[PATCH] drm/exynos: mixer: avoid Oops in vp_video_buffer()

[Tobias Jakobi]

Please disregard this one, need to rebase. v2 in a minute...

- Tobias


Tobias Jakobi wrote:
> If an interlaced video mode is selected, a IOMMU pagefault is
> triggered by vp_video_buffer().
> 
> Fix the most apparent bugs:
> - pitch value for chroma plane
> - divide by two of height and vpos
> 
> This is more like a band-aid at this point. The VP plane is
> still corrupted, but at least there are no more pagefaults.
> 
> Signed-off-by: Tobias Jakobi <tjakobi at math.uni-bielefeld.de>
> ---
>  drivers/gpu/drm/exynos/exynos_mixer.c | 21 +++++++++++----------
>  1 file changed, 11 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c
> index dc5d79465f9b..c382f99e0f5b 100644
> --- a/drivers/gpu/drm/exynos/exynos_mixer.c
> +++ b/drivers/gpu/drm/exynos/exynos_mixer.c
> @@ -485,7 +485,7 @@ static void vp_video_buffer(struct mixer_context *ctx,
>  			chroma_addr[1] = chroma_addr[0] + 0x40;
>  		} else {
>  			luma_addr[1] = luma_addr[0] + fb->pitches[0];
> -			chroma_addr[1] = chroma_addr[0] + fb->pitches[0];
> +			chroma_addr[1] = chroma_addr[0] + fb->pitches[1];
>  		}
>  	} else {
>  		luma_addr[1] = 0;
> @@ -507,25 +507,26 @@ static void vp_video_buffer(struct mixer_context *ctx,
>  	vp_reg_write(ctx, VP_IMG_SIZE_Y, VP_IMG_HSIZE(fb->pitches[0]) |
>  		VP_IMG_VSIZE(fb->height));
>  	/* chroma plane for NV12/NV21 is half the height of the luma plane */
> -	vp_reg_write(ctx, VP_IMG_SIZE_C, VP_IMG_HSIZE(fb->pitches[0]) |
> +	vp_reg_write(ctx, VP_IMG_SIZE_C, VP_IMG_HSIZE(fb->pitches[1]) |
>  		VP_IMG_VSIZE(fb->height / 2));
>  
>  	vp_reg_write(ctx, VP_SRC_WIDTH, state->src.w);
> -	vp_reg_write(ctx, VP_SRC_HEIGHT, state->src.h);
>  	vp_reg_write(ctx, VP_SRC_H_POSITION,
>  			VP_SRC_H_POSITION_VAL(state->src.x));
> -	vp_reg_write(ctx, VP_SRC_V_POSITION, state->src.y);
>  
> -	vp_reg_write(ctx, VP_DST_WIDTH, state->crtc.w);
> -	vp_reg_write(ctx, VP_DST_H_POSITION, state->crtc.x);
>  	if (test_bit(MXR_BIT_INTERLACE, &ctx->flags)) {
> -		vp_reg_write(ctx, VP_DST_HEIGHT, state->crtc.h / 2);
> -		vp_reg_write(ctx, VP_DST_V_POSITION, state->crtc.y / 2);
> +		vp_reg_write(res, VP_SRC_HEIGHT, state->src.h / 2);
> +		vp_reg_write(res, VP_SRC_V_POSITION, state->src.y / 2);
>  	} else {
> -		vp_reg_write(ctx, VP_DST_HEIGHT, state->crtc.h);
> -		vp_reg_write(ctx, VP_DST_V_POSITION, state->crtc.y);
> +		vp_reg_write(res, VP_SRC_HEIGHT, state->src.h);
> +		vp_reg_write(res, VP_SRC_V_POSITION, state->src.y);
>  	}
>  
> +	vp_reg_write(res, VP_DST_WIDTH, state->crtc.w);
> +	vp_reg_write(res, VP_DST_H_POSITION, state->crtc.x);
> +	vp_reg_write(res, VP_DST_HEIGHT, state->crtc.h);
> +	vp_reg_write(res, VP_DST_V_POSITION, state->crtc.y);
> +
>  	vp_reg_write(ctx, VP_H_RATIO, state->h_ratio);
>  	vp_reg_write(ctx, VP_V_RATIO, state->v_ratio);
>  
>