[PATCH v3 4/6] drm/i915/glk: Implement WaDDIIOTimeout

[Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>]

Implement WaDDIIOTimeout to avoid a timeout when enabling the DDI IO
power domains.

Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h |  6 ++++++
 drivers/gpu/drm/i915/i915_reg.h |  5 +++++
 drivers/gpu/drm/i915/intel_pm.c | 10 ++++++++++
 3 files changed, 21 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 4e7046d..d23069b 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2794,6 +2794,12 @@ intel_info(const struct drm_i915_private *dev_priv)
 #define IS_KBL_REVID(dev_priv, since, until) \
 	(IS_KABYLAKE(dev_priv) && IS_REVID(dev_priv, since, until))
 
+#define GLK_REVID_A0		0x0
+#define GLK_REVID_A1		0x1
+
+#define IS_GLK_REVID(dev_priv, since, until) \
+	(IS_GEMINILAKE(dev_priv) && IS_REVID(dev_priv, since, until))
+
 /*
  * The genX designation typically refers to the render engine, so render
  * capability related checks should use IS_GEN, while display and other checks
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 141a5c1..ce6f096 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6495,6 +6495,11 @@ enum {
 #define CHICKEN_PAR2_1		_MMIO(0x42090)
 #define  KVM_CONFIG_CHANGE_NOTIFICATION_SELECT	(1 << 14)
 
+#define CHICKEN_MISC_2		_MMIO(0x42084)
+#define  GLK_CL0_PWR_DOWN	(1 << 10)
+#define  GLK_CL1_PWR_DOWN	(1 << 11)
+#define  GLK_CL2_PWR_DOWN	(1 << 12)
+
 #define _CHICKEN_PIPESL_1_A	0x420b0
 #define _CHICKEN_PIPESL_1_B	0x420b4
 #define  HSW_FBCQ_DIS			(1 << 22)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 169c490..b38707e 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -114,6 +114,16 @@ static void glk_init_clock_gating(struct drm_i915_private *dev_priv)
 	 */
 	I915_WRITE(GEN9_CLKGATE_DIS_0, I915_READ(GEN9_CLKGATE_DIS_0) |
 		   PWM1_GATING_DIS | PWM2_GATING_DIS);
+
+	/* WaDDIIOTimeout:glk */
+	if (IS_GLK_REVID(dev_priv, 0, GLK_REVID_A1)) {
+		u32 val = I915_READ(CHICKEN_MISC_2);
+		val &= ~(GLK_CL0_PWR_DOWN |
+			 GLK_CL1_PWR_DOWN |
+			 GLK_CL2_PWR_DOWN);
+		I915_WRITE(CHICKEN_MISC_2, val);
+	}
+
 }
 
 static void i915_pineview_get_mem_freq(struct drm_i915_private *dev_priv)
-- 
2.9.3

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