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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Arnd Bergmann <arnd@arndb.de>
Cc: linuxppc-dev@ozlabs.org, Paul Mackerras <paulus@samba.org>,
	Anton Blanchard <anton@samba.org>
Subject: Re: [RFC/PATCH] powerpc: Rewrite IO allocation & mapping on powerpc64
Date: Tue, 15 May 2007 10:06:17 +1000	[thread overview]
Message-ID: <1179187577.32247.140.camel@localhost.localdomain> (raw)
In-Reply-To: <200705150139.41722.arnd@arndb.de>


> An interesting case is the frame buffer, most fb drivers use hardcoded
> register numbers for the VGA ports, without calling check_legacy_ioport,
> but rely on PCI probing to detect the presence of the device.
> Some IDE drivers do the same, but libata does not. Apparently, these
> are already broken if you plug such hardware into a secondary PCI bus.

VGA is on my todo list for a fix. A lot of framebuffers don't access
legacy VGA ports though. I'm pretty sure none of the ATI or nvidia ones
do nowadays.

We need three different things I beleive:

 - A clean/generic way to obtain the pci_dev for vgacon/vesafb
 - A nice hook to provide an IO "offset" for a given PCI bus for legacy
   accesses (which is allowed to fail if that bus cannot do it).
 - Same for VGA memory

Ben.

  reply	other threads:[~2007-05-15  0:06 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-05-14  7:53 [RFC/PATCH] powerpc: Rewrite IO allocation & mapping on powerpc64 Benjamin Herrenschmidt
2007-05-14  7:59 ` Benjamin Herrenschmidt
2007-05-14  8:03 ` Benjamin Herrenschmidt
2007-05-14  9:18 ` Benjamin Herrenschmidt
2007-05-14 13:50 ` Segher Boessenkool
2007-05-14 20:53   ` Benjamin Herrenschmidt
2007-05-15  0:17   ` Paul Mackerras
2007-05-15  4:33     ` Segher Boessenkool
2007-05-15  6:04       ` Benjamin Herrenschmidt
2007-05-14 14:37 ` Arnd Bergmann
2007-05-14 15:04   ` Segher Boessenkool
2007-05-14 23:56     ` Arnd Bergmann
2007-05-15  0:05       ` Olof Johansson
2007-05-14 20:59   ` Benjamin Herrenschmidt
2007-05-14 23:39     ` Arnd Bergmann
2007-05-15  0:06       ` Benjamin Herrenschmidt [this message]
2007-05-15 10:56 ` Christoph Hellwig
2007-05-15 20:42   ` Benjamin Herrenschmidt

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