[Letux-kernel] GTA04 display and 5.10-rc5

[H. Nikolaus Schaller]

Hi Tomi and Andreas,

> Am 30.11.2020 um 13:29 schrieb Tomi Valkeinen <tomi.valkeinen at ti.com>:
> 
> On 30/11/2020 12:35, H. Nikolaus Schaller wrote:
> 
>> So this makes it clear that it is the new omapdrm-mipi-dsi series which I
>> have started to integrate into letux-5.10-rc5.
>> 
>> This series seems to break drivers/gpu/drm/panel/panel-tpo-td028ttec1.c
>> while the Letux3704 uses one of the drivers/gpu/drm/panel/panel-simple.c
>> definitions. This explains why there is another difference between your
>> devices.
>> 
>> So something in Tomis series seems to break DPI with the specific driver.
>> The same may happen for VENC so we have to look at it as well.
> 
> I tested my DSI series with omap4 panda (DVI output via DPI), and it works both with modules and
> built-in. So at least it's not totally broken.

A first assessment:
prepare and enable are called properly and write spi commands to the panel.

It seems some upstream patch between 5.10-rc3 and 5.10-rc6 which breaks the
GTA04/OMAP3 display. Maybe also something in gpio-spi or gpio so that the
panel stays in reset state.

I will now bisect.

The other thing is the instable boot. Have observed several times now.

BR,
Nikolaus