[Intel-gfx] [PATCH] DRM/igd: remove EOS feature

[Shaohua Li]

HW guys have an evaluation about the impact about EOS, and say the impact
is quite small, so they want to remove EOS support. This patch removes EOS
feature.

revert commit 043029655816ed4cfc2ed247020ef97e5d637392
directly reverting it gives a hunk error, so please use this one.

Signed-off-by: Shaohua Li <shaohua.li at intel.com>

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 0887581..36d652d 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -593,27 +593,6 @@ irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
 
 			I915_WRITE(PORT_HOTPLUG_STAT, hotplug_status);
 			I915_READ(PORT_HOTPLUG_STAT);
-
-			/* EOS interrupts occurs */
-			if (IS_IGD(dev) &&
-				(hotplug_status & CRT_EOS_INT_STATUS)) {
-				u32 temp;
-
-				DRM_DEBUG_DRIVER("EOS interrupt occurs\n");
-				/* status is already cleared */
-				temp = I915_READ(ADPA);
-				temp &= ~ADPA_DAC_ENABLE;
-				I915_WRITE(ADPA, temp);
-
-				temp = I915_READ(PORT_HOTPLUG_EN);
-				temp &= ~CRT_EOS_INT_EN;
-				I915_WRITE(PORT_HOTPLUG_EN, temp);
-
-				temp = I915_READ(PORT_HOTPLUG_STAT);
-				if (temp & CRT_EOS_INT_STATUS)
-					I915_WRITE(PORT_HOTPLUG_STAT,
-						CRT_EOS_INT_STATUS);
-			}
 		}
 
 		I915_WRITE(IIR, iir);
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 381cd88..921b5eb 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -852,7 +852,6 @@
 #define   SDVOB_HOTPLUG_INT_EN			(1 << 26)
 #define   SDVOC_HOTPLUG_INT_EN			(1 << 25)
 #define   TV_HOTPLUG_INT_EN			(1 << 18)
-#define   CRT_EOS_INT_EN			(1 << 10)
 #define   CRT_HOTPLUG_INT_EN			(1 << 9)
 #define   CRT_HOTPLUG_FORCE_DETECT		(1 << 3)
 #define CRT_HOTPLUG_ACTIVATION_PERIOD_32	(0 << 8)
@@ -887,7 +886,6 @@
 #define   DPC_HOTPLUG_INT_STATUS		(1 << 28)
 #define   HDMID_HOTPLUG_INT_STATUS		(1 << 27)
 #define   DPD_HOTPLUG_INT_STATUS		(1 << 27)
-#define   CRT_EOS_INT_STATUS			(1 << 12)
 #define   CRT_HOTPLUG_INT_STATUS		(1 << 11)
 #define   TV_HOTPLUG_INT_STATUS			(1 << 10)
 #define   CRT_HOTPLUG_MONITOR_MASK		(3 << 8)
diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
index 9b48a44..0864a2c 100644
--- a/drivers/gpu/drm/i915/intel_crt.c
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -64,34 +64,6 @@ static void intel_crt_dpms(struct drm_encoder *encoder, int mode)
 	}
 
 	I915_WRITE(reg, temp);
-
-	if (IS_IGD(dev)) {
-		if (mode == DRM_MODE_DPMS_OFF) {
-			/* turn off DAC */
-			temp = I915_READ(PORT_HOTPLUG_EN);
-			temp &= ~CRT_EOS_INT_EN;
-			I915_WRITE(PORT_HOTPLUG_EN, temp);
-
-			temp = I915_READ(PORT_HOTPLUG_STAT);
-			if (temp & CRT_EOS_INT_STATUS)
-				I915_WRITE(PORT_HOTPLUG_STAT,
-					CRT_EOS_INT_STATUS);
-		} else {
-			/* turn on DAC. EOS interrupt must be enabled after DAC
-			 * is enabled, so it sounds not good to enable it in
-			 * i915_driver_irq_postinstall()
-			 * wait 12.5ms after DAC is enabled
-			 */
-			msleep(13);
-			temp = I915_READ(PORT_HOTPLUG_STAT);
-			if (temp & CRT_EOS_INT_STATUS)
-				I915_WRITE(PORT_HOTPLUG_STAT,
-					CRT_EOS_INT_STATUS);
-			temp = I915_READ(PORT_HOTPLUG_EN);
-			temp |= CRT_EOS_INT_EN;
-			I915_WRITE(PORT_HOTPLUG_EN, temp);
-		}
-	}
 }
 
 static int intel_crt_mode_valid(struct drm_connector *connector,