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 <[email protected]>
Reviewed-by: Frank Li <[email protected]>
> ---
> 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
>
