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Subject[PATCH] pata_sl82c105: add Power Management support
Date
From: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Subject: [PATCH] pata_sl82c105: add Power Management support

Fixes IDE -> libata regression.

There shouldn't be any problems with it as corresponding IDE's host
driver (sl82c105) has been supporting PCI Power Management since
Oct 10 2008 (commit feb22b7f "ide: add proper PCI PM support (v2)")
and IDE PM since Jun 14 2003 (patch v2.5.73 "ide: Power Management").

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
---
earlier references:
https://lkml.org/lkml/2009/11/25/385
drivers/ata/pata_sl82c105.c | 37 ++++++++++++++++++++++++++++++++-----
1 file changed, 32 insertions(+), 5 deletions(-)
Index: b/drivers/ata/pata_sl82c105.c
===================================================================
--- a/drivers/ata/pata_sl82c105.c
+++ b/drivers/ata/pata_sl82c105.c
@@ -1,6 +1,7 @@
/*
* pata_sl82c105.c - SL82C105 PATA for new ATA layer
* (C) 2005 Red Hat Inc
+ * (C) 2011 Bartlomiej Zolnierkiewicz
*
* Based in part on linux/drivers/ide/pci/sl82c105.c
* SL82C105/Winbond 553 IDE driver
@@ -278,6 +279,14 @@ static int sl82c105_bridge_revision(stru
return bridge->revision;
}

+static void sl82c105_fixup(struct pci_dev *pdev)
+{
+ u32 val;
+
+ pci_read_config_dword(pdev, 0x40, &val);
+ val |= CTRL_P0EN | CTRL_P0F16 | CTRL_P1F16;
+ pci_write_config_dword(pdev, 0x40, val);
+}

static int sl82c105_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
@@ -295,7 +304,6 @@ static int sl82c105_init_one(struct pci_
/* for now use only the first port */
const struct ata_port_info *ppi[] = { &info_early,
NULL };
- u32 val;
int rev;
int rc;

@@ -312,13 +320,28 @@ static int sl82c105_init_one(struct pci_
else
ppi[0] = &info_dma;

- pci_read_config_dword(dev, 0x40, &val);
- val |= CTRL_P0EN | CTRL_P0F16 | CTRL_P1F16;
- pci_write_config_dword(dev, 0x40, val);
+ sl82c105_fixup(dev);

return ata_pci_bmdma_init_one(dev, ppi, &sl82c105_sht, NULL, 0);
}

+#ifdef CONFIG_PM
+static int sl82c105_reinit_one(struct pci_dev *pdev)
+{
+ struct ata_host *host = dev_get_drvdata(&pdev->dev);
+ int rc;
+
+ rc = ata_pci_device_do_resume(pdev);
+ if (rc)
+ return rc;
+
+ sl82c105_fixup(pdev);
+
+ ata_host_resume(host);
+ return 0;
+}
+#endif
+
static const struct pci_device_id sl82c105[] = {
{ PCI_VDEVICE(WINBOND, PCI_DEVICE_ID_WINBOND_82C105), },

@@ -329,7 +352,11 @@ static struct pci_driver sl82c105_pci_dr
.name = DRV_NAME,
.id_table = sl82c105,
.probe = sl82c105_init_one,
- .remove = ata_pci_remove_one
+ .remove = ata_pci_remove_one,
+#ifdef CONFIG_PM
+ .suspend = ata_pci_device_suspend,
+ .resume = sl82c105_reinit_one,
+#endif
};

static int __init sl82c105_init(void)

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