linux-kernel - [PATCH PROPOSAL] libata/pci: Move D3 hack handling from libata into PCI

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Date:	Thu, 24 Jul 2008 17:18:38 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	jeff@...zik.org, greg@...ah.com, linux-kernel@...r.kernel.org
Subject: [PATCH PROPOSAL] libata/pci: Move D3 hack handling from libata into
 PCI

Libata has some hacks to deal with certain controllers going silly in D3
state. The right way to handle this is to keep a PCI device flag for such
devices. That can then be generalised for no ATA devices with power
problems.

Signed-off-by: Alan Cox <alan@...hat.com>

diff --git a/drivers/ata/pata_acpi.c b/drivers/ata/pata_acpi.c
index fbe6057..c5f91e6 100644
--- a/drivers/ata/pata_acpi.c
+++ b/drivers/ata/pata_acpi.c
@@ -259,12 +259,6 @@ static int pacpi_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
 		.port_ops	= &pacpi_ops,
 	};
 	const struct ata_port_info *ppi[] = { &info, NULL };
-	if (pdev->vendor == PCI_VENDOR_ID_ATI) {
-		int rc = pcim_enable_device(pdev);
-		if (rc < 0)
-			return rc;
-		pcim_pin_device(pdev);
-	}
 	return ata_pci_sff_init_one(pdev, ppi, &pacpi_sht, NULL);
 }
 
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index d00f0e0..1f70a9e 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -572,6 +572,10 @@ int pci_set_power_state(struct pci_dev *dev, pci_power_t state)
 		if (!ret)
 			pci_update_current_state(dev);
 	}
+	/* This device is quirked not to be put into D3, so
+	   don't put it in D3 */
+	if (state == PCI_D3hot && (dev->dev_flags & PCI_DEV_FLAGS_NO_D3))
+		return 0;
 
 	error = pci_raw_set_power_state(dev, state);
 
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 12d4893..11cc96d 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -908,7 +908,7 @@ DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_CSB
 /*
  *	Intel 82801CAM ICH3-M datasheet says IDE modes must be the same
  */
-static void __init quirk_ide_samemode(struct pci_dev *pdev)
+static void __devinit quirk_ide_samemode(struct pci_dev *pdev)
 {
 	u8 prog;
 
@@ -923,6 +923,19 @@ static void __init quirk_ide_samemode(struct pci_dev *pdev)
 }
 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_10, quirk_ide_samemode);
 
+/*
+ * Some ATA devices break if put into D3
+ */
+
+static void __devinit quirk_no_ata_d3(struct pci_dev *pdev)
+{
+	/* Quirk the legacy ATA devices only. The AHCI ones are ok */
+	if ((pdev->class >> 8) == PCI_CLASS_STORAGE_IDE)
+		pdev->dev_flags |= PCI_DEV_FLAGS_NO_D3;
+}
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SERVERWORKS, PCI_ANY_ID, quirk_no_ata_d3);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_ATI, PCI_ANY_ID, quirk_no_ata_d3);
+
 /* This was originally an Alpha specific thing, but it really fits here.
  * The i82375 PCI/EISA bridge appears as non-classified. Fix that.
  */
diff --git a/include/linux/pci.h b/include/linux/pci.h
index a6a088e..02ebeb5 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -124,6 +124,8 @@ enum pci_dev_flags {
 	 * generation too.
 	 */
 	PCI_DEV_FLAGS_MSI_INTX_DISABLE_BUG = (__force pci_dev_flags_t) 1,
+	/* Device configuration is irrevocably lost if disabled into D3 */
+	PCI_DEV_FLAGS_NO_D3 = (__force pci_dev_flags_t) 2,
 };
 
 typedef unsigned short __bitwise pci_bus_flags_t;
--
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