linux-kernel - Re: [PATCH 08/15] drm/sun4i: Fix polarity configuration for DW HDMI PHY

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Message-ID: <2043407.cqGGRsJjYq@jernej-laptop>
Date:   Mon, 26 Feb 2018 17:19:58 +0100
From:   Jernej Škrabec <jernej.skrabec@...l.net>
To:     Maxime Ripard <maxime.ripard@...tlin.com>
Cc:     wens@...e.org, airlied@...ux.ie, robh+dt@...nel.org,
        mark.rutland@....com, mturquette@...libre.com, sboyd@...nel.org,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH 08/15] drm/sun4i: Fix polarity configuration for DW HDMI PHY

Hi,

Dne ponedeljek, 26. februar 2018 ob 10:39:30 CET je Maxime Ripard napisal(a):
> Hi,
> 
> On Sat, Feb 24, 2018 at 10:45:38PM +0100, Jernej Skrabec wrote:
> > Current polarity configuration code is cleary wrong since it compares
> > same flag two times. However, even if flag name is fixed, it won't work
> > well for resolutions which have one polarity positive and another
> > negative.
> > 
> > Fix that by properly set each bit according to each polarity. Since
> > those two bits are not described in any documentation, relationships
> > were obtained by experimentation.
> > 
> > Fixes: b7c7436a5ff0 ("drm/sun4i: Implement A83T HDMI driver")
> > 
> > Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>
> > ---
> > 
> >  drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c | 9 +++++----
> >  1 file changed, 5 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
> > b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c index e5bfcdd43ec9..f48e8b70fabe
> > 100644
> > --- a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
> > +++ b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
> > @@ -35,10 +35,11 @@ static int sun8i_hdmi_phy_config(struct dw_hdmi *hdmi,
> > void *data,> 
> >  	struct sun8i_hdmi_phy *phy = (struct sun8i_hdmi_phy *)data;
> >  	u32 val = 0;
> > 
> > -	if ((mode->flags & DRM_MODE_FLAG_NHSYNC) &&
> > -	    (mode->flags & DRM_MODE_FLAG_NHSYNC)) {
> > -		val = 0x03;
> > -	}
> > +	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
> > +		val |= 0x01;
> > +
> > +	if (mode->flags & DRM_MODE_FLAG_NVSYNC)
> > +		val |= 0x02;
> 
> Can you introduce defines for those?

Of course.

Best regards,
Jernej