ide: add cable detection for early UDMA66 devices (take 3)

* Move ide_in_drive_list() from ide-dma.c to ide-iops.c.

* Add ivb_list[] table for listening early UDMA66 devices which don't conform
  to ATA4 standard wrt cable detection (bit14 is zero, only bit13 is valid)
  and use only device side cable detection for them since host side cable
  detection may be unreliable.

* Add model "QUANTUM FIREBALLlct10 05" with firwmare "A03.0900" to the list
  (from Craig's bugreport).

v2:
* Improve kernel message basing on suggestion from Sergei.

v3:
* Don't print kernel message when no device side cable detection is done,
  plus some minor fixes.  (Noticed by Sergei)

Thanks to Craig for testing this patch.

Cc: Craig Block <chblock3@yahoo.com>
Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

3 files changed, 38 insertions, 23 deletions

diff --git a/drivers/ide/ide-dma.c b/drivers/ide/ide-dma.c
index 865a2740a6e3..ff644a5e12cd 100644
--- a/drivers/ide/ide-dma.c
+++ b/drivers/ide/ide-dma.c
@@ -135,25 +135,6 @@ static const struct drive_list_entry drive_blacklist [] = {
 };
 
 /**
- *	ide_in_drive_list	-	look for drive in black/white list
- *	@id: drive identifier
- *	@drive_table: list to inspect
- *
- *	Look for a drive in the blacklist and the whitelist tables
- *	Returns 1 if the drive is found in the table.
- */
-
-int ide_in_drive_list(struct hd_driveid *id, const struct drive_list_entry *drive_table)
-{
-	for ( ; drive_table->id_model ; drive_table++)
-		if ((!strcmp(drive_table->id_model, id->model)) &&
-		    (!drive_table->id_firmware ||
-		     strstr(id->fw_rev, drive_table->id_firmware)))
-			return 1;
-	return 0;
-}
-
-/**
  *	ide_dma_intr	-	IDE DMA interrupt handler
  *	@drive: the drive the interrupt is for
  *
diff --git a/drivers/ide/ide-iops.c b/drivers/ide/ide-iops.c
index 92578b6832e9..fe2a69fed72b 100644
--- a/drivers/ide/ide-iops.c
+++ b/drivers/ide/ide-iops.c
@@ -565,6 +565,34 @@ int ide_wait_stat (ide_startstop_t *startstop, ide_drive_t *drive, u8 good, u8 b
 
 EXPORT_SYMBOL(ide_wait_stat);
 
+/**
+ *	ide_in_drive_list	-	look for drive in black/white list
+ *	@id: drive identifier
+ *	@drive_table: list to inspect
+ *
+ *	Look for a drive in the blacklist and the whitelist tables
+ *	Returns 1 if the drive is found in the table.
+ */
+
+int ide_in_drive_list(struct hd_driveid *id, const struct drive_list_entry *drive_table)
+{
+	for ( ; drive_table->id_model; drive_table++)
+		if ((!strcmp(drive_table->id_model, id->model)) &&
+		    (!drive_table->id_firmware ||
+		     strstr(id->fw_rev, drive_table->id_firmware)))
+			return 1;
+	return 0;
+}
+
+/*
+ * Early UDMA66 devices don't set bit14 to 1, only bit13 is valid.
+ * We list them here and depend on the device side cable detection for them.
+ */
+static const struct drive_list_entry ivb_list[] = {
+	{ "QUANTUM FIREBALLlct10 05"	, "A03.0900"	},
+	{ NULL				, NULL		}
+};
+
 /*
  *  All hosts that use the 80c ribbon must use!
  *  The name is derived from upper byte of word 93 and the 80c ribbon.
@@ -573,11 +601,16 @@ u8 eighty_ninty_three (ide_drive_t *drive)
 {
 	ide_hwif_t *hwif = drive->hwif;
 	struct hd_driveid *id = drive->id;
+	int ivb = ide_in_drive_list(id, ivb_list);
 
 	if (hwif->cbl == ATA_CBL_PATA40_SHORT)
 		return 1;
 
-	if (hwif->cbl != ATA_CBL_PATA80)
+	if (ivb)
+		printk(KERN_DEBUG "%s: skipping word 93 validity check\n",
+				  drive->name);
+
+	if (hwif->cbl != ATA_CBL_PATA80 && !ivb)
 		goto no_80w;
 
 	/* Check for SATA but only if we are ATA5 or higher */
@@ -587,11 +620,11 @@ u8 eighty_ninty_three (ide_drive_t *drive)
 	/*
 	 * FIXME:
 	 * - change master/slave IDENTIFY order
-	 * - force bit13 (80c cable present) check
+	 * - force bit13 (80c cable present) check also for !ivb devices
 	 *   (unless the slave device is pre-ATA3)
 	 */
 #ifndef CONFIG_IDEDMA_IVB
-	if (id->hw_config & 0x4000)
+	if ((id->hw_config & 0x4000) || (ivb && (id->hw_config & 0x2000)))
 #else
 	if (id->hw_config & 0x6000)
 #endif
diff --git a/include/linux/ide.h b/include/linux/ide.h
index 7e15e0870290..c792b4fd1588 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -1285,13 +1285,14 @@ void ide_init_sg_cmd(ide_drive_t *, struct request *);
 #define BAD_DMA_DRIVE		0
 #define GOOD_DMA_DRIVE		1
 
-#ifdef CONFIG_BLK_DEV_IDEDMA
 struct drive_list_entry {
 	const char *id_model;
 	const char *id_firmware;
 };
 
 int ide_in_drive_list(struct hd_driveid *, const struct drive_list_entry *);
+
+#ifdef CONFIG_BLK_DEV_IDEDMA
 int __ide_dma_bad_drive(ide_drive_t *);
 int __ide_dma_good_drive(ide_drive_t *);
 u8 ide_max_dma_mode(ide_drive_t *);