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

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Date:   Thu, 3 Oct 2019 15:34:47 +0200
From:   Maxime Ripard <mripard@...nel.org>
To:     Icenowy Zheng <icenowy@...c.io>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Jagan Teki <jagan@...rulasolutions.com>,
        David Airlie <airlied@...ux.ie>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Chen-Yu Tsai <wens@...e.org>, Daniel Vetter <daniel@...ll.ch>
Subject: Re: [linux-sunxi] [PATCH 1/3] Revert "drm/sun4i: dsi: Change the
 start delay calculation"

On Thu, Oct 03, 2019 at 09:21:30PM +0800, Icenowy Zheng wrote:
>
>
> 于 2019年10月3日 GMT+08:00 下午9:19:16, Maxime Ripard <mripard@...nel.org> 写到:
> >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@...c.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@...rulasolutions.com>
> >
> >The commit log was better in this one. I ended up merging this one,
> >with your R-b.
>
> Please note that Jagan's v11 3/7 is still needed.

Right, unfortunately, it doesn't apply anymore.

Jagan, can you send that patch rebased?

Thanks!
Maxime

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