[PATCH] pata_sil680 suspend/resume

The SI680 can come back from s2ram with the clocks disabled (crash time)
or wrong (ugly as this can cause CRC errors, and in theory corruption).
On a resume we must put the clock back.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 55 insertions, 27 deletions

diff --git a/drivers/ata/pata_sil680.c b/drivers/ata/pata_sil680.c
index 11942fd03b55..5d3b42ec8e47 100644
--- a/drivers/ata/pata_sil680.c
+++ b/drivers/ata/pata_sil680.c
@@ -33,7 +33,7 @@
 #include <linux/libata.h>
 
 #define DRV_NAME "pata_sil680"
-#define DRV_VERSION "0.3.2"
+#define DRV_VERSION "0.4.1"
 
 /**
  *      sil680_selreg           -       return register base
@@ -263,32 +263,20 @@ static struct ata_port_operations sil680_port_ops = {
         .host_stop      = ata_host_stop
 };
 
-static int sil680_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
+/**
+ *      sil680_init_chip                -       chip setup
+ *      @pdev: PCI device
+ *
+ *      Perform all the chip setup which must be done both when the device
+ *      is powered up on boot and when we resume in case we resumed from RAM.
+ *      Returns the final clock settings.
+ */
+ 
+static u8 sil680_init_chip(struct pci_dev *pdev)
 {
-        static struct ata_port_info info = {
-                .sht = &sil680_sht,
-                .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
-                .pio_mask = 0x1f,
-                .mwdma_mask = 0x07,
-                .udma_mask = 0x7f,
-                .port_ops = &sil680_port_ops
-        };
-        static struct ata_port_info info_slow = {
-                .sht = &sil680_sht,
-                .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
-                .pio_mask = 0x1f,
-                .mwdma_mask = 0x07,
-                .udma_mask = 0x3f,
-                .port_ops = &sil680_port_ops
-        };
-        static struct ata_port_info *port_info[2] = {&info, &info};
-        static int printed_version;
         u32 class_rev   = 0;
         u8 tmpbyte      = 0;
 
-        if (!printed_version++)
-                dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
-
         pci_read_config_dword(pdev, PCI_CLASS_REVISION, &class_rev);
         class_rev &= 0xff;
         /* FIXME: double check */
@@ -323,8 +311,6 @@ static int sil680_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
         pci_read_config_byte(pdev,   0x8A, &tmpbyte);
         printk(KERN_INFO "sil680: BA5_EN = %d clock = %02X\n",
                         tmpbyte & 1, tmpbyte & 0x30);
-        if ((tmpbyte & 0x30) == 0)
-                port_info[0] = port_info[1] = &info_slow;
 
         pci_write_config_byte(pdev,  0xA1, 0x72);
         pci_write_config_word(pdev,  0xA2, 0x328A);
@@ -343,11 +329,51 @@ static int sil680_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
                 case 0x20: printk(KERN_INFO "sil680: Using PCI clock.\n");break;
                 /* This last case is _NOT_ ok */
                 case 0x30: printk(KERN_ERR "sil680: Clock disabled ?\n");
-                        return -EIO;
+        }
+        return tmpbyte & 0x30;
+}
+
+static int sil680_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+        static struct ata_port_info info = {
+                .sht = &sil680_sht,
+                .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
+                .pio_mask = 0x1f,
+                .mwdma_mask = 0x07,
+                .udma_mask = 0x7f,
+                .port_ops = &sil680_port_ops
+        };
+        static struct ata_port_info info_slow = {
+                .sht = &sil680_sht,
+                .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
+                .pio_mask = 0x1f,
+                .mwdma_mask = 0x07,
+                .udma_mask = 0x3f,
+                .port_ops = &sil680_port_ops
+        };
+        static struct ata_port_info *port_info[2] = {&info, &info};
+        static int printed_version;
+
+        if (!printed_version++)
+                dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
+
+        switch(sil680_init_chip(pdev))
+        {
+                case 0:
+                        port_info[0] = port_info[1] = &info_slow;
+                        break;
+                case 0x30:
+                        return -ENODEV;
         }
         return ata_pci_init_one(pdev, port_info, 2);
 }
 
+static int sil680_reinit_one(struct pci_dev *pdev)
+{
+        sil680_init_chip(pdev);
+        return ata_pci_device_resume(pdev);
+}
+
 static const struct pci_device_id sil680[] = {
         { PCI_VDEVICE(CMD, PCI_DEVICE_ID_SII_680), },
 
@@ -358,7 +384,9 @@ static struct pci_driver sil680_pci_driver = {
         .name           = DRV_NAME,
         .id_table       = sil680,
         .probe          = sil680_init_one,
-        .remove         = ata_pci_remove_one
+        .remove         = ata_pci_remove_one,
+        .suspend        = ata_pci_device_suspend,
+        .resume         = sil680_reinit_one,
 };
 
 static int __init sil680_init(void)