[PATCH 1/3] drm/tegra: Align FB pitch

[Thierry Reding]

On Fri, May 23, 2014 at 06:58:32PM -0700, Stéphane Marchesin wrote:
> The display controller doesn't handle non-256 byte aligned buffer
> pitches. If you give it an unaligned buffer, it will stop after the
> first line and will report underflows in the debug registers
> (DC_WINBUF_UFLOW_STATUS and friends). So let's make sure that all our
> framebuffer pitches are 256-byte aligned.
> 
> Signed-off-by: Stéphane Marchesin <marcheu at chromium.org>
> ---
>  drivers/gpu/drm/tegra/drm.h | 2 ++
>  drivers/gpu/drm/tegra/fb.c  | 3 ++-
>  drivers/gpu/drm/tegra/gem.c | 2 ++
>  3 files changed, 6 insertions(+), 1 deletion(-)

Can you point me to where this requirement is documented? I've gone
through the TRM and all I can find is that the line stride needs to be
64 byte aligned. Also I seem to remember that resolutions such as
1366x768 used to work for HDMI at least on earlier Tegra generations.
Perhaps this is a requirement that's new on Tegra124?

Thierry
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