X-Git-Url: http://git.openwrt.org/?a=blobdiff_plain;f=target%2Flinux%2Fbrcm2708%2Fpatches-4.19%2F950-0616-arm64-mm-Limit-the-DMA-zone-for-arm64.patch;fp=target%2Flinux%2Fbrcm2708%2Fpatches-4.19%2F950-0616-arm64-mm-Limit-the-DMA-zone-for-arm64.patch;h=41261cd0d14acc073cb77fdd95ea050f5d28ad27;hb=84d555aa74434392b682fd9eb0fa701c89a046d6;hp=0000000000000000000000000000000000000000;hpb=953973c2991e8640549a55df7a0574a1abac8644;p=openwrt%2Fstaging%2Fchunkeey.git

diff --git a/target/linux/brcm2708/patches-4.19/950-0616-arm64-mm-Limit-the-DMA-zone-for-arm64.patch b/target/linux/brcm2708/patches-4.19/950-0616-arm64-mm-Limit-the-DMA-zone-for-arm64.patch
new file mode 100644
index 0000000000..41261cd0d1
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0616-arm64-mm-Limit-the-DMA-zone-for-arm64.patch
@@ -0,0 +1,25 @@
+From 2722f08c4c59901bd506184e2dcbbbd532aef0b3 Mon Sep 17 00:00:00 2001
+From: Andrei Gherzan <andrei@balena.io>
+Date: Tue, 16 Jul 2019 13:28:22 +0100
+Subject: [PATCH] arm64/mm: Limit the DMA zone for arm64
+
+On RaspberryPi, only the first 1Gb can be used for DMA[1].
+
+[1] http://lists.infradead.org/pipermail/linux-arm-kernel/2019-July/665986.html
+
+Signed-off-by: Andrei Gherzan <andrei@balena.io>
+---
+ arch/arm64/mm/init.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/arch/arm64/mm/init.c
++++ b/arch/arm64/mm/init.c
+@@ -224,7 +224,7 @@ static void __init reserve_elfcorehdr(vo
+ static phys_addr_t __init max_zone_dma_phys(void)
+ {
+ 	phys_addr_t offset = memblock_start_of_DRAM() & GENMASK_ULL(63, 32);
+-	return min(offset + (1ULL << 32), memblock_end_of_DRAM());
++	return min(offset + (1ULL << 30), memblock_end_of_DRAM());
+ }
+ 
+ #ifdef CONFIG_NUMA