brcm2708: update to latest patches from RPi foundation

[openwrt/staging/chunkeey.git] / target / linux / brcm2708 / patches-4.19 / 950-0504-drm-v3d-Make-sure-the-GPU-is-on-when-measuring-clock.patch

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 (file)
index 0000000..30cb228
--- /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;
+ }
+