Re: [PATCH v1 1/2] drm/i915:skl: Add WaEnableGapsTsvCreditFix

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On 04/08/2015 09:58, Mika Kuoppala wrote:
Ben Widawsky <benjamin.widawsky@xxxxxxxxx> writes:

On Mon, Aug 03, 2015 at 08:24:56PM +0100, Arun Siluvery wrote:
Cc: Ben Widawsky <benjamin.widawsky@xxxxxxxxx>
Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Signed-off-by: Arun Siluvery <arun.siluvery@xxxxxxxxxxxxxxx>
---
  drivers/gpu/drm/i915/i915_reg.h | 3 +++
  drivers/gpu/drm/i915/intel_pm.c | 6 ++++++
  2 files changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 77967ca..8991cd5 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6849,6 +6849,9 @@ enum skl_disp_power_wells {
  #define GEN7_MISCCPCTL			(0x9424)
  #define   GEN7_DOP_CLOCK_GATE_ENABLE	(1<<0)

+#define GEN8_GARBCNTL                   0xB004
+#define   GEN9_GAPS_TSV_CREDIT_DISABLE  (1<<7)
+
  /* IVYBRIDGE DPF */
  #define GEN7_L3CDERRST1			0xB008 /* L3CD Error Status 1 */
  #define HSW_L3CDERRST11			0xB208 /* L3CD Error Status register 1 slice 1 */
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index c23cab6..9152113 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -106,6 +106,12 @@ static void skl_init_clock_gating(struct drm_device *dev)
  		/* WaDisableLSQCROPERFforOCL:skl */
  		I915_WRITE(GEN8_L3SQCREG4, I915_READ(GEN8_L3SQCREG4) |
  			   GEN8_LQSC_RO_PERF_DIS);
+
+	/* WaEnableGapsTsvCreditFix:skl */
+	if (IS_SKYLAKE(dev) && (INTEL_REVID(dev) >= SKL_REVID_C0)) {
+		I915_WRITE(GEN8_GARBCNTL, (I915_READ(GEN8_GARBCNTL) |
+					   GEN9_GAPS_TSV_CREDIT_DISABLE));
+	}
  }

  static void bxt_init_clock_gating(struct drm_device *dev)

FWIW, the docs make it sound like BIOS should be doing this. Did you verify we
actually don't have the bit set with more recent BKC?


I have pretty recent BIOS and the bit was not set.

I checked about this, it should be done in driver.

regards
Arun


Tested-by: Ben Widawsky <ben@xxxxxxxxxxxx>
Reviewed-by: Ben Widawsky <ben@xxxxxxxxxxxx>


Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=90854
Tested-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxx>

--
Ben Widawsky, Intel Open Source Technology Center
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