netdev - RE: [PATCH net-next v2] igb: reset PHY after recovering from PHY power down

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Date:	Tue, 20 Dec 2011 16:05:53 +0000
From:	"Wyborny, Carolyn" <carolyn.wyborny@...el.com>
To:	Koki Sanagi <sanagi.koki@...fujitsu.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:	"davem@...emloft.net" <davem@...emloft.net>,
	"e1000-devel@...ts.sourceforge.net" 
	<e1000-devel@...ts.sourceforge.net>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
	"Allan, Bruce W" <bruce.w.allan@...el.com>,
	"Skidmore, Donald C" <donald.c.skidmore@...el.com>,
	"Rose, Gregory V" <gregory.v.rose@...el.com>,
	"Waskiewicz Jr, Peter P" <peter.p.waskiewicz.jr@...el.com>,
	"Duyck, Alexander H" <alexander.h.duyck@...el.com>,
	"Ronciak, John" <john.ronciak@...el.com>
Subject: RE: [PATCH net-next v2] igb: reset PHY after recovering from PHY
 power down



>-----Original Message-----
>From: Koki Sanagi [mailto:sanagi.koki@...fujitsu.com]
>Sent: Sunday, December 18, 2011 5:24 PM
>To: netdev@...r.kernel.org
>Cc: davem@...emloft.net; e1000-devel@...ts.sourceforge.net; Wyborny,
>Carolyn; Kirsher, Jeffrey T; Brandeburg, Jesse; Allan, Bruce W;
>Skidmore, Donald C; Rose, Gregory V; Waskiewicz Jr, Peter P; Duyck,
>Alexander H; Ronciak, John
>Subject: [PATCH net-next v2] igb: reset PHY after recovering from PHY
>power down
>
>According to 82576_Datasheet.pdf, PHY setting is lost after PHY power
>down.
>So resetting PHY is needed when recovering from PHY power down to set a
>default
>setting to PHY register.
>Owing to this lack, NIC doesn't link up in some rare situation.
>
>Signed-off-by: Koki Sanagi <sanagi.koki@...fujitsu.com>
>---
>diff --git a/drivers/net/ethernet/intel/igb/igb_main.c
>b/drivers/net/ethernet/intel/igb/igb_main.c
>index 89d576c..9b923b0 100644
>--- a/drivers/net/ethernet/intel/igb/igb_main.c
>+++ b/drivers/net/ethernet/intel/igb/igb_main.c
>@@ -1498,6 +1498,7 @@ void igb_power_up_link(struct igb_adapter
>*adapter)
> 		igb_power_up_phy_copper(&adapter->hw);
> 	else
> 		igb_power_up_serdes_link_82575(&adapter->hw);
>+	igb_reset_phy(&adapter->hw);
> }
>
> /**

ACK


Carolyn Wyborny
Linux Development
LAN Access Division
Intel Corporation


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