Tejun Heo wrote:
Hello, all.
During 2.6.24-rc1, libata enabled ATA-ACPI support by default and there
have been a lot of regression reports stemming from it. I have patchset
ready to fix most of the problems. With these patches applied, libata
should be able to cope with most failures pretty well. There is one
remaining issue tho.
libata caches the result of _GTM during controller for later use. The
primary use is to peek at how BIOS configured the controller. Some
controllers (pata_via and pata_amd) lack proper cable detection and BIOS
configured values are used as reference. This caching is done before
any other operation is performed on the port to avoid caching corrupted
data.
Problem is that _GTM implementation on certain BIOSen crap themselves if
invoked on empty channels. However, as written above, because initial
_GTM caching is done before any actual operation is performed on the
port, libata can't determine whether the port is occupied or not when
trying to cache _GTM result. Unfortunately, VIA PATA is on both
categories - it needs _GTM caching but can't cope with _GTM invocation
on empty ports. Yay!
I seem to have lost the thread/bug report where we decided that one
board always choked on an empty channel. Maybe it's not that and it's
just another case of the same issue where our resetting default timing
values on the controller before calling _GTM would choke the _GTM method?
--
Robert Hancock Saskatoon, SK, Canada
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