target/linux/brcm2708/patches-4.19/950-0148-Increase-firmware-call-buffer-size-to-48-bytes.patch

   1 From 3118f1a2f29ae802a334963c2aded87d60bddd56 Mon Sep 17 00:00:00 2001
   2 From: James Hughes <james.hughes@raspberrypi.org>
   3 Date: Wed, 31 Oct 2018 13:00:46 +0000
   4 Subject: [PATCH 148/806] Increase firmware call buffer size to 48 bytes
   5
   6 An assumption was made in commit a1547e0bc that 32 bytes
   7 would be enough data buffer size for all firmware calls. However,
   8 the axi performance monitor driver uses a call with 44 bytes
   9 (RPI_FIRMWARE_GET_PERIPH_REG) to get the VC registers values.
  10
  11 Increase value to 48 to take this in to account.
  12
  13 Signed-off-by: James Hughes <james.hughes@raspberrypi.org>
  14 ---
  15  drivers/firmware/raspberrypi.c | 2 +-
  16  1 file changed, 1 insertion(+), 1 deletion(-)
  17
  18 --- a/drivers/firmware/raspberrypi.c
  19 +++ b/drivers/firmware/raspberrypi.c
  20 @@ -22,7 +22,7 @@
  21  #define MBOX_DATA28(msg)               ((msg) & ~0xf)
  22  #define MBOX_CHAN_PROPERTY             8
  23
  24 -#define MAX_RPI_FW_PROP_BUF_SIZE       32
  25 +#define MAX_RPI_FW_PROP_BUF_SIZE       48
  26
  27  static struct platform_device *rpi_hwmon;
  28