Re: [PATCH 10/16] drm/i915: Set scaler mode for NV12

["Srinivas, Vidya" <vidya.srinivas@intel.com>]

> -----Original Message-----
> From: Sharma, Shashank
> Sent: Thursday, February 8, 2018 2:35 PM
> To: Srinivas, Vidya <vidya.srinivas@intel.com>; intel-
> gfx@lists.freedesktop.org
> Cc: maarten.lankhorst@linux.intel.com; Kamath, Sunil
> <sunil.kamath@intel.com>; Shankar, Uma <uma.shankar@intel.com>;
> Konduru, Chandra <chandra.konduru@intel.com>; Maiti, Nabendu Bikash
> <nabendu.bikash.maiti@intel.com>
> Subject: Re: [PATCH 10/16] drm/i915: Set scaler mode for NV12
> 
> Regards
> 
> Shashank
> 
> 
> On 2/6/2018 6:28 PM, Vidya Srinivas wrote:
> > From: Chandra Konduru <chandra.konduru@intel.com>
> >
> > This patch sets appropriate scaler mode for NV12 format.
> > In this mode, skylake scaler does either chroma-upsampling or
> > chroma-upsampling and resolution scaling
> >
> > v2: Review comments from Ville addressed
> > NV12 case to be checked first for setting the scaler
> >
> > v3: Rebased (me)
> >
> > v4: Rebased (me)
> >
> > v5: Missed the Tested-by/Reviewed-by in the previous series Adding the
> > same to commit message in this version.
> >
> > v6: Rebased (me)
> >
> > v7: Rebased (me)
> >
> > v8: Rebased (me)
> > Restricting the NV12 change for scaler to BXT and KBL in this series.
> >
> > v9: Rebased (me)
> >
> > v10: As of now, NV12 has been tested on Gen9 and Gen10. However, code
> > is applicable to all GEN >= 9. Hence making that change to keep it
> > generic.
> I am not sure if the same code is applicable for all GEN > 9, I am seeing a
> different bit definition for GEN > 10 for bit 29:28
> > Comments under v8 is not valid anymore.
> >
> > Tested-by: Clinton Taylor <clinton.a.taylor@intel.com>
> > Reviewed-by: Clinton Taylor <clinton.a.taylor@intel.com>
> > Signed-off-by: Chandra Konduru <chandra.konduru@intel.com>
> > Signed-off-by: Nabendu Maiti <nabendu.bikash.maiti@intel.com>
> > Signed-off-by: Vidya Srinivas <vidya.srinivas@intel.com>
> > ---
> >   drivers/gpu/drm/i915/i915_reg.h     | 1 +
> >   drivers/gpu/drm/i915/intel_atomic.c | 8 ++++++--
> >   2 files changed, 7 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/i915_reg.h
> > b/drivers/gpu/drm/i915/i915_reg.h index e9c79b5..18be7be 100644
> > --- a/drivers/gpu/drm/i915/i915_reg.h
> > +++ b/drivers/gpu/drm/i915/i915_reg.h
> > @@ -6705,6 +6705,7 @@ enum {
> >   #define PS_SCALER_MODE_MASK (3 << 28)
> >   #define PS_SCALER_MODE_DYN  (0 << 28)
> >   #define PS_SCALER_MODE_HQ  (1 << 28)
> > +#define PS_SCALER_MODE_NV12 (2 << 28)
> >   #define PS_PLANE_SEL_MASK  (7 << 25)
> >   #define PS_PLANE_SEL(plane) (((plane) + 1) << 25)
> >   #define PS_FILTER_MASK         (3 << 23)
> > diff --git a/drivers/gpu/drm/i915/intel_atomic.c
> > b/drivers/gpu/drm/i915/intel_atomic.c
> > index d452c32..196427a 100644
> > --- a/drivers/gpu/drm/i915/intel_atomic.c
> > +++ b/drivers/gpu/drm/i915/intel_atomic.c
> > @@ -327,8 +327,12 @@ int intel_atomic_setup_scalers(struct
> drm_i915_private *dev_priv,
> >   		}
> >
> >   		/* set scaler mode */
> > -		if (IS_GEMINILAKE(dev_priv) || IS_CANNONLAKE(dev_priv))
> {
> > -			scaler_state->scalers[*scaler_id].mode = 0;
> > +		if ((INTEL_GEN(dev_priv) >= 9) &&
> Same here, this might not be applicable for (GEN > 10) due to different bit
> definition of 29:28.

Thank u. Will recheck and limit to Gen 9 and 10.

> > +			plane_state && plane_state->base.fb &&
> > +			plane_state->base.fb->format->format ==
> > +			DRM_FORMAT_NV12) {
> Above alignment should be aligned to first line (INTEL_GEN())
> > +			scaler_state->scalers[*scaler_id].mode =
> > +				PS_SCALER_MODE_NV12;
> >   		} else if (num_scalers_need == 1 && intel_crtc->pipe !=
> PIPE_C) {
> >   			/*
> >   			 * when only 1 scaler is in use on either pipe A or B,

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