[Intel-gfx] [PATCH 2/2] drm/i915/dp: TPS4 PHY test pattern compliance support

[Almahallawy, Khaled]

On Mon, 2020-07-20 at 17:11 -0700, Manasi Navare wrote:
> On Mon, Jul 20, 2020 at 04:41:26PM -0700, Khaled Almahallawy wrote:
> > Adding support for TPS4 (CP2520 Pattern 3) PHY pattern source
> > tests.
> > 
> > Signed-off-by: Khaled Almahallawy <khaled.almahallawy at intel.com>
> > ---
> >  drivers/gpu/drm/i915/display/intel_dp.c | 14 ++++++++++++--
> >  drivers/gpu/drm/i915/i915_reg.h         |  4 ++++
> >  2 files changed, 16 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/display/intel_dp.c
> > b/drivers/gpu/drm/i915/display/intel_dp.c
> > index d6295eb20b63..effadc096740 100644
> > --- a/drivers/gpu/drm/i915/display/intel_dp.c
> > +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> > @@ -5371,7 +5371,7 @@ static void
> > intel_dp_phy_pattern_update(struct intel_dp *intel_dp)
> >  			&intel_dp->compliance.test_data.phytest;
> >  	struct intel_crtc *crtc = to_intel_crtc(dig_port-
> > >base.base.crtc);
> >  	enum pipe pipe = crtc->pipe;
> > -	u32 pattern_val;
> > +	u32 pattern_val, dp_tp_ctl;
> >  
> >  	switch (data->phy_pattern) {
> >  	case DP_PHY_TEST_PATTERN_NONE:
> > @@ -5411,7 +5411,7 @@ static void
> > intel_dp_phy_pattern_update(struct intel_dp *intel_dp)
> >  			       DDI_DP_COMP_CTL_ENABLE |
> >  			       DDI_DP_COMP_CTL_CUSTOM80);
> >  		break;
> > -	case DP_PHY_TEST_PATTERN_CP2520:
> > +	case DP_PHY_TEST_PATTERN_CP2520_PAT1:
> >  		/*
> >  		 * FIXME: Ideally pattern should come from DPCD 0x24A.
> > As
> >  		 * current firmware of DPR-100 could not set it, so
> > hardcoding
> > @@ -5423,6 +5423,16 @@ static void
> > intel_dp_phy_pattern_update(struct intel_dp *intel_dp)
> >  			       DDI_DP_COMP_CTL_ENABLE |
> > DDI_DP_COMP_CTL_HBR2 |
> >  			       pattern_val);
> >  		break;
> > +		case DP_PHY_TEST_PATTERN_CP2520_PAT3:
> > +			DRM_DEBUG_KMS("Set TPS4 Phy Test Pattern\n");
> > +			intel_de_write(dev_priv, DDI_DP_COMP_CTL(pipe),
> > 0x0);
> > +			dp_tp_ctl = intel_de_read(dev_priv,
> > TGL_DP_TP_CTL(pipe));
> > +			dp_tp_ctl &= ~DP_TP_CTL_TRAIN_PAT4_SEL_MASK;
> > +			dp_tp_ctl |= DP_TP_CTL_TRAIN_PAT4_SEL_TS4a;
> > +			dp_tp_ctl &= ~DP_TP_CTL_LINK_TRAIN_MASK;
> > +			dp_tp_ctl |= DP_TP_CTL_LINK_TRAIN_PAT4;
> > +			intel_de_write(dev_priv, TGL_DP_TP_CTL(pipe),
> > dp_tp_ctl);
> > +			break;
> >  	default:
> >  		WARN(1, "Invalid Phy Test Pattern\n");
> >  	}
> > diff --git a/drivers/gpu/drm/i915/i915_reg.h
> > b/drivers/gpu/drm/i915/i915_reg.h
> > index a0d31f3bf634..a4607bd1ac26 100644
> > --- a/drivers/gpu/drm/i915/i915_reg.h
> > +++ b/drivers/gpu/drm/i915/i915_reg.h
> > @@ -9982,6 +9982,10 @@ enum skl_power_gate {
> >  #define  DP_TP_CTL_MODE_SST			(0 << 27)
> >  #define  DP_TP_CTL_MODE_MST			(1 << 27)
> >  #define  DP_TP_CTL_FORCE_ACT			(1 << 25)
> > +#define  DP_TP_CTL_TRAIN_PAT4_SEL_MASK		(3 << 19)
> > +#define  DP_TP_CTL_TRAIN_PAT4_SEL_TS4a		(0 << 19)
> > +#define  DP_TP_CTL_TRAIN_PAT4_SEL_TP4b		(1 << 19)
> > +#define  DP_TP_CTL_TRAIN_PAT4_SEL_TP4c		(2 << 19)
> 
> The bspec calls them Training Pattern 4a/b/c, why is it _TS4a. TP4b,
> TP4c?
> We shd make it uniform, all TP4a/b/c perhaps?

Apology,will fix to TP4a/b/c then

> 
> Manasi
> 
> >  #define  DP_TP_CTL_ENHANCED_FRAME_ENABLE	(1 << 18)
> >  #define  DP_TP_CTL_FDI_AUTOTRAIN		(1 << 15)
> >  #define  DP_TP_CTL_LINK_TRAIN_MASK		(7 << 8)
> > -- 
> > 2.17.1
> >