(2.6.20) pata_mpiix: fix PIO setup issues

Fix clearing/setting the wrong TIME/IE/PPE bits for a slave drive caused by a
wrong shift count.
Fix the PIO mode 1 being overclocked by wrongly selecting the fast timing bank.
Also, fix/rephrase some comments while at it.

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 10 insertions, 9 deletions

diff --git a/drivers/ata/pata_mpiix.c b/drivers/ata/pata_mpiix.c
index 976663d1fb22..4e97a7efccef 100644
--- a/drivers/ata/pata_mpiix.c
+++ b/drivers/ata/pata_mpiix.c
@@ -35,7 +35,7 @@
 #include <linux/libata.h>
 
 #define DRV_NAME "pata_mpiix"
-#define DRV_VERSION "0.7.3"
+#define DRV_VERSION "0.7.4"
 
 enum {
         IDETIM = 0x6C,          /* IDE control register */
@@ -80,8 +80,8 @@ static void mpiix_error_handler(struct ata_port *ap)
  *      @adev: ATA device
  *
  *      Called to do the PIO mode setup. The MPIIX allows us to program the
- *      IORDY sample point (2-5 clocks), recovery 1-4 clocks and whether
- *      prefetching or iordy are used.
+ *      IORDY sample point (2-5 clocks), recovery (1-4 clocks) and whether
+ *      prefetching or IORDY are used.
  *
  *      This would get very ugly because we can only program timing for one
  *      device at a time, the other gets PIO0. Fortunately libata calls
@@ -103,18 +103,19 @@ static void mpiix_set_piomode(struct ata_port *ap, struct ata_device *adev)
                             { 2, 3 }, };
 
         pci_read_config_word(pdev, IDETIM, &idetim);
-        /* Mask the IORDY/TIME/PPE0 bank for this device */
+
+        /* Mask the IORDY/TIME/PPE for this device */
         if (adev->class == ATA_DEV_ATA)
-                control |= PPE;         /* PPE enable for disk */
+                control |= PPE;         /* Enable prefetch/posting for disk */
         if (ata_pio_need_iordy(adev))
-                control |= IORDY;       /* IORDY */
-        if (pio > 0)
+                control |= IORDY;
+        if (pio > 1)
                 control |= FTIM;        /* This drive is on the fast timing bank */
 
         /* Mask out timing and clear both TIME bank selects */
         idetim &= 0xCCEE;
-        idetim &= ~(0x07  << (2 * adev->devno));
-        idetim |= (control << (2 * adev->devno));
+        idetim &= ~(0x07  << (4 * adev->devno));
+        idetim |= control << (4 * adev->devno);
 
         idetim |= (timings[pio][0] << 12) | (timings[pio][1] << 8);
         pci_write_config_word(pdev, IDETIM, idetim);