[Intel-gfx] [PATCH v2 01/11] drm/i915: Disable PSR in Apple panels

[Dhinakaran Pandiyan]

On Fri, 2018-11-30 at 15:35 -0800, Dhinakaran Pandiyan wrote:
> On Thu, 2018-11-29 at 18:25 -0800, José Roberto de Souza wrote:
> > i915 yet don't support PSR in Apple panels, so lets keep it
> > disabled
> > while we work on that.
> > 
> > v2: Renamed DP_DPCD_QUIRK_PSR_NOT_CURRENTLY_SUPPORTED to
> > DP_DPCD_QUIRK_NO_PSR (Ville)
> > 
> > Fixes: 598c6cfe0690 (drm/i915/psr: Enable PSR1 on gen-9+ HW)
> > Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
> > Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
> > Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
> > ---
> >  drivers/gpu/drm/drm_dp_helper.c  | 2 ++
> >  drivers/gpu/drm/i915/intel_psr.c | 6 ++++++
> >  include/drm/drm_dp_helper.h      | 1 +
> >  3 files changed, 9 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/drm_dp_helper.c
> > b/drivers/gpu/drm/drm_dp_helper.c
> > index 2d6c491a0542..b00fd5ced0a0 100644
> > --- a/drivers/gpu/drm/drm_dp_helper.c
> > +++ b/drivers/gpu/drm/drm_dp_helper.c
> > @@ -1273,6 +1273,8 @@ static const struct dpcd_quirk
> > dpcd_quirk_list[] = {
> >  	{ OUI(0x00, 0x22, 0xb9), DEVICE_ID_ANY, true,
> > BIT(DP_DPCD_QUIRK_CONSTANT_N) },
> >  	/* LG LP140WF6-SPM1 eDP panel */
> >  	{ OUI(0x00, 0x22, 0xb9), DEVICE_ID('s', 'i', 'v', 'a', 'r',
> > 'T'), false, BIT(DP_DPCD_QUIRK_CONSTANT_N) },
> > +	/* Apple panels needs some additional handling to support PSR
> > */
> > +	{ OUI(0x00, 0x10, 0xfa), DEVICE_ID_ANY, false,
> > BIT(DP_DPCD_QUIRK_NO_PSR) }
> >  };
> >  
> >  #undef OUI
> > diff --git a/drivers/gpu/drm/i915/intel_psr.c
> > b/drivers/gpu/drm/i915/intel_psr.c
> > index 2084784f320d..40ca6cc43cc4 100644
> > --- a/drivers/gpu/drm/i915/intel_psr.c
> > +++ b/drivers/gpu/drm/i915/intel_psr.c
> > @@ -278,6 +278,12 @@ void intel_psr_init_dpcd(struct intel_dp
> > *intel_dp)
> >  		DRM_DEBUG_KMS("Panel lacks power state control, PSR
> > cannot be enabled\n");
> >  		return;
> >  	}
> > +
> > +	if (drm_dp_has_quirk(&intel_dp->desc, DP_DPCD_QUIRK_NO_PSR)) {
> > +		DRM_DEBUG_KMS("PSR support not currently available for
> > this panel\n");
> > +		return;
> > +	}
Another nitpick: While you make other changes, please also move this
above the power state check. Checking for power state control is not
very useful if we are never going to enable PSR on this panel.

> > +
> >  	dev_priv->psr.sink_support = true;
> >  	dev_priv->psr.sink_sync_latency =
> >  		intel_dp_get_sink_sync_latency(intel_dp);
> > diff --git a/include/drm/drm_dp_helper.h
> > b/include/drm/drm_dp_helper.h
> > index 5736c942c85b..047314ce25d6 100644
> > --- a/include/drm/drm_dp_helper.h
> > +++ b/include/drm/drm_dp_helper.h
> > @@ -1365,6 +1365,7 @@ enum drm_dp_quirk {
> >  	 * to 16 bits. So will give a constant value (0x8000) for
> > compatability.
> >  	 */
> >  	DP_DPCD_QUIRK_CONSTANT_N,
> 
> nit: Documentation missing here. I guess we need something along the
> lines of "PSR not supported" without referring to the specific DP
> device. With that,
> Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
> 
> 
> > +	DP_DPCD_QUIRK_NO_PSR,
> >  };
> >  
> >  /**