drm/i915: Sample the frame counter instead of a timestamp for CRCs

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_debugfs.c

@@ -1748,14 +1748,14 @@ static int i915_pipe_crc(struct seq_file *m, void *data)
 		return 0;
 	}
 
-	seq_puts(m, " timestamp     CRC1     CRC2     CRC3     CRC4     CRC5\n");
+	seq_puts(m, "  frame    CRC1     CRC2     CRC3     CRC4     CRC5\n");
 	head = atomic_read(&pipe_crc->head);
 	tail = atomic_read(&pipe_crc->tail);
 
 	while (CIRC_CNT(head, tail, INTEL_PIPE_CRC_ENTRIES_NR) >= 1) {
 		struct intel_pipe_crc_entry *entry = &pipe_crc->entries[tail];
 
-		seq_printf(m, "%12u %8x %8x %8x %8x %8x\n", entry->timestamp,
+		seq_printf(m, "%8u %8x %8x %8x %8x %8x\n", entry->frame,
 			   entry->crc[0], entry->crc[1], entry->crc[2],
 			   entry->crc[3], entry->crc[4]);
 

drivers/gpu/drm/i915/i915_drv.h

@@ -1226,7 +1226,7 @@ enum intel_pipe_crc_source {
 };
 
 struct intel_pipe_crc_entry {
-	uint32_t timestamp;
+	uint32_t frame;
 	uint32_t crc[5];
 };
 

drivers/gpu/drm/i915/i915_irq.c

@@ -1195,8 +1195,7 @@ static void ivb_pipe_crc_update(struct drm_device *dev, enum pipe pipe)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_pipe_crc *pipe_crc = &dev_priv->pipe_crc[pipe];
 	struct intel_pipe_crc_entry *entry;
-	ktime_t now;
-	int ts, head, tail;
+	int head, tail;
 
 	head = atomic_read(&pipe_crc->head);
 	tail = atomic_read(&pipe_crc->tail);
@@ -1208,10 +1207,7 @@ static void ivb_pipe_crc_update(struct drm_device *dev, enum pipe pipe)
 
 	entry = &pipe_crc->entries[head];
 
-	now = ktime_get();
-	ts = ktime_to_us(now);
-
-	entry->timestamp = ts;
+	entry->frame = I915_READ(PIPEFRAME(pipe));
 	entry->crc[0] = I915_READ(PIPE_CRC_RES_1_IVB(pipe));
 	entry->crc[1] = I915_READ(PIPE_CRC_RES_2_IVB(pipe));
 	entry->crc[2] = I915_READ(PIPE_CRC_RES_3_IVB(pipe));