[U-Boot] [PATCH 1/2 v2] Exynos5800: The Peach-Pi board does not have a Parade video bridge

[Ajay kumar]

Hi All,

On Tue, Dec 2, 2014 at 2:00 AM, Simon Glass <sjg at chromium.org> wrote:
> Hi Sjoerd,
>
> On 1 December 2014 at 13:25, Sjoerd Simons
> <sjoerd.simons at collabora.co.uk> wrote:
>> On Mon, 2014-12-01 at 13:09 -0700, Simon Glass wrote:
>>> +Akshay
>>>
>>> Hi Sjoerd,
>>>
>>> On 1 December 2014 at 03:03, Sjoerd Simons
>>> <sjoerd.simons at collabora.co.uk> wrote:
>>> > Hey Simon,
>>> >
>>> > On Sun, 2014-11-30 at 11:56 -0700, Simon Glass wrote:
>>> >> On 27 November 2014 at 08:08, Sjoerd Simons
>>> >> <sjoerd.simons at collabora.co.uk> wrote:
>>> >> > Unlike the Peach-Pit board, there is no parade edp to lvds bridge on the
>>> >> > Pi. So drop it from  device-tree
>>> >> >
>>> >> > Signed-off-by: Sjoerd Simons <sjoerd.simons at collabora.co.uk>
>>> >> > ---
>>> >> >  Changes since v1: Only modify the DTB
>>> >> >
>>> >> >  arch/arm/dts/exynos5800-peach-pi.dts | 5 -----
>>> >> >  1 file changed, 5 deletions(-)
>>> >>
>>> >> Acked-by: Simon Glass <sjg at chromium.org>
>>> >>
>>> >> Tested on snow, pit, pi (display does not yet work on Pi).
>>> >
>>> > Just to be clear, in your testing does the display not work on Pi? It
>>> > seems to be ok here (with u-boot starting chainloaded from one of the
>>> > KERN partitions)
>>>
>>> That's right, not in U-Boot. I think this is because some GPIOs need
>>> to be enabled to turn on the backlight etc. Maybe you have an EC which
>>> turns these on automatically?
>>>
>>> If current mainline is supposed to make the display work on Pi then I
>>> need to do some debugging. Please let me know.
>>
>> It does work on my machine, so i was wondering if it's a setup
>> difference. I'm using the chained u-boot method (iotw the standard
>> chromeos u-boot in flash starts main-line u-boot from mmc/SD), which
>> might well mean that the GPIOs you're referring to are still turned on
>> by the first u-boot (which it has to do to show me the unverified boot
>> warning screen)?
>
> Yes that's right. Maybe Akshay / Ajay have ideas, or otherwise I can
> add this. I think it is two GPIOs, but it might be TPSCHROME also.
Now, I have added support for peach_pi display in u-boot.
Kindly check the patches.

Ajay