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drm/i915: Restore GT coarse power gating workaround 

The workaround to disable coarse power gating is still needed on SKL
GT3/GT4 machines and since the RC6 context corruption was discovered by
the hardware team also on all GEN9 machines. Restore applying the
workaround.

Fixes: c113236718 ("drm/i915: Extract GT render sleep (rc6) management")
Testcase: igt/intel_gt_pm_late_selftests/live_rc6_ctx
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Andi Shyti <andi.shyti@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20191114152621.7235-1-imre.deak@intel.com
(cherry picked from commit 980f87a2ed)
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
This commit is contained in:
Imre Deak 2019-11-14 17:26:21 +02:00 committed by Joonas Lahtinen
parent 9faf5fa4d3
commit 2a39b072ee
1 changed files with 7 additions and 2 deletions
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9
drivers/gpu/drm/i915/gt/intel_rc6.c
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@ -178,8 +178,13 @@ static void gen9_rc6_enable(struct intel_rc6 *rc6)
GEN6_RC_CTL_RC6_ENABLE |
rc6_mode);
set(uncore, GEN9_PG_ENABLE,
GEN9_RENDER_PG_ENABLE | GEN9_MEDIA_PG_ENABLE);
/*
* WaRsDisableCoarsePowerGating:skl,cnl
* - Render/Media PG need to be disabled with RC6.
*/
if (!NEEDS_WaRsDisableCoarsePowerGating(rc6_to_i915(rc6)))
set(uncore, GEN9_PG_ENABLE,
GEN9_RENDER_PG_ENABLE | GEN9_MEDIA_PG_ENABLE);
}
static void gen8_rc6_enable(struct intel_rc6 *rc6)