[Intel-gfx] [PATCH 1/5] drm/i915: Add RPS debugfs manual mode

[Chris Wilson]

On Tue, Feb 04, 2014 at 12:31:37PM +0100, Daniel Vetter wrote:
> On Fri, Jan 31, 2014 at 03:42:48PM -0600, jeff.mcgee at intel.com wrote:
> > From: Jeff McGee <jeff.mcgee at intel.com>
> > 
> > RPS manual mode disables/ignores load-based inputs and allows render
> > performance state to be controlled externally. The enabling of manual
> > mode and setting of desired frequency is done through debugfs.
> > 
> > i915_rps_manual:
> > '0' - RPS controlled normally using load metrics.
> > '1' - RPS controlled manually via i915_cur_freq writes.
> > 
> > i915_cur_freq:
> > u64 - Value is the current gpu frequency request in MHz. Writes
> >       accepted only if i915_rps_manual = 1.
> > 
> > Supports Gen6+ except Valleyview and Broadwell.
> > 
> > Signed-off-by: Jeff McGee <jeff.mcgee at intel.com>
> 
> Hm, can't we fake this by setting min/max to the same values?

This is one where we can reconfigure the hardware if explicitly set to
disabled. Or maybe we should just put the smarts in to detect min == max
and disable the interrupt generation (as opposed to just masking at the
various points along the path).
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre