Messages in this thread Patch in this message | | | From | Eric Anholt <> | Subject | [PATCH v3 3/3] drm/v3d: Make sure the GPU is on when measuring clocks. | Date | Wed, 20 Feb 2019 15:36:58 -0800 |
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You'll get garbage measurements if the registers always read back 0xdeadbeef
Signed-off-by: Eric Anholt <eric@anholt.net> --- drivers/gpu/drm/v3d/v3d_debugfs.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/drivers/gpu/drm/v3d/v3d_debugfs.c b/drivers/gpu/drm/v3d/v3d_debugfs.c index eb2b2d2f8553..a24af2d2f574 100644 --- a/drivers/gpu/drm/v3d/v3d_debugfs.c +++ b/drivers/gpu/drm/v3d/v3d_debugfs.c @@ -187,6 +187,11 @@ static int v3d_measure_clock(struct seq_file *m, void *unused) uint32_t cycles; int core = 0; int measure_ms = 1000; + int ret; + + ret = pm_runtime_get_sync(v3d->dev); + if (ret < 0) + return ret; if (v3d->ver >= 40) { V3D_CORE_WRITE(core, V3D_V4_PCTR_0_SRC_0_3, @@ -210,6 +215,9 @@ static int v3d_measure_clock(struct seq_file *m, void *unused) cycles / (measure_ms * 1000), (cycles / (measure_ms * 100)) % 10); + pm_runtime_mark_last_busy(v3d->dev); + pm_runtime_put_autosuspend(v3d->dev); + return 0; } -- 2.20.1
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