[Freedreno] Whether A200 driver is supported by Linux Mainline Kernel

[abhijit]

Hi All,

This is to inform that we managed to get the 3D driver working on Karo board
The issue was with u-boot. In u-boot code of Karo, 
CCM_CMEOR.MOD_EN_OV_GPU was set to 0
CCM_CCGR5.gpu_clk_enable was set to 0

After changing above register bits to one, I am able to get GPU ID

Thank you very much for your help


On Monday 11 December 2017 05:07 PM, abhijit wrote:
> Hi All,
> 
> Just to update,
> 
> Karo doesn't have support 2.6.35 Linux Kernel
> 
> However I observed that even w.r.t u-boot, tx53 based board returns zero 
> as GPU ID and QSRB board returns proper GPU ID
> 
> Regards,
>    Abhijit
> 
> On Friday 24 November 2017 10:43 AM, abhijit wrote:
>> Hi all,
>>
>> @Wladimir, Thank you very much for you kind response.
>>
>> I am planning to boot older version of linux kernel(2.6) on Karo board 
>> and use reverse engineering tools to get any GPU related settings.
>>
>> Please let me know what are the important settings I have to look 
>> into, that may be useful to address the issue of GPU chip ID becoming 
>> zero.
>>
>> Regards,
>>     Abhijit
>>
>> On Thursday 16 November 2017 03:42 PM, Wladimir J. van der Laan wrote:
>>> Hello abhijit,
>>>
>>> On Thu, Nov 16, 2017 at 01:02:21PM +0530, abhijit wrote:
>>>> Hi Wladimir,
>>>>
>>>> Thank you very much for you response.
>>>>
>>>> I am using the kernel which is provided by you and I was able to
>>>> successfully get the GPU driver on to imx53 based QSRB board.
>>>>
>>>> I am using the same kernel for imx53 based tx53 board from karo, but 
>>>> I am
>>>> having issue with getting GPU ID
>>>>
>>>> Interestingly imx53.dtsi is common for both imx53-tx53-x13x.dts and
>>>> imx53-qsrb.dts.
>>>>
>>>> imx53.dtsi contains DTS entries for GPU and clocks.
>>>>
>>>> I verified that clock values are same for both qsrb and tx53. Only 
>>>> thing I
>>>> have to verify is if GPU completely powered on. Can you please let 
>>>> me know
>>>> how to ensure this?
>>>
>>> Unfortunately I don't know, I've never been involved in that side of 
>>> board
>>> bringup, I just write (mostly user space) graphics drivers.
>>>
>>> Regards,
>>> Wladimir
>>>