Re: Patch submission to Freescale kernel

[Gary Bisson <bisson.gary@gmail.com>]

Eric, All,

On 12/02/2014 07:05 AM, Eric Nelson wrote:
> Hi Gary,
>
> On 12/01/2014 09:18 PM, Gary Bisson wrote:
>> Hi,
>>
>> I was wondering what was the procedure to submit a patch to the
>> Freescale maintained kernel:
>> http://git.freescale.com/git/cgit.cgi/imx/linux-2.6-imx.git/
>>
>> I've just made a patch that fixes the display issue for rev T1.0 of the
>> SoC which has been previously reported:
>> https://lists.yoctoproject.org/pipermail/meta-freescale/2014-May/008553.html
>>
>> "mxc_sdc_fb fb.27: timeout when waiting for flip irq"
>>
>> Then, I'd like to send that patch over to the fslc and mainline kernels
>> as they seem to have the issue by checking their source code.
>>
> Cool! That discussion on i.MX Community ended with the realization
> that the issue was specific to TO 1.0 silicon.
>
> Are you running on that silicon version? (this is shown in the first
> few lines of U-Boot output)

Yes I confirm I am running on this revision and the (ridiculously small) 
patch happens in those IMX_CHIP_REVISION test cases.

>> Regarding the mainline kernel, I can't seem to get the HDMI (on
>> nitrogen6x) to work at all no matter which revision/board I use. Looking
>> into the source code I've seen the evolution of the
>> drivers/staging/imx-drm driver which tends to say that HDMI is
>> supported. If so, would anyone have some insights on which command line
>> to pass the kernel in order to get the mainline kernel to recognize the
>> HDMI display properly. So far the init seems to be fine but fb0 sysfs
>> modes is just rubbish.
>> [    1.863506] imx-drm display-subsystem: bound imx-ipuv3-crtc.0 (ops
>> ipu_crtc_ops)
>> [    1.863719] imx-drm display-subsystem: bound imx-ipuv3-crtc.1 (ops
>> ipu_crtc_ops)
>> [    1.863955] imx-drm display-subsystem: bound imx-ipuv3-crtc.4 (ops
>> ipu_crtc_ops)
>> [    1.864168] imx-drm display-subsystem: bound imx-ipuv3-crtc.5 (ops
>> ipu_crtc_ops)
>> [    1.867758] imx-hdmi 120000.hdmi: Detected HDMI controller
>> 0x13:0xa:0xa0:0xc1
>> [    1.868066] imx-drm display-subsystem: bound 120000.hdmi (ops hdmi_ops)
>> [    1.868537] imx-drm display-subsystem: bound
>> 2000000.aips-bus:ldb@020e0008 (ops imx_ldb_ops)
>>
> Hmmm. This worked for me the last time I checked (using Shawn's tree).
>
> I'll double check and report back.

Great thanks! I suspect my command line to be wrong though as I think 
mxcfb0 video parameters do not apply on mainline.

But I'll try out Fabio's suggestion of removing the LVDS node.

Thanks,
Gary