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SubjectLibata PATA status
Libata General with respect to PATA
====================================
Wrong port and IRQ reporting - IRQ now fixed by Tejun, port reporting
fixes sent to Andrew. All these are cosmetic and don't harm debug.

Still can't user set drive speed or user issue commands at a given speed.
Needed to allow users to bump cable rules, fix strange stuff and for some
emulated chips to issue RAID control ATA packets in PIO0 (no I've no idea
why they only work in PIO0 ;)).

No serialization of channel pairs.

PATA General
============
Current kernels now support HPA (Host Protected Area) but default to
honouring it. Probably a wrong default for PATA but we need to decide the
right way to expose it nicely.

Cable detection should now be sane. Still issues with SATA bridges. Some
test hacks in my code base but nothing for upstream yet.

My tree has global DMA control aka ide=nodma. Need to decide the best way
to push a version of this.

Ancient non IORDY capable devices need patches still in my devel tree

Post SRST we need to decide what to do about mode setting - do we put the
controller in PIO0 specifically ? My tree does and this seems to help on
non PC systems.

No PATA hotplug support yet. Need warmplug helpers for some chipsets (eg
some intel ICH) to avoid risk of hangs.


Chipsets
========
PIIX
Tejun should have the MWDMA bugs fixed otherwise so far so good.
Mostly maintained by other people.
ACPI
Driver needs a rewrite based upon what has been learned about the
BIOS handling of the ACPI methods. On the TODO list
ALI
2.6.22rc7 fixed the last known non-atapi bug. Stil some ATAPI
problem reports unresolved
AMD
Solid. ACPI tweaks in my tree for Nvidia cable detect and pushed
to -mm. Target for 2.6.23
ARTOP
No reports, but nobody appears to be using one
ATIIXP
Rock solid. For SATA side use AHCI
CMD640
Seems to work but still little testing
CMD64X
Tested on x86, needs more Sparc/Alpha feedback
CS5520
Solid for PIO. No virtual DMA support (and none likely unless its
contributed)
CS5530
Obscure hang bug fix just sent to -mm tree but not observed in
real world use. Otherwise stable
CS5535
No reports
CYPRESS
Needs someone with an ancient Alpha. May drop entirely
EFAR
Seems solid. Needs some PIIX updates cross checking for EFAR
relevance. Low priority
GENERIC
Fix for "DMA set up but not used" bug in -git
HPT366
Seems to be solid. Needs a backport of the chip detect changes
Sergei just finished for old IDE. Low priority no real impact from
their lack
HPT37X
Working but some further work required to get it behaving on all
combinations
HPT3X2N
Still has problems on some systems. Tracking the work being done
in old-ide which seems to behave similarly
HPT3X3
Solid PIO support sent to -mm. DMA is problematic. Doesn't work
with old IDE at all so not too problematic. Doesn't work in
base kernel
ISAPNP
Seems to work, no bug reports but not many users
IT8212
Multiple fixes, should now be stable in RAID and Pass-through
modes thanks to driver fixes and core fixes from Tejun
IT8213
No idea
JMICRON
Works reliably. No recent changes
LEGACY
Works ok. Complete rewrite in progress to clean up all the
pre-PCI support
TRIFLEX
Solid, no recent changes.
MARVELL
Solid, will be replaced by PATA AHCI-like support in time
(but not by me)
MPIIX
Solid, no recent changes
OLDPIIX
Solid, no recent changes
NETCELL
Solid, no recent changes
NS87410
Still experimental, almost no users
OPTIPIO
Very much experimental but seems to work
OPTIDMA
Very much experimental, but seems to work. Only one user known
however
PCMCIA
Works reliably. Some problems with IRQ routing on some CF cards
that seem to be card related. Works on systems with no DMA API
support as of patches sent to -mm
PDC_OLD
2.6.22-git has cable detection bug fixed
QDI
Works, will be folded into LEGACY rewrite
RADISYS
Very experimental, no changes, low priority
RZ1000
Solid, works, no changes
SC1200
Single channel only still. Needs work for dual channel
-mm has fix for a DMA hang bug
SERVERWORKS
Solid, no changes of note
SIL680
Solid, no recent changes
SIS
Current tree fixes crash on boot some users reported, code
cleanups, no other major changes for pure PATA devices
VIA
Solid. Sent acpi patch for -mm to try and fix the one remaining
mystery "how to spot VIA with onboard SATA bridges properly. If
you've got a VIA board with SATA ports that appear as PATA
channels please drop me an email as I'd like to get more info
on what is affected.
WINBOND
No changes, still experimental
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