[PATCH] drm/stm: ltdc: reset controller to avoid partial refresh

[Benjamin Gaignard]

Le ven. 5 avr. 2019 à 18:31, Philippe CORNU <philippe.cornu at st.com> a écrit :
>
>
>
> On 4/3/19 11:24 AM, Yannick Fertré wrote:
> > Display controller reset must be done as soon as possible after enable
> > the clock to avoid partial refresh on screen.
> >
> > Signed-off-by: Yannick Fertré <yannick.fertre at st.com>
> > ---
> >   drivers/gpu/drm/stm/ltdc.c | 12 ++++++------
> >   1 file changed, 6 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
> > index 32fd6a3..7bbe61c 100644
> > --- a/drivers/gpu/drm/stm/ltdc.c
> > +++ b/drivers/gpu/drm/stm/ltdc.c
> > @@ -1134,6 +1134,12 @@ int ltdc_load(struct drm_device *ddev)
> >               return -ENODEV;
> >       }
> >
> > +     if (!IS_ERR(rstc)) {
> > +             reset_control_assert(rstc);
> > +             usleep_range(10, 20);
> > +             reset_control_deassert(rstc);
> > +     }
> > +
> >       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> >       ldev->regs = devm_ioremap_resource(dev, res);
> >       if (IS_ERR(ldev->regs)) {
> > @@ -1156,12 +1162,6 @@ int ltdc_load(struct drm_device *ddev)
> >               }
> >       }
> >
> > -     if (!IS_ERR(rstc)) {
> > -             reset_control_assert(rstc);
> > -             usleep_range(10, 20);
> > -             reset_control_deassert(rstc);
> > -     }
> > -
>
> Dear Yannick,
> Thank you for your patch,
>
> Acked-by: Philippe Cornu <philippe.cornu at st.com>

Applied on drm-misc-next after doing a rebase.
Thanks,
Benjamin
>
> Philippe :)
>
> >       /* Disable interrupts */
> >       reg_clear(ldev->regs, LTDC_IER,
> >                 IER_LIE | IER_RRIE | IER_FUIE | IER_TERRIE);
> >
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