drm/msm/dpu: Support quad pipe with dual-DSI

[PATCH v2 14/14] drm/msm/dpu: Enable quad-pipe for DSC and dual-DSI case

Posted by Jun Nie 1 month, 2 weeks ago

Request 4 mixers and 4 DSC for the case that both dual-DSI and DSC are
enabled. We prefer to use 4 pipes for dual DSI case for it is power optimal
for DSC.

Signed-off-by: Jun Nie <jun.nie@linaro.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c         |  2 +-
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h         |  6 ++---
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c      | 29 ++++++++++++++++++------
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h |  3 ++-
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h   |  1 +
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h      |  2 +-
 6 files changed, 30 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index d2aca0a9493d5..dbdfff1c7792a 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -200,7 +200,7 @@ static int dpu_crtc_get_lm_crc(struct drm_crtc *crtc,
 		struct dpu_crtc_state *crtc_state)
 {
 	struct dpu_crtc_mixer *m;
-	u32 crcs[CRTC_DUAL_MIXERS];
+	u32 crcs[CRTC_QUAD_MIXERS];
 
 	int rc = 0;
 	int i;
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
index ee7cf71f89fc7..f8276afd99192 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
@@ -211,7 +211,7 @@ struct dpu_crtc_state {
 
 	bool bw_control;
 	bool bw_split_vote;
-	struct drm_rect lm_bounds[CRTC_DUAL_MIXERS];
+	struct drm_rect lm_bounds[CRTC_QUAD_MIXERS];
 
 	uint64_t input_fence_timeout_ns;
 
@@ -219,10 +219,10 @@ struct dpu_crtc_state {
 
 	/* HW Resources reserved for the crtc */
 	u32 num_mixers;
-	struct dpu_crtc_mixer mixers[CRTC_DUAL_MIXERS];
+	struct dpu_crtc_mixer mixers[CRTC_QUAD_MIXERS];
 
 	u32 num_ctls;
-	struct dpu_hw_ctl *hw_ctls[CRTC_DUAL_MIXERS];
+	struct dpu_hw_ctl *hw_ctls[CRTC_QUAD_MIXERS];
 
 	u32 num_dscs;
 	enum dpu_crtc_crc_source crc_source;
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index 68655c8817bf8..ed220ac691e8a 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -54,7 +54,7 @@
 #define MAX_PHYS_ENCODERS_PER_VIRTUAL \
 	(MAX_H_TILES_PER_DISPLAY * NUM_PHYS_ENCODER_TYPES)
 
-#define MAX_CHANNELS_PER_ENC 2
+#define MAX_CHANNELS_PER_ENC 4
 
 #define IDLE_SHORT_TIMEOUT	1
 
@@ -588,15 +588,19 @@ static struct msm_display_topology dpu_encoder_get_topology(
 
 	/* Datapath topology selection
 	 *
-	 * Dual display
+	 * Dual display without DSC
 	 * 2 LM, 2 INTF ( Split display using 2 interfaces)
 	 *
+	 * Dual display with DSC
+	 * 4 LM, 2 INTF ( Split display using 2 interfaces)
+	 *
 	 * Single display
 	 * 1 LM, 1 INTF
 	 * 2 LM, 1 INTF (stream merge to support high resolution interfaces)
 	 *
 	 * Add dspps to the reservation requirements if ctm is requested
 	 */
+
 	if (intf_count == 2)
 		topology.num_lm = 2;
 	else if (!dpu_kms->catalog->caps->has_3d_merge)
@@ -615,10 +619,21 @@ static struct msm_display_topology dpu_encoder_get_topology(
 		 * 2 DSC encoders, 2 layer mixers and 1 interface
 		 * this is power optimal and can drive up to (including) 4k
 		 * screens
+		 * But for dual display case, we prefer 4 layer mixers. Because
+		 * the resolution is always high in the case and 4 DSCs are more
+		 * power optimal. While a single SSPP can only co-work with one
+		 * mixer pair. So 4 mixers are needed in this case.
 		 */
-		topology.num_dsc = 2;
-		topology.num_lm = 2;
-		topology.num_intf = 1;
+
+		if (intf_count == 2) {
+			topology.num_dsc = 4;
+			topology.num_lm = 4;
+			topology.num_intf = 2;
+		} else {
+			topology.num_dsc = 2;
+			topology.num_lm = 2;
+			topology.num_intf = 1;
+		}
 	}
 
 	return topology;
@@ -2031,8 +2046,8 @@ static void dpu_encoder_helper_reset_mixers(struct dpu_encoder_phys *phys_enc)
 	struct dpu_hw_mixer_cfg mixer;
 	int i, num_lm;
 	struct dpu_global_state *global_state;
-	struct dpu_hw_blk *hw_lm[2];
-	struct dpu_hw_mixer *hw_mixer[2];
+	struct dpu_hw_blk *hw_lm[MAX_CHANNELS_PER_ENC];
+	struct dpu_hw_mixer *hw_mixer[MAX_CHANNELS_PER_ENC];
 	struct dpu_hw_ctl *ctl = phys_enc->hw_ctl;
 
 	memset(&mixer, 0, sizeof(mixer));
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
index e77ebe3a68da9..c877ee45535ac 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
@@ -324,7 +324,8 @@ static inline enum dpu_3d_blend_mode dpu_encoder_helper_get_3d_blend_mode(
 
 	/* Use merge_3d unless DSC MERGE topology is used */
 	if (phys_enc->split_role == ENC_ROLE_SOLO &&
-	    dpu_cstate->num_mixers == CRTC_DUAL_MIXERS &&
+	    (dpu_cstate->num_mixers == CRTC_DUAL_MIXERS ||
+		dpu_cstate->num_mixers == CRTC_QUAD_MIXERS) &&
 	    !dpu_encoder_use_dsc_merge(phys_enc->parent))
 		return BLEND_3D_H_ROW_INT;
 
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
index bf86d643887dd..f79ecd409a830 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
@@ -25,6 +25,7 @@
 #define MAX_IMG_HEIGHT 0x3fff
 
 #define CRTC_DUAL_MIXERS	2
+#define CRTC_QUAD_MIXERS	4
 
 #define MAX_XIN_COUNT 16
 
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
index d8f5cffa60ea6..671e03406df74 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
@@ -32,9 +32,9 @@
 #define DPU_MAX_PLANES			4
 #endif
 
-#define PIPES_PER_PLANE			2
 #define PIPES_PER_LM_PAIR		2
 #define LM_PAIRS_PER_PLANE		2
+#define PIPES_PER_PLANE			(PIPES_PER_LM_PAIR * LM_PAIRS_PER_PLANE)
 #ifndef DPU_MAX_DE_CURVES
 #define DPU_MAX_DE_CURVES		3
 #endif

-- 
2.34.1

Re: [PATCH v2 14/14] drm/msm/dpu: Enable quad-pipe for DSC and dual-DSI case

Posted by Dmitry Baryshkov 1 month, 2 weeks ago

On Wed, Oct 09, 2024 at 04:50:27PM GMT, Jun Nie wrote:
> Request 4 mixers and 4 DSC for the case that both dual-DSI and DSC are
> enabled. We prefer to use 4 pipes for dual DSI case for it is power optimal
> for DSC.
> 
> Signed-off-by: Jun Nie <jun.nie@linaro.org>
> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c         |  2 +-
>  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h         |  6 ++---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c      | 29 ++++++++++++++++++------
>  drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h |  3 ++-
>  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h   |  1 +
>  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h      |  2 +-
>  6 files changed, 30 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> index d2aca0a9493d5..dbdfff1c7792a 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> @@ -200,7 +200,7 @@ static int dpu_crtc_get_lm_crc(struct drm_crtc *crtc,
>  		struct dpu_crtc_state *crtc_state)
>  {
>  	struct dpu_crtc_mixer *m;
> -	u32 crcs[CRTC_DUAL_MIXERS];
> +	u32 crcs[CRTC_QUAD_MIXERS];
>  
>  	int rc = 0;
>  	int i;
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
> index ee7cf71f89fc7..f8276afd99192 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
> @@ -211,7 +211,7 @@ struct dpu_crtc_state {
>  
>  	bool bw_control;
>  	bool bw_split_vote;
> -	struct drm_rect lm_bounds[CRTC_DUAL_MIXERS];
> +	struct drm_rect lm_bounds[CRTC_QUAD_MIXERS];
>  
>  	uint64_t input_fence_timeout_ns;
>  
> @@ -219,10 +219,10 @@ struct dpu_crtc_state {
>  
>  	/* HW Resources reserved for the crtc */
>  	u32 num_mixers;
> -	struct dpu_crtc_mixer mixers[CRTC_DUAL_MIXERS];
> +	struct dpu_crtc_mixer mixers[CRTC_QUAD_MIXERS];
>  
>  	u32 num_ctls;
> -	struct dpu_hw_ctl *hw_ctls[CRTC_DUAL_MIXERS];
> +	struct dpu_hw_ctl *hw_ctls[CRTC_QUAD_MIXERS];
>  
>  	u32 num_dscs;
>  	enum dpu_crtc_crc_source crc_source;
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> index 68655c8817bf8..ed220ac691e8a 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> @@ -54,7 +54,7 @@
>  #define MAX_PHYS_ENCODERS_PER_VIRTUAL \
>  	(MAX_H_TILES_PER_DISPLAY * NUM_PHYS_ENCODER_TYPES)
>  
> -#define MAX_CHANNELS_PER_ENC 2
> +#define MAX_CHANNELS_PER_ENC 4
>  
>  #define IDLE_SHORT_TIMEOUT	1
>  
> @@ -588,15 +588,19 @@ static struct msm_display_topology dpu_encoder_get_topology(
>  
>  	/* Datapath topology selection
>  	 *
> -	 * Dual display
> +	 * Dual display without DSC
>  	 * 2 LM, 2 INTF ( Split display using 2 interfaces)
>  	 *
> +	 * Dual display with DSC
> +	 * 4 LM, 2 INTF ( Split display using 2 interfaces)
> +	 *
>  	 * Single display
>  	 * 1 LM, 1 INTF
>  	 * 2 LM, 1 INTF (stream merge to support high resolution interfaces)
>  	 *
>  	 * Add dspps to the reservation requirements if ctm is requested
>  	 */
> +
>  	if (intf_count == 2)
>  		topology.num_lm = 2;
>  	else if (!dpu_kms->catalog->caps->has_3d_merge)
> @@ -615,10 +619,21 @@ static struct msm_display_topology dpu_encoder_get_topology(
>  		 * 2 DSC encoders, 2 layer mixers and 1 interface
>  		 * this is power optimal and can drive up to (including) 4k
>  		 * screens
> +		 * But for dual display case, we prefer 4 layer mixers. Because
> +		 * the resolution is always high in the case and 4 DSCs are more
> +		 * power optimal. While a single SSPP can only co-work with one
> +		 * mixer pair. So 4 mixers are needed in this case.

What is the relationship between SSPP working with a mixer pair and
high-res using 4 mixers? You have been writing about DSC, then you
suddently mention SSPP.

>  		 */
> -		topology.num_dsc = 2;
> -		topology.num_lm = 2;
> -		topology.num_intf = 1;
> +
> +		if (intf_count == 2) {
> +			topology.num_dsc = 4;
> +			topology.num_lm = 4;
> +			topology.num_intf = 2;
> +		} else {
> +			topology.num_dsc = 2;
> +			topology.num_lm = 2;
> +			topology.num_intf = 1;
> +		}
>  	}
>  
>  	return topology;
> @@ -2031,8 +2046,8 @@ static void dpu_encoder_helper_reset_mixers(struct dpu_encoder_phys *phys_enc)
>  	struct dpu_hw_mixer_cfg mixer;
>  	int i, num_lm;
>  	struct dpu_global_state *global_state;
> -	struct dpu_hw_blk *hw_lm[2];
> -	struct dpu_hw_mixer *hw_mixer[2];
> +	struct dpu_hw_blk *hw_lm[MAX_CHANNELS_PER_ENC];
> +	struct dpu_hw_mixer *hw_mixer[MAX_CHANNELS_PER_ENC];
>  	struct dpu_hw_ctl *ctl = phys_enc->hw_ctl;
>  
>  	memset(&mixer, 0, sizeof(mixer));
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
> index e77ebe3a68da9..c877ee45535ac 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
> @@ -324,7 +324,8 @@ static inline enum dpu_3d_blend_mode dpu_encoder_helper_get_3d_blend_mode(
>  
>  	/* Use merge_3d unless DSC MERGE topology is used */
>  	if (phys_enc->split_role == ENC_ROLE_SOLO &&
> -	    dpu_cstate->num_mixers == CRTC_DUAL_MIXERS &&
> +	    (dpu_cstate->num_mixers == CRTC_DUAL_MIXERS ||
> +		dpu_cstate->num_mixers == CRTC_QUAD_MIXERS) &&
>  	    !dpu_encoder_use_dsc_merge(phys_enc->parent))
>  		return BLEND_3D_H_ROW_INT;
>  
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
> index bf86d643887dd..f79ecd409a830 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
> @@ -25,6 +25,7 @@
>  #define MAX_IMG_HEIGHT 0x3fff
>  
>  #define CRTC_DUAL_MIXERS	2
> +#define CRTC_QUAD_MIXERS	4
>  
>  #define MAX_XIN_COUNT 16
>  
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
> index d8f5cffa60ea6..671e03406df74 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
> @@ -32,9 +32,9 @@
>  #define DPU_MAX_PLANES			4
>  #endif
>  
> -#define PIPES_PER_PLANE			2
>  #define PIPES_PER_LM_PAIR		2
>  #define LM_PAIRS_PER_PLANE		2
> +#define PIPES_PER_PLANE			(PIPES_PER_LM_PAIR * LM_PAIRS_PER_PLANE)
>  #ifndef DPU_MAX_DE_CURVES
>  #define DPU_MAX_DE_CURVES		3
>  #endif
> 
> -- 
> 2.34.1
> 

-- 
With best wishes
Dmitry

Re: [PATCH v2 14/14] drm/msm/dpu: Enable quad-pipe for DSC and dual-DSI case

Posted by Jun Nie 1 month, 2 weeks ago

Dmitry Baryshkov <dmitry.baryshkov@linaro.org> 于2024年10月10日周四 22:00写道：
>
> On Wed, Oct 09, 2024 at 04:50:27PM GMT, Jun Nie wrote:
> > Request 4 mixers and 4 DSC for the case that both dual-DSI and DSC are
> > enabled. We prefer to use 4 pipes for dual DSI case for it is power optimal
> > for DSC.
> >
> > Signed-off-by: Jun Nie <jun.nie@linaro.org>
> > ---
> >  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c         |  2 +-
> >  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h         |  6 ++---
> >  drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c      | 29 ++++++++++++++++++------
> >  drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h |  3 ++-
> >  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h   |  1 +
> >  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h      |  2 +-
> >  6 files changed, 30 insertions(+), 13 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> > index d2aca0a9493d5..dbdfff1c7792a 100644
> > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> > @@ -200,7 +200,7 @@ static int dpu_crtc_get_lm_crc(struct drm_crtc *crtc,
> >               struct dpu_crtc_state *crtc_state)
> >  {
> >       struct dpu_crtc_mixer *m;
> > -     u32 crcs[CRTC_DUAL_MIXERS];
> > +     u32 crcs[CRTC_QUAD_MIXERS];
> >
> >       int rc = 0;
> >       int i;
> > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
> > index ee7cf71f89fc7..f8276afd99192 100644
> > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
> > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
> > @@ -211,7 +211,7 @@ struct dpu_crtc_state {
> >
> >       bool bw_control;
> >       bool bw_split_vote;
> > -     struct drm_rect lm_bounds[CRTC_DUAL_MIXERS];
> > +     struct drm_rect lm_bounds[CRTC_QUAD_MIXERS];
> >
> >       uint64_t input_fence_timeout_ns;
> >
> > @@ -219,10 +219,10 @@ struct dpu_crtc_state {
> >
> >       /* HW Resources reserved for the crtc */
> >       u32 num_mixers;
> > -     struct dpu_crtc_mixer mixers[CRTC_DUAL_MIXERS];
> > +     struct dpu_crtc_mixer mixers[CRTC_QUAD_MIXERS];
> >
> >       u32 num_ctls;
> > -     struct dpu_hw_ctl *hw_ctls[CRTC_DUAL_MIXERS];
> > +     struct dpu_hw_ctl *hw_ctls[CRTC_QUAD_MIXERS];
> >
> >       u32 num_dscs;
> >       enum dpu_crtc_crc_source crc_source;
> > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> > index 68655c8817bf8..ed220ac691e8a 100644
> > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> > @@ -54,7 +54,7 @@
> >  #define MAX_PHYS_ENCODERS_PER_VIRTUAL \
> >       (MAX_H_TILES_PER_DISPLAY * NUM_PHYS_ENCODER_TYPES)
> >
> > -#define MAX_CHANNELS_PER_ENC 2
> > +#define MAX_CHANNELS_PER_ENC 4
> >
> >  #define IDLE_SHORT_TIMEOUT   1
> >
> > @@ -588,15 +588,19 @@ static struct msm_display_topology dpu_encoder_get_topology(
> >
> >       /* Datapath topology selection
> >        *
> > -      * Dual display
> > +      * Dual display without DSC
> >        * 2 LM, 2 INTF ( Split display using 2 interfaces)
> >        *
> > +      * Dual display with DSC
> > +      * 4 LM, 2 INTF ( Split display using 2 interfaces)
> > +      *
> >        * Single display
> >        * 1 LM, 1 INTF
> >        * 2 LM, 1 INTF (stream merge to support high resolution interfaces)
> >        *
> >        * Add dspps to the reservation requirements if ctm is requested
> >        */
> > +
> >       if (intf_count == 2)
> >               topology.num_lm = 2;
> >       else if (!dpu_kms->catalog->caps->has_3d_merge)
> > @@ -615,10 +619,21 @@ static struct msm_display_topology dpu_encoder_get_topology(
> >                * 2 DSC encoders, 2 layer mixers and 1 interface
> >                * this is power optimal and can drive up to (including) 4k
> >                * screens
> > +              * But for dual display case, we prefer 4 layer mixers. Because
> > +              * the resolution is always high in the case and 4 DSCs are more
> > +              * power optimal. While a single SSPP can only co-work with one
> > +              * mixer pair. So 4 mixers are needed in this case.
>
> What is the relationship between SSPP working with a mixer pair and
> high-res using 4 mixers? You have been writing about DSC, then you
> suddently mention SSPP.

Right. Will remove SSPP comment here. Topology is decided by INTF/DSC, and
LM is related directly. No SSPP is related here.

>
> >                */
> > -             topology.num_dsc = 2;
> > -             topology.num_lm = 2;
> > -             topology.num_intf = 1;
> > +
> > +             if (intf_count == 2) {
> > +                     topology.num_dsc = 4;
> > +                     topology.num_lm = 4;
> > +                     topology.num_intf = 2;
> > +             } else {
> > +                     topology.num_dsc = 2;
> > +                     topology.num_lm = 2;
> > +                     topology.num_intf = 1;
> > +             }
> >       }
> >
> >       return topology;
> > @@ -2031,8 +2046,8 @@ static void dpu_encoder_helper_reset_mixers(struct dpu_encoder_phys *phys_enc)
> >       struct dpu_hw_mixer_cfg mixer;
> >       int i, num_lm;
> >       struct dpu_global_state *global_state;
> > -     struct dpu_hw_blk *hw_lm[2];
> > -     struct dpu_hw_mixer *hw_mixer[2];
> > +     struct dpu_hw_blk *hw_lm[MAX_CHANNELS_PER_ENC];
> > +     struct dpu_hw_mixer *hw_mixer[MAX_CHANNELS_PER_ENC];
> >       struct dpu_hw_ctl *ctl = phys_enc->hw_ctl;
> >
> >       memset(&mixer, 0, sizeof(mixer));
> > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
> > index e77ebe3a68da9..c877ee45535ac 100644
> > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
> > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
> > @@ -324,7 +324,8 @@ static inline enum dpu_3d_blend_mode dpu_encoder_helper_get_3d_blend_mode(
> >
> >       /* Use merge_3d unless DSC MERGE topology is used */
> >       if (phys_enc->split_role == ENC_ROLE_SOLO &&
> > -         dpu_cstate->num_mixers == CRTC_DUAL_MIXERS &&
> > +         (dpu_cstate->num_mixers == CRTC_DUAL_MIXERS ||
> > +             dpu_cstate->num_mixers == CRTC_QUAD_MIXERS) &&
> >           !dpu_encoder_use_dsc_merge(phys_enc->parent))
> >               return BLEND_3D_H_ROW_INT;
> >
> > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
> > index bf86d643887dd..f79ecd409a830 100644
> > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
> > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
> > @@ -25,6 +25,7 @@
> >  #define MAX_IMG_HEIGHT 0x3fff
> >
> >  #define CRTC_DUAL_MIXERS     2
> > +#define CRTC_QUAD_MIXERS     4
> >
> >  #define MAX_XIN_COUNT 16
> >
> > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
> > index d8f5cffa60ea6..671e03406df74 100644
> > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
> > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
> > @@ -32,9 +32,9 @@
> >  #define DPU_MAX_PLANES                       4
> >  #endif
> >
> > -#define PIPES_PER_PLANE                      2
> >  #define PIPES_PER_LM_PAIR            2
> >  #define LM_PAIRS_PER_PLANE           2
> > +#define PIPES_PER_PLANE                      (PIPES_PER_LM_PAIR * LM_PAIRS_PER_PLANE)
> >  #ifndef DPU_MAX_DE_CURVES
> >  #define DPU_MAX_DE_CURVES            3
> >  #endif
> >
> > --
> > 2.34.1
> >
>
> --
> With best wishes
> Dmitry