drm: imx: callback after probe deferral not working

Daniel Stone daniel at fooishbar.org
Tue Feb 9 23:35:25 CET 2016

Hi Akshay,

On 9 February 2016 at 22:25, Akshay Bhat <akshay.bhat at timesys.com> wrote:
> On 02/09/2016 04:28 PM, Daniel Stone wrote:
>> On 1 February 2016 at 19:02, Akshay Bhat <akshay.bhat at timesys.com> wrote:
>>> On 02/01/2016 07:11 AM, Liviu Dudau wrote:
>>>> On Fri, Jan 29, 2016 at 05:12:28PM -0500, Akshay Bhat wrote:
>>>>> On 01/28/2016 05:29 PM, Rob Clark wrote:
>>>>> Also from the original log you can see that there are a lot of modules
>>>>> that
>>>>> are loaded after the drm driver does a probe defer, yet there is no
>>>>> entries
>>>>> in the bootlog for the drm driver being re-probed. In the next-20151202
>>>>> kernel log you can see it being re-probed. This points to the drm probe
>>>>> deferral being broken.
>>>> I think your problem is similar to what Tixy has found when testing
>>>> HDLCD,
>>>> which also uses the components API. He has posted a patch here:
>>>> http://www.spinics.net/lists/arm-kernel/msg477090.html
>>>> Russell has added it to his branch, seems to be available in linux-next
>>>> as commit 57480484f9f7631738ef2.
>>> I re-tested with next-20160201 which contains the above patch and still
>>> see
>>> the issue where the re-probe does not work.
>> Could you please try with this patch? The component system was broken
>> (with the same result) in a slightly different way by the same
>> patchset Lixy had to fix; this also kept Rockchip DRM from loading.
>> http://lkml.iu.edu/hypermail/linux/kernel/1602.1/00832.html
> Your patch fixes the above re-probe issue. Thank you very much for reaching
> out with the patch, appreciate your help :)

Russell, looks like there's further component breakage when you defer
inside a bind; IMX and Rockchip are both broken. See the patch I sent
yesterday for this.


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