LKML Archive on
help / color / mirror / Atom feed
* FW: [SMC911x ]fix for driver resume
@ 2008-11-07 15:42 Dasgupta, Romit
  0 siblings, 0 replies; only message in thread
From: Dasgupta, Romit @ 2008-11-07 15:42 UTC (permalink / raw)
  To: linux-kernel

     I did not get any reply from anyone yet. Is there any MAINTAINER who can verify the patch below?


-----Original Message-----
From: Dasgupta, Romit 
Sent: Thursday, November 06, 2008 3:46 PM
To: ''; ''; ''
Cc: '';
Subject: [SMC911x ]fix for driver resume and compilation warning 

     I am trying out suspend, resume on an OMAP3 based board. What I see during resume is that the SMC911x driver resume routing gets stuck after trying to transmit the packet out of the controller. Some debug messages below:

--> smc911x_drv_resume
eth0: --> smc911x_reset
eth0: smc911x_reset timeout waiting for PM restore
eth0: --> smc911x_enable
eth0: --> smc911x_phy_configure()
eth0: --> smc911x_phy_reset()
eth0: phy caps=0x782d
eth0: phy advertised caps=0x0de1
eth0: --> smc911x_phy_check_media
smc911x_phy_read: phyaddr=0x1, phyreg=0x01, phydata=0x7809
smc911x_phy_read: phyaddr=0x1, phyreg=0x01, phydata=0x7809
eth0: link down
Restarting tasks ... eth0: --> smc911x_hard_start_xmit
eth0: --> smc911x_hardware_send_pkt
eth0: --> smc911x_hard_start_xmit
eth0: --> smc911x_hardware_send_pkt
eth0: --> smc911x_hard_start_xmit
eth0: --> smc911x_hardware_send_pkt
nfs: server not responding, still trying
nfs: server not responding, still trying

The following change makes it work fine: (The change within smc911x_drv_probe function was to get rid of a compilation warning).
Additionally, the SMC9211 data sheet says that when we enter D2 sleep state, we need to set the EDPWRDOWN bit in the PHY Mode control/status register and clear it when we are back to D0. This is not done in the code as far as I can see. So does it mean that the PHY is not powered down but the controller is? I have another patch that fixes it. I will send that as well unless I am missing something.


Signed-off-by: Romit Dasgupta <>

diff --git a/drivers/net/smc911x.c b/drivers/net/smc911x.c
index 5051554..1f26ab0 100644
--- a/drivers/net/smc911x.c
+++ b/drivers/net/smc911x.c
@@ -2050,7 +2050,9 @@ err_out:
 static int smc911x_drv_probe(struct platform_device *pdev)
 	struct smc911x_platdata *pd = pdev->dev.platform_data;
 	struct net_device *ndev;
 	struct resource *res;
 	struct smc911x_local *lp;
@@ -2182,9 +2184,9 @@ static int smc911x_drv_resume(struct platform_device *dev)
 		if (netif_running(ndev)) {
-			smc911x_enable(ndev);
 			if (lp->phy_type != 0)
+			smc911x_enable(ndev);

^ permalink raw reply	[flat|nested] only message in thread

only message in thread, other threads:[~2008-11-07 15:43 UTC | newest]

Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2008-11-07 15:42 FW: [SMC911x ]fix for driver resume Dasgupta, Romit

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).