Using Etnaviv with mxsfb-drm

[Frieder Schrempf]

Hi Lucas,

On 14.12.20 14:06, Lucas Stach wrote:
> Hi Frieder,
> 
> Am Montag, den 14.12.2020, 13:33 +0100 schrieb Frieder Schrempf:
>> Hi Lucas, hi Marek,
>>
>> while doing some tests on i.MX8MM with Etnaviv and mxsfb-drm (using the
>> patches for DSIM, GPC, BLK-CTL, etc., see branch at [1]), I noticed that
>> I don't seem to be able to run glmark2:
>>
>> ~# glmark2-es2-drm
>> =======================================================
>>       glmark2 2017.07
>> =======================================================
>>       OpenGL Information
>>       GL_VENDOR:     etnaviv
>>       GL_RENDERER:   Vivante GC600 rev 4653
>>       GL_VERSION:    OpenGL ES 2.0 Mesa 20.2.4
>> =======================================================
>> [build] use-vbo=false:Error: Failed to create FB: -22
>> Segmentation fault
>>
>> Running a Qt application with the eglfs_kms backend produces a similar
>> error, while running kmscube or applications without GPU rendering works
>> fine.
>>
>> What am I missing? When I used imx-drm, I didn't have any such issues.
>> How is mxsfb-drm different?
> 
> This could have multiple rot causes. First, please make sure that you
> have sufficient CMA memory. Also the eLCDIF hardware has some
> unfortunate restrictions on buffer stride, which surfaced a bug in the
> etnaviv buffer layout code also on some very common display
> resolutions. Please make sure you have [1] applied to get rid of this
> bug.

Great, thanks for pointing that out. Your patch indeed solves the issue 
for me (glmark2 doesn't crash anymore)!

Thanks a lot
Frieder