target/linux/bcm27xx/patches-5.4/950-0985-ARM-bcm2711-rpi.dts-Unlock-DMA-channels-9-10.patch

   1 From b10a49ab016ed9ac8f231845fb3e83fbf3505652 Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.com>
   3 Date: Mon, 12 Oct 2020 14:36:35 +0100
   4 Subject: [PATCH] ARM: bcm2711-rpi.dts: Unlock DMA channels 9 & 10
   5
   6 The downstream-specific override of the 32-bit DMA mask needlessly
   7 disables channels 9 and 10 - the VPU doesn't use them. This override
   8 is redundant, so delete it.
   9
  10 See: https://github.com/raspberrypi/linux/issues/3896
  11
  12 Signed-off-by: Phil Elwell <phil@raspberrypi.com>
  13 ---
  14  arch/arm/boot/dts/bcm2711-rpi.dtsi | 7 +------
  15  1 file changed, 1 insertion(+), 6 deletions(-)
  16
  17 --- a/arch/arm/boot/dts/bcm2711-rpi.dtsi
  18 +++ b/arch/arm/boot/dts/bcm2711-rpi.dtsi
  19 @@ -246,13 +246,8 @@
  20         };
  21  };
  22
  23 -&dma {
  24 -       /* The VPU firmware uses DMA channel 11 for VCHIQ */
  25 -       brcm,dma-channel-mask = <0x1f5>;
  26 -};
  27 -
  28  &dma40 {
  29 -       /* The VPU firmware DMA channel 11 for VCHIQ */
  30 +       /* The VPU firmware uses DMA channel 11 for VCHIQ */
  31         brcm,dma-channel-mask = <0x7000>;
  32  };
  33