[PATCH] drm/sun4i: dsi: Prevent underflow when computing packet sizes

[Maxime Ripard]

On Thu, 11 Aug 2022 22:16:23 -0500, Samuel Holland wrote:
> Currently, the packet overhead is subtracted using unsigned arithmetic.
> With a short sync pulse, this could underflow and wrap around to near
> the maximal u16 value. Fix this by using signed subtraction. The call to
> max() will correctly handle any negative numbers that are produced.
> 
> Apply the same fix to the other timings, even though those subtractions
> are less likely to underflow.
> 
> [...]

Applied to drm/drm-misc (drm-misc-fixes).

Thanks!
Maxime