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

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"ide: fix drive side 80c cable check, take 2" patch from Tejun Heo (commit
fab59375b9) 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 f31f0cc2f0. ]

Thanks goes out to Fernando Mitio Yamada for reporting the problem
and patiently testing patches.

Acked-by: Tejun Heo <htejun@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2007-03-26 23:03:18 +02:00
parent e0f2e3a06b
commit f68d9320cd
1 changed files with 6 additions and 2 deletions
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8
drivers/ide/ide-iops.c
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@ -583,8 +583,12 @@ u8 eighty_ninty_three (ide_drive_t *drive)
if(!(drive->id->hw_config & 0x4000)) if(!(drive->id->hw_config & 0x4000))
return 0; return 0;
#endif /* CONFIG_IDEDMA_IVB */ #endif /* CONFIG_IDEDMA_IVB */
if (!(drive->id->hw_config & 0x2000)) /*
return 0; * FIXME:
* - change master/slave IDENTIFY order
* - force bit13 (80c cable present) check
* (unless the slave device is pre-ATA3)
*/
return 1; return 1;
} }