Re: [PATCH v1 1/2] drm/tegra: dc: rgb: Move PCLK shifter programming to CRTC

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

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On Thu, Sep 30, 2021 at 01:28:04AM +0300, Dmitry Osipenko wrote:
> Asus TF700T tablet uses TC358768 DPI->DSI bridge that sits between Tegra's
> DPI output and display panel input. Bridge requires to have stable PCLK
> output before RGB encoder is enabled because it uses PCLK by itself to
> clock internal logic and bridge is programmed before Tegra's encoder is
> enabled. Hence the PCLK clock shifter must be programmed when CRTC is
> enabled, otherwise clock is unstable and bridge hangs because of it.
> Move the shifter programming from RGB encoder into CRTC.
> 
> Tested-by: Maxim Schwalm <maxim.schwalm@gmail.com> #TF700T
> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
> ---
>  drivers/gpu/drm/tegra/dc.c  | 6 ++++++
>  drivers/gpu/drm/tegra/rgb.c | 4 ----
>  2 files changed, 6 insertions(+), 4 deletions(-)

Applied, thanks.

Thierry

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