Re: [PATCH v2] drm/i915: Also perform gpu reset under execlist mode.

Chris Wilson
2015-07-07T12:10:42Z

On Tue, Jul 07, 2015 at 04:32:53AM +0800, Zhi Wang wrote:
> Thanks for the comments!:) I'm wondering that why the GEN>=5 is
> needed here. Is there any HW problems in GEN>=5 when driver wants to
> do GPU reset? I'm sorry that I don't know much about GEN<6...Just
> want to know more about the story:)

gen5 is about the earliest that I know the hw stated to get smart and
doing automatic power saving by writing to pinned buffers. Before gen5
our reset hasn't been very reliable, and only recently have we had code
that is meant to be able to reset the gpu on those gen - hence my
reservation about doing so unconditionally.
-Chris

--
Chris Wilson, Intel Open Source Technology Centre