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drm/amd/display: Add refresh rate trace

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When we have to debug VRR issues, we usually want to know the current
refresh rate; for this reason, it is handy to have a way to check in
real-time the refresh rate value. This commit introduces a kernel trace
that can provide such information.

Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Acked-by: Anson Jacob <Anson.Jacob@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Rodrigo Siqueira
2021-03-10 10:04:56 -05:00
committed by Alex Deucher
parent 95574c6961
commit 4758823355
3 changed files with 34 additions and 0 deletions
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14
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@@ -460,6 +460,9 @@ static void dm_vupdate_high_irq(void *interrupt_params)
struct common_irq_params *irq_params = interrupt_params;
struct amdgpu_device *adev = irq_params->adev;
struct amdgpu_crtc *acrtc;
struct drm_device *drm_dev;
struct drm_vblank_crtc *vblank;
ktime_t frame_duration_ns, previous_timestamp;
unsigned long flags;
int vrr_active;
@@ -467,6 +470,17 @@ static void dm_vupdate_high_irq(void *interrupt_params)
if (acrtc) {
vrr_active = amdgpu_dm_vrr_active_irq(acrtc);
drm_dev = acrtc->base.dev;
vblank = &drm_dev->vblank[acrtc->base.index];
previous_timestamp = atomic64_read(&irq_params->previous_timestamp);
frame_duration_ns = vblank->time - previous_timestamp;
if (frame_duration_ns > 0) {
trace_amdgpu_refresh_rate_track(acrtc->base.index,
frame_duration_ns,
ktime_divns(NSEC_PER_SEC, frame_duration_ns));
atomic64_set(&irq_params->previous_timestamp, vblank->time);
}
DRM_DEBUG_VBL("crtc:%d, vupdate-vrr:%d\n",
acrtc->crtc_id,