linux-kernel - [PATCH 3/4] arcnet: com20020: Fixup missing SLOWARB bit

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Message-Id: <20180517130713.2839-1-andrea.greco.gapmilano@gmail.com>
Date:   Thu, 17 May 2018 15:07:13 +0200
From:   Andrea Greco <andrea.greco.gapmilano@...il.com>
To:     tobin@...orbit.com
Cc:     andrea.greco.gapmilano@...il.com, Andrea Greco <a.greco@...gma.it>,
        Michael Grzeschik <m.grzeschik@...gutronix.de>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/4] arcnet: com20020: Fixup missing SLOWARB bit

From: Andrea Greco <a.greco@...gma.it>

If com20020 clock is major of 40Mhz SLOWARB bit is requested.

Signed-off-by: Andrea Greco <a.greco@...gma.it>
---
 drivers/net/arcnet/com20020.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/arcnet/com20020.c b/drivers/net/arcnet/com20020.c
index 2fd00d2dd6bf..f1de02f05305 100644
--- a/drivers/net/arcnet/com20020.c
+++ b/drivers/net/arcnet/com20020.c
@@ -102,6 +102,10 @@ int com20020_check(struct net_device *dev)
 	lp->setup = lp->clockm ? 0 : (lp->clockp << 1);
 	lp->setup2 = (lp->clockm << 4) | 8;
 
+	/* If clock is major of 40Mhz, SLOWARB bit must be set */
+	if (lp->clockm > 1)
+		lp->setup2 |= SLOWARB;
+
 	/* CHECK: should we do this for SOHARD cards ? */
 	/* Enable P1Mode for backplane mode */
 	lp->setup = lp->setup | P1MODE;
-- 
2.14.3