1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/scsi/aic7xxx/aic79xx_osm.c b/drivers/scsi/aic7xxx/aic79xx_osm.c
index e7a32f8e1a5c..9bfcca5ede08 100644
--- a/drivers/scsi/aic7xxx/aic79xx_osm.c
+++ b/drivers/scsi/aic7xxx/aic79xx_osm.c
@@ -2694,7 +2694,25 @@ static void ahd_linux_set_hold_mcs(struct scsi_target *starget, int hold)
         ahd_unlock(ahd, &flags);
 }
 
+static void ahd_linux_get_signalling(struct Scsi_Host *shost)
+{
+        struct ahd_softc *ahd = *(struct ahd_softc **)shost->hostdata;
+        unsigned long flags;
+        u8 mode;
 
+        ahd_lock(ahd, &flags);
+        ahd_pause(ahd);
+        mode = ahd_inb(ahd, SBLKCTL);
+        ahd_unpause(ahd);
+        ahd_unlock(ahd, &flags);
+
+        if (mode & ENAB40)
+                spi_signalling(shost) = SPI_SIGNAL_LVD;
+        else if (mode & ENAB20)
+                spi_signalling(shost) = SPI_SIGNAL_SE;
+        else
+                spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
+}
 
 static struct spi_function_template ahd_linux_transport_functions = {
         .set_offset     = ahd_linux_set_offset,
@@ -2719,6 +2737,7 @@ static struct spi_function_template ahd_linux_transport_functions = {
         .show_pcomp_en  = 1,
         .set_hold_mcs   = ahd_linux_set_hold_mcs,
         .show_hold_mcs  = 1,
+        .get_signalling = ahd_linux_get_signalling,
 };
 
 static int __init