linux-kernel - [PATCH 4.1 22/29] net: dsa: bcm_sf2: Do not override speed settings

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Message-Id: <20151001093146.685631106@linuxfoundation.org>
Date:	Thu,  1 Oct 2015 11:31:58 +0200
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Florian Fainelli <f.fainelli@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.1 22/29] net: dsa: bcm_sf2: Do not override speed settings

4.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Florian Fainelli <f.fainelli@...il.com>

[ Upstream d2eac98f7d1b950b762a7eca05a9ce0ea1d878d2 in net-next tree,
  will be pushed to Linus very soon. ]

The SF2 driver currently overrides speed settings for its port
configured using a fixed PHY, this is both unnecessary and incorrect,
because we keep feedback to the hardware parameters that we read from
the PHY device, which in the case of a fixed PHY cannot possibly change
speed.

This is a required change to allow the fixed PHY code to allow
registering a PHY with a link configured as DOWN by default and avoid
some sort of circular dependency where we require the link_update
callback to run to program the hardware, and we then utilize the fixed
PHY parameters to program the hardware with the same settings.

Fixes: 246d7f773c13 ("net: dsa: add Broadcom SF2 switch driver")
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/dsa/bcm_sf2.c |   18 +-----------------
 1 file changed, 1 insertion(+), 17 deletions(-)

--- a/drivers/net/dsa/bcm_sf2.c
+++ b/drivers/net/dsa/bcm_sf2.c
@@ -893,15 +893,11 @@ static void bcm_sf2_sw_fixed_link_update
 					 struct fixed_phy_status *status)
 {
 	struct bcm_sf2_priv *priv = ds_to_priv(ds);
-	u32 duplex, pause, speed;
+	u32 duplex, pause;
 	u32 reg;
 
 	duplex = core_readl(priv, CORE_DUPSTS);
 	pause = core_readl(priv, CORE_PAUSESTS);
-	speed = core_readl(priv, CORE_SPDSTS);
-
-	speed >>= (port * SPDSTS_SHIFT);
-	speed &= SPDSTS_MASK;
 
 	status->link = 0;
 
@@ -929,18 +925,6 @@ static void bcm_sf2_sw_fixed_link_update
 		reg &= ~LINK_STS;
 	core_writel(priv, reg, CORE_STS_OVERRIDE_GMIIP_PORT(port));
 
-	switch (speed) {
-	case SPDSTS_10:
-		status->speed = SPEED_10;
-		break;
-	case SPDSTS_100:
-		status->speed = SPEED_100;
-		break;
-	case SPDSTS_1000:
-		status->speed = SPEED_1000;
-		break;
-	}
-
 	if ((pause & (1 << port)) &&
 	    (pause & (1 << (port + PAUSESTS_TX_PAUSE_SHIFT)))) {
 		status->asym_pause = 1;


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