From 8aeb7f624fbf8a68a9c67f831d4158a0f80ea920 Mon Sep 17 00:00:00 2001 From: Mika Kuoppala Date: Tue, 7 Jun 2016 17:19:05 +0300 Subject: [PATCH] drm/i915/kbl: Add WaDisableGamClockGating According to bspec we need to disable gam unit clock gating on on kbl revids A0 and B0. References: HSD#2226858, HSD#1944358 Signed-off-by: Mika Kuoppala Reviewed-by: Matthew Auld Link: http://patchwork.freedesktop.org/patch/msgid/1465309159-30531-14-git-send-email-mika.kuoppala@intel.com --- drivers/gpu/drm/i915/i915_reg.h | 1 + drivers/gpu/drm/i915/intel_pm.c | 5 +++++ 2 files changed, 6 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 98f05a2ecc40..4144fb7064f1 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -6938,6 +6938,7 @@ enum skl_disp_power_wells { #define EDRAM_SETS_IDX(cap) (((cap) >> 8) & 0x3) #define GEN6_UCGCTL1 _MMIO(0x9400) +# define GEN6_GAMUNIT_CLOCK_GATE_DISABLE (1 << 22) # define GEN6_EU_TCUNIT_CLOCK_GATE_DISABLE (1 << 16) # define GEN6_BLBUNIT_CLOCK_GATE_DISABLE (1 << 5) # define GEN6_CSUNIT_CLOCK_GATE_DISABLE (1 << 7) diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 64e161fda2e8..afa5eeed5859 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -6983,6 +6983,11 @@ static void kabylake_init_clock_gating(struct drm_device *dev) if (IS_KBL_REVID(dev_priv, 0, KBL_REVID_B0)) I915_WRITE(GEN8_UCGCTL6, I915_READ(GEN8_UCGCTL6) | GEN8_SDEUNIT_CLOCK_GATE_DISABLE); + + /* WaDisableGamClockGating:kbl */ + if (IS_KBL_REVID(dev_priv, 0, KBL_REVID_B0)) + I915_WRITE(GEN6_UCGCTL1, I915_READ(GEN6_UCGCTL1) | + GEN6_GAMUNIT_CLOCK_GATE_DISABLE); } static void skylake_init_clock_gating(struct drm_device *dev) -- 2.20.1