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path: root/target/linux/brcm2708/patches-4.19/950-0504-drm-v3d-Make-sure-the-GPU-is-on-when-measuring-clock.patch
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Diffstat (limited to 'target/linux/brcm2708/patches-4.19/950-0504-drm-v3d-Make-sure-the-GPU-is-on-when-measuring-clock.patch')
-rw-r--r--target/linux/brcm2708/patches-4.19/950-0504-drm-v3d-Make-sure-the-GPU-is-on-when-measuring-clock.patch38
1 files changed, 38 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0504-drm-v3d-Make-sure-the-GPU-is-on-when-measuring-clock.patch b/target/linux/brcm2708/patches-4.19/950-0504-drm-v3d-Make-sure-the-GPU-is-on-when-measuring-clock.patch
new file mode 100644
index 0000000000..30cb228964
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0504-drm-v3d-Make-sure-the-GPU-is-on-when-measuring-clock.patch
@@ -0,0 +1,38 @@
+From 19846d53c32be7c9d8d46b369910374c5ea9b9d5 Mon Sep 17 00:00:00 2001
+From: Eric Anholt <eric@anholt.net>
+Date: Mon, 14 Jan 2019 17:26:04 -0800
+Subject: [PATCH] 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>
+---
+ drivers/gpu/drm/v3d/v3d_debugfs.c | 8 ++++++++
+ 1 file changed, 8 insertions(+)
+
+--- 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_
+ 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_
+ cycles / (measure_ms * 1000),
+ (cycles / (measure_ms * 100)) % 10);
+
++ pm_runtime_mark_last_busy(v3d->dev);
++ pm_runtime_put_autosuspend(v3d->dev);
++
+ return 0;
+ }
+