pata_sl82c105: remove un-needed code paths

Remove the DMA setup function. As pointed out by Sergey we set the actual
DMA clock timing in set_dmamode so we don't actually need to do anything
with it at set up time, but just leave the PIO timings loaded.

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

1 files changed, 9 insertions, 30 deletions

diff --git a/drivers/ata/pata_sl82c105.c b/drivers/ata/pata_sl82c105.c
index 96e890fd645b..07204610f0da 100644
--- a/drivers/ata/pata_sl82c105.c
+++ b/drivers/ata/pata_sl82c105.c
@@ -7,6 +7,13 @@
  *              SL82C105/Winbond 553 IDE driver
  *
  * and in part on the documentation and errata sheet
+ *
+ *
+ * Note: The controller like many controllers has shared timings for
+ * PIO and DMA. We thus flip to the DMA timings in dma_start and flip back
+ * in the dma_stop function. Thus we actually don't need a set_dmamode
+ * method as the PIO method is always called and will set the right PIO
+ * timing parameters.
  */
 
 #include <linux/kernel.h>
@@ -19,7 +26,7 @@
 #include <linux/libata.h>
 
 #define DRV_NAME "pata_sl82c105"
-#define DRV_VERSION "0.2.3"
+#define DRV_VERSION "0.2.5"
 
 enum {
         /*
@@ -126,33 +133,6 @@ static void sl82c105_configure_dmamode(struct ata_port *ap, struct ata_device *a
 }
 
 /**
- *      sl82c105_set_dmamode    -       set initial DMA mode data
- *      @ap: ATA interface
- *      @adev: ATA device
- *
- *      Called to do the DMA mode setup. This replaces the PIO timings
- *      for the device in question. Set appropriate PIO timings not DMA
- *      timings at this point.
- */
-
-static void sl82c105_set_dmamode(struct ata_port *ap, struct ata_device *adev)
-{
-        switch(adev->dma_mode) {
-                case XFER_MW_DMA_0:
-                        sl82c105_configure_piomode(ap, adev, 0);
-                        break;
-                case XFER_MW_DMA_1:
-                        sl82c105_configure_piomode(ap, adev, 3);
-                        break;
-                case XFER_MW_DMA_2:
-                        sl82c105_configure_piomode(ap, adev, 4);
-                        break;
-                default:
-                        BUG();
-        }
-}
-
-/**
  *      sl82c105_reset_engine   -       Reset the DMA engine
  *      @ap: ATA interface
  *
@@ -222,7 +202,7 @@ static void sl82c105_bmdma_stop(struct ata_queued_cmd *qc)
 
         /* This will redo the initial setup of the DMA device to matching
            PIO timings */
-        sl82c105_set_dmamode(ap, qc->dev);
+        sl82c105_set_piomode(ap, qc->dev);
 }
 
 static struct scsi_host_template sl82c105_sht = {
@@ -246,7 +226,6 @@ static struct scsi_host_template sl82c105_sht = {
 static struct ata_port_operations sl82c105_port_ops = {
         .port_disable   = ata_port_disable,
         .set_piomode    = sl82c105_set_piomode,
-        .set_dmamode    = sl82c105_set_dmamode,
         .mode_filter    = ata_pci_default_filter,
 
         .tf_load        = ata_tf_load,