Re: [PATCH 07/12] drm/i915/bdw: Set initial rps freq to RP0

Chris Wilson
2014-03-20T07:24:41Z

On Wed, Mar 19, 2014 at 06:31:14PM -0700, Ben Widawsky wrote:
> Programming it outside of the rp0-rp1 range is considered a programming
> error. Since we do not know that the previous value would actually be in
> the range, program something we've read from the hardware, and therefore
> know will work.
>
> This is potentially an issue for platforms whose ranges are outside the
> norms given in the programming guide (ie. early silicon)
>
> v2: Use RP1 instead of RPn
>
> Signed-off-by: Ben Widawsky <ben@bwidawsk.net>

Do you have a reference for GEN6_RC_VIDEO_FREQ? I still have no idea
what that controls, nor its valid range.
-Chris

--
Chris Wilson, Intel Open Source Technology Centre