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

[Maxime Ripard <maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>]

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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-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org> 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-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
> > ---
> >  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