linux-kernel - [PATCH v2] net: macb: Clean 64b dma addresses if they are not detected

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Message-Id: <68051905ba59d7cfd74c63ef5bf0830dc2b9f6fe.1537857166.git.michal.simek@xilinx.com>
Date:   Tue, 25 Sep 2018 08:32:50 +0200
From:   Michal Simek <michal.simek@...inx.com>
To:     linux-kernel@...r.kernel.org, monstr@...str.eu,
        "Edgar E. Iglesias" <edgar.iglesias@...inx.com>
Cc:     "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Nicolas Ferre <nicolas.ferre@...rochip.com>
Subject: [PATCH v2] net: macb: Clean 64b dma addresses if they are not detected

Clear ADDR64 dma bit in DMACFG register in case that HW_DMA_CAP_64B is
not detected on 64bit system.
The issue was observed when bootloader(u-boot) does not check macb
feature at DCFG6 register (DAW64_OFFSET) and enabling 64bit dma support
by default. Then macb driver is reading DMACFG register back and only
adding 64bit dma configuration but not cleaning it out.

Signed-off-by: Michal Simek <michal.simek@...inx.com>
---

Changes in v2:
- Clean reg at the first place - Edgar
- Update commit message

 drivers/net/ethernet/cadence/macb_main.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index 16e4ef7d7185..ed8a5c53467e 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -2160,6 +2160,7 @@ static void macb_configure_dma(struct macb *bp)
 		else
 			dmacfg &= ~GEM_BIT(TXCOEN);
 
+		dmacfg &= ~GEM_BIT(ADDR64);
 #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
 		if (bp->hw_dma_cap & HW_DMA_CAP_64B)
 			dmacfg |= GEM_BIT(ADDR64);
-- 
1.9.1