ide: add IDE_HFLAG_NO_DSC host flag

* Add IDE_HFLAG_NO_DSC host flag for hosts that doesn't support DSC overlap.

* Set it in aec62xx (for ATP850UF only) and hpt34x host drivers.

* Convert ide-tape device driver to check for IDE_HFLAG_NO_DSC flag.

Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

4 files changed, 8 insertions, 12 deletions

diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index 65037a8295a1..73e41cff3738 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -4532,19 +4532,11 @@ static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor)
 
         spin_lock_init(&tape->spinlock);
         drive->dsc_overlap = 1;
-#ifdef CONFIG_BLK_DEV_IDEPCI
-        if (HWIF(drive)->pci_dev != NULL) {
-                /*
-                 * These two ide-pci host adapters appear to need DSC overlap disabled.
-                 * This probably needs further analysis.
-                 */
-                if ((HWIF(drive)->pci_dev->device == PCI_DEVICE_ID_ARTOP_ATP850UF) ||
-                    (HWIF(drive)->pci_dev->device == PCI_DEVICE_ID_TTI_HPT343)) {
-                        printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", tape->name);
-                        drive->dsc_overlap = 0;
-                }
+        if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) {
+                printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n",
+                                 tape->name);
+                drive->dsc_overlap = 0;
         }
-#endif /* CONFIG_BLK_DEV_IDEPCI */
         /* Seagate Travan drives do not support DSC overlap. */
         if (strstr(drive->id->model, "Seagate STT3401"))
                 drive->dsc_overlap = 0;
diff --git a/drivers/ide/pci/aec62xx.c b/drivers/ide/pci/aec62xx.c
index 7f4d1857d555..15597597740f 100644
--- a/drivers/ide/pci/aec62xx.c
+++ b/drivers/ide/pci/aec62xx.c
@@ -202,6 +202,7 @@ static const struct ide_port_info aec62xx_chipsets[] __devinitdata = {
                 .enablebits     = {{0x4a,0x02,0x02}, {0x4a,0x04,0x04}},
                 .host_flags     = IDE_HFLAG_SERIALIZE |
                                   IDE_HFLAG_NO_ATAPI_DMA |
+                                  IDE_HFLAG_NO_DSC |
                                   IDE_HFLAG_ABUSE_SET_DMA_MODE |
                                   IDE_HFLAG_OFF_BOARD,
                 .pio_mask       = ATA_PIO4,
diff --git a/drivers/ide/pci/hpt34x.c b/drivers/ide/pci/hpt34x.c
index dfba0d13fcd3..48a9ff2e8c33 100644
--- a/drivers/ide/pci/hpt34x.c
+++ b/drivers/ide/pci/hpt34x.c
@@ -131,6 +131,7 @@ static void __devinit init_hwif_hpt34x(ide_hwif_t *hwif)
 
 #define IDE_HFLAGS_HPT34X \
         (IDE_HFLAG_NO_ATAPI_DMA | \
+         IDE_HFLAG_NO_DSC | \
          IDE_HFLAG_ABUSE_SET_DMA_MODE | \
          IDE_HFLAG_NO_AUTODMA)
 
diff --git a/include/linux/ide.h b/include/linux/ide.h
index 1b31597e7435..af352cc41db5 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -1095,6 +1095,8 @@ enum {
         IDE_HFLAG_CY82C693              = (1 << 27),
         /* force host out of "simplex" mode */
         IDE_HFLAG_CLEAR_SIMPLEX         = (1 << 28),
+        /* DSC overlap is unsupported */
+        IDE_HFLAG_NO_DSC                = (1 << 29),
 };
 
 #ifdef CONFIG_BLK_DEV_OFFBOARD