-one issue in LINEWIDTH, LINECOUNT, FRAMEWIDTH and FRAMEHEIGHT
> macro definitions.  The first two macros are used to set a fetchunit's
> source buffer dimension and the other two are used to set a fetchunit's
> frame dimension.  It appears that display controller itself works ok
> without this fix, however, it enters panic mode when prefetch engine(DPRC
> and PRGs) attaches to it without this fix.
>
> Fixes: 0e177d5ce01c ("drm/imx: Add i.MX8qxp Display Controller pixel engine")
> Signed-off-by: Liu Ying <victor.liu@....com>

Reviewed-by: Frank Li <Frank.Li@....com>

> ---
>  drivers/gpu/drm/imx/dc/dc-fu.c | 4 ++--
>  drivers/gpu/drm/imx/dc/dc-fu.h | 4 ++--
>  2 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/imx/dc/dc-fu.c b/drivers/gpu/drm/imx/dc/dc-fu.c
> index f94c591c815891468a5c2a940076963eeaa4d51c..b36d3034b8d5962eaab212b6b65ebbb5c29f978c 100644
> --- a/drivers/gpu/drm/imx/dc/dc-fu.c
> +++ b/drivers/gpu/drm/imx/dc/dc-fu.c
> @@ -31,8 +31,8 @@
>  #define STRIDE(x)			FIELD_PREP(STRIDE_MASK, (x) - 1)
>
>  /* SOURCEBUFFERDIMENSION */
> -#define LINEWIDTH(x)			FIELD_PREP(GENMASK(13, 0), (x))
> -#define LINECOUNT(x)			FIELD_PREP(GENMASK(29, 16), (x))
> +#define LINEWIDTH(x)			FIELD_PREP(GENMASK(13, 0), (x) - 1)
> +#define LINECOUNT(x)			FIELD_PREP(GENMASK(29, 16), (x) - 1)
>
>  /* LAYEROFFSET */
>  #define LAYERXOFFSET(x)			FIELD_PREP(GENMASK(14, 0), (x))
> diff --git a/drivers/gpu/drm/imx/dc/dc-fu.h b/drivers/gpu/drm/imx/dc/dc-fu.h
> index e016e1ea5b4e0471cf6627782603e72d0475c4e8..518d1af49f5ae9d4f67da5e6c2e80abd7e962120 100644
> --- a/drivers/gpu/drm/imx/dc/dc-fu.h
> +++ b/drivers/gpu/drm/imx/dc/dc-fu.h
> @@ -38,8 +38,8 @@
>  #define SOURCEBUFFERENABLE		BIT(31)
>
>  /* FRAMEDIMENSIONS */
> -#define FRAMEWIDTH(x)			FIELD_PREP(GENMASK(13, 0), (x))
> -#define FRAMEHEIGHT(x)			FIELD_PREP(GENMASK(29, 16), (x))
> +#define FRAMEWIDTH(x)			FIELD_PREP(GENMASK(13, 0), (x) - 1)
> +#define FRAMEHEIGHT(x)			FIELD_PREP(GENMASK(29, 16), (x) - 1)
>
>  /* CONTROL */
>  #define INPUTSELECT_MASK		GENMASK(4, 3)
>
> --
> 2.34.1
>