1 files changed, 44 insertions, 0 deletions

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index d3b4e25074c1..9825a90d4169 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -824,6 +824,48 @@ static u64 ata_id_n_sectors(const u16 *id)
 }
 
 /**
+ *      ata_id_to_dma_mode      -       Identify DMA mode from id block
+ *      @dev: device to identify
+ *      @mode: mode to assume if we cannot tell
+ *
+ *      Set up the timing values for the device based upon the identify
+ *      reported values for the DMA mode. This function is used by drivers
+ *      which rely upon firmware configured modes, but wish to report the
+ *      mode correctly when possible.
+ *
+ *      In addition we emit similarly formatted messages to the default
+ *      ata_dev_set_mode handler, in order to provide consistency of
+ *      presentation.
+ */
+
+void ata_id_to_dma_mode(struct ata_device *dev, u8 unknown)
+{
+        unsigned int mask;
+        u8 mode;
+
+        /* Pack the DMA modes */
+        mask = ((dev->id[63] >> 8) << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA;
+        if (dev->id[53] & 0x04)
+                mask |= ((dev->id[88] >> 8) << ATA_SHIFT_UDMA) & ATA_MASK_UDMA;
+
+        /* Select the mode in use */
+        mode = ata_xfer_mask2mode(mask);
+
+        if (mode != 0) {
+                ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
+                       ata_mode_string(mask));
+        } else {
+                /* SWDMA perhaps ? */
+                mode = unknown;
+                ata_dev_printk(dev, KERN_INFO, "configured for DMA\n");
+        }
+
+        /* Configure the device reporting */
+        dev->xfer_mode = mode;
+        dev->xfer_shift = ata_xfer_mode2shift(mode);
+}
+
+/**
  *      ata_noop_dev_select - Select device 0/1 on ATA bus
  *      @ap: ATA channel to manipulate
  *      @device: ATA device (numbered from zero) to select
@@ -6276,6 +6318,7 @@ EXPORT_SYMBOL_GPL(ata_bmdma_drive_eh);
 EXPORT_SYMBOL_GPL(ata_bmdma_error_handler);
 EXPORT_SYMBOL_GPL(ata_bmdma_post_internal_cmd);
 EXPORT_SYMBOL_GPL(ata_port_probe);
+EXPORT_SYMBOL_GPL(ata_dev_disable);
 EXPORT_SYMBOL_GPL(sata_set_spd);
 EXPORT_SYMBOL_GPL(sata_phy_debounce);
 EXPORT_SYMBOL_GPL(sata_phy_resume);
@@ -6310,6 +6353,7 @@ EXPORT_SYMBOL_GPL(ata_host_suspend);
 EXPORT_SYMBOL_GPL(ata_host_resume);
 EXPORT_SYMBOL_GPL(ata_id_string);
 EXPORT_SYMBOL_GPL(ata_id_c_string);
+EXPORT_SYMBOL_GPL(ata_id_to_dma_mode);
 EXPORT_SYMBOL_GPL(ata_device_blacklisted);
 EXPORT_SYMBOL_GPL(ata_scsi_simulate);