linux-kernel - Re: [PATCH] drm/rockchip: vop: fix window origin calculation

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Date:	Tue, 10 Nov 2015 18:07:16 +0800
From:	Yakir Yang <ykk@...k-chips.com>
To:	Mark Yao <mark.yao@...k-chips.com>,
	David Airlie <airlied@...ux.ie>,
	Heiko Stuebner <heiko@...ech.de>,
	Russell King <linux@....linux.org.uk>,
	dri-devel@...ts.freedesktop.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/rockchip: vop: fix window origin calculation

Hi Mark,

On 11/10/2015 05:59 PM, Mark Yao wrote:
> From: Dominik Behr <dbehr@...omium.org>
>
> VOP_WINx_DSP_ST does not require subtracting 1 from the values written to
> it. It actually causes the screen to be shifted by one pixel.
>
> Signed-off-by: Mark Yao <mark.yao@...k-chips.com>

I have meet the screen shift problem on RK3036 SDK board, and this
could fix my problem, so

Tested-by: Yakir Yang <ykk@...k-chips.com>

- Yakir

> ---
>   drivers/gpu/drm/rockchip/rockchip_drm_vop.c |    4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> index 48719df..4730ae4 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> @@ -959,8 +959,8 @@ static int vop_update_plane_event(struct drm_plane *plane,
>   	val = (dest.y2 - dest.y1 - 1) << 16;
>   	val |= (dest.x2 - dest.x1 - 1) & 0xffff;
>   	VOP_WIN_SET(vop, win, dsp_info, val);
> -	val = (dsp_sty - 1) << 16;
> -	val |= (dsp_stx - 1) & 0xffff;
> +	val = dsp_sty << 16;
> +	val |= dsp_stx & 0xffff;
>   	VOP_WIN_SET(vop, win, dsp_st, val);
>   	VOP_WIN_SET(vop, win, rb_swap, rb_swap);
>   


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