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From: Marek Vasut <marex@denx.de>
To: netdev@vger.kernel.org
Cc: Marek Vasut <marex@denx.de>,
	"David S . Miller" <davem@davemloft.net>,
	Lukas Wunner <lukas@wunner.de>, Petr Stetiar <ynezz@true.cz>,
	YueHaibing <yuehaibing@huawei.com>
Subject: [PATCH 3/3] net: ks8851-ml: Fix 16-bit IO operation
Date: Mon, 10 Feb 2020 19:41:39 +0100
Message-ID: <20200210184139.342716-3-marex@denx.de> (raw)
In-Reply-To: <20200210184139.342716-1-marex@denx.de>

The Micrel KSZ8851-16MLLI datasheet DS00002357B page 12 states that
BE[3:0] signals are active high. This contradicts the measurements
of the behavior of the actual chip, where these signals behave as
active low. For example, to read the CIDER register, the bus must
expose 0xc0c0 during the address phase, which means BE[3:0]=4'b1100.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: David S. Miller <davem@davemloft.net>
Cc: Lukas Wunner <lukas@wunner.de>
Cc: Petr Stetiar <ynezz@true.cz>
Cc: YueHaibing <yuehaibing@huawei.com>
---
 drivers/net/ethernet/micrel/ks8851_mll.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/micrel/ks8851_mll.c b/drivers/net/ethernet/micrel/ks8851_mll.c
index e9ca198a67a4..0729b95d555c 100644
--- a/drivers/net/ethernet/micrel/ks8851_mll.c
+++ b/drivers/net/ethernet/micrel/ks8851_mll.c
@@ -166,7 +166,7 @@ static int msg_enable;
 
 static u16 ks_rdreg16(struct ks_net *ks, int offset)
 {
-	ks->cmd_reg_cache = (u16)offset | ((BE1 | BE0) << (offset & 0x02));
+	ks->cmd_reg_cache = (u16)offset | ((BE3 | BE2) >> (offset & 0x02));
 	iowrite16(ks->cmd_reg_cache, ks->hw_addr_cmd);
 	return ioread16(ks->hw_addr);
 }
@@ -181,7 +181,7 @@ static u16 ks_rdreg16(struct ks_net *ks, int offset)
 
 static void ks_wrreg16(struct ks_net *ks, int offset, u16 value)
 {
-	ks->cmd_reg_cache = (u16)offset | ((BE1 | BE0) << (offset & 0x02));
+	ks->cmd_reg_cache = (u16)offset | ((BE3 | BE2) >> (offset & 0x02));
 	iowrite16(ks->cmd_reg_cache, ks->hw_addr_cmd);
 	iowrite16(value, ks->hw_addr);
 }
-- 
2.24.1


  parent reply index

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-10 18:41 [PATCH 1/3] net: ks8851-ml: Remove 8-bit bus accessors Marek Vasut
2020-02-10 18:41 ` [PATCH 2/3] net: ks8851-ml: Fix 16-bit data access Marek Vasut
2020-02-10 19:35   ` Lukas Wunner
2020-02-10 19:40     ` Marek Vasut
2020-02-15  9:24   ` David Miller
2020-02-15  9:47     ` Marek Vasut
2020-02-15  9:56       ` David Miller
2020-02-10 18:41 ` Marek Vasut [this message]
2020-02-10 19:31 ` [PATCH 1/3] net: ks8851-ml: Remove 8-bit bus accessors Lukas Wunner
2020-02-10 19:44   ` Marek Vasut

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