Re: [PATCH v6 04/18] video: tegra20: dc: pass DC id to internal devices

["Thierry Reding" <thierry.reding@gmail.com>]

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On Fri Apr 19, 2024 at 6:44 PM CEST, Svyatoslav Ryhel wrote:
> пт, 19 квіт. 2024 р. о 19:38 Thierry Reding <thierry.reding@gmail.com> пише:
> >
> > On Tue Jan 23, 2024 at 6:16 PM CET, Svyatoslav Ryhel wrote:
> > > Tegra SoC has 2 independent display controllers called DC_A and
> > > DC_B, they are handled differently by internal video devices like
> > > DSI and HDMI controllers so it is important for last to know
> > > which display controller is used to properly set up registers.
> > > To achieve this, a pipe field was added to pdata to pass display
> > > controller id to internal Tegra SoC devices.
> > >
> > > Tested-by: Agneli <poczt@protonmail.ch> # Toshiba AC100 T20
> > > Tested-by: Robert Eckelmann <longnoserob@gmail.com> # ASUS TF101
> > > Tested-by: Andreas Westman Dorcsak <hedmoo@yahoo.com> # ASUS Grouper E1565
> > > Tested-by: Ion Agorria <ion@agorria.com> # HTC One X
> > > Tested-by: Svyatoslav Ryhel <clamor95@gmail.com> # Nvidia Tegratab T114
> > > Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
> > > ---
> > >  drivers/video/tegra20/tegra-dc.c | 6 ++++++
> > >  drivers/video/tegra20/tegra-dc.h | 3 +++
> > >  2 files changed, 9 insertions(+)
> > >
> > > diff --git a/drivers/video/tegra20/tegra-dc.c b/drivers/video/tegra20/tegra-dc.c
> > > index 5d8874f323..0e94e665ef 100644
> > > --- a/drivers/video/tegra20/tegra-dc.c
> > > +++ b/drivers/video/tegra20/tegra-dc.c
> > > @@ -45,6 +45,7 @@ struct tegra_lcd_priv {
> > >       unsigned pixel_clock;           /* Pixel clock in Hz */
> > >       int dc_clk[2];                  /* Contains clk and its parent */
> > >       bool rotation;                  /* 180 degree panel turn */
> > > +     bool pipe;                      /* DC controller: 0 for A, 1 for B */
> >
> > Bool is a poor choice, even if there's only two of them. This is a
> > proper index, so it should be some sort of integer.
> >
> > Also, the device tree bindings for the display controller specify a
> > "nvidia,head" property that can be used to identify these. If you add
> > that to the U-Boot DT you can avoid looking up by name to map this
> > value.
> >
>
> Thanks for pointing to this property. May we apply this patch set as is
> since it is well tested and confirmed to work and I will prepare a follow
> up patches to adjust device tree relations? Would what be ok?

Well, there's a few other things that I think should be addressed, but
if you'd like to keep this one patch as-is and clean this up later, I
guess that's fine.

Thierry

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