[Intel-gfx] [PATCH] drm/i915/display: Program DBUF_CTL tracker state service

[Souza, Jose]

On Mon, 2020-10-19 at 08:31 -0700, Matt Roper wrote:
> On Fri, Oct 16, 2020 at 01:18:37PM -0700, José Roberto de Souza wrote:
> > This sequence is not part of "Sequences to Initialize Display" but
> > as noted in the MBus page the DBUF_CTL.Tracker_state_service needs
> > to be set to 8.
> > 
> > BSpec: 49213
> > Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
> > ---
> >  drivers/gpu/drm/i915/display/intel_display_power.c | 13 +++++++++++++
> >  drivers/gpu/drm/i915/i915_reg.h                    | 14 +++++++++-----
> >  2 files changed, 22 insertions(+), 5 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c b/drivers/gpu/drm/i915/display/intel_display_power.c
> > index 45806cfc679a..db36ab02e7d7 100644
> > --- a/drivers/gpu/drm/i915/display/intel_display_power.c
> > +++ b/drivers/gpu/drm/i915/display/intel_display_power.c
> > @@ -4771,6 +4771,17 @@ static void gen9_dbuf_disable(struct drm_i915_private *dev_priv)
> >  	gen9_dbuf_slices_update(dev_priv, 0);
> >  }
> >  
> > 
> > 
> > 
> > +static void gen12_dbuf_slices_config(struct drm_i915_private *dev_priv)
> > +{
> > +	const int num_slices = INTEL_INFO(dev_priv)->num_supported_dbuf_slices;
> > +	enum dbuf_slice slice;
> > +
> > +	for (slice = DBUF_S1; slice < num_slices; slice++)
> 
> Minor nitpick; if we're starting from symbolic value DBUF_S1, we should
> probably end at 'DBUF_S1 + num_slices' for consistency.

Current user of num_supported_dbuf_slices don't do that but anyways looks a good idea.

> 
> > +		intel_de_rmw(dev_priv, DBUF_CTL_S(slice),
> > +			     DBUF_TRACKER_STATE_SERVICE_MASK,
> > +			     DBUF_TRACKER_STATE_SERVICE(8));
> > +}
> > +
> >  static void icl_mbus_init(struct drm_i915_private *dev_priv)
> >  {
> >  	unsigned long abox_regs = INTEL_INFO(dev_priv)->abox_mask;
> > @@ -5340,6 +5351,8 @@ static void icl_display_core_init(struct drm_i915_private *dev_priv,
> >  	/* 4. Enable CDCLK. */
> >  	intel_cdclk_init_hw(dev_priv);
> >  
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > +	if (INTEL_GEN(dev_priv) >= 12)
> > +		gen12_dbuf_slices_config(dev_priv);
> >  	/* 5. Enable DBUF. */
> 
> Minor nitpick: should there be a blank between these additions and the
> comment?

sure.

> 
> Aside from those two minor things,
> 
> Reviewed-by: Matt Roper <matthew.d.roper at intel.com>

thanks

> 
> >  	gen9_dbuf_enable(dev_priv);
> >  
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> > index 6d97e6286c2d..c38901e2f81c 100644
> > --- a/drivers/gpu/drm/i915/i915_reg.h
> > +++ b/drivers/gpu/drm/i915/i915_reg.h
> > @@ -7927,11 +7927,15 @@ enum {
> >  #define DISP_ARB_CTL2	_MMIO(0x45004)
> >  #define  DISP_DATA_PARTITION_5_6	(1 << 6)
> >  #define  DISP_IPC_ENABLE		(1 << 3)
> > -#define _DBUF_CTL_S1			0x45008
> > -#define _DBUF_CTL_S2			0x44FE8
> > -#define DBUF_CTL_S(slice)		_MMIO(_PICK_EVEN(slice, _DBUF_CTL_S1, _DBUF_CTL_S2))
> > -#define  DBUF_POWER_REQUEST		(1 << 31)
> > -#define  DBUF_POWER_STATE		(1 << 30)
> > +
> > +#define _DBUF_CTL_S1				0x45008
> > +#define _DBUF_CTL_S2				0x44FE8
> > +#define DBUF_CTL_S(slice)			_MMIO(_PICK_EVEN(slice, _DBUF_CTL_S1, _DBUF_CTL_S2))
> > +#define  DBUF_POWER_REQUEST			REG_BIT(31)
> > +#define  DBUF_POWER_STATE			REG_BIT(30)
> > +#define  DBUF_TRACKER_STATE_SERVICE_MASK	REG_GENMASK(23, 19)
> > +#define  DBUF_TRACKER_STATE_SERVICE(x)		REG_FIELD_PREP(DBUF_TRACKER_STATE_SERVICE_MASK, x)
> > +
> >  #define GEN7_MSG_CTL	_MMIO(0x45010)
> >  #define  WAIT_FOR_PCH_RESET_ACK		(1 << 1)
> >  #define  WAIT_FOR_PCH_FLR_ACK		(1 << 0)
> > -- 
> > 2.28.0
> > 
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>