target/linux/bcm27xx/patches-5.4/950-0210-arm-bcm2835-DMA-can-only-address-1GB.patch

   1 From 67b31f71da2c251860dc6ddeffc5d15f8a74c675 Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.org>
   3 Date: Wed, 29 May 2019 15:47:42 +0100
   4 Subject: [PATCH] arm: bcm2835: DMA can only address 1GB
   5
   6 The legacy peripherals can only address the first gigabyte of RAM, so
   7 ensure that DMA allocations are restricted to that region.
   8
   9 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
  10 ---
  11  arch/arm/mach-bcm/board_bcm2835.c | 3 +++
  12  1 file changed, 3 insertions(+)
  13
  14 --- a/arch/arm/mach-bcm/board_bcm2835.c
  15 +++ b/arch/arm/mach-bcm/board_bcm2835.c
  16 @@ -114,6 +114,9 @@ static const char * const bcm2835_compat
  17  };
  18
  19  DT_MACHINE_START(BCM2835, "BCM2835")
  20 +#if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE)
  21 +       .dma_zone_size  = SZ_1G,
  22 +#endif
  23         .map_io = bcm2835_map_io,
  24         .init_machine = bcm2835_init,
  25         .dt_compat = bcm2835_compat,