brcm2708: update to latest patches from RPi foundation

[openwrt/staging/dedeckeh.git] / target / linux / brcm2708 / patches-4.19 / 950-0506-drm-v3d-Skip-MMU-flush-if-the-device-is-currently-of.patch

diff --git a/target/linux/brcm2708/patches-4.19/950-0506-drm-v3d-Skip-MMU-flush-if-the-device-is-currently-of.patch b/target/linux/brcm2708/patches-4.19/950-0506-drm-v3d-Skip-MMU-flush-if-the-device-is-currently-of.patch
new file mode 100644 (file)
index 0000000..57f8e50
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0506-drm-v3d-Skip-MMU-flush-if-the-device-is-currently-of.patch
@@ -0,0 +1,52 @@
+From f389abea861f9bd3165f98a8d3a1f3407e9fc01a Mon Sep 17 00:00:00 2001
+From: Eric Anholt <eric@anholt.net>
+Date: Mon, 14 Jan 2019 12:35:43 -0800
+Subject: [PATCH] drm/v3d: Skip MMU flush if the device is currently
+ off.
+
+If it's off, we know it will be reset on poweron, so the MMU won't
+have any TLB cached from before this point.  Avoids failed waits for
+MMU flush to reply.
+
+Signed-off-by: Eric Anholt <eric@anholt.net>
+(cherry picked from commit 3ee4e2e0a9e9587eacbb69b067bbc72ab2cdc47b)
+---
+ drivers/gpu/drm/v3d/v3d_mmu.c | 13 +++++++++++++
+ 1 file changed, 13 insertions(+)
+
+--- a/drivers/gpu/drm/v3d/v3d_mmu.c
++++ b/drivers/gpu/drm/v3d/v3d_mmu.c
+@@ -18,6 +18,8 @@
+  * each client.  This is not yet implemented.
+  */
+ 
++#include <linux/pm_runtime.h>
++
+ #include "v3d_drv.h"
+ #include "v3d_regs.h"
+ 
+@@ -34,6 +36,14 @@ static int v3d_mmu_flush_all(struct v3d_
+ {
+       int ret;
+ 
++      /* Keep power on the device on until we're done with this
++       * call, but skip the flush if the device is off and will be
++       * reset when powered back on.
++       */
++      ret = pm_runtime_get_if_in_use(v3d->dev);
++      if (ret == 0)
++              return 0;
++
+       /* Make sure that another flush isn't already running when we
+        * start this one.
+        */
+@@ -61,6 +71,9 @@ static int v3d_mmu_flush_all(struct v3d_
+       if (ret)
+               dev_err(v3d->dev, "MMUC flush wait idle failed\n");
+ 
++      pm_runtime_mark_last_busy(v3d->dev);
++      pm_runtime_put_autosuspend(v3d->dev);
++
+       return ret;
+ }
+