[PATCH] pata_cs5520: resume support

Alan
2006-11-22T16:55:31Z

The CS5520 doesn't need much help to resume but we do need to restore
pcicfg which may have been reset to the BIOS default which is
sometimes incorrect.

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

diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.19-rc5-mm2/drivers/ata/pata_cs5520.c linux-2.6.19-rc5-mm2/drivers/ata/pata_cs5520.c
--- linux.vanilla-2.6.19-rc5-mm2/drivers/ata/pata_cs5520.c 2006-11-15 13:25:59.000000000 +0000
+++ linux-2.6.19-rc5-mm2/drivers/ata/pata_cs5520.c 2006-11-22 15:01:20.215376872 +0000
@@ -41,7 +41,7 @@
#include <linux/libata.h>

#define DRV_NAME "pata_cs5520"
-#define DRV_VERSION "0.6.2"
+#define DRV_VERSION "0.6.3"

struct pio_clocks
{
@@ -167,6 +167,8 @@
.dma_boundary = ATA_DMA_BOUNDARY,
.slave_configure = ata_scsi_slave_config,
.bios_param = ata_std_bios_param,
+ .resume = ata_scsi_device_resume,
+ .suspend = ata_scsi_device_suspend,
};

static struct ata_port_operations cs5520_port_ops = {
@@ -296,6 +298,22 @@
dev_set_drvdata(dev, NULL);
}

+/**
+ * cs5520_reinit_one - device resume
+ * @pdev: PCI device
+ *
+ * Do any reconfiguration work needed by a resume from RAM. We need
+ * to restore DMA mode support on BIOSen which disabled it
+ */
+
+static int cs5520_reinit_one(struct pci_dev *pdev)
+{
+ u8 pcicfg;
+ pci_read_config_byte(pdev, 0x60, &pcicfg);
+ if ((pcicfg & 0x40) == 0)
+ pci_write_config_byte(pdev, 0x60, pcicfg | 0x40);
+ return ata_pci_device_resume(pdev);
+}
/* For now keep DMA off. We can set it for all but A rev CS5510 once the
core ATA code can handle it */

@@ -310,7 +328,9 @@
.name = DRV_NAME,
.id_table = pata_cs5520,
.probe = cs5520_init_one,
- .remove = cs5520_remove_one
+ .remove = cs5520_remove_one,
+ .suspend = ata_pci_device_suspend,
+ .resume = cs5520_reinit_one,
};

static int __init cs5520_init(void)