[PATCH] drm/i915/gt: Automate CCS Mode setting during engine resets

[Andi Shyti]

Hi,

On Fri, Apr 26, 2024 at 02:07:23AM +0200, Andi Shyti wrote:
> We missed setting the CCS mode during resume and engine resets.
> Create a workaround to be added in the engine's workaround list.
> This workaround sets the XEHP_CCS_MODE value at every reset.
> 
> The issue can be reproduced by running:
> 
>   $ clpeak --kernel-latency
> 
> Without resetting the CCS mode, we encounter a fence timeout:
> 
>   Fence expiration time out i915-0000:03:00.0:clpeak[2387]:2!
> 
> Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/10895
> Fixes: 6db31251bb26 ("drm/i915/gt: Enable only one CCS for compute workload")
> Reported-by: Gnattu OC <gnattuoc at me.com>
> Signed-off-by: Andi Shyti <andi.shyti at linux.intel.com>
> Cc: Chris Wilson <chris.p.wilson at linux.intel.com>
> Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
> Cc: Matt Roper <matthew.d.roper at intel.com>
> Cc: <stable at vger.kernel.org> # v6.2+

based on the discussion on the issue and as agreed with Gnattu:

Tested-by: Gnattu OC <gnattuoc at me.com>

Thank you again, gnattu,
Andi