linux-kernel - Re: [PATCH v3 2/2] drm/mediatek: set mt8173 dithering function

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Message-ID: <1469073492.11841.63.camel@mtksdaap41>
Date:	Thu, 21 Jul 2016 11:58:12 +0800
From:	CK Hu <ck.hu@...iatek.com>
To:	Bibby Hsieh <bibby.hsieh@...iatek.com>
CC:	David Airlie <airlied@...ux.ie>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	<dri-devel@...ts.freedesktop.org>,
	<linux-mediatek@...ts.infradead.org>,
	Yingjoe Chen <yingjoe.chen@...iatek.com>,
	Cawa Cheng <cawa.cheng@...iatek.com>,
	Daniel Kurtz <djkurtz@...omium.org>,
	"Philipp Zabel" <p.zabel@...gutronix.de>,
	YT Shen <yt.shen@...iatek.com>,
	"Thierry Reding" <thierry.reding@...il.com>,
	Mao Huang <littlecvr@...omium.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>,
	"Sascha Hauer" <kernel@...gutronix.de>
Subject: Re: [PATCH v3 2/2] drm/mediatek: set mt8173 dithering function

Hi, Bibby:

On Thu, 2016-07-21 at 11:21 +0800, Bibby Hsieh wrote:
> Hi, CK
> 
> I'm appreciate your comments.
> 
> 

[snip...]

> > >  
> > > @@ -469,7 +484,7 @@ void mtk_crtc_ddp_irq(struct drm_crtc *crtc, struct mtk_ddp_comp *ovl)
> > >  	if (state->pending_config) {
> > >  		mtk_ddp_comp_config(ovl, state->pending_width,
> > >  				    state->pending_height,
> > > -				    state->pending_vrefresh);
> > > +				    state->pending_vrefresh, 0);
> > 
> > Why set bpc as 0 here? Maybe you have a assumption that OVL don't care
> > the bpc parameter. If one day OVL care it and we do not review here, the
> > bugs happen.
> > 
> Pass 0 means don't care, I will modify mtk_od_config() and
> mtk_gamma_config() to filter this condition.

Using 0 as 'don't care' looks tricky. Please add comments to describe
this.

> > >  
> > >  		state->pending_config = false;
> > >  	}

Regards,
CK