[linux-sunxi] [PATCH 1/3] Revert "drm/sun4i: dsi: Change the start delay calculation"

Maxime Ripard mripard at kernel.org
Thu Oct 3 13:19:16 UTC 2019

On Thu, Oct 03, 2019 at 12:38:43PM +0530, Jagan Teki wrote:
> On Tue, Oct 1, 2019 at 1:33 PM Icenowy Zheng <icenowy at aosc.io> wrote:
> >
> > This reverts commit da676c6aa6413d59ab0a80c97bbc273025e640b2.
> >
> > The original commit adds a start parameter to the calculation of the
> > start delay according to some old BSP versions from Allwinner. However,
> > there're two ways to add this delay -- add it in DSI controller or add
> > it in the TCON. Add it in both controllers won't work.
> >
> > The code before this commit is picked from new versions of BSP kernel,
> > which has a comment for the 1 that says "put start_delay to tcon". By
> > checking the sun4i_tcon0_mode_set_cpu() in sun4i_tcon driver, it has
> > already added this delay, so we shouldn't repeat to add the delay in DSI
> > controller, otherwise the timing won't match.
> Thanks for this change. look like this is proper reason for adding +
> 1. also adding bsp code links here might help for future reference.
> Otherwise,
> Reviewed-by: Jagan Teki <jagan at amarulasolutions.com>

The commit log was better in this one. I ended up merging this one,
with your R-b.

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