[Intel-gfx] [PATCH 1/2] drm/i915/cnl: Reprogram DMC firmware after S3/S4 resume

[Imre Deak]

On Tue, Oct 03, 2017 at 10:40:18AM -0700, Rodrigo Vivi wrote:
> On Tue, Oct 03, 2017 at 09:51:58AM +0000, Imre Deak wrote:
> > The DMC firmware program memory is lost after S3/S4 system suspend, so
> > we need to reprogram it during resume.
> > 
> > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=103070
> > Fixes: cebfcead63de ("drm/i915/DMC/CNL: Load DMC on CNL")
> > Cc: Anusha Srivatsa <anusha.srivatsa at intel.com>
> > Cc: Animesh Manna <animesh.manna at intel.com>
> > Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
> > Signed-off-by: Imre Deak <imre.deak at intel.com>
> > ---
> >  drivers/gpu/drm/i915/intel_runtime_pm.c | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
> > index 7933d1bc6a1c..3791c3f5f56d 100644
> > --- a/drivers/gpu/drm/i915/intel_runtime_pm.c
> > +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
> > @@ -2809,6 +2809,9 @@ static void cnl_display_core_init(struct drm_i915_private *dev_priv, bool resume
> >  
> >  	/* 6. Enable DBUF */
> >  	gen9_dbuf_enable(dev_priv);
> > +
> > +	if (resume && dev_priv->csr.dmc_payload)
> > +		intel_csr_load_program(dev_priv);
> 
> If this is needed for all platforms, couldn't we move that to intel_power_domains_init_hw()?
> so we don't forget future platforms?

For GEN9_LP we also need to run the init sequence separately during
runtime resume, so these functions seem to be still the proper place to
call intel_csr_load_program().

> 
> >  }
> >  
> >  static void cnl_display_core_uninit(struct drm_i915_private *dev_priv)
> > -- 
> > 2.13.2
> >