intel_crtc_get_vblank_counter is used in many places in the display tracing infrastructure. For a clean execution of the tracing assignment, ensure that any necessary HW reads would not further trigger another trace, to prevent nesting of trace events. Suggested-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx> Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@xxxxxxxxx> --- drivers/gpu/drm/i915/display/intel_vblank.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_vblank.c b/drivers/gpu/drm/i915/display/intel_vblank.c index f5659ebd08eb..55f3389fa220 100644 --- a/drivers/gpu/drm/i915/display/intel_vblank.c +++ b/drivers/gpu/drm/i915/display/intel_vblank.c @@ -103,7 +103,7 @@ u32 i915_get_vblank_counter(struct drm_crtc *crtc) * we get a low value that's stable across two reads of the high * register. */ - frame = intel_de_read64_2x32(dev_priv, PIPEFRAMEPIXEL(pipe), PIPEFRAME(pipe)); + frame = intel_de_read64_2x32_notrace(dev_priv, PIPEFRAMEPIXEL(pipe), PIPEFRAME(pipe)); pixel = frame & PIPE_PIXEL_MASK; frame = (frame >> PIPE_FRAME_LOW_SHIFT) & 0xffffff; @@ -125,7 +125,7 @@ u32 g4x_get_vblank_counter(struct drm_crtc *crtc) if (!vblank->max_vblank_count) return 0; - return intel_de_read(dev_priv, PIPE_FRMCOUNT_G4X(pipe)); + return intel_de_read_notrace(dev_priv, PIPE_FRMCOUNT_G4X(pipe)); } static u32 intel_crtc_scanlines_since_frame_timestamp(struct intel_crtc *crtc) @@ -324,7 +324,8 @@ static bool i915_get_crtc_scanoutpos(struct drm_crtc *_crtc, * We can split this into vertical and horizontal * scanout position. */ - position = (intel_de_read_fw(dev_priv, PIPEFRAMEPIXEL(pipe)) & PIPE_PIXEL_MASK) >> PIPE_PIXEL_SHIFT; + position = (intel_de_read_fw_notrace(dev_priv, PIPEFRAMEPIXEL(pipe)) & + PIPE_PIXEL_MASK) >> PIPE_PIXEL_SHIFT; /* convert to pixel counts */ vbl_start *= htotal; -- 2.34.1
