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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>
hifive-unleashed-5.2
Eric Anholt 2019-02-20 15:36:58 -08:00
parent a7dde1b7a5
commit 935f3d8843
1 changed files with 8 additions and 0 deletions
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8
drivers/gpu/drm/v3d/v3d_debugfs.c
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@ -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;
}