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drm/amd/display: Add refresh rate trace 

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
View File

@ -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,

1
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
View File

@ -66,6 +66,7 @@ struct dc_plane_state;
struct common_irq_params {
struct amdgpu_device *adev;
enum dc_irq_source irq_src;
atomic64_t previous_timestamp;
};
/**

19
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_trace.h
View File

@ -618,6 +618,25 @@ TRACE_EVENT(amdgpu_dmub_trace_high_irq,
__entry->param0, __entry->param1)
);
TRACE_EVENT(amdgpu_refresh_rate_track,
TP_PROTO(int crtc_index, ktime_t refresh_rate_ns, uint32_t refresh_rate_hz),
TP_ARGS(crtc_index, refresh_rate_ns, refresh_rate_hz),
TP_STRUCT__entry(
__field(int, crtc_index)
__field(ktime_t, refresh_rate_ns)
__field(uint32_t, refresh_rate_hz)
),
TP_fast_assign(
__entry->crtc_index = crtc_index;
__entry->refresh_rate_ns = refresh_rate_ns;
__entry->refresh_rate_hz = refresh_rate_hz;
),
TP_printk("crtc_index=%d refresh_rate=%dHz (%lld)",
__entry->crtc_index,
__entry->refresh_rate_hz,
__entry->refresh_rate_ns)
);
#endif /* _AMDGPU_DM_TRACE_H_ */
#undef TRACE_INCLUDE_PATH