[Intel-gfx] [PATCH v2 0/1] fbc on any plane

[Intel-gfx] [PATCH v2 0/1] fbc on any plane

[Vinod Govindapillai]

FBC can be supported in first three planes in lnl

Matt pointed out that FBC + PSR2 combination require few more condition
checks and also a WA also need to be impleteds. So patch to enabled FBC
in case of PSR2 is removed from this version.  Also per pizel alpha
condition is removed for FBC in LNL.

Vinod Govindapillai (1):
  drm/i915/lnl: possibility to enable FBC on first three planes

 drivers/gpu/drm/i915/display/intel_fbc.c           | 7 ++++++-
 drivers/gpu/drm/i915/display/skl_universal_plane.c | 5 ++++-
 drivers/gpu/drm/i915/i915_reg.h                    | 1 +
 3 files changed, 11 insertions(+), 2 deletions(-)

-- 
2.34.1

[Intel-gfx] [PATCH v2 1/1] drm/i915/lnl: possibility to enable FBC on first three planes

[Vinod Govindapillai]

In LNL onwards, FBC can be associated to the first three planes.
FBC will be enabled on planes first come first served basis
until the userspace can select one of these FBC capable plane
explicitly. FBC can be supported in planes with per pixel alpha

v2:
 - avoid fbc->state.plane check in intel_fbc_check_plane (Ville)
 - simplify plane binding register writes (Matt)
 - Update the subject to reflect that fbc can be enabled only in
   the first three planes (Matt)

Bspec: 69560
Signed-off-by: Vinod Govindapillai <vinod.govindapillai@intel.com>
---
 drivers/gpu/drm/i915/display/intel_fbc.c           | 7 ++++++-
 drivers/gpu/drm/i915/display/skl_universal_plane.c | 5 ++++-
 drivers/gpu/drm/i915/i915_reg.h                    | 1 +
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c
index 66c8aed07bbc..f1537bb63775 100644
--- a/drivers/gpu/drm/i915/display/intel_fbc.c
+++ b/drivers/gpu/drm/i915/display/intel_fbc.c
@@ -660,6 +660,10 @@ static u32 ivb_dpfc_ctl(struct intel_fbc *fbc)
 	if (IS_IVYBRIDGE(i915))
 		dpfc_ctl |= DPFC_CTL_PLANE_IVB(fbc_state->plane->i9xx_plane);
 
+	if (DISPLAY_VER(i915) >= 20)
+		dpfc_ctl |= REG_FIELD_PREP(DPFC_CTL_PLANE_BINDING_MASK,
+					   fbc_state->plane->id);
+
 	if (fbc_state->fence_id >= 0)
 		dpfc_ctl |= DPFC_CTL_FENCE_EN_IVB;
 
@@ -1206,7 +1210,8 @@ static int intel_fbc_check_plane(struct intel_atomic_state *state,
 		return 0;
 	}
 
-	if (plane_state->hw.pixel_blend_mode != DRM_MODE_BLEND_PIXEL_NONE &&
+	if (DISPLAY_VER(i915) < 20 &&
+	    plane_state->hw.pixel_blend_mode != DRM_MODE_BLEND_PIXEL_NONE &&
 	    fb->format->has_alpha) {
 		plane_state->no_fbc_reason = "per-pixel alpha not supported";
 		return 0;
diff --git a/drivers/gpu/drm/i915/display/skl_universal_plane.c b/drivers/gpu/drm/i915/display/skl_universal_plane.c
index 4d01c7ae4485..1291351c9941 100644
--- a/drivers/gpu/drm/i915/display/skl_universal_plane.c
+++ b/drivers/gpu/drm/i915/display/skl_universal_plane.c
@@ -1962,7 +1962,10 @@ static bool skl_plane_has_fbc(struct drm_i915_private *dev_priv,
 	if ((DISPLAY_RUNTIME_INFO(dev_priv)->fbc_mask & BIT(fbc_id)) == 0)
 		return false;
 
-	return plane_id == PLANE_PRIMARY;
+	if (DISPLAY_VER(dev_priv) >= 20)
+		return plane_id <= PLANE_SPRITE1;
+	else
+		return plane_id == PLANE_PRIMARY;
 }
 
 static struct intel_fbc *skl_plane_fbc(struct drm_i915_private *dev_priv,
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index aefad14ab27a..aadcc630cb52 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1327,6 +1327,7 @@
 #define   DPFC_CTL_PLANE_IVB(i9xx_plane)	REG_FIELD_PREP(DPFC_CTL_PLANE_MASK_IVB, (i9xx_plane))
 #define   DPFC_CTL_FENCE_EN_IVB			REG_BIT(28) /* ivb+ */
 #define   DPFC_CTL_PERSISTENT_MODE		REG_BIT(25) /* g4x-snb */
+#define   DPFC_CTL_PLANE_BINDING_MASK		REG_GENMASK(12, 11) /* lnl */
 #define   DPFC_CTL_FALSE_COLOR			REG_BIT(10) /* ivb+ */
 #define   DPFC_CTL_SR_EN			REG_BIT(10) /* g4x only */
 #define   DPFC_CTL_SR_EXIT_DIS			REG_BIT(9) /* g4x only */
-- 
2.34.1

[Intel-gfx] [PATCH v2 1/1] drm/i915/lnl: possibility to enable FBC on first three planes

[Vinod Govindapillai]

In LNL onwards, FBC can be associated to the first three planes.
FBC will be enabled on planes first come first served basis
until the userspace can select one of these FBC capable plane
explicitly. FBC can be supported in planes with per pixel alpha

v2:
 - avoid fbc->state.plane check in intel_fbc_check_plane (Ville)
 - simplify plane binding register writes (Matt)
 - Update the subject to reflect that fbc can be enabled only in
   the first three planes (Matt)

Bspec: 69560
Signed-off-by: Vinod Govindapillai <vinod.govindapillai@intel.com>
---
 drivers/gpu/drm/i915/display/intel_fbc.c           | 7 ++++++-
 drivers/gpu/drm/i915/display/skl_universal_plane.c | 5 ++++-
 drivers/gpu/drm/i915/i915_reg.h                    | 1 +
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c
index 66c8aed07bbc..f1537bb63775 100644
--- a/drivers/gpu/drm/i915/display/intel_fbc.c
+++ b/drivers/gpu/drm/i915/display/intel_fbc.c
@@ -660,6 +660,10 @@ static u32 ivb_dpfc_ctl(struct intel_fbc *fbc)
 	if (IS_IVYBRIDGE(i915))
 		dpfc_ctl |= DPFC_CTL_PLANE_IVB(fbc_state->plane->i9xx_plane);
 
+	if (DISPLAY_VER(i915) >= 20)
+		dpfc_ctl |= REG_FIELD_PREP(DPFC_CTL_PLANE_BINDING_MASK,
+					   fbc_state->plane->id);
+
 	if (fbc_state->fence_id >= 0)
 		dpfc_ctl |= DPFC_CTL_FENCE_EN_IVB;
 
@@ -1206,7 +1210,8 @@ static int intel_fbc_check_plane(struct intel_atomic_state *state,
 		return 0;
 	}
 
-	if (plane_state->hw.pixel_blend_mode != DRM_MODE_BLEND_PIXEL_NONE &&
+	if (DISPLAY_VER(i915) < 20 &&
+	    plane_state->hw.pixel_blend_mode != DRM_MODE_BLEND_PIXEL_NONE &&
 	    fb->format->has_alpha) {
 		plane_state->no_fbc_reason = "per-pixel alpha not supported";
 		return 0;
diff --git a/drivers/gpu/drm/i915/display/skl_universal_plane.c b/drivers/gpu/drm/i915/display/skl_universal_plane.c
index 4d01c7ae4485..1291351c9941 100644
--- a/drivers/gpu/drm/i915/display/skl_universal_plane.c
+++ b/drivers/gpu/drm/i915/display/skl_universal_plane.c
@@ -1962,7 +1962,10 @@ static bool skl_plane_has_fbc(struct drm_i915_private *dev_priv,
 	if ((DISPLAY_RUNTIME_INFO(dev_priv)->fbc_mask & BIT(fbc_id)) == 0)
 		return false;
 
-	return plane_id == PLANE_PRIMARY;
+	if (DISPLAY_VER(dev_priv) >= 20)
+		return plane_id <= PLANE_SPRITE1;
+	else
+		return plane_id == PLANE_PRIMARY;
 }
 
 static struct intel_fbc *skl_plane_fbc(struct drm_i915_private *dev_priv,
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index aefad14ab27a..aadcc630cb52 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1327,6 +1327,7 @@
 #define   DPFC_CTL_PLANE_IVB(i9xx_plane)	REG_FIELD_PREP(DPFC_CTL_PLANE_MASK_IVB, (i9xx_plane))
 #define   DPFC_CTL_FENCE_EN_IVB			REG_BIT(28) /* ivb+ */
 #define   DPFC_CTL_PERSISTENT_MODE		REG_BIT(25) /* g4x-snb */
+#define   DPFC_CTL_PLANE_BINDING_MASK		REG_GENMASK(12, 11) /* lnl */
 #define   DPFC_CTL_FALSE_COLOR			REG_BIT(10) /* ivb+ */
 #define   DPFC_CTL_SR_EN			REG_BIT(10) /* g4x only */
 #define   DPFC_CTL_SR_EXIT_DIS			REG_BIT(9) /* g4x only */
-- 
2.34.1

Re: [Intel-gfx] [PATCH v2 1/1] drm/i915/lnl: possibility to enable FBC on first three planes

[Ville Syrjälä]

On Fri, Sep 01, 2023 at 03:59:50PM +0300, Vinod Govindapillai wrote:
> In LNL onwards, FBC can be associated to the first three planes.
> FBC will be enabled on planes first come first served basis
> until the userspace can select one of these FBC capable plane
> explicitly. FBC can be supported in planes with per pixel alpha
> 
> v2:
>  - avoid fbc->state.plane check in intel_fbc_check_plane (Ville)
>  - simplify plane binding register writes (Matt)
>  - Update the subject to reflect that fbc can be enabled only in
>    the first three planes (Matt)
> 
> Bspec: 69560
> Signed-off-by: Vinod Govindapillai <vinod.govindapillai@intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_fbc.c           | 7 ++++++-
>  drivers/gpu/drm/i915/display/skl_universal_plane.c | 5 ++++-
>  drivers/gpu/drm/i915/i915_reg.h                    | 1 +
>  3 files changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c
> index 66c8aed07bbc..f1537bb63775 100644
> --- a/drivers/gpu/drm/i915/display/intel_fbc.c
> +++ b/drivers/gpu/drm/i915/display/intel_fbc.c
> @@ -660,6 +660,10 @@ static u32 ivb_dpfc_ctl(struct intel_fbc *fbc)
>  	if (IS_IVYBRIDGE(i915))
>  		dpfc_ctl |= DPFC_CTL_PLANE_IVB(fbc_state->plane->i9xx_plane);
>  
> +	if (DISPLAY_VER(i915) >= 20)
> +		dpfc_ctl |= REG_FIELD_PREP(DPFC_CTL_PLANE_BINDING_MASK,
> +					   fbc_state->plane->id);

Please add the customary wrapped macro for this.

We'll also need to deal with that annoying plane switching w/a.
Easiest might be to just write DPCF_CTL without the enable bit
in .program_cfb(). But that can be a separate patch for clarity.

> +
>  	if (fbc_state->fence_id >= 0)
>  		dpfc_ctl |= DPFC_CTL_FENCE_EN_IVB;
>  
> @@ -1206,7 +1210,8 @@ static int intel_fbc_check_plane(struct intel_atomic_state *state,
>  		return 0;
>  	}
>  
> -	if (plane_state->hw.pixel_blend_mode != DRM_MODE_BLEND_PIXEL_NONE &&
> +	if (DISPLAY_VER(i915) < 20 &&

One patch per logical change please.

> +	    plane_state->hw.pixel_blend_mode != DRM_MODE_BLEND_PIXEL_NONE &&
>  	    fb->format->has_alpha) {
>  		plane_state->no_fbc_reason = "per-pixel alpha not supported";
>  		return 0;
> diff --git a/drivers/gpu/drm/i915/display/skl_universal_plane.c b/drivers/gpu/drm/i915/display/skl_universal_plane.c
> index 4d01c7ae4485..1291351c9941 100644
> --- a/drivers/gpu/drm/i915/display/skl_universal_plane.c
> +++ b/drivers/gpu/drm/i915/display/skl_universal_plane.c
> @@ -1962,7 +1962,10 @@ static bool skl_plane_has_fbc(struct drm_i915_private *dev_priv,
>  	if ((DISPLAY_RUNTIME_INFO(dev_priv)->fbc_mask & BIT(fbc_id)) == 0)
>  		return false;
>  
> -	return plane_id == PLANE_PRIMARY;
> +	if (DISPLAY_VER(dev_priv) >= 20)
> +		return plane_id <= PLANE_SPRITE1;

I think we have some kind of is_hdr_plane() helper somewhere.
Probably should use that.

> +	else
> +		return plane_id == PLANE_PRIMARY;
>  }
>  
>  static struct intel_fbc *skl_plane_fbc(struct drm_i915_private *dev_priv,
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index aefad14ab27a..aadcc630cb52 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -1327,6 +1327,7 @@
>  #define   DPFC_CTL_PLANE_IVB(i9xx_plane)	REG_FIELD_PREP(DPFC_CTL_PLANE_MASK_IVB, (i9xx_plane))
>  #define   DPFC_CTL_FENCE_EN_IVB			REG_BIT(28) /* ivb+ */
>  #define   DPFC_CTL_PERSISTENT_MODE		REG_BIT(25) /* g4x-snb */
> +#define   DPFC_CTL_PLANE_BINDING_MASK		REG_GENMASK(12, 11) /* lnl */

Presumably lnl+

>  #define   DPFC_CTL_FALSE_COLOR			REG_BIT(10) /* ivb+ */
>  #define   DPFC_CTL_SR_EN			REG_BIT(10) /* g4x only */
>  #define   DPFC_CTL_SR_EXIT_DIS			REG_BIT(9) /* g4x only */
> -- 
> 2.34.1

-- 
Ville Syrjälä
Intel

Re: [Intel-gfx] [PATCH v2 1/1] drm/i915/lnl: possibility to enable FBC on first three planes

[Govindapillai, Vinod]

Thanks Ville. Updated the patch as per your comments.

About the WA, I am planning to send that as two separate patches one were we enabled FBC + PSR2
based on some conditions and the next one this WA

BR
Vinod

On Fri, 2023-09-01 at 16:10 +0300, Ville Syrjälä wrote:
> On Fri, Sep 01, 2023 at 03:59:50PM +0300, Vinod Govindapillai wrote:
> > In LNL onwards, FBC can be associated to the first three planes.
> > FBC will be enabled on planes first come first served basis
> > until the userspace can select one of these FBC capable plane
> > explicitly. FBC can be supported in planes with per pixel alpha
> > 
> > v2:
> >  - avoid fbc->state.plane check in intel_fbc_check_plane (Ville)
> >  - simplify plane binding register writes (Matt)
> >  - Update the subject to reflect that fbc can be enabled only in
> >    the first three planes (Matt)
> > 
> > Bspec: 69560
> > Signed-off-by: Vinod Govindapillai <vinod.govindapillai@intel.com>
> > ---
> >  drivers/gpu/drm/i915/display/intel_fbc.c           | 7 ++++++-
> >  drivers/gpu/drm/i915/display/skl_universal_plane.c | 5 ++++-
> >  drivers/gpu/drm/i915/i915_reg.h                    | 1 +
> >  3 files changed, 11 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c
> > index 66c8aed07bbc..f1537bb63775 100644
> > --- a/drivers/gpu/drm/i915/display/intel_fbc.c
> > +++ b/drivers/gpu/drm/i915/display/intel_fbc.c
> > @@ -660,6 +660,10 @@ static u32 ivb_dpfc_ctl(struct intel_fbc *fbc)
> >         if (IS_IVYBRIDGE(i915))
> >                 dpfc_ctl |= DPFC_CTL_PLANE_IVB(fbc_state->plane->i9xx_plane);
> >  
> > +       if (DISPLAY_VER(i915) >= 20)
> > +               dpfc_ctl |= REG_FIELD_PREP(DPFC_CTL_PLANE_BINDING_MASK,
> > +                                          fbc_state->plane->id);
> 
> Please add the customary wrapped macro for this.
> 
> We'll also need to deal with that annoying plane switching w/a.
> Easiest might be to just write DPCF_CTL without the enable bit
> in .program_cfb(). But that can be a separate patch for clarity.
> 
> > +
> >         if (fbc_state->fence_id >= 0)
> >                 dpfc_ctl |= DPFC_CTL_FENCE_EN_IVB;
> >  
> > @@ -1206,7 +1210,8 @@ static int intel_fbc_check_plane(struct intel_atomic_state *state,
> >                 return 0;
> >         }
> >  
> > -       if (plane_state->hw.pixel_blend_mode != DRM_MODE_BLEND_PIXEL_NONE &&
> > +       if (DISPLAY_VER(i915) < 20 &&
> 
> One patch per logical change please.
> 
> > +           plane_state->hw.pixel_blend_mode != DRM_MODE_BLEND_PIXEL_NONE &&
> >             fb->format->has_alpha) {
> >                 plane_state->no_fbc_reason = "per-pixel alpha not supported";
> >                 return 0;
> > diff --git a/drivers/gpu/drm/i915/display/skl_universal_plane.c
> > b/drivers/gpu/drm/i915/display/skl_universal_plane.c
> > index 4d01c7ae4485..1291351c9941 100644
> > --- a/drivers/gpu/drm/i915/display/skl_universal_plane.c
> > +++ b/drivers/gpu/drm/i915/display/skl_universal_plane.c
> > @@ -1962,7 +1962,10 @@ static bool skl_plane_has_fbc(struct drm_i915_private *dev_priv,
> >         if ((DISPLAY_RUNTIME_INFO(dev_priv)->fbc_mask & BIT(fbc_id)) == 0)
> >                 return false;
> >  
> > -       return plane_id == PLANE_PRIMARY;
> > +       if (DISPLAY_VER(dev_priv) >= 20)
> > +               return plane_id <= PLANE_SPRITE1;
> 
> I think we have some kind of is_hdr_plane() helper somewhere.
> Probably should use that.
> 
> > +       else
> > +               return plane_id == PLANE_PRIMARY;
> >  }
> >  
> >  static struct intel_fbc *skl_plane_fbc(struct drm_i915_private *dev_priv,
> > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> > index aefad14ab27a..aadcc630cb52 100644
> > --- a/drivers/gpu/drm/i915/i915_reg.h
> > +++ b/drivers/gpu/drm/i915/i915_reg.h
> > @@ -1327,6 +1327,7 @@
> >  #define   DPFC_CTL_PLANE_IVB(i9xx_plane)       REG_FIELD_PREP(DPFC_CTL_PLANE_MASK_IVB,
> > (i9xx_plane))
> >  #define   DPFC_CTL_FENCE_EN_IVB                        REG_BIT(28) /* ivb+ */
> >  #define   DPFC_CTL_PERSISTENT_MODE             REG_BIT(25) /* g4x-snb */
> > +#define   DPFC_CTL_PLANE_BINDING_MASK          REG_GENMASK(12, 11) /* lnl */
> 
> Presumably lnl+
> 
> >  #define   DPFC_CTL_FALSE_COLOR                 REG_BIT(10) /* ivb+ */
> >  #define   DPFC_CTL_SR_EN                       REG_BIT(10) /* g4x only */
> >  #define   DPFC_CTL_SR_EXIT_DIS                 REG_BIT(9) /* g4x only */
> > -- 
> > 2.34.1
>