drm/i915/glk: Implement WaDDIIOTimeout

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>
Link: http://patchwork.freedesktop.org/patch/msgid/20170222063431.10060-5-ander.conselvan.de.oliveira@intel.com

drivers/gpu/drm/i915/i915_drv.h

@@ -2787,6 +2787,12 @@ 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

drivers/gpu/drm/i915/i915_reg.h

@@ -6479,6 +6479,11 @@ 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)

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)