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@xxxxxxxxx>
Tested-by: Helmut Klein <hgkr.klein@xxxxxxxxx>
Signed-off-by: Heiner Kallweit <hkallweit1@xxxxxxxxx>
---
drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
index a999f950..fc64b891 100644
--- 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,
--
2.12.1
