linux-kernel - Re: [PATCH 11/15] drm/sun4i: tcon: Fix tcon channel 1 backporch calculation

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Message-ID: <20170308085541.p75lt7hmjzbzzpem@lukather>
Date:   Wed, 8 Mar 2017 09:55:41 +0100
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Mike Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH 11/15] drm/sun4i: tcon: Fix tcon channel 1 backporch
 calculation

On Wed, Mar 08, 2017 at 12:25:59PM +0800, Chen-Yu Tsai wrote:
> On Tue, Mar 7, 2017 at 4:56 PM, Maxime Ripard
> <maxime.ripard@...e-electrons.com> wrote:
> > It seems like what's called a backporch in the datasheet is actually the
> > backporch plus the sync period. Fix that in our driver.
> >
> > Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
> > ---
> >  drivers/gpu/drm/sun4i/sun4i_tcon.c | 5 ++---
> >  1 file changed, 2 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c
> > index 93249c5ab1e4..e44217fb4f6f 100644
> > --- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
> > +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
> > @@ -240,15 +240,14 @@ void sun4i_tcon1_mode_set(struct sun4i_tcon *tcon, struct drm_encoder *encoder,
> >                      SUN4I_TCON1_BASIC2_Y(mode->crtc_vdisplay));
> >
> >         /* Set horizontal display timings */
> > -       bp = mode->crtc_htotal - mode->crtc_hsync_end;
> > +       bp = mode->crtc_htotal - mode->crtc_hsync_start;
> >         DRM_DEBUG_DRIVER("Setting horizontal total %d, backporch %d\n",
> >                          mode->htotal, bp);
> >         regmap_write(tcon->regs, SUN4I_TCON1_BASIC3_REG,
> >                      SUN4I_TCON1_BASIC3_H_TOTAL(mode->crtc_htotal) |
> >                      SUN4I_TCON1_BASIC3_H_BACKPORCH(bp));
> >
> > -       /* Set vertical display timings */
> 
> Why remove the comment?

I have no idea :)

This will be fixed. Thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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