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- From 6e84ab604bdedaa16239bd1c6e5fcb5660309f02 Mon Sep 17 00:00:00 2001
- From: Heiner Kallweit <hkallweit1@gmail.com>
- Date: Wed, 5 Apr 2017 20:33:26 +0200
- Subject: [PATCH] brcmfmac: properly align buffers on certain platforms with 64
- bit DMA
- Systems with 64 bit DMA at least partially require buffers to be used
- for DMA to be 8-byte-aligned. One example is Amlogic Meson GX.
- Switching the MMC/SDIO driver for this platform to SG DMA mode
- resulted in problems due to unaligned buffers.
- Fortunately the brcmfmac driver has a global define for the alignment.
- Changing it to 8 fixed the issues with Meson GX.
- Suggested-by: Helmut Klein <hgkr.klein@gmail.com>
- Tested-by: Helmut Klein <hgkr.klein@gmail.com>
- Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
- Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
- ---
- drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c | 4 ++++
- 1 file changed, 4 insertions(+)
- --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
- +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
- @@ -540,7 +540,11 @@ static int qcount[NUMPRIO];
- /* Limit on rounding up frames */
- static const uint max_roundup = 512;
-
- +#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
- +#define ALIGNMENT 8
- +#else
- #define ALIGNMENT 4
- +#endif
-
- enum brcmf_sdio_frmtype {
- BRCMF_SDIO_FT_NORMAL,
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