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authorAlan <alan@lxorguk.ukuu.org.uk>2006-11-22 17:23:37 +0000
committerJeff Garzik <jeff@garzik.org>2006-12-01 22:46:46 -0500
commitad4a42d287546888349ad24d351673a59f429ee8 (patch)
treee8a5ae897be2ed04e095b566547ddda47b0ec605 /drivers/ata/pata_rz1000.c
parent34d8dfb1e6b51dbd6eefcb449b531c7ee773664c (diff)
downloadblackbird-op-linux-ad4a42d287546888349ad24d351673a59f429ee8.tar.gz
blackbird-op-linux-ad4a42d287546888349ad24d351673a59f429ee8.zip
[PATCH] pata_rz1000: Force readahead off on resume
The RZ1000 is a generic device except that it has a readahead fifo flaw that corrupts. We force this off at init time but we want to be paranoid and force it off at resume as well. I don't know of any actual hardware that supports both RZ1000 and suspend to RAM but given its a disk muncher better safe than sorry. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers/ata/pata_rz1000.c')
-rw-r--r--drivers/ata/pata_rz1000.c48
1 files changed, 33 insertions, 15 deletions
diff --git a/drivers/ata/pata_rz1000.c b/drivers/ata/pata_rz1000.c
index e4e5ea423fef..21567aba82d2 100644
--- a/drivers/ata/pata_rz1000.c
+++ b/drivers/ata/pata_rz1000.c
@@ -21,7 +21,7 @@
#include <linux/libata.h>
#define DRV_NAME "pata_rz1000"
-#define DRV_VERSION "0.2.2"
+#define DRV_VERSION "0.2.3"
/**
@@ -92,6 +92,8 @@ static struct scsi_host_template rz1000_sht = {
.slave_configure = ata_scsi_slave_config,
.slave_destroy = ata_scsi_slave_destroy,
.bios_param = ata_std_bios_param,
+ .resume = ata_scsi_device_resume,
+ .suspend = ata_scsi_device_suspend,
};
static struct ata_port_operations rz1000_port_ops = {
@@ -129,6 +131,19 @@ static struct ata_port_operations rz1000_port_ops = {
.host_stop = ata_host_stop
};
+static int rz1000_fifo_disable(struct pci_dev *pdev)
+{
+ u16 reg;
+ /* Be exceptionally paranoid as we must be sure to apply the fix */
+ if (pci_read_config_word(pdev, 0x40, &reg) != 0)
+ return -1;
+ reg &= 0xDFFF;
+ if (pci_write_config_word(pdev, 0x40, reg) != 0)
+ return -1;
+ printk(KERN_INFO DRV_NAME ": disabled chipset readahead.\n");
+ return 0;
+}
+
/**
* rz1000_init_one - Register RZ1000 ATA PCI device with kernel services
* @pdev: PCI device to register
@@ -143,7 +158,6 @@ static int rz1000_init_one (struct pci_dev *pdev, const struct pci_device_id *en
{
static int printed_version;
struct ata_port_info *port_info[2];
- u16 reg;
static struct ata_port_info info = {
.sht = &rz1000_sht,
.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
@@ -154,23 +168,25 @@ static int rz1000_init_one (struct pci_dev *pdev, const struct pci_device_id *en
if (!printed_version++)
printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");
- /* Be exceptionally paranoid as we must be sure to apply the fix */
- if (pci_read_config_word(pdev, 0x40, &reg) != 0)
- goto fail;
- reg &= 0xDFFF;
- if (pci_write_config_word(pdev, 0x40, reg) != 0)
- goto fail;
- printk(KERN_INFO DRV_NAME ": disabled chipset readahead.\n");
-
- port_info[0] = &info;
- port_info[1] = &info;
- return ata_pci_init_one(pdev, port_info, 2);
-fail:
+ if (rz1000_fifo_disable(pdev) == 0) {
+ port_info[0] = &info;
+ port_info[1] = &info;
+ return ata_pci_init_one(pdev, port_info, 2);
+ }
printk(KERN_ERR DRV_NAME ": failed to disable read-ahead on chipset..\n");
/* Not safe to use so skip */
return -ENODEV;
}
+static int rz1000_reinit_one(struct pci_dev *pdev)
+{
+ /* If this fails on resume (which is a "cant happen" case), we
+ must stop as any progress risks data loss */
+ if (rz1000_fifo_disable(pdev))
+ panic("rz1000 fifo");
+ return ata_pci_device_resume(pdev);
+}
+
static const struct pci_device_id pata_rz1000[] = {
{ PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), },
{ PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), },
@@ -182,7 +198,9 @@ static struct pci_driver rz1000_pci_driver = {
.name = DRV_NAME,
.id_table = pata_rz1000,
.probe = rz1000_init_one,
- .remove = ata_pci_remove_one
+ .remove = ata_pci_remove_one,
+ .suspend = ata_pci_device_suspend,
+ .resume = rz1000_reinit_one,
};
static int __init rz1000_init(void)
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