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From:   Hongwei Zhang <hongweiz@ami.com>
To:     <linux-aspeed@lists.ozlabs.org>, <linux-kernel@vger.kernel.org>,
        <openbmc@lists.ozlabs.org>, Jakub Kicinski <kuba@kernel.org>,
        David S Miller <davem@davemloft.net>
CC:     Hongwei Zhang <hongweiz@ami.com>, netdev <netdev@vger.kernel.org>,
        Joel Stanley <joel@jms.id.au>, Andrew Jeffery <andrew@aj.id.au>
Subject: [Aspeed,ncsi-rx, v2 1/1] net: ftgmac100: Fix AST2600 EVB NCSI RX issue
Date:   Mon, 21 Dec 2020 14:40:26 -0500
Message-ID: <20201221194026.30715-2-hongweiz@ami.com>
In-Reply-To: <20201215192323.24359-1-hongweiz@ami.com>
References: <20201215192323.24359-1-hongweiz@ami.com>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

When FTGMAC100 driver is used on other NCSI Ethernet controllers, few
controllers have compatible issue, removing FTGMAC100_RXDES0_RX_ERR bit
from RXDES0_ANY_ERROR can fix the issue.

Fixes: 7ee2d5b4d4340353 ("ARM: dts: nuvoton: Add Fii Kudo system")
Signed-off-by: Hongwei Zhang <hongweiz@ami.com>
---
 drivers/net/ethernet/faraday/Kconfig     | 9 +++++++++
 drivers/net/ethernet/faraday/ftgmac100.h | 8 ++++++++
 2 files changed, 17 insertions(+)

diff --git a/drivers/net/ethernet/faraday/Kconfig b/drivers/net/ethernet/faraday/Kconfig
index c2677ec0564d..ccd0c30be0db 100644
--- a/drivers/net/ethernet/faraday/Kconfig
+++ b/drivers/net/ethernet/faraday/Kconfig
@@ -38,4 +38,13 @@ config FTGMAC100
 	  from Faraday. It is used on Faraday A369, Andes AG102 and some
 	  other ARM/NDS32 SoC's.
 
+config FTGMAC100_RXDES0_RX_ERR_CHK
+	bool "Include FTGMAC100_RXDES0_RX_ERR in RXDES0_ANY_ERROR"
+	default y
+	depends on FTGMAC100
+	help
+	  Say N here if the NCSI controller on your platform has compatible
+	  issue with FTGMAC100, thus always trigger RXDES0_RX_ERR. Exclude
+	  this bit can fix the issue.
+
 endif # NET_VENDOR_FARADAY
diff --git a/drivers/net/ethernet/faraday/ftgmac100.h b/drivers/net/ethernet/faraday/ftgmac100.h
index 63b3e02fab16..59e1bd52d261 100644
--- a/drivers/net/ethernet/faraday/ftgmac100.h
+++ b/drivers/net/ethernet/faraday/ftgmac100.h
@@ -251,12 +251,20 @@ struct ftgmac100_rxdes {
 #define FTGMAC100_RXDES0_RXPKT_RDY	(1 << 31)
 
 /* Errors we care about for dropping packets */
+#ifdef CONFIG_FTGMAC100_RXDES0_RX_ERR_CHK
 #define RXDES0_ANY_ERROR		( \
 	FTGMAC100_RXDES0_RX_ERR		| \
 	FTGMAC100_RXDES0_CRC_ERR	| \
 	FTGMAC100_RXDES0_FTL		| \
 	FTGMAC100_RXDES0_RUNT		| \
 	FTGMAC100_RXDES0_RX_ODD_NB)
+#else
+#define RXDES0_ANY_ERROR		( \
+	FTGMAC100_RXDES0_CRC_ERR	| \
+	FTGMAC100_RXDES0_FTL		| \
+	FTGMAC100_RXDES0_RUNT		| \
+	FTGMAC100_RXDES0_RX_ODD_NB)
+#endif
 
 #define FTGMAC100_RXDES1_VLANTAG_CI	0xffff
 #define FTGMAC100_RXDES1_PROT_MASK	(0x3 << 20)
-- 
2.17.1