Re: [RFC][PATCH] uli526x: Add suspend and resume routines (updated)

[Rafael J. Wysocki]

On Tuesday, 14 August 2007 07:58, Jeff Garzik wrote:
> Rafael J. Wysocki wrote:
> > On Wednesday, 8 August 2007 00:26, Jeff Garzik wrote:
> >> Rafael J. Wysocki wrote:
> >>> On Tuesday, 7 August 2007 23:40, Jeff Garzik wrote:
> >>>> I'll let our new tulip maintainer see what he thinks about the 
> >>>> implementation.  Seems fairly sane to me, but should at least get an "it 
> >>>> works" test.
> >>> It has been tested, as stated in the changelog, and works (on my test system).
[--snip--]
 
> Two comments:
> 
> 1) Like akpm, the CONFIG_PM_SLEEP is out of place.  All other drivers 
> use CONFIG_PM

OK

> 2) just remove the !dev checks, that is an impossible condition

OK

Updated patch follows.

---
From: Rafael J. Wysocki <rjw@xxxxxxx>

Add suspend/resume support to the uli526x network driver (tested on x86_64,
with 'Ethernet controller: ALi Corporation M5263 Ethernet Controller, rev 40').

This patch is based on the suspend/resume code in the tg3 driver.

Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx>
---
 drivers/net/tulip/uli526x.c |  108 +++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 102 insertions(+), 6 deletions(-)

Index: linux-2.6.23-rc3/drivers/net/tulip/uli526x.c
===================================================================
--- linux-2.6.23-rc3.orig/drivers/net/tulip/uli526x.c
+++ linux-2.6.23-rc3/drivers/net/tulip/uli526x.c
@@ -1110,19 +1110,15 @@ static void uli526x_timer(unsigned long 
 
 
 /*
- *	Dynamic reset the ULI526X board
  *	Stop ULI526X board
  *	Free Tx/Rx allocated memory
- *	Reset ULI526X board
- *	Re-initialize ULI526X board
+ *	Init system variable
  */
 
-static void uli526x_dynamic_reset(struct net_device *dev)
+static void uli526x_reset_prepare(struct net_device *dev)
 {
 	struct uli526x_board_info *db = netdev_priv(dev);
 
-	ULI526X_DBUG(0, "uli526x_dynamic_reset()", 0);
-
 	/* Sopt MAC controller */
 	db->cr6_data &= ~(CR6_RXSC | CR6_TXSC);	/* Disable Tx/Rx */
 	update_cr6(db->cr6_data, dev->base_addr);
@@ -1141,6 +1137,22 @@ static void uli526x_dynamic_reset(struct
 	db->link_failed = 1;
 	db->init=1;
 	db->wait_reset = 0;
+}
+
+
+/*
+ *	Dynamic reset the ULI526X board
+ *	Stop ULI526X board
+ *	Free Tx/Rx allocated memory
+ *	Reset ULI526X board
+ *	Re-initialize ULI526X board
+ */
+
+static void uli526x_dynamic_reset(struct net_device *dev)
+{
+	ULI526X_DBUG(0, "uli526x_dynamic_reset()", 0);
+
+	uli526x_reset_prepare(dev);
 
 	/* Re-initialize ULI526X board */
 	uli526x_init(dev);
@@ -1150,6 +1162,88 @@ static void uli526x_dynamic_reset(struct
 }
 
 
+#ifdef CONFIG_PM
+
+/*
+ *	Suspend the interface.
+ */
+
+static int uli526x_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+	struct net_device *dev = pci_get_drvdata(pdev);
+	pci_power_t power_state;
+	int err;
+
+	ULI526X_DBUG(0, "uli526x_suspend", 0);
+
+	if (!netdev_priv(dev))
+		return 0;
+
+	pci_save_state(pdev);
+
+	if (!netif_running(dev))
+		return 0;
+
+	netif_device_detach(dev);
+	uli526x_reset_prepare(dev);
+
+	power_state = pci_choose_state(pdev, state);
+	pci_enable_wake(pdev, power_state, 0);
+	err = pci_set_power_state(pdev, power_state);
+	if (err) {
+		netif_device_attach(dev);
+		/* Re-initialize ULI526X board */
+		uli526x_init(dev);
+		/* Restart upper layer interface */
+		netif_wake_queue(dev);
+	}
+
+	return err;
+}
+
+/*
+ *	Resume the interface.
+ */
+
+static int uli526x_resume(struct pci_dev *pdev)
+{
+	struct net_device *dev = pci_get_drvdata(pdev);
+	int err;
+
+	ULI526X_DBUG(0, "uli526x_resume", 0);
+
+	if (!netdev_priv(dev))
+		return 0;
+
+	pci_restore_state(pdev);
+
+	if (!netif_running(dev))
+		return 0;
+
+	err = pci_set_power_state(pdev, PCI_D0);
+	if (err) {
+		printk(KERN_WARNING "%s: Could not put device into D0\n",
+			dev->name);
+		return err;
+	}
+
+	netif_device_attach(dev);
+	/* Re-initialize ULI526X board */
+	uli526x_init(dev);
+	/* Restart upper layer interface */
+	netif_wake_queue(dev);
+
+	return 0;
+}
+
+#else /* !CONFIG_PM */
+
+#define uli526x_suspend	NULL
+#define uli526x_resume	NULL
+
+#endif /* !CONFIG_PM */
+
+
 /*
  *	free all allocated rx buffer
  */
@@ -1689,6 +1783,8 @@ static struct pci_driver uli526x_driver 
 	.id_table	= uli526x_pci_tbl,
 	.probe		= uli526x_init_one,
 	.remove		= __devexit_p(uli526x_remove_one),
+	.suspend	= uli526x_suspend,
+	.resume		= uli526x_resume,
 };
 
 MODULE_AUTHOR("Peer Chen, peer.chen@xxxxxxxxxx");
-
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