[Intel-gfx] [PATCH 4/4] drm/i915: Make intel_get_crtc_scanline use no trace hw reads

[Radhakrishna Sripada]

intel_get_crtc_scanline is used in the display tracing infrastructure.
Use no trace hw reads to avoid nested tracing calls.

Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada at intel.com>
---
 drivers/gpu/drm/i915/display/intel_vblank.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_vblank.c b/drivers/gpu/drm/i915/display/intel_vblank.c
index 55f3389fa220..0b8574b29f1c 100644
--- a/drivers/gpu/drm/i915/display/intel_vblank.c
+++ b/drivers/gpu/drm/i915/display/intel_vblank.c
@@ -150,17 +150,17 @@ static u32 intel_crtc_scanlines_since_frame_timestamp(struct intel_crtc *crtc)
 		 * pipe frame time stamp. The time stamp value
 		 * is sampled at every start of vertical blank.
 		 */
-		scan_prev_time = intel_de_read_fw(dev_priv,
-						  PIPE_FRMTMSTMP(crtc->pipe));
+		scan_prev_time = intel_de_read_fw_notrace(dev_priv,
+							  PIPE_FRMTMSTMP(crtc->pipe));
 
 		/*
 		 * The TIMESTAMP_CTR register has the current
 		 * time stamp value.
 		 */
-		scan_curr_time = intel_de_read_fw(dev_priv, IVB_TIMESTAMP_CTR);
+		scan_curr_time = intel_de_read_fw_notrace(dev_priv, IVB_TIMESTAMP_CTR);
 
-		scan_post_time = intel_de_read_fw(dev_priv,
-						  PIPE_FRMTMSTMP(crtc->pipe));
+		scan_post_time = intel_de_read_fw_notrace(dev_priv,
+							  PIPE_FRMTMSTMP(crtc->pipe));
 	} while (scan_post_time != scan_prev_time);
 
 	return div_u64(mul_u32_u32(scan_curr_time - scan_prev_time,
@@ -217,7 +217,7 @@ static int __intel_get_crtc_scanline(struct intel_crtc *crtc)
 	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 		vtotal /= 2;
 
-	position = intel_de_read_fw(dev_priv, PIPEDSL(pipe)) & PIPEDSL_LINE_MASK;
+	position = intel_de_read_fw_notrace(dev_priv, PIPEDSL(pipe)) & PIPEDSL_LINE_MASK;
 
 	/*
 	 * On HSW, the DSL reg (0x70000) appears to return 0 if we
@@ -236,7 +236,8 @@ static int __intel_get_crtc_scanline(struct intel_crtc *crtc)
 
 		for (i = 0; i < 100; i++) {
 			udelay(1);
-			temp = intel_de_read_fw(dev_priv, PIPEDSL(pipe)) & PIPEDSL_LINE_MASK;
+			temp = intel_de_read_fw_notrace(dev_priv, PIPEDSL(pipe)) &
+			       PIPEDSL_LINE_MASK;
 			if (temp != position) {
 				position = temp;
 				break;
-- 
2.34.1