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| H A D | ahci.c | diff 453d3131ec7aab82eaaa8401a50522a337092aa8 Tue Jan 26 22:33:23 CST 2010 Robert Hancock <hancockrwd@gmail.com> ahci: disable FPDMA auto-activate optimization on NVIDIA AHCI
Mike Cui reported that his system with an NVIDIA MCP79 (aka MCP7A)
chipset stopped working with 2.6.32. The problem appears to be that
2.6.32 now enables the FPDMA auto-activate optimization in the ahci
driver. The drive works fine with this enabled on an Intel AHCI so
this appears to be a chipset bug. Since MCP79 is a fairly recent
NVIDIA chipset and we don't have any info on whether any other NVIDIA
chipsets have this issue, disable FPDMA AA optimization on all NVIDIA
AHCI controllers for now.
Should address http://bugzilla.kernel.org/show_bug.cgi?id=14922
Signed-off-by: Robert Hancock <hancockrwd@gmail.com>
While-we-investigate-issue-this-patch-looks-good-to-me-by:
Prajakta Gudadhe <pgudadhe@nvidia.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Cc: stable@kernel.org
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