drm/i915: Don't rmw PIPESTAT enable bits

i830 seems to occasionally forget the PIPESTAT enable bits when
we read the register. These aren't the only registers on i830 that
have problems with RMW, as reading the double buffered plane
registers returns the latched value rather than the last written
value. So something similar is perhaps going on with PIPESTAT.

This corruption results on vblank interrupts occasionally turning off
on their own, which leads to vblank timeouts and generally a stuck
display subsystem.

So let's not RMW the pipestat enable bits, and instead use the cached
copy we have around.

Cc: Imre Deak <[e-mail]>
Signed-off-by: Ville Syrjälä <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]
Reviewed-by: Imre Deak <[e-mail]>

drivers/gpu/drm/i915/i915_drv.h

···
 	return dev_priv->vgpu.active;
 }
 
+u32 i915_pipestat_enable_mask(struct drm_i915_private *dev_priv,
+			      enum pipe pipe);
 void
 i915_enable_pipestat(struct drm_i915_private *dev_priv, enum pipe pipe,
 		     u32 status_mask);

drivers/gpu/drm/i915/i915_irq.c

···
 	POSTING_READ(SDEIMR);
 }
 
-static void
-__i915_enable_pipestat(struct drm_i915_private *dev_priv, enum pipe pipe,
-		       u32 enable_mask, u32 status_mask)
+u32 i915_pipestat_enable_mask(struct drm_i915_private *dev_priv,
+			      enum pipe pipe)
 {
-	i915_reg_t reg = PIPESTAT(pipe);
-	u32 pipestat = I915_READ(reg) & PIPESTAT_INT_ENABLE_MASK;
-
-	lockdep_assert_held(&dev_priv->irq_lock);
-	WARN_ON(!intel_irqs_enabled(dev_priv));
-
-	if (WARN_ONCE(enable_mask & ~PIPESTAT_INT_ENABLE_MASK ||
-		      status_mask & ~PIPESTAT_INT_STATUS_MASK,
-		      "pipe %c: enable_mask=0x%x, status_mask=0x%x\n",
-		      pipe_name(pipe), enable_mask, status_mask))
-		return;
-
-	if ((pipestat & enable_mask) == enable_mask)
-		return;
-
-	dev_priv->pipestat_irq_mask[pipe] |= status_mask;
-
-	/* Enable the interrupt, clear any pending status */
-	pipestat |= enable_mask | status_mask;
-	I915_WRITE(reg, pipestat);
-	POSTING_READ(reg);
-}
-
-static void
-__i915_disable_pipestat(struct drm_i915_private *dev_priv, enum pipe pipe,
-		        u32 enable_mask, u32 status_mask)
-{
-	i915_reg_t reg = PIPESTAT(pipe);
-	u32 pipestat = I915_READ(reg) & PIPESTAT_INT_ENABLE_MASK;
-
-	lockdep_assert_held(&dev_priv->irq_lock);
-	WARN_ON(!intel_irqs_enabled(dev_priv));
-
-	if (WARN_ONCE(enable_mask & ~PIPESTAT_INT_ENABLE_MASK ||
-		      status_mask & ~PIPESTAT_INT_STATUS_MASK,
-		      "pipe %c: enable_mask=0x%x, status_mask=0x%x\n",
-		      pipe_name(pipe), enable_mask, status_mask))
-		return;
-
-	if ((pipestat & enable_mask) == 0)
-		return;
-
-	dev_priv->pipestat_irq_mask[pipe] &= ~status_mask;
-
-	pipestat &= ~enable_mask;
-	I915_WRITE(reg, pipestat);
-	POSTING_READ(reg);
-}
-
-static u32 vlv_get_pipestat_enable_mask(struct drm_device *dev, u32 status_mask)
-{
+	u32 status_mask = dev_priv->pipestat_irq_mask[pipe];
 	u32 enable_mask = status_mask << 16;
+
+	lockdep_assert_held(&dev_priv->irq_lock);
+
+	if (INTEL_GEN(dev_priv) < 5)
+		goto out;
 
 	/*
 	 * On pipe A we don't support the PSR interrupt yet,
···
 	if (status_mask & SPRITE1_FLIP_DONE_INT_STATUS_VLV)
 		enable_mask |= SPRITE1_FLIP_DONE_INT_EN_VLV;
 
+out:
+	WARN_ONCE(enable_mask & ~PIPESTAT_INT_ENABLE_MASK ||
+		  status_mask & ~PIPESTAT_INT_STATUS_MASK,
+		  "pipe %c: enable_mask=0x%x, status_mask=0x%x\n",
+		  pipe_name(pipe), enable_mask, status_mask);
+
 	return enable_mask;
 }
 
-void
-i915_enable_pipestat(struct drm_i915_private *dev_priv, enum pipe pipe,
-		     u32 status_mask)
+void i915_enable_pipestat(struct drm_i915_private *dev_priv,
+			  enum pipe pipe, u32 status_mask)
 {
+	i915_reg_t reg = PIPESTAT(pipe);
 	u32 enable_mask;
 
-	if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
-		enable_mask = vlv_get_pipestat_enable_mask(&dev_priv->drm,
-							   status_mask);
-	else
-		enable_mask = status_mask << 16;
-	__i915_enable_pipestat(dev_priv, pipe, enable_mask, status_mask);
+	WARN_ONCE(status_mask & ~PIPESTAT_INT_STATUS_MASK,
+		  "pipe %c: status_mask=0x%x\n",
+		  pipe_name(pipe), status_mask);
+
+	lockdep_assert_held(&dev_priv->irq_lock);
+	WARN_ON(!intel_irqs_enabled(dev_priv));
+
+	if ((dev_priv->pipestat_irq_mask[pipe] & status_mask) == status_mask)
+		return;
+
+	dev_priv->pipestat_irq_mask[pipe] |= status_mask;
+	enable_mask = i915_pipestat_enable_mask(dev_priv, pipe);
+
+	I915_WRITE(reg, enable_mask | status_mask);
+	POSTING_READ(reg);
 }
 
-void
-i915_disable_pipestat(struct drm_i915_private *dev_priv, enum pipe pipe,
-		      u32 status_mask)
+void i915_disable_pipestat(struct drm_i915_private *dev_priv,
+			   enum pipe pipe, u32 status_mask)
 {
+	i915_reg_t reg = PIPESTAT(pipe);
 	u32 enable_mask;
 
-	if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
-		enable_mask = vlv_get_pipestat_enable_mask(&dev_priv->drm,
-							   status_mask);
-	else
-		enable_mask = status_mask << 16;
-	__i915_disable_pipestat(dev_priv, pipe, enable_mask, status_mask);
+	WARN_ONCE(status_mask & ~PIPESTAT_INT_STATUS_MASK,
+		  "pipe %c: status_mask=0x%x\n",
+		  pipe_name(pipe), status_mask);
+
+	lockdep_assert_held(&dev_priv->irq_lock);
+	WARN_ON(!intel_irqs_enabled(dev_priv));
+
+	if ((dev_priv->pipestat_irq_mask[pipe] & status_mask) == 0)
+		return;
+
+	dev_priv->pipestat_irq_mask[pipe] &= ~status_mask;
+	enable_mask = i915_pipestat_enable_mask(dev_priv, pipe);
+
+	I915_WRITE(reg, enable_mask | status_mask);
+	POSTING_READ(reg);
 }
 
 /**
···
 
 	for_each_pipe(dev_priv, pipe) {
 		i915_reg_t reg;
-		u32 mask, iir_bit = 0;
+		u32 status_mask, enable_mask, iir_bit = 0;
 
 		/*
 		 * PIPESTAT bits get signalled even when the interrupt is
···
 		 */
 
 		/* fifo underruns are filterered in the underrun handler. */
-		mask = PIPE_FIFO_UNDERRUN_STATUS;
+		status_mask = PIPE_FIFO_UNDERRUN_STATUS;
 
 		switch (pipe) {
 		case PIPE_A:
···
 			break;
 		}
 		if (iir & iir_bit)
-			mask |= dev_priv->pipestat_irq_mask[pipe];
+			status_mask |= dev_priv->pipestat_irq_mask[pipe];
 
-		if (!mask)
+		if (!status_mask)
 			continue;
 
 		reg = PIPESTAT(pipe);
-		mask |= PIPESTAT_INT_ENABLE_MASK;
-		pipe_stats[pipe] = I915_READ(reg) & mask;
+		pipe_stats[pipe] = I915_READ(reg) & status_mask;
+		enable_mask = i915_pipestat_enable_mask(dev_priv, pipe);
 
 		/*
 		 * Clear the PIPE*STAT regs before the IIR
 		 */
-		if (pipe_stats[pipe] & (PIPE_FIFO_UNDERRUN_STATUS |
-					PIPESTAT_INT_STATUS_MASK))
-			I915_WRITE(reg, pipe_stats[pipe]);
+		if (pipe_stats[pipe])
+			I915_WRITE(reg, enable_mask | pipe_stats[pipe]);
 	}
 	spin_unlock(&dev_priv->irq_lock);
 }

drivers/gpu/drm/i915/intel_fifo_underrun.c

···
 {
 	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
 	i915_reg_t reg = PIPESTAT(crtc->pipe);
-	u32 pipestat = I915_READ(reg) & 0xffff0000;
+	u32 enable_mask;
 
 	lockdep_assert_held(&dev_priv->irq_lock);
 
-	if ((pipestat & PIPE_FIFO_UNDERRUN_STATUS) == 0)
+	if ((I915_READ(reg) & PIPE_FIFO_UNDERRUN_STATUS) == 0)
 		return;
 
-	I915_WRITE(reg, pipestat | PIPE_FIFO_UNDERRUN_STATUS);
+	enable_mask = i915_pipestat_enable_mask(dev_priv, crtc->pipe);
+	I915_WRITE(reg, enable_mask | PIPE_FIFO_UNDERRUN_STATUS);
 	POSTING_READ(reg);
 
 	trace_intel_cpu_fifo_underrun(dev_priv, crtc->pipe);
···
 {
 	struct drm_i915_private *dev_priv = to_i915(dev);
 	i915_reg_t reg = PIPESTAT(pipe);
-	u32 pipestat = I915_READ(reg) & 0xffff0000;
 
 	lockdep_assert_held(&dev_priv->irq_lock);
 
 	if (enable) {
-		I915_WRITE(reg, pipestat | PIPE_FIFO_UNDERRUN_STATUS);
+		u32 enable_mask = i915_pipestat_enable_mask(dev_priv, pipe);
+
+		I915_WRITE(reg, enable_mask | PIPE_FIFO_UNDERRUN_STATUS);
 		POSTING_READ(reg);
 	} else {
-		if (old && pipestat & PIPE_FIFO_UNDERRUN_STATUS)
+		if (old && I915_READ(reg) & PIPE_FIFO_UNDERRUN_STATUS)
 			DRM_ERROR("pipe %c underrun\n", pipe_name(pipe));
 	}
 }