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

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Message-ID: <CAMty3ZCjrM4MajJLyLwt-31mNnfVWghwatogtwVOvCt4gY0LZA@mail.gmail.com>
Date:   Thu, 3 Oct 2019 12:38:43 +0530
From:   Jagan Teki <jagan@...rulasolutions.com>
To:     Icenowy Zheng <icenowy@...c.io>
Cc:     Maxime Ripard <mripard@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [linux-sunxi] [PATCH 1/3] Revert "drm/sun4i: dsi: Change the
 start delay calculation"

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>