libata: relocate forcing PIO0 on reset

Forcing PIO0 on reset was done inside ata_bus_softreset(), which is a
bit out of place as it should be applied to all resets - hard, soft
and implementation which don't use ata_bus_softreset().  Relocate it
such that...

* For new EH, it's done in ata_eh_reset() before calling prereset.

* For old EH, it's done before calling ap->ops->phy_reset() in
  ata_bus_probe().

This makes PIO0 forced after all resets.  Another difference is that
reset itself is done after PIO0 is forced.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Acked-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 8ee56e5cfb0c945cb067c15e0d33a81dca3bf922..bdd8778e5256e2213d094d342b8315e9fbbec008 100644 (file)
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -2219,6 +2219,25 @@ int ata_bus_probe(struct ata_port *ap)
                tries[dev->devno] = ATA_PROBE_MAX_TRIES;
 
  retry:
+       ata_link_for_each_dev(dev, &ap->link) {
+               /* If we issue an SRST then an ATA drive (not ATAPI)
+                * may change configuration and be in PIO0 timing. If
+                * we do a hard reset (or are coming from power on)
+                * this is true for ATA or ATAPI. Until we've set a
+                * suitable controller mode we should not touch the
+                * bus as we may be talking too fast.
+                */
+               dev->pio_mode = XFER_PIO_0;
+
+               /* If the controller has a pio mode setup function
+                * then use it to set the chipset to rights. Don't
+                * touch the DMA setup as that will be dealt with when
+                * configuring devices.
+                */
+               if (ap->ops->set_piomode)
+                       ap->ops->set_piomode(ap, dev);
+       }
+
        /* reset and determine device classes */
        ap->ops->phy_reset(ap);
 
@@ -2234,12 +2253,6 @@ int ata_bus_probe(struct ata_port *ap)
 
        ata_port_probe(ap);
 
-       /* after the reset the device state is PIO 0 and the controller
-          state is undefined. Record the mode */
-
-       ata_link_for_each_dev(dev, &ap->link)
-               dev->pio_mode = XFER_PIO_0;
-
        /* read IDENTIFY page and configure devices. We have to do the identify
           specific sequence bass-ackwards so that PDIAG- is released by
           the slave device */
@@ -3272,8 +3285,6 @@ static int ata_bus_softreset(struct ata_port *ap, unsigned int devmask,
                             unsigned long deadline)
 {
        struct ata_ioports *ioaddr = &ap->ioaddr;
-       struct ata_device *dev;
-       int i = 0;
 
        DPRINTK("ata%u: bus reset via SRST\n", ap->print_id);
 
@@ -3284,25 +3295,6 @@ static int ata_bus_softreset(struct ata_port *ap, unsigned int devmask,
        udelay(20);     /* FIXME: flush */
        iowrite8(ap->ctl, ioaddr->ctl_addr);
 
-       /* If we issued an SRST then an ATA drive (not ATAPI)
-        * may have changed configuration and be in PIO0 timing. If
-        * we did a hard reset (or are coming from power on) this is
-        * true for ATA or ATAPI. Until we've set a suitable controller
-        * mode we should not touch the bus as we may be talking too fast.
-        */
-
-       ata_link_for_each_dev(dev, &ap->link)
-               dev->pio_mode = XFER_PIO_0;
-
-       /* If the controller has a pio mode setup function then use
-          it to set the chipset to rights. Don't touch the DMA setup
-          as that will be dealt with when revalidating */
-       if (ap->ops->set_piomode) {
-               ata_link_for_each_dev(dev, &ap->link)
-                       if (devmask & (1 << i++))
-                               ap->ops->set_piomode(ap, dev);
-       }
-
        /* wait a while before checking status */
        ata_wait_after_reset(ap, deadline);
 

diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index 496edaff119a2ec7d5681dbace21606b01d6577e..b237ff18b39eb0fecb4e69a4de30adaf011ff88d 100644 (file)
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -2083,6 +2083,25 @@ int ata_eh_reset(struct ata_link *link, int classify,
 
        ata_eh_about_to_do(link, NULL, ehc->i.action & ATA_EH_RESET_MASK);
 
+       ata_link_for_each_dev(dev, link) {
+               /* If we issue an SRST then an ATA drive (not ATAPI)
+                * may change configuration and be in PIO0 timing. If
+                * we do a hard reset (or are coming from power on)
+                * this is true for ATA or ATAPI. Until we've set a
+                * suitable controller mode we should not touch the
+                * bus as we may be talking too fast.
+                */
+               dev->pio_mode = XFER_PIO_0;
+
+               /* If the controller has a pio mode setup function
+                * then use it to set the chipset to rights. Don't
+                * touch the DMA setup as that will be dealt with when
+                * configuring devices.
+                */
+               if (ap->ops->set_piomode)
+                       ap->ops->set_piomode(ap, dev);
+       }
+
        /* Determine which reset to use and record in ehc->i.action.
         * prereset() may examine and modify it.
         */