X-Git-Url: http://git.openwrt.org/?a=blobdiff_plain;f=target%2Flinux%2Fbrcm2708%2Fpatches-4.19%2F950-0531-drm-v3d-Make-sure-the-GPU-is-on-when-measuring-clock.patch;fp=target%2Flinux%2Fbrcm2708%2Fpatches-4.19%2F950-0531-drm-v3d-Make-sure-the-GPU-is-on-when-measuring-clock.patch;h=30cb228964a52fc969011468e16436dbe33af2c6;hb=67dcc43f3a22dc3a7ac07a7065971b426feeb043;hp=0000000000000000000000000000000000000000;hpb=47a93a810f78adce5a130d287f82b28e9b54313c;p=openwrt%2Fopenwrt.git

diff --git a/target/linux/brcm2708/patches-4.19/950-0531-drm-v3d-Make-sure-the-GPU-is-on-when-measuring-clock.patch b/target/linux/brcm2708/patches-4.19/950-0531-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-4.19/950-0531-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;
+ }
+