[Intel-gfx] pipe control notify removed?
michael_fu at linux.intel.com
Thu Dec 16 03:23:33 CET 2010
On 2010/12/16 9:59, Zhenyu Wang wrote:
> On 2010.12.15 10:05:01 +0000, Chris Wilson wrote:
>> On Wed, 15 Dec 2010 11:14:53 +0800, Zhenyu Wang<zhenyuw at linux.intel.com> wrote:
>>> Chris, just notice you removed pipe control notify entirely on -next,
>>> that seems wrong to me. In Ironlake time, we've seen interrupt stall issue
>>> with user interrupt, and be warned user interrupt is deprecated, so we moved
>>> on to use pipe control notify, although there's a workaround later covered
>>> that's required on Ironlake. But it's stable finally. And for sandybridge,
>>> there's no such workaround needed.
>> The answer to this is to make sure that such details are kept in the
>> code comments, especially if such information is not readily available
>> in the documentation.
> yeah, also our spec might not have been updated as well...I'll send the BUN
> doc for that to you.
I guess what Chris really want is to leave some comments in the code for
such workaround - BUN id isn't very useful to most people anyway. ;)
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