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| author | Eric Anholt <eric@anholt.net> | 2019-02-20 15:36:58 -0800 |
|---|---|---|
| committer | Eric Anholt <eric@anholt.net> | 2019-03-08 08:59:35 -0800 |
| commit | 935f3d88434b564985bb5f7457852f8d7a21752a (patch) | |
| tree | 0222cec55bb26e46412103eef4eb848a78062d48 /drivers | |
| parent | a7dde1b7a5c9adf13d422240d02b812952660a35 (diff) | |
| download | linux-935f3d88434b564985bb5f7457852f8d7a21752a.tar.bz2 | |
drm/v3d: Make sure the GPU is on when measuring clocks.
You'll get garbage measurements if the registers always read back
0xdeadbeef
Signed-off-by: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20190220233658.986-3-eric@anholt.net
Reviewed-by: Dave Emett <david.emett@broadcom.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/v3d/v3d_debugfs.c | 8 |
1 files changed, 8 insertions, 0 deletions
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; } |