[patch 29/37] ide: revert "ide: fix drive side 80c cable check, take 2" for now

[Greg KH <gregkh@suse.de>]

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-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

[PATCH] ide: revert "ide: fix drive side 80c cable check, take 2" for now

"ide: fix drive side 80c cable check, take 2" patch from Tejun Heo (commit
fab59375b9543f84d1714f7dd00f5d11e531bd3e) fixed 80c bit test (bit13 of word93)
but we also need to fix master/slave IDENTIFY order (slave device should be
probed first in order to make it release PDIAG- signal) and we should also
check for pre-ATA3 slave devices (which may not release PDIAG- signal).

Unfortunately the fact that IDE driver doesn't reset devices itself helps
only a bit as it seems that some BIOS-es reset ATA devices after programming
the chipset, some BIOS-es can be set to not probe/configure selected devices,
there may be no BIOS in case of add-on cards etc.

Since we are quite late in the release cycle and the required changes will
affect a lot of systems just revert the fix for now.

[ Please also see libata commit f31f0cc2f0b7527072d94d02da332d9bb8d7d94c. ]

Cc: Chuck Ebbert <cebbert@redhat.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 drivers/ide/ide-iops.c |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/drivers/ide/ide-iops.c
+++ b/drivers/ide/ide-iops.c
@@ -598,6 +598,9 @@ u8 eighty_ninty_three (ide_drive_t *driv
 	if(HWIF(drive)->udma_four == 0)
 		return 0;
 
+	printk(KERN_INFO "%s: hw_config=%04x\n",
+			 drive->name, drive->id->hw_config);
+
 	/* Check for SATA but only if we are ATA5 or higher */
 	if (drive->id->hw_config == 0 && (drive->id->major_rev_num & 0x7FE0))
 		return 1;
@@ -607,8 +610,14 @@ u8 eighty_ninty_three (ide_drive_t *driv
 	if(!(drive->id->hw_config & 0x4000))
 		return 0;
 #endif /* CONFIG_IDEDMA_IVB */
+/*
+ * FIXME: enable this after fixing master/slave IDENTIFY order,
+ *	  also ignore the result if the slave device is pre-ATA3 one
+ */
+#if 0
 	if (!(drive->id->hw_config & 0x2000))
 		return 0;
+#endif
 	return 1;
 }
 

--