Re: [PATCH 1/2] drm/exynos: calculate vrefresh instead of use a fixed value

[Gustavo Padovan <gustavo@padovan.org>]

Hi,

2015-05-20 Daniel Stone <daniel@fooishbar.org>:

> Hi,
> 
> On 20 May 2015 at 17:58, Tobias Jakobi <tjakobi@math.uni-bielefeld.de> wrote:
> > On 2015-05-20 16:33, Gustavo Padovan wrote:
> >> When mode's vrefresh is zero we should ask DRM core to calculate vrefresh
> >> for us so we can get the correct value instead of relying on fixed value
> >> defined in a macro.
> >>
> >> Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
> >> ---
> >>  drivers/gpu/drm/exynos/exynos_drm_fimd.c | 3 +--
> >>  1 file changed, 1 insertion(+), 2 deletions(-)
> >>
> >> diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
> >> b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
> >> index 9819fa6..08f7197 100644
> >> --- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
> >> +++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
> >> @@ -42,7 +42,6 @@
> >>   * CPU Interface.
> >>   */
> >>
> >> -#define FIMD_DEFAULT_FRAMERATE 60
> >>  #define MIN_FB_WIDTH_FOR_16WORD_BURST 128
> >>
> >>  /* position control register for hardware window 0, 2 ~ 4.*/
> >> @@ -329,7 +328,7 @@ static bool fimd_mode_fixup(struct exynos_drm_crtc
> >> *crtc,
> >>                 struct drm_display_mode *adjusted_mode)
> >>  {
> >>         if (adjusted_mode->vrefresh == 0)
> >
> > Well, I'm not completly sure how this all works, but shouldn't we check
> > 'mode' here, and not 'adjusted_mode'?
> 
> adjusted_mode is fine; it is pre-populated with the value from mode.
> 'mode' itself _must not_ be modified.
> 
> Mind you, this is missing a hunk to reject entirely invalid modes, i.e.:
> if (adjusted_mode->vrefresh == 0)
>         adjusted_mode->vrefresh = drm_mode_vrefresh(adjusted_mode);
> if (adjusted_mode->vrefresh == 0)
>         return false;

I have sent a v2 with the proposed change. I can't really test this here
as I don't have the hardware where it fails. So in v1 I was just
guessing that it would fix the issue.

	Gustavo
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