linux-kernel - Re: [PATCH 0/3] drm/sun4i: dsi: misc timing fixes

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Date:   Thu, 03 Oct 2019 11:58:42 +0800
From:   Icenowy Zheng <icenowy@...c.io>
To:     Maxime Ripard <mripard@...nel.org>
Cc:     Chen-Yu Tsai <wens@...e.org>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: Re: [PATCH 0/3] drm/sun4i: dsi: misc timing fixes

在 2019-10-02三的 12:36 +0200，Maxime Ripard写道：
> Hi,
> 
> On Tue, Oct 01, 2019 at 04:02:50PM +0800, Icenowy Zheng wrote:
> > This patchset fixes some portion of timing calculation in
> > sun6i_mipi_dsi
> > driver according to the BSP driver.
> > 
> > Two of the patches are reverting, one is fixing some misread of the
> > BSP
> > source code, another is fixing a wrong refactor that actually
> > breaks the
> > formula.
> > 
> > The other non-reverting patch is fixing a porch error which is
> > usually
> > seen in the original driver commit. Most of porch errors are then
> > fixed,
> > but this one gets ignored.
> > 
> > By applying these patches, several DSI panels are tested to be
> > driven
> > properly by the timing provided by the vendor, including the LCD
> > panel
> > of PinePhone "Don't Be Evil" DevKit, the final PinePhone panel and
> > the
> > panel on PineTab. Without these patches they need dirty timing
> > hacks to
> > work.
> 
> Thanks for going after that issue. Can you provide references to the
> BSP on the various patches?

For patch 1: [1] for setting delay 1 in DSI controller, [2] for setting
real delay in TCON controller.

For patch 2: [3]

Patch 3 is reverting a breaking change, so I didn't check it in the
BSP. It can be verified by mathmatical calculation.

[1] 
https://github.com/ayufan-pine64/linux-pine64/blob/my-hacks-1.2-with-drm/drivers/video/sunxi/disp2/disp/de/lowlevel_sun50iw1/de_dsi.c#L730

[2] 
https://github.com/ayufan-pine64/linux-pine64/blob/my-hacks-1.2-with-drm/drivers/video/sunxi/disp2/disp/de/lowlevel_sun50iw1/de_lcd.c#L369

[3] 
https://github.com/ayufan-pine64/linux-pine64/blob/my-hacks-1.2-with-drm/drivers/video/sunxi/disp2/disp/de/lowlevel_sun50iw1/de_dsi.c#L780

> 
> Ideally, having the panel drivers, and the panel datasheet would
> help.
> 
> Thanks!
> Maxime
> 
> PS: where can we get one of those devices?