[PATCH 0/6] drm/i915: Remaining PSR fixes

[Daniel Vetter]

On Tue, May 31, 2016 at 06:50:24PM +0300, ville.syrjala at linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> Here's a repost of my PSR fixes, and one straggler from Daniel.
> 
> One interesting thing I noticed is that my SKL actually hits the PSR setup
> time vs. vblank length check, so after these patches that machine won't
> actually use PSR. The panel does support a lower refresh rate timing as well
> though which doesn't suffer from this limitation, so I hacked the code to
> use that mode instead, and PSR did seem to work without problems. With the
> original mode I had some screen stalls while running xonotic, which I'm
> going to assume were due to the setup time exceeding the safe limit.

Hm, is there a way to make that hack less hackish and merge it? Selecting
a mode with slightly different timings (but same resolution ofc) to make
PSR possible seems like a very sensible idea. Or is this a 60Hz vs 30Hz
kind of thing?

Scrolled through patches, still lgtm.
-Daniel

> 
> I also hooked up the PSR interrupts for BDW+ and pushed the patches to [1],
> but I'm not including those patches here since the PSR interrupts don't
> seem to gain us anything useful in practice.
> 
> [1] git://github.com/vsyrjala/linux.git psr_interrupts
> 
> Daniel Vetter (1):
>   drm/i915/psr: Skip aux handeshake if the vbt tells us to
> 
> Ville Syrjälä (5):
>   drm/dp: Add drm_dp_psr_setup_time()
>   drm/dp: Add drm_dp_psr_need_train_on_exit()
>   drm/i915: Check PSR setup time vs. vblank length
>   drm/i915: Ask the sink whether training is required when exiting PSR
>     main-link off mode
>   drm/i915: Move psr.link_standby setup to intel_psr_match_conditions()
> 
>  drivers/gpu/drm/drm_dp_helper.c     | 46 ++++++++++++++++++++++++++
>  drivers/gpu/drm/i915/intel_drv.h    |  2 ++
>  drivers/gpu/drm/i915/intel_psr.c    | 64 +++++++++++++++++++++++++------------
>  drivers/gpu/drm/i915/intel_sprite.c |  6 ++--
>  include/drm/drm_dp_helper.h         |  3 ++
>  5 files changed, 97 insertions(+), 24 deletions(-)
> 
> -- 
> 2.7.4
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch