Messages in this thread | | | From | Tim Blechmann <> | Subject | Re: [alsa-devel] [bisected] lx6464es fails to open a second time | Date | Tue, 22 Nov 2011 11:17:45 +0100 |
| |
> > today, i was able to bisect the issue and the first bad commit is: > > > > commit 6175ddf06b6172046a329e3abfd9c901a43efd2e > > Author: Brian Gerst <brgerst@gmail.com> > > Date: Fri Feb 5 09:37:07 2010 -0500 > > > > x86: Clean up mem*io functions. > > > > the communication with the device is done by passing simple commands via > > memcpy_fromio and memcpy_toio (compare sound/pci/lx6464es/lx_core.c, > > lines 75 to 99). any idea, what is going wrong there? > > The old and new implementations of memcpy_*io do not have any differences > in the documented API, but the new ones are much more optimized, so they > might not use 8- or 32-bit accesses or a different access pattern. > > Does the card's mapped I/O region behave exactly like memory, or has it > any restrictions on how it can be used? In the latter case, you should > implement your readbuf/writebuf functions by hand to use plain 32-bit > accesses in order (or whatever is required).
indeed, emulating memcpy_*io with ioread32/iowrite32 fixes the issue.
thanks, tim
| |