linux-kernel - Re: [PATCH v2 22/26] drm/rockchip: vop: test for P{H,V}SYNC

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Message-ID: <5885ACC5.5090108@rock-chips.com>
Date:   Mon, 23 Jan 2017 15:12:05 +0800
From:   Mark yao <mark.yao@...k-chips.com>
To:     John Keeping <john@...anate.com>
Cc:     Chris Zhong <zyw@...k-chips.com>, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 22/26] drm/rockchip: vop: test for P{H,V}SYNC

On 2017年01月22日 00:31, John Keeping wrote:
> When connected to the MIPI DSI output, we need to use N{H,V}SYNC for the
> internal connection but these flags are meaningless for DSI panels.
> Switch the test so that we do not set the P{H,V}SYNC bits unless the
> mode requires it.
>
> Signed-off-by: John Keeping <john@...anate.com>
> ---
> Unchanged in v2
> ---
>   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 c7eba305c488..67aefc6d4e9a 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> @@ -933,8 +933,8 @@ static void vop_crtc_enable(struct drm_crtc *crtc)
>   	}
>   
>   	pin_pol = 0x8;
> -	pin_pol |= (adjusted_mode->flags & DRM_MODE_FLAG_NHSYNC) ? 0 : 1;
> -	pin_pol |= (adjusted_mode->flags & DRM_MODE_FLAG_NVSYNC) ? 0 : (1 << 1);
> +	pin_pol |= (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC) ? 1 : 0;
> +	pin_pol |= (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC) ? (1 << 1) : 0;

I'm confuse that why SYNC flags have N and P on drm, they are same meaning.

If no one configure display mode's flags, I don't know which one is 
correct, N or P? it's a problem.
Does anyone can answer it?

For this patch, it may effect non-sync flags mode on other connector's 
behavior,
but seems mostly display mode has sync flags except mipi dsi connector, 
I think feed mipi's requirement would be better.

So it's no problem  on my side.

Reviewed-by: Mark Yao <mark.yao@...k-chips.com>

>   	VOP_CTRL_SET(vop, pin_pol, pin_pol);
>   
>   	switch (s->output_type) {


-- 
Ｍark Yao