2 files changed, 36 insertions, 8 deletions

diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index 175d4646333d..09639e7aaa71 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -1082,6 +1082,31 @@ static inline void ata_dump_id(struct ata_device *dev)
                 dev->id[93]);
 }
 
+/*
+ *      Compute the PIO modes available for this device. This is not as
+ *      trivial as it seems if we must consider early devices correctly.
+ *
+ *      FIXME: pre IDE drive timing (do we care ?). 
+ */
+
+static unsigned int ata_pio_modes(struct ata_device *adev)
+{
+        u16 modes;
+
+        /* Usual case. Word 53 indicates word 88 is valid */
+        if (adev->id[ATA_ID_FIELD_VALID] & (1 << 2)) {
+                modes = adev->id[ATA_ID_PIO_MODES] & 0x03;
+                modes <<= 3;
+                modes |= 0x7;
+                return modes;
+        }
+
+        /* If word 88 isn't valid then Word 51 holds the PIO timing number
+           for the maximum. Turn it into a mask and return it */
+        modes = (2 << (adev->id[ATA_ID_OLD_PIO_MODES] & 0xFF)) - 1 ;
+        return modes;
+}
+
 /**
  *      ata_dev_identify - obtain IDENTIFY x DEVICE page
  *      @ap: port on which device we wish to probe resides
@@ -1215,10 +1240,8 @@ retry:
         xfer_modes = dev->id[ATA_ID_UDMA_MODES];
         if (!xfer_modes)
                 xfer_modes = (dev->id[ATA_ID_MWDMA_MODES]) << ATA_SHIFT_MWDMA;
-        if (!xfer_modes) {
-                xfer_modes = (dev->id[ATA_ID_PIO_MODES]) << (ATA_SHIFT_PIO + 3);
-                xfer_modes |= (0x7 << ATA_SHIFT_PIO);
-        }
+        if (!xfer_modes)
+                xfer_modes = ata_pio_modes(dev);
 
         ata_dump_id(dev);
 
diff --git a/include/linux/ata.h b/include/linux/ata.h
index 630908c9378b..33276d1d05d2 100644
--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -42,13 +42,18 @@ enum {
         ATA_SECT_SIZE           = 512,
 
         ATA_ID_WORDS            = 256,
-        ATA_ID_PROD_OFS         = 27,
-        ATA_ID_FW_REV_OFS       = 23,
         ATA_ID_SERNO_OFS        = 10,
-        ATA_ID_MAJOR_VER        = 80,
-        ATA_ID_PIO_MODES        = 64,
+        ATA_ID_FW_REV_OFS       = 23,
+        ATA_ID_PROD_OFS         = 27,
+        ATA_ID_OLD_PIO_MODES    = 51,
+        ATA_ID_FIELD_VALID      = 53,
         ATA_ID_MWDMA_MODES      = 63,
+        ATA_ID_PIO_MODES        = 64,
+        ATA_ID_EIDE_DMA_MIN     = 65,
+        ATA_ID_EIDE_PIO         = 67,
+        ATA_ID_EIDE_PIO_IORDY   = 68,
         ATA_ID_UDMA_MODES       = 88,
+        ATA_ID_MAJOR_VER        = 80,
         ATA_ID_PIO4             = (1 << 1),
 
         ATA_PCI_CTL_OFS         = 2,