linux-kernel - Re: [PATCH v2 1/5] drm/rockchip: vop: optimize virtual stride calculate

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Date:	Thu, 2 Jul 2015 13:59:04 +0900
From:	Tomasz Figa <tfiga@...omium.org>
To:	Mark Yao <mark.yao@...k-chips.com>
Cc:	dri-devel <dri-devel@...ts.freedesktop.org>,
	David Airlie <airlied@...ux.ie>,
	Heiko Stuebner <heiko@...ech.de>,
	Daniel Kurtz <djkurtz@...omium.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Daniel Vetter <daniel@...ll.ch>,
	Rob Clark <robdclark@...il.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	sandy.huang@...k-chips.com, dkm@...k-chips.com, zwl@...k-chips.com,
	xw@...k-chips.com
Subject: Re: [PATCH v2 1/5] drm/rockchip: vop: optimize virtual stride calculate

On Fri, Jun 26, 2015 at 7:07 PM, Mark Yao <mark.yao@...k-chips.com> wrote:
> vir_stride need number words of the virtual width, and fb->pitches
> save bytes_per_pixel, so just div 4 switch to stride.
>
> Signed-off-by: Mark Yao <mark.yao@...k-chips.com>
> ---
> Changes in v2: None
>
>  drivers/gpu/drm/rockchip/rockchip_drm_vop.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> index 6188221..3c9f4f3 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> @@ -644,7 +644,7 @@ static int vop_update_plane_event(struct drm_plane *plane,
>         offset += (src.y1 >> 16) * fb->pitches[0];
>         yrgb_mst = rk_obj->dma_addr + offset;
>
> -       y_vir_stride = fb->pitches[0] / (fb->bits_per_pixel >> 3);
> +       y_vir_stride = fb->pitches[0] >> 2;

If the unit of y_vir_stride is words then doesn't it mean that the
calculation before this patch was just invalid? If yes, shouldn't the
subject actually say "Fix virtual stride calculation"?

Best regards,
Tomasz
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