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Commit 5a0afd4b authored by Deepak S's avatar Deepak S Committed by Daniel Vetter
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drm/i915/chv: Use timeout mode for RC6 on chv 



Higher RC6 residency is observed using timeout mode
instead of EI mode. It's Recommended to use TO Method for RC6.

v2: Add comment about timeout threshold. (Tom)

Signed-off-by: default avatarDeepak S <deepak.s@linux.intel.com>
Reviewed-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent c61200c2

drivers/gpu/drm/i915/intel_pm.c

+3 −2
Original line number Diff line number Diff line
@@ -4689,7 +4689,8 @@ static void cherryview_enable_rps(struct drm_device *dev) 
		I915_WRITE(RING_MAX_IDLE(ring->mmio_base), 10);

	I915_WRITE(GEN6_RC_SLEEP, 0);



	I915_WRITE(GEN6_RC6_THRESHOLD, 50000); /* 50/125ms per EI */

	/* TO threshold set to 1750 us ( 0x557 * 1.28 us) */

	I915_WRITE(GEN6_RC6_THRESHOLD, 0x557);



	/* allows RC6 residency counter to work */

	I915_WRITE(VLV_COUNTER_CONTROL,
@@ -4703,7 +4704,7 @@ static void cherryview_enable_rps(struct drm_device *dev) 
	/* 3: Enable RC6 */

	if ((intel_enable_rc6(dev) & INTEL_RC6_ENABLE) &&

						(pcbr >> VLV_PCBR_ADDR_SHIFT))

		rc6_mode = GEN6_RC_CTL_EI_MODE(1);

		rc6_mode = GEN7_RC_CTL_TO_MODE;



	I915_WRITE(GEN6_RC_CONTROL, rc6_mode);