[Intel-gfx] [PATCH 11/11] drm/i915/tgl: Wa_1607138340

[Chris Wilson]

Quoting Mika Kuoppala (2019-10-15 16:44:49)
> Avoid possible cs hang with semaphores by disabling
> lite restore.
> 
> Signed-off-by: Mika Kuoppala <mika.kuoppala at linux.intel.com>
> ---
>  drivers/gpu/drm/i915/gt/intel_lrc.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
> index 1ef23735c1f6..580d99d18e71 100644
> --- a/drivers/gpu/drm/i915/gt/intel_lrc.c
> +++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
> @@ -1048,6 +1048,10 @@ static u64 execlists_update_context(const struct i915_request *rq)
>         desc = ce->lrc_desc;
>         ce->lrc_desc &= ~CTX_DESC_FORCE_RESTORE;
>  
> +       /* Wa_1607138340:tgl */
> +       if (IS_TGL_REVID(rq->i915, TGL_REVID_A0, TGL_REVID_A0))
> +               desc |= CTX_DESC_FORCE_RESTORE;

This looks much more heavy handed than suggested, but for a0, I'm not
fused.
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
-Chris