From 1dbf647f31751a4e94fa0435c34f0f5ad5ce0adc Mon Sep 17 00:00:00 2001
From: Arend Van Spriel <arend.vanspriel@broadcom.com>
Date: Fri, 26 May 2017 13:02:55 +0200
Subject: [PATCH] brcmfmac: fix alignment configuration on host using 64-bit
 DMA

For SDIO the alignment requirement for transfers from device to host
is configured in firmware. This configuration is limited to minimum
of 4-byte alignment. However, this is not correct for platforms using
64-bit DMA when the minimum alignment should be 8 bytes. This issue
appeared when the ALIGNMENT definition was set according the DMA
configuration. The configuration in firmware was not using that macro
defintion, but a hardcoded value of 4. Hence the driver reported
alignment failures for data coming from the device and causing
transfers to fail.

Fixes: 6e84ab604bde ("brcmfmac: properly align buffers on certain platforms
Reported-by: Hans de Goede <hdegoede@redhat.com>
Tested-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Hante Meuleman <hante.meuleman@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieter-paul.giesberts@broadcom.com>
Reviewed-by: Franky Lin <franky.lin@broadcom.com>
Signed-off-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
---
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
@@ -3422,7 +3422,7 @@ static int brcmf_sdio_bus_preinit(struct
 		/* otherwise, set txglomalign */
 		value = sdiodev->settings->bus.sdio.sd_sgentry_align;
 		/* SDIO ADMA requires at least 32 bit alignment */
-		value = max_t(u32, value, 4);
+		value = max_t(u32, value, ALIGNMENT);
 		err = brcmf_iovar_data_set(dev, "bus:txglomalign", &value,
 					   sizeof(u32));
 	}
