brcm2708: add linux 4.19 support

Boot tested on Raspberry Pi B+ (BCM2708) and Raspberry Pi 2 (BCM2709)

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 52 insertions, 0 deletions

diff --git a/target/linux/brcm2708/patches-4.19/950-0587-drm-v3d-Skip-MMU-flush-if-the-device-is-currently-of.patch b/target/linux/brcm2708/patches-4.19/950-0587-drm-v3d-Skip-MMU-flush-if-the-device-is-currently-of.patch
new file mode 100644
index 0000000000..01c64d2c45
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0587-drm-v3d-Skip-MMU-flush-if-the-device-is-currently-of.patch
@@ -0,0 +1,52 @@
+From 2e3f1f0991163004ea441307ab52ce4ea3e068d7 Mon Sep 17 00:00:00 2001
+From: Eric Anholt <eric@anholt.net>
+Date: Mon, 14 Jan 2019 12:35:43 -0800
+Subject: [PATCH 587/703] 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;
+ }
+