From 2a39b072ee6990512ff0829a4eba5b409dff2746 Mon Sep 17 00:00:00 2001
From: Imre Deak <imre.deak@intel.com>
Date: Thu, 14 Nov 2019 17:26:21 +0200
Subject: drm/i915: Restore GT coarse power gating workaround
Git-commit: 2a39b072ee6990512ff0829a4eba5b409dff2746
Patch-mainline: v5.5-rc1
References: bsc#1152489
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: c113236718e8 ("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 980f87a2edb3e7825949ebd0a7e63ab574c20816)
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---
drivers/gpu/drm/i915/gt/intel_rc6.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_rc6.c b/drivers/gpu/drm/i915/gt/intel_rc6.c
index 4bbf28ce29c4..700104b90163 100644
--- a/drivers/gpu/drm/i915/gt/intel_rc6.c
+++ b/drivers/gpu/drm/i915/gt/intel_rc6.c
@@ -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)
--
2.28.0