[Intel-gfx] [PATCH] drm/1915/guc: enable engine reset on CAT

[Andrzej Hajda]

In case of catastrophic errors GuC is able to initate engine
reset immediately, instead of waiting for timeout.

Signed-off-by: Andrzej Hajda <andrzej.ha...@intel.com>
---
Hi all,

I am new in the subject, so please be polite if this is mistake.
Tests shows that it allows to save about 7 seconds on the machine
(Raptor Lake) in case of CAT.
I am not aware of scenario in which would be reasonable to keep
the engine in hung state.
On the other side I am not sure if there should not be constraints
on firmware version.

Regards
Andrzej
---
 drivers/gpu/drm/i915/gt/uc/intel_guc.c      | 2 +-
 drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.c 
b/drivers/gpu/drm/i915/gt/uc/intel_guc.c
index 27b09ba1d295fc..2adcdf13db1911 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.c
@@ -211,7 +211,7 @@ static u32 guc_ctl_debug_flags(struct intel_guc *guc)
 
 static u32 guc_ctl_feature_flags(struct intel_guc *guc)
 {
-       u32 flags = 0;
+       u32 flags = GUC_CTL_ENABLE_ENGINE_RESET_ON_CAT;
 
        if (!intel_guc_submission_is_used(guc))
                flags |= GUC_CTL_DISABLE_SCHEDULER;
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h 
b/drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h
index e7a7fb450f442a..96f3116e263cdf 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h
@@ -109,6 +109,7 @@
 
 #define GUC_CTL_FEATURE                        2
 #define   GUC_CTL_ENABLE_SLPC          BIT(2)
+#define   GUC_CTL_ENABLE_ENGINE_RESET_ON_CAT BIT(8)
 #define   GUC_CTL_DISABLE_SCHEDULER    BIT(14)
 
 #define GUC_CTL_DEBUG                  3
-- 
2.34.1