On Thu, Sep 26, 2024 at 04:09:03PM GMT, Alexander Stein wrote:
> Hi Dmitry,
>
> Am Donnerstag, 26. September 2024, 08:05:56 CEST schrieb Dmitry Baryshkov:
> > On Thu, Sep 26, 2024 at 07:55:51AM GMT, Alexander Stein wrote:
> > > From: Matthias Schiffer <matthias.schiffer@xxxxxxxxxxxx>
> > >
> > > The PIXCLK needs to be enabled in SCFG before accessing certain DCU
> > > registers, or the access will hang. For simplicity, the PIXCLK is enabled
> > > unconditionally, resulting in increased power consumption.
> >
> > By this description it looks like a fix. What is the first broken
> > commit? It needs to be mentioned in the Fixes: tag. Or is it hat
> > existing devices have been enabling SCFG in some other way?
>
> We discussed this internally and it seems this never worked, unless PIXCLK
> was already enabled in SCFG by a different way, e.g. firmware, etc.
My bet was on the firmware, but I never touched Layerscape platforms.
Anyway,
Fixes: 109eee2f2a18 ("drm/layerscape: Add Freescale DCU DRM driver")
Acked-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
>
> Best regards,
> Alexander
>
> > >
> > > Signed-off-by: Matthias Schiffer <matthias.schiffer@xxxxxxxxxxxx>
> > > Signed-off-by: Alexander Stein <alexander.stein@xxxxxxxxxxxxxxx>
> > > ---
> > > Changes in v2:
> > > * Add note about power consumption in commit message
> > > * Add note about power consumption in comment
> > > * Fix alignment
> > >
> >
> >
>
>
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With best wishes
Dmitry
