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netdev: bfin_mac: document TE setting in RMII modes

Message ID 1301296649-25603-1-git-send-email-vapier@gentoo.org
State Superseded, archived
Delegated to: David Miller
Headers show

Commit Message

Mike Frysinger March 28, 2011, 7:17 a.m. UTC 
The current code sometimes generates build warnings due to how it checks
the silicon revision, so clean it up and properly document things.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
---
 drivers/net/bfin_mac.c |   13 ++++++++++---
 1 files changed, 10 insertions(+), 3 deletions(-)
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Patch

diff --git a/drivers/net/bfin_mac.c b/drivers/net/bfin_mac.c
index 22abfb3..0c68816 100644
--- a/drivers/net/bfin_mac.c
+++ b/drivers/net/bfin_mac.c
@@ -1237,9 +1237,16 @@  static int bfin_mac_enable(struct phy_device *phydev)
 
 	if (phydev->interface == PHY_INTERFACE_MODE_RMII) {
 		opmode |= RMII; /* For Now only 100MBit are supported */
-#if (defined(CONFIG_BF537) || defined(CONFIG_BF536)) && CONFIG_BF_REV_0_2
-		opmode |= TE;
-#endif
+		if (__SILICON_REVISION__ < 3) {
+			/*
+			 * This isn't publicly documented (fun times!), but in
+			 * silicon <=0.2, the RX and TX pins are clocked together.
+			 * So in order to recv, we must enable the transmit side
+			 * as well.  This will cause a spurious TX interrupt too,
+			 * but we can easily consume that.
+			 */
+			opmode |= TE;
+		}
 	}
 
 	/* Turn on the EMAC rx */