libata: reimplement ata_acpi_cbl_80wire() using ata_acpi_gtm_xfermask()

Reimplement ata_acpi_cbl_80wire() using ata_acpi_gtm_xfermask() and
while at it relocate the function below ata_acpi_gtm_xfermask().

New ata_acpi_cbl_80wire() implementation takes @gtm, in both pata_via
and pata_amd, use the initial GTM value.  Both are trying to peek
initial BIOS configuration, so using initial caching value makes
sense.  This fixes ACPI part of cable detection in pata_amd which
previously always returned 0 because configuring PIO0 during reset
clears DMA configuration.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

3 files changed, 20 insertions, 27 deletions

diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c
index a6f1a6b56d8c..9e8ec19260af 100644
--- a/drivers/ata/libata-acpi.c
+++ b/drivers/ata/libata-acpi.c
@@ -490,38 +490,29 @@ EXPORT_SYMBOL_GPL(ata_acpi_gtm_xfermask);
 /**
  * ata_acpi_cbl_80wire          -       Check for 80 wire cable
  * @ap: Port to check
+ * @gtm: GTM data to use
  *
- * Return 1 if the ACPI mode data for this port indicates the BIOS selected
- * an 80wire mode.
+ * Return 1 if the @gtm indicates the BIOS selected an 80wire mode.
  */
-
-int ata_acpi_cbl_80wire(struct ata_port *ap)
+int ata_acpi_cbl_80wire(struct ata_port *ap, const struct ata_acpi_gtm *gtm)
 {
-        const struct ata_acpi_gtm *gtm = ata_acpi_init_gtm(ap);
-        int valid = 0;
+        struct ata_device *dev;
 
-        if (!gtm)
-                return 0;
+        ata_link_for_each_dev(dev, &ap->link) {
+                unsigned long xfer_mask, udma_mask;
+
+                if (!ata_dev_enabled(dev))
+                        continue;
+
+                xfer_mask = ata_acpi_gtm_xfermask(dev, gtm);
+                ata_unpack_xfermask(xfer_mask, NULL, NULL, &udma_mask);
+
+                if (udma_mask & ~ATA_UDMA_MASK_40C)
+                        return 1;
+        }
 
-        /* Split timing, DMA enabled */
-        if ((gtm->flags & 0x11) == 0x11 && gtm->drive[0].dma < 55)
-                valid |= 1;
-        if ((gtm->flags & 0x14) == 0x14 && gtm->drive[1].dma < 55)
-                valid |= 2;
-        /* Shared timing, DMA enabled */
-        if ((gtm->flags & 0x11) == 0x01 && gtm->drive[0].dma < 55)
-                valid |= 1;
-        if ((gtm->flags & 0x14) == 0x04 && gtm->drive[0].dma < 55)
-                valid |= 2;
-
-        /* Drive check */
-        if ((valid & 1) && ata_dev_enabled(&ap->link.device[0]))
-                return 1;
-        if ((valid & 2) && ata_dev_enabled(&ap->link.device[1]))
-                return 1;
         return 0;
 }
-
 EXPORT_SYMBOL_GPL(ata_acpi_cbl_80wire);
 
 static void ata_acpi_gtf_to_tf(struct ata_device *dev,
diff --git a/drivers/ata/pata_amd.c b/drivers/ata/pata_amd.c
index 3cc27b514654..e71125a4bd9b 100644
--- a/drivers/ata/pata_amd.c
+++ b/drivers/ata/pata_amd.c
@@ -272,7 +272,8 @@ static int nv_cable_detect(struct ata_port *ap)
         if ((udma & 0xC4) == 0xC4 || (udma & 0xC400) == 0xC400)
                 cbl = ATA_CBL_PATA80;
         /* And a triple check across suspend/resume with ACPI around */
-        if (ata_acpi_cbl_80wire(ap))
+        if (ata_acpi_init_gtm(ap) &&
+            ata_acpi_cbl_80wire(ap, ata_acpi_init_gtm(ap)))
                 cbl = ATA_CBL_PATA80;
         return cbl;
 }
diff --git a/drivers/ata/pata_via.c b/drivers/ata/pata_via.c
index 453d72bf2598..39627ab684bf 100644
--- a/drivers/ata/pata_via.c
+++ b/drivers/ata/pata_via.c
@@ -185,7 +185,8 @@ static int via_cable_detect(struct ata_port *ap) {
         if (ata66 & (0x10100000 >> (16 * ap->port_no)))
                 return ATA_CBL_PATA80;
         /* Check with ACPI so we can spot BIOS reported SATA bridges */
-        if (ata_acpi_cbl_80wire(ap))
+        if (ata_acpi_init_gtm(ap) &&
+            ata_acpi_cbl_80wire(ap, ata_acpi_init_gtm(ap)))
                 return ATA_CBL_PATA80;
         return ATA_CBL_PATA40;
 }