package/kernel/mac80211/patches/319-v4.12-0030-brcmfmac-properly-align-buffers-on-certain-platforms.patch

   1 From 6e84ab604bdedaa16239bd1c6e5fcb5660309f02 Mon Sep 17 00:00:00 2001
   2 From: Heiner Kallweit <hkallweit1@gmail.com>
   3 Date: Wed, 5 Apr 2017 20:33:26 +0200
   4 Subject: [PATCH] brcmfmac: properly align buffers on certain platforms with 64
   5  bit DMA
   6
   7 Systems with 64 bit DMA at least partially require buffers to be used
   8 for DMA to be 8-byte-aligned. One example is Amlogic Meson GX.
   9 Switching the MMC/SDIO driver for this platform to SG DMA mode
  10 resulted in problems due to unaligned buffers.
  11
  12 Fortunately the brcmfmac driver has a global define for the alignment.
  13 Changing it to 8 fixed the issues with Meson GX.
  14
  15 Suggested-by: Helmut Klein <hgkr.klein@gmail.com>
  16 Tested-by: Helmut Klein <hgkr.klein@gmail.com>
  17 Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
  18 Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
  19 ---
  20  drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c | 4 ++++
  21  1 file changed, 4 insertions(+)
  22
  23 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
  24 +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
  25 @@ -539,7 +539,11 @@ static int qcount[NUMPRIO];
  26  /* Limit on rounding up frames */
  27  static const uint max_roundup = 512;
  28
  29 +#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
  30 +#define ALIGNMENT  8
  31 +#else
  32  #define ALIGNMENT  4
  33 +#endif
  34
  35  enum brcmf_sdio_frmtype {
  36         BRCMF_SDIO_FT_NORMAL,