[haiku-bugs] Re: [Haiku] #8588: Regression: Sound card doesn't work
- From: "anevilyak" <trac@xxxxxxxxxxxx>
- Date: Fri, 15 Jun 2012 02:44:03 -0000
#8588: Regression: Sound card doesn't work
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Reporter: drcouzelis | Owner: mmlr
Type: bug | Status: new
Priority: normal | Milestone: R1
Component: Drivers/USB | Version: R1/Development
Resolution: | Keywords: regression ohci interrupts
Blocked By: | Blocking:
Has a Patch: 1 | Platform: x86
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Comment (by anevilyak):
Replying to [comment:14 drcouzelis]:
> The comment for the original change says it "Shouldn't matter much but
maybe it helps on some chipsets to avoid interrupt storms during
handover". Was the code before hrev41513 actually causing problems? Or,
was this change only precautionary?
In short, yes. On some systems with a similar USB chipset, at the point of
handover (aka handing control of the USB controller from the BIOS to
Haiku), an interrupt storm (and consequently, system hang) would occur
unless interrupts were disabled in the correct order, which is what this
changeset was addressing. In your particular case this appears to have the
opposite effect so this is likely a case where chipset-specific quirks
will need to be used. It's unfortunately not quite as simple as reverting
it since that will simply break it again for other people.
--
Ticket URL: <http://dev.haiku-os.org/ticket/8588#comment:16>
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