2019-09-19 14:43:19 +00:00
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From 19846d53c32be7c9d8d46b369910374c5ea9b9d5 Mon Sep 17 00:00:00 2001
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2019-07-09 18:32:28 +00:00
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From: Eric Anholt <eric@anholt.net>
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Date: Mon, 14 Jan 2019 17:26:04 -0800
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2019-09-19 14:43:19 +00:00
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Subject: [PATCH 578/806] drm/v3d: Make sure the GPU is on when measuring
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2019-07-09 18:32:28 +00:00
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clocks.
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You'll get garbage measurements if the registers always read back
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0xdeadbeef
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Signed-off-by: Eric Anholt <eric@anholt.net>
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---
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drivers/gpu/drm/v3d/v3d_debugfs.c | 8 ++++++++
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1 file changed, 8 insertions(+)
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--- a/drivers/gpu/drm/v3d/v3d_debugfs.c
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+++ b/drivers/gpu/drm/v3d/v3d_debugfs.c
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@@ -187,6 +187,11 @@ static int v3d_measure_clock(struct seq_
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uint32_t cycles;
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int core = 0;
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int measure_ms = 1000;
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+ int ret;
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+
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+ ret = pm_runtime_get_sync(v3d->dev);
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+ if (ret < 0)
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+ return ret;
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if (v3d->ver >= 40) {
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V3D_CORE_WRITE(core, V3D_V4_PCTR_0_SRC_0_3,
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@@ -210,6 +215,9 @@ static int v3d_measure_clock(struct seq_
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cycles / (measure_ms * 1000),
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(cycles / (measure_ms * 100)) % 10);
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+ pm_runtime_mark_last_busy(v3d->dev);
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+ pm_runtime_put_autosuspend(v3d->dev);
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+
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return 0;
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}
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