Re: Rcar-du Initialization errors on Koelsch

[Cao Minh Hiep <cm-hiep@jinso.co.jp>]

Hi Laurent-san

Thanks for your replying.

On 2015年02月24日 08:47, Laurent Pinchart wrote:
> Hi Hiep-san,
>
> On Monday 23 February 2015 14:08:16 Cao Minh Hiep wrote:
>> Hi Laurent-san
>> I am Hiep from Jinzai Solution.
>>
>> We have tested the linux ver 3.19 on Koelsch, we found some error
>> messages from Rcar-Du as show below:
>> The error messages:
>> "[drm] Initialized drm 1.1.0 20060810
>>    rcar-du feb00000.display: Failed to initialize drm fb helper.
>>    rcar-du feb00000.display: failed to initialize DRM/KMS
>>    rcar-du: probe of feb00000.display failed with error -22"
>>
>> Then, we find out these patches as below are causing of this bug:
>> 0ee56d4 ARM: shmobile: koelsch: Enable DU device in DT
>> 910343e ARM: shmobile: koelsch-reference: Remove DU platform device
> This is due to the fact that no connector has been instantiated. The error
> message is pretty confusing, I'll submit a patch to make it clearer, but it
> won't fix the issue.
>
> With the platform data based DU instantiation the Lager and Koelsch board file
> contained LVDS panel information, and the DU driver instantiated one LVDS
> connector. I wanted to replicate that when moving to DT, but the approach has
> been rejected during review due to the fact that the panel isn't part of the
> Lager and Koelsch boards, and thus shouldn't be described in r8a7790-lager.dts
> or r8a7791-koelsch.dts.
Thanks. I understood.
> I've thus created a separate DT file (r8a77xx-aa104xd12-panel.dtsi) to
> describe the panel, which can be included directly in r8a7790-lager.dts or
> r8a7791-koelsch.dts as in the following patch.
>
> Please note that the patch won't be upstreamed due to the reason explained
> above.
Ok, I see.

Best Regards,
Jinso/Hiep