Patch "net: ethernet: ti: cpsw: add check for in-band mode setting with RGMII PHY interface" has been added to the 3.18-stable tree

This is a note to let you know that I've just added the patch titled

net: ethernet: ti: cpsw: add check for in-band mode setting with RGMII PHY interface

to the 3.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
net-ethernet-ti-cpsw-add-check-for-in-band-mode-setting-with-rgmii-phy-interface.patch
and it can be found in the queue-3.18 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: "SZ Lin (林上智)" <[email protected]>
Date: Fri, 16 Mar 2018 00:56:01 +0800
Subject: net: ethernet: ti: cpsw: add check for in-band mode setting with RGMII PHY interface

From: "SZ Lin (林上智)" <[email protected]>

[ Upstream commit f9db50691db4a7d860fce985f080bb3fc23a7ede ]

According to AM335x TRM[1] 14.3.6.2, AM437x TRM[2] 15.3.6.2 and DRA7 TRM[3] 24.11.4.8.7.3.3, in-band mode in EXT_EN(bit18) register is only available when PHY is configured in RGMII mode with 10Mbps speed. It will cause some networking issues without RGMII mode, such as carrier sense errors and low throughput. TI also mentioned this issue in their forum[4].

This patch adds the check mechanism for PHY interface with RGMII interface type, the in-band mode can only be set in RGMII mode with 10Mbps speed.

References:
[1]: https://www.ti.com/lit/ug/spruh73p/spruh73p.pdf
[2]: http://www.ti.com/lit/ug/spruhl7h/spruhl7h.pdf
[3]: http://www.ti.com/lit/ug/spruic2b/spruic2b.pdf
[4]: https://e2e.ti.com/support/arm/sitara_arm/f/791/p/640765/2392155

---
 drivers/net/ethernet/ti/cpsw.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

@@ -872,7 +872,8 @@ static void _cpsw_adjust_link(struct cps
 		/* set speed_in input in case RMII mode is used in 100Mbps */
 		if (phy->speed == 100)
 			mac_control |= BIT(15);
-		else if (phy->speed == 10)
+		/* in band mode only works in 10Mbps RGMII mode */
+		else if ((phy->speed == 10) && phy_interface_is_rgmii(phy))
 			mac_control |= BIT(18); /* In Band mode */
 
 		if (priv->rx_pause)

Patches currently in stable-queue which might be from [email protected] are

queue-3.18/net-ethernet-ti-cpsw-add-check-for-in-band-mode-setting-with-rgmii-phy-interface.patch