mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-27 17:18:59 +00:00
31 lines
1016 B
Diff
31 lines
1016 B
Diff
|
From 121fdf16a2ff4cf651c376a37eeca255544c47fd Mon Sep 17 00:00:00 2001
|
||
|
|
From: Phil Elwell <phil@raspberrypi.com>
|
||
|
|
Date: Thu, 27 Aug 2020 17:57:18 +0100
|
||
|
|
Subject: [PATCH] ARM: dts: bcm2835: Use the L2 non-allocating alias
|
||
|
|
|
||
|
|
The /soc/dma-ranges property on BCM2835 currently results in DMA
|
||
|
|
addresses in the range 0x40000000-0x5fffffff. This will allocate in the
|
||
|
|
system L2 cache, which may adversely affect performance.
|
||
|
|
|
||
|
|
Change the dma-ranges property to give addresses in the range
|
||
|
|
0x80000000-0x9fffffff, which are coherent with L2 but non-allocating.
|
||
|
|
|
||
|
|
See: https://github.com/raspberrypi/linux/issues/3602
|
||
|
|
|
||
|
|
Signed-off-by: Phil Elwell <phil@raspberrypi.com>
|
||
|
|
---
|
||
|
|
arch/arm/boot/dts/bcm2835.dtsi | 2 +-
|
||
|
|
1 file changed, 1 insertion(+), 1 deletion(-)
|
||
|
|
|
||
|
|
--- a/arch/arm/boot/dts/bcm2835.dtsi
|
||
|
|
+++ b/arch/arm/boot/dts/bcm2835.dtsi
|
||
|
|
@@ -18,7 +18,7 @@
|
||
|
|
|
||
|
|
soc {
|
||
|
|
ranges = <0x7e000000 0x20000000 0x02000000>;
|
||
|
|
- dma-ranges = <0x40000000 0x00000000 0x20000000>;
|
||
|
|
+ dma-ranges = <0x80000000 0x00000000 0x20000000>;
|
||
|
|
};
|
||
|
|
|
||
|
|
arm-pmu {
|