netdev - [PATCH 3/3] sky2: turn of dynamic Tx watermark workaround (FE+ only)

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Message-ID: <20071127110207.0d65e820@freepuppy.rosehill>
Date:	Tue, 27 Nov 2007 11:02:07 -0800
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	Jeff Garzik <jgarzik@...ox.com>
Cc:	netdev@...r.kernel.org, Tim Gardner <tim.gardner@...onical.com>
Subject: [PATCH 3/3] sky2: turn of dynamic Tx watermark workaround (FE+
 only)

Add workaround for issues FE+ (A0) transmit watermark.
This is copied verbatim from vendor driver sk98lin (10.22.4.3).
Don't have that chip version and no more information seems to be available.

Signed-off-by: Stephen Hemminger <shemminger@...ux-foundation.org>

--- a/drivers/net/sky2.c	2007-11-26 14:02:36.000000000 -0800
+++ b/drivers/net/sky2.c	2007-11-26 14:28:47.000000000 -0800
@@ -845,6 +845,13 @@ static void sky2_mac_init(struct sky2_hw
 		sky2_set_tx_stfwd(hw, port);
 	}
 
+	if (hw->chip_id == CHIP_ID_YUKON_FE_P &&
+	    hw->chip_rev == CHIP_REV_YU_FE2_A0) {
+		/* disable dynamic watermark */
+		reg = sky2_read16(hw, SK_REG(port, TX_GMF_EA));
+		reg &= ~TX_DYN_WM_ENA;
+		sky2_write16(hw, SK_REG(port, TX_GMF_EA), reg);
+	}
 }
 
 /* Assign Ram Buffer allocation to queue */
-
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