drm/i915: wire up CRC interrupt for ilk/snb

We enable the interrupt unconditionally and only control it
through the enable bit in the CRC control register.

v2: Extract per-platform helpers to compute the register values.
Reviewed-by: NDamien Lespiau <damien.lespiau@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_debugfs.c

@@ -1914,6 +1914,7 @@ static const char * const pipe_crc_sources[] = {
 	"plane1",
 	"plane2",
 	"pf",
+	"pipe",
 };
 
 static const char *pipe_crc_source_name(enum intel_pipe_crc_source source)
@@ -1942,14 +1943,61 @@ static int display_crc_ctl_open(struct inode *inode, struct file *file)
 	return single_open(file, display_crc_ctl_show, dev);
 }
 
+static int ilk_pipe_crc_ctl_reg(enum intel_pipe_crc_source source,
+				uint32_t *val)
+{
+	switch (source) {
+	case INTEL_PIPE_CRC_SOURCE_PLANE1:
+		*val = PIPE_CRC_ENABLE | PIPE_CRC_SOURCE_PRIMARY_ILK;
+		break;
+	case INTEL_PIPE_CRC_SOURCE_PLANE2:
+		*val = PIPE_CRC_ENABLE | PIPE_CRC_SOURCE_SPRITE_ILK;
+		break;
+	case INTEL_PIPE_CRC_SOURCE_PF:
+		return -EINVAL;
+	case INTEL_PIPE_CRC_SOURCE_PIPE:
+		*val = PIPE_CRC_ENABLE | PIPE_CRC_SOURCE_PIPE_ILK;
+		break;
+	default:
+		*val = 0;
+		break;
+	}
+
+	return 0;
+}
+
+static int ivb_pipe_crc_ctl_reg(enum intel_pipe_crc_source source,
+				uint32_t *val)
+{
+	switch (source) {
+	case INTEL_PIPE_CRC_SOURCE_PLANE1:
+		*val = PIPE_CRC_ENABLE | PIPE_CRC_SOURCE_PRIMARY_IVB;
+		break;
+	case INTEL_PIPE_CRC_SOURCE_PLANE2:
+		*val = PIPE_CRC_ENABLE | PIPE_CRC_SOURCE_SPRITE_IVB;
+		break;
+	case INTEL_PIPE_CRC_SOURCE_PF:
+		*val = PIPE_CRC_ENABLE | PIPE_CRC_SOURCE_PF_IVB;
+		break;
+	case INTEL_PIPE_CRC_SOURCE_PIPE:
+		return -EINVAL;
+	default:
+		*val = 0;
+		break;
+	}
+
+	return 0;
+}
+
 static int pipe_crc_set_source(struct drm_device *dev, enum pipe pipe,
 			       enum intel_pipe_crc_source source)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_pipe_crc *pipe_crc = &dev_priv->pipe_crc[pipe];
 	u32 val;
+	int ret;
 
-	if (!IS_IVYBRIDGE(dev))
+	if (!(IS_IVYBRIDGE(dev) || IS_GEN5(dev) || IS_GEN6(dev)))
 		return -ENODEV;
 
 	if (pipe_crc->source == source)
@@ -1959,6 +2007,14 @@ static int pipe_crc_set_source(struct drm_device *dev, enum pipe pipe,
 	if (pipe_crc->source && source)
 		return -EINVAL;
 
+	if (IS_GEN5(dev) || IS_GEN6(dev))
+		ret = ilk_pipe_crc_ctl_reg(source, &val);
+	else
+		ret = ivb_pipe_crc_ctl_reg(source, &val);
+
+	if (ret != 0)
+		return ret;
+
 	/* none -> real source transition */
 	if (source) {
 		DRM_DEBUG_DRIVER("collecting CRCs for pipe %c, %s\n",
@@ -1976,22 +2032,6 @@ static int pipe_crc_set_source(struct drm_device *dev, enum pipe pipe,
 
 	pipe_crc->source = source;
 
-	switch (source) {
-	case INTEL_PIPE_CRC_SOURCE_PLANE1:
-		val = PIPE_CRC_ENABLE | PIPE_CRC_SOURCE_PRIMARY_IVB;
-		break;
-	case INTEL_PIPE_CRC_SOURCE_PLANE2:
-		val = PIPE_CRC_ENABLE | PIPE_CRC_SOURCE_SPRITE_IVB;
-		break;
-	case INTEL_PIPE_CRC_SOURCE_PF:
-		val = PIPE_CRC_ENABLE | PIPE_CRC_SOURCE_PF_IVB;
-		break;
-	case INTEL_PIPE_CRC_SOURCE_NONE:
-	default:
-		val = 0;
-		break;
-	}
-
 	I915_WRITE(PIPE_CRC_CTL(pipe), val);
 	POSTING_READ(PIPE_CRC_CTL(pipe));
 

drivers/gpu/drm/i915/i915_drv.h

@@ -1223,6 +1223,7 @@ enum intel_pipe_crc_source {
 	INTEL_PIPE_CRC_SOURCE_PLANE1,
 	INTEL_PIPE_CRC_SOURCE_PLANE2,
 	INTEL_PIPE_CRC_SOURCE_PF,
+	INTEL_PIPE_CRC_SOURCE_PIPE,
 	INTEL_PIPE_CRC_SOURCE_MAX,
 };
 

drivers/gpu/drm/i915/i915_irq.c

@@ -1240,8 +1240,22 @@ static void ivb_pipe_crc_update(struct drm_device *dev, enum pipe pipe)
 				I915_READ(PIPE_CRC_RES_5_IVB(pipe)),
 				I915_READ(PIPEFRAME(pipe)));
 }
+
+static void ilk_pipe_crc_update(struct drm_device *dev, enum pipe pipe)
+{
+	struct drm_i915_private *dev_priv = dev->dev_private;
+
+	display_pipe_crc_update(dev, pipe,
+				I915_READ(PIPE_CRC_RES_RED_ILK(pipe)),
+				I915_READ(PIPE_CRC_RES_GREEN_ILK(pipe)),
+				I915_READ(PIPE_CRC_RES_BLUE_ILK(pipe)),
+				I915_READ(PIPE_CRC_RES_RES1_ILK(pipe)),
+				I915_READ(PIPE_CRC_RES_RES2_ILK(pipe)),
+				I915_READ(PIPEFRAME(pipe)));
+}
 #else
 static inline void ivb_pipe_crc_update(struct drm_device *dev, int pipe) {}
+static inline void ilk_pipe_crc_update(struct drm_device *dev, int pipe) {}
 #endif
 
 /* The RPS events need forcewake, so we add them to a work queue and mask their
@@ -1524,6 +1538,12 @@ static void ilk_display_irq_handler(struct drm_device *dev, u32 de_iir)
 		if (intel_set_cpu_fifo_underrun_reporting(dev, PIPE_B, false))
 			DRM_DEBUG_DRIVER("Pipe B FIFO underrun\n");
 
+	if (de_iir & DE_PIPEA_CRC_DONE)
+		ilk_pipe_crc_update(dev, PIPE_A);
+
+	if (de_iir & DE_PIPEB_CRC_DONE)
+		ilk_pipe_crc_update(dev, PIPE_B);
+
 	if (de_iir & DE_PLANEA_FLIP_DONE) {
 		intel_prepare_page_flip(dev, 0);
 		intel_finish_page_flip_plane(dev, 0);
@@ -2500,8 +2520,10 @@ static int ironlake_irq_postinstall(struct drm_device *dev)
 	} else {
 		display_mask = (DE_MASTER_IRQ_CONTROL | DE_GSE | DE_PCH_EVENT |
 				DE_PLANEA_FLIP_DONE | DE_PLANEB_FLIP_DONE |
-				DE_AUX_CHANNEL_A | DE_PIPEB_FIFO_UNDERRUN |
-				DE_PIPEA_FIFO_UNDERRUN | DE_POISON);
+				DE_AUX_CHANNEL_A |
+				DE_PIPEB_FIFO_UNDERRUN | DE_PIPEA_FIFO_UNDERRUN |
+				DE_PIPEB_CRC_DONE | DE_PIPEA_CRC_DONE |
+				DE_POISON);
 		extra_mask = DE_PIPEA_VBLANK | DE_PIPEB_VBLANK | DE_PCU_EVENT;
 	}
 

drivers/gpu/drm/i915/i915_reg.h

@@ -3918,12 +3918,14 @@
 #define DE_PIPEB_ODD_FIELD      (1 << 13)
 #define DE_PIPEB_LINE_COMPARE   (1 << 12)
 #define DE_PIPEB_VSYNC          (1 << 11)
+#define DE_PIPEB_CRC_DONE	(1 << 10)
 #define DE_PIPEB_FIFO_UNDERRUN  (1 << 8)
 #define DE_PIPEA_VBLANK         (1 << 7)
 #define DE_PIPEA_EVEN_FIELD     (1 << 6)
 #define DE_PIPEA_ODD_FIELD      (1 << 5)
 #define DE_PIPEA_LINE_COMPARE   (1 << 4)
 #define DE_PIPEA_VSYNC          (1 << 3)
+#define DE_PIPEA_CRC_DONE	(1 << 2)
 #define DE_PIPEA_FIFO_UNDERRUN  (1 << 0)
 
 /* More Ivybridge lolz */