Re: [PATCH AUTOSEL 5.15 123/188] drm/tegra: dc: rgb: Allow changing PLLD rate on Tegra30+

[Sasha Levin]

On Tue, Jan 18, 2022 at 12:39:43PM +0300, Dmitry Osipenko wrote:
> 18.01.2022 12:37, Dmitry Osipenko пишет:
> > 18.01.2022 05:30, Sasha Levin пишет:
> > > From: Dmitry Osipenko <digetx@xxxxxxxxx>
> > >
> > > [ Upstream commit 0c921b6d4ba06bc899fd84d3ce1c1afd3d00bc1c ]
> > >
> > > Asus Transformer TF700T is a Tegra30 tablet device which uses RGB->DSI
> > > bridge that requires a precise clock rate in order to operate properly.
> > > Tegra30 has a dedicated PLL for each display controller, hence the PLL
> > > rate can be changed freely. Allow PLL rate changes on Tegra30+ for RGB
> > > output. Configure the clock rate before display controller is enabled
> > > since DC itself may be running off this PLL and it's not okay to change
> > > the rate of the active PLL that doesn't support dynamic frequency
> > > switching since hardware will hang.
> > >
> > > Tested-by: Maxim Schwalm <maxim.schwalm@xxxxxxxxx> #TF700T
> > > Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
> > > Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
> > > Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
> > > ---
> > >  drivers/gpu/drm/tegra/dc.c  | 27 ++++++++++++--------
> > >  drivers/gpu/drm/tegra/dc.h  |  1 +
> > >  drivers/gpu/drm/tegra/rgb.c | 49 +++++++++++++++++++++++++++++++++++--
> > >  3 files changed, 65 insertions(+), 12 deletions(-)
> >
> > Hi,
> >
> > This patch shouldn't be ported to any stable kernel because h/w that
> > needs this patch was just merged to the 5.17.
>
> * support of h/w that needs..

I'll drop it, thanks!

--
Thanks,
Sasha