diff mbox

[12/12] drm/i915/skl+: consider max supported plane pixel rate while scaling

Message ID 20170515083437.31394-13-mahesh1.kumar@intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

Kumar, Mahesh May 15, 2017, 8:34 a.m. UTC
From: "Kumar, Mahesh" <mahesh1.kumar@intel.com>

A display resolution is only supported if it meets all the restrictions
below for Maximum Pipe Pixel Rate.

The display resolution must fit within the maximum pixel rate output
from the pipe. Make sure that the display pipe is able to feed pixels at
a rate required to support the desired resolution.
For each enabled plane on the pipe {
    If plane scaling enabled {
	Horizontal down scale amount = Maximum[1, plane horizontal size /
		    scaler horizontal window size]
	Vertical down scale amount = Maximum[1, plane vertical size /
		    scaler vertical window size]
	Plane down scale amount = Horizontal down scale amount *
		    Vertical down scale amount
	Plane Ratio = 1 / Plane down scale amount
    }
    Else {
	Plane Ratio = 1
    }
    If plane source pixel format is 64 bits per pixel {
	Plane Ratio = Plane Ratio * 8/9
    }
}

Pipe Ratio = Minimum Plane Ratio of all enabled planes on the pipe

If pipe scaling is enabled {
    Horizontal down scale amount = Maximum[1, pipe horizontal source size /
		scaler horizontal window size]
    Vertical down scale amount = Maximum[1, pipe vertical source size /
		scaler vertical window size]
    Note: The progressive fetch - interlace display mode is equivalent to a
		2.0 vertical down scale
    Pipe down scale amount = Horizontal down scale amount *
		Vertical down scale amount
    Pipe Ratio = Pipe Ratio / Pipe down scale amount
}

Pipe maximum pixel rate = CDCLK frequency * Pipe Ratio

Changes since V1:
 - separate out fixed_16_16 wrapper API definition
Changes since V2:
 - Fix buggy crtc !active condition (Maarten)
 - use intel_wm_plane_visible wrapper as per Maarten's suggestion
Changes since V3:
 - Change failure return from ERANGE to EINVAL
Changes since V3:
 - Rebase based on previous patch changes

Signed-off-by: Mahesh Kumar <mahesh1.kumar@intel.com>
---
 drivers/gpu/drm/i915/intel_display.c |  3 ++
 drivers/gpu/drm/i915/intel_drv.h     |  2 +
 drivers/gpu/drm/i915/intel_pm.c      | 87 ++++++++++++++++++++++++++++++++++++
 3 files changed, 92 insertions(+)

Comments

Matt Roper May 15, 2017, 10:39 p.m. UTC | #1
On Mon, May 15, 2017 at 02:04:37PM +0530, Mahesh Kumar wrote:
> From: "Kumar, Mahesh" <mahesh1.kumar@intel.com>
> 
> A display resolution is only supported if it meets all the restrictions
> below for Maximum Pipe Pixel Rate.
> 
> The display resolution must fit within the maximum pixel rate output
> from the pipe. Make sure that the display pipe is able to feed pixels at
> a rate required to support the desired resolution.
> For each enabled plane on the pipe {
>     If plane scaling enabled {
> 	Horizontal down scale amount = Maximum[1, plane horizontal size /
> 		    scaler horizontal window size]
> 	Vertical down scale amount = Maximum[1, plane vertical size /
> 		    scaler vertical window size]
> 	Plane down scale amount = Horizontal down scale amount *
> 		    Vertical down scale amount
> 	Plane Ratio = 1 / Plane down scale amount
>     }
>     Else {
> 	Plane Ratio = 1
>     }
>     If plane source pixel format is 64 bits per pixel {
> 	Plane Ratio = Plane Ratio * 8/9
>     }
> }
> 
> Pipe Ratio = Minimum Plane Ratio of all enabled planes on the pipe
> 
> If pipe scaling is enabled {
>     Horizontal down scale amount = Maximum[1, pipe horizontal source size /
> 		scaler horizontal window size]
>     Vertical down scale amount = Maximum[1, pipe vertical source size /
> 		scaler vertical window size]
>     Note: The progressive fetch - interlace display mode is equivalent to a
> 		2.0 vertical down scale
>     Pipe down scale amount = Horizontal down scale amount *
> 		Vertical down scale amount
>     Pipe Ratio = Pipe Ratio / Pipe down scale amount
> }
> 
> Pipe maximum pixel rate = CDCLK frequency * Pipe Ratio

It looks like you copied the above from the bspec, but you might want to
add a note that the actual calculations you do in the code just work
with down scale amounts rather than ratios, which is why a lot of the
code is inverted from the logic above.


> 
> Changes since V1:
>  - separate out fixed_16_16 wrapper API definition
> Changes since V2:
>  - Fix buggy crtc !active condition (Maarten)
>  - use intel_wm_plane_visible wrapper as per Maarten's suggestion
> Changes since V3:
>  - Change failure return from ERANGE to EINVAL
> Changes since V3:
>  - Rebase based on previous patch changes
> 
> Signed-off-by: Mahesh Kumar <mahesh1.kumar@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_display.c |  3 ++
>  drivers/gpu/drm/i915/intel_drv.h     |  2 +
>  drivers/gpu/drm/i915/intel_pm.c      | 87 ++++++++++++++++++++++++++++++++++++
>  3 files changed, 92 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index c1cbfcef1f89..2cc1d11d9e6c 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -11186,6 +11186,9 @@ static int intel_crtc_atomic_check(struct drm_crtc *crtc,
>  			ret = skl_update_scaler_crtc(pipe_config);
>  
>  		if (!ret)
> +			ret = skl_check_pipe_max_pixel_rate(intel_crtc,
> +							    pipe_config);
> +		if (!ret)
>  			ret = intel_atomic_setup_scalers(dev_priv, intel_crtc,
>  							 pipe_config);
>  	}
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index bd500977b3fc..93afac4a83fa 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -1885,6 +1885,8 @@ bool skl_ddb_allocation_overlaps(const struct skl_ddb_entry **entries,
>  				 int ignore);
>  bool ilk_disable_lp_wm(struct drm_device *dev);
>  int sanitize_rc6_option(struct drm_i915_private *dev_priv, int enable_rc6);
> +int skl_check_pipe_max_pixel_rate(struct intel_crtc *intel_crtc,
> +				  struct intel_crtc_state *cstate);
>  static inline int intel_enable_rc6(void)
>  {
>  	return i915.enable_rc6;
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index d6b0ae0ef7a2..5a3d3398ae19 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -3863,6 +3863,93 @@ skl_plane_downscale_amount(const struct intel_crtc_state *cstate,
>  	return mul_fixed16(downscale_w, downscale_h);
>  }
>  
> +static uint_fixed_16_16_t
> +skl_pipe_downscale_amount(const struct intel_crtc_state *config)
> +{
> +	uint_fixed_16_16_t pipe_downscale = u32_to_fixed_16_16(1);
> +
> +	if (!config->base.active)
> +		return pipe_downscale;
> +
> +	if (config->pch_pfit.enabled) {
> +		uint32_t src_w, src_h, dst_w, dst_h;
> +		uint32_t pfit_size = config->pch_pfit.size;
> +		uint_fixed_16_16_t fp_w_ratio, fp_h_ratio;
> +		uint_fixed_16_16_t downscale_h, downscale_w;
> +
> +		src_w = config->pipe_src_w;
> +		src_h = config->pipe_src_h;
> +		dst_w = pfit_size >> 16;
> +		dst_h = pfit_size & 0xffff;
> +
> +		if (!dst_w || !dst_h)
> +			return pipe_downscale;
> +
> +		fp_w_ratio = fixed_16_16_div(src_w, dst_w);
> +		fp_h_ratio = fixed_16_16_div(src_h, dst_h);
> +		downscale_w = max_fixed_16_16(fp_w_ratio, u32_to_fixed_16_16(1));
> +		downscale_h = max_fixed_16_16(fp_h_ratio, u32_to_fixed_16_16(1));
> +
> +		pipe_downscale = mul_fixed16(downscale_w, downscale_h);
> +	}
> +
> +	return pipe_downscale;
> +}
> +
> +int skl_check_pipe_max_pixel_rate(struct intel_crtc *intel_crtc,
> +				  struct intel_crtc_state *cstate)
> +{
> +	struct drm_crtc_state *crtc_state = &cstate->base;
> +	struct drm_atomic_state *state = crtc_state->state;
> +	struct drm_plane *plane;
> +	const struct drm_plane_state *pstate;
> +	struct intel_plane_state *intel_pstate;
> +	int crtc_clock, cdclk;
> +	uint32_t pipe_max_pixel_rate;
> +	uint_fixed_16_16_t pipe_downscale;
> +	uint_fixed_16_16_t max_downscale = u32_to_fixed_16_16(1);
> +
> +	if (!cstate->base.active)
> +		return 0;
> +
> +	drm_atomic_crtc_state_for_each_plane_state(plane, pstate, crtc_state) {
> +		uint_fixed_16_16_t plane_downscale;
> +		uint_fixed_16_16_t fp_9_div_8 = fixed_16_16_div(9, 8);
> +		int bpp;
> +
> +		if (!intel_wm_plane_visible(cstate,
> +					    to_intel_plane_state(pstate)))
> +			continue;
> +
> +		if (WARN_ON(!pstate->fb))
> +			continue;
> +
> +		intel_pstate = to_intel_plane_state(pstate);
> +		plane_downscale = skl_plane_downscale_amount(cstate,
> +							     intel_pstate);
> +		bpp = pstate->fb->format->cpp[0] * 8;
> +		if (bpp == 64)
> +			plane_downscale = mul_fixed16(plane_downscale,
> +						      fp_9_div_8);
> +
> +		max_downscale = max_fixed_16_16(plane_downscale, max_downscale);
> +	}
> +	pipe_downscale = skl_pipe_downscale_amount(cstate);
> +
> +	pipe_downscale = mul_fixed16(pipe_downscale, max_downscale);
> +
> +	crtc_clock = crtc_state->adjusted_mode.crtc_clock;
> +	cdclk = to_intel_atomic_state(state)->cdclk.logical.cdclk;
> +	pipe_max_pixel_rate = div_round_up_u32_fixed16(cdclk, pipe_downscale);
> +
> +	if (pipe_max_pixel_rate < crtc_clock) {
> +		DRM_ERROR("Max supported pixel clock with scaling exceeds\n");

There seems to be a typo in the message here.  I think you either meant
"Max supported pixel clock with scaling exceeded." or "Max supported
pixel clock with scaling exceeds [platform limits]."

With that fixed (and possible a slightly clarified commit message).

Reviewed-by: Matt Roper <matthew.d.roper@intel.com>

> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
>  static unsigned int
>  skl_plane_relative_data_rate(const struct intel_crtc_state *cstate,
>  			     const struct drm_plane_state *pstate,
> -- 
> 2.11.0
>
Maarten Lankhorst May 16, 2017, 11:27 a.m. UTC | #2
Op 15-05-17 om 10:34 schreef Mahesh Kumar:
> From: "Kumar, Mahesh" <mahesh1.kumar@intel.com>
>
> A display resolution is only supported if it meets all the restrictions
> below for Maximum Pipe Pixel Rate.
>
> The display resolution must fit within the maximum pixel rate output
> from the pipe. Make sure that the display pipe is able to feed pixels at
> a rate required to support the desired resolution.
> For each enabled plane on the pipe {
>     If plane scaling enabled {
> 	Horizontal down scale amount = Maximum[1, plane horizontal size /
> 		    scaler horizontal window size]
> 	Vertical down scale amount = Maximum[1, plane vertical size /
> 		    scaler vertical window size]
> 	Plane down scale amount = Horizontal down scale amount *
> 		    Vertical down scale amount
> 	Plane Ratio = 1 / Plane down scale amount
>     }
>     Else {
> 	Plane Ratio = 1
>     }
>     If plane source pixel format is 64 bits per pixel {
> 	Plane Ratio = Plane Ratio * 8/9
>     }
> }
>
> Pipe Ratio = Minimum Plane Ratio of all enabled planes on the pipe
>
> If pipe scaling is enabled {
>     Horizontal down scale amount = Maximum[1, pipe horizontal source size /
> 		scaler horizontal window size]
>     Vertical down scale amount = Maximum[1, pipe vertical source size /
> 		scaler vertical window size]
>     Note: The progressive fetch - interlace display mode is equivalent to a
> 		2.0 vertical down scale
>     Pipe down scale amount = Horizontal down scale amount *
> 		Vertical down scale amount
>     Pipe Ratio = Pipe Ratio / Pipe down scale amount
> }
>
> Pipe maximum pixel rate = CDCLK frequency * Pipe Ratio
>
> Changes since V1:
>  - separate out fixed_16_16 wrapper API definition
> Changes since V2:
>  - Fix buggy crtc !active condition (Maarten)
>  - use intel_wm_plane_visible wrapper as per Maarten's suggestion
> Changes since V3:
>  - Change failure return from ERANGE to EINVAL
> Changes since V3:
>  - Rebase based on previous patch changes
>
> Signed-off-by: Mahesh Kumar <mahesh1.kumar@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_display.c |  3 ++
>  drivers/gpu/drm/i915/intel_drv.h     |  2 +
>  drivers/gpu/drm/i915/intel_pm.c      | 87 ++++++++++++++++++++++++++++++++++++
>  3 files changed, 92 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index c1cbfcef1f89..2cc1d11d9e6c 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -11186,6 +11186,9 @@ static int intel_crtc_atomic_check(struct drm_crtc *crtc,
>  			ret = skl_update_scaler_crtc(pipe_config);
>  
>  		if (!ret)
> +			ret = skl_check_pipe_max_pixel_rate(intel_crtc,
> +							    pipe_config);
> +		if (!ret)
>  			ret = intel_atomic_setup_scalers(dev_priv, intel_crtc,
>  							 pipe_config);
>  	}
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index bd500977b3fc..93afac4a83fa 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -1885,6 +1885,8 @@ bool skl_ddb_allocation_overlaps(const struct skl_ddb_entry **entries,
>  				 int ignore);
>  bool ilk_disable_lp_wm(struct drm_device *dev);
>  int sanitize_rc6_option(struct drm_i915_private *dev_priv, int enable_rc6);
> +int skl_check_pipe_max_pixel_rate(struct intel_crtc *intel_crtc,
> +				  struct intel_crtc_state *cstate);
>  static inline int intel_enable_rc6(void)
>  {
>  	return i915.enable_rc6;
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index d6b0ae0ef7a2..5a3d3398ae19 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -3863,6 +3863,93 @@ skl_plane_downscale_amount(const struct intel_crtc_state *cstate,
>  	return mul_fixed16(downscale_w, downscale_h);
>  }
>  
> +static uint_fixed_16_16_t
> +skl_pipe_downscale_amount(const struct intel_crtc_state *config)
> +{
> +	uint_fixed_16_16_t pipe_downscale = u32_to_fixed_16_16(1);
> +
> +	if (!config->base.active)
> +		return pipe_downscale;
> +
> +	if (config->pch_pfit.enabled) {
> +		uint32_t src_w, src_h, dst_w, dst_h;
> +		uint32_t pfit_size = config->pch_pfit.size;
> +		uint_fixed_16_16_t fp_w_ratio, fp_h_ratio;
> +		uint_fixed_16_16_t downscale_h, downscale_w;
> +
> +		src_w = config->pipe_src_w;
> +		src_h = config->pipe_src_h;
> +		dst_w = pfit_size >> 16;
> +		dst_h = pfit_size & 0xffff;
> +
> +		if (!dst_w || !dst_h)
> +			return pipe_downscale;
> +
> +		fp_w_ratio = fixed_16_16_div(src_w, dst_w);
> +		fp_h_ratio = fixed_16_16_div(src_h, dst_h);
> +		downscale_w = max_fixed_16_16(fp_w_ratio, u32_to_fixed_16_16(1));
> +		downscale_h = max_fixed_16_16(fp_h_ratio, u32_to_fixed_16_16(1));
> +
> +		pipe_downscale = mul_fixed16(downscale_w, downscale_h);
> +	}
> +
> +	return pipe_downscale;
> +}
> +
> +int skl_check_pipe_max_pixel_rate(struct intel_crtc *intel_crtc,
> +				  struct intel_crtc_state *cstate)
> +{
> +	struct drm_crtc_state *crtc_state = &cstate->base;
> +	struct drm_atomic_state *state = crtc_state->state;
> +	struct drm_plane *plane;
> +	const struct drm_plane_state *pstate;
> +	struct intel_plane_state *intel_pstate;
> +	int crtc_clock, cdclk;
> +	uint32_t pipe_max_pixel_rate;
> +	uint_fixed_16_16_t pipe_downscale;
> +	uint_fixed_16_16_t max_downscale = u32_to_fixed_16_16(1);
> +
> +	if (!cstate->base.active)
> +		return 0;
> +
> +	drm_atomic_crtc_state_for_each_plane_state(plane, pstate, crtc_state) {
> +		uint_fixed_16_16_t plane_downscale;
> +		uint_fixed_16_16_t fp_9_div_8 = fixed_16_16_div(9, 8);
> +		int bpp;
> +
> +		if (!intel_wm_plane_visible(cstate,
> +					    to_intel_plane_state(pstate)))
> +			continue;
> +
> +		if (WARN_ON(!pstate->fb))
> +			continue;
return -EINVAL in this case? Though it should obviously never happen.

Otherwise series looks good now, I need to look at patch 11 in more detail. But for the rest definitely
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> +		intel_pstate = to_intel_plane_state(pstate);
> +		plane_downscale = skl_plane_downscale_amount(cstate,
> +							     intel_pstate);
> +		bpp = pstate->fb->format->cpp[0] * 8;
> +		if (bpp == 64)
> +			plane_downscale = mul_fixed16(plane_downscale,
> +						      fp_9_div_8);
> +
> +		max_downscale = max_fixed_16_16(plane_downscale, max_downscale);
> +	}
> +	pipe_downscale = skl_pipe_downscale_amount(cstate);
> +
> +	pipe_downscale = mul_fixed16(pipe_downscale, max_downscale);
> +
> +	crtc_clock = crtc_state->adjusted_mode.crtc_clock;
> +	cdclk = to_intel_atomic_state(state)->cdclk.logical.cdclk;
> +	pipe_max_pixel_rate = div_round_up_u32_fixed16(cdclk, pipe_downscale);
> +
> +	if (pipe_max_pixel_rate < crtc_clock) {
> +		DRM_ERROR("Max supported pixel clock with scaling exceeds\n");
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
>  static unsigned int
>  skl_plane_relative_data_rate(const struct intel_crtc_state *cstate,
>  			     const struct drm_plane_state *pstate,
diff mbox

Patch

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index c1cbfcef1f89..2cc1d11d9e6c 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -11186,6 +11186,9 @@  static int intel_crtc_atomic_check(struct drm_crtc *crtc,
 			ret = skl_update_scaler_crtc(pipe_config);
 
 		if (!ret)
+			ret = skl_check_pipe_max_pixel_rate(intel_crtc,
+							    pipe_config);
+		if (!ret)
 			ret = intel_atomic_setup_scalers(dev_priv, intel_crtc,
 							 pipe_config);
 	}
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index bd500977b3fc..93afac4a83fa 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1885,6 +1885,8 @@  bool skl_ddb_allocation_overlaps(const struct skl_ddb_entry **entries,
 				 int ignore);
 bool ilk_disable_lp_wm(struct drm_device *dev);
 int sanitize_rc6_option(struct drm_i915_private *dev_priv, int enable_rc6);
+int skl_check_pipe_max_pixel_rate(struct intel_crtc *intel_crtc,
+				  struct intel_crtc_state *cstate);
 static inline int intel_enable_rc6(void)
 {
 	return i915.enable_rc6;
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index d6b0ae0ef7a2..5a3d3398ae19 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3863,6 +3863,93 @@  skl_plane_downscale_amount(const struct intel_crtc_state *cstate,
 	return mul_fixed16(downscale_w, downscale_h);
 }
 
+static uint_fixed_16_16_t
+skl_pipe_downscale_amount(const struct intel_crtc_state *config)
+{
+	uint_fixed_16_16_t pipe_downscale = u32_to_fixed_16_16(1);
+
+	if (!config->base.active)
+		return pipe_downscale;
+
+	if (config->pch_pfit.enabled) {
+		uint32_t src_w, src_h, dst_w, dst_h;
+		uint32_t pfit_size = config->pch_pfit.size;
+		uint_fixed_16_16_t fp_w_ratio, fp_h_ratio;
+		uint_fixed_16_16_t downscale_h, downscale_w;
+
+		src_w = config->pipe_src_w;
+		src_h = config->pipe_src_h;
+		dst_w = pfit_size >> 16;
+		dst_h = pfit_size & 0xffff;
+
+		if (!dst_w || !dst_h)
+			return pipe_downscale;
+
+		fp_w_ratio = fixed_16_16_div(src_w, dst_w);
+		fp_h_ratio = fixed_16_16_div(src_h, dst_h);
+		downscale_w = max_fixed_16_16(fp_w_ratio, u32_to_fixed_16_16(1));
+		downscale_h = max_fixed_16_16(fp_h_ratio, u32_to_fixed_16_16(1));
+
+		pipe_downscale = mul_fixed16(downscale_w, downscale_h);
+	}
+
+	return pipe_downscale;
+}
+
+int skl_check_pipe_max_pixel_rate(struct intel_crtc *intel_crtc,
+				  struct intel_crtc_state *cstate)
+{
+	struct drm_crtc_state *crtc_state = &cstate->base;
+	struct drm_atomic_state *state = crtc_state->state;
+	struct drm_plane *plane;
+	const struct drm_plane_state *pstate;
+	struct intel_plane_state *intel_pstate;
+	int crtc_clock, cdclk;
+	uint32_t pipe_max_pixel_rate;
+	uint_fixed_16_16_t pipe_downscale;
+	uint_fixed_16_16_t max_downscale = u32_to_fixed_16_16(1);
+
+	if (!cstate->base.active)
+		return 0;
+
+	drm_atomic_crtc_state_for_each_plane_state(plane, pstate, crtc_state) {
+		uint_fixed_16_16_t plane_downscale;
+		uint_fixed_16_16_t fp_9_div_8 = fixed_16_16_div(9, 8);
+		int bpp;
+
+		if (!intel_wm_plane_visible(cstate,
+					    to_intel_plane_state(pstate)))
+			continue;
+
+		if (WARN_ON(!pstate->fb))
+			continue;
+
+		intel_pstate = to_intel_plane_state(pstate);
+		plane_downscale = skl_plane_downscale_amount(cstate,
+							     intel_pstate);
+		bpp = pstate->fb->format->cpp[0] * 8;
+		if (bpp == 64)
+			plane_downscale = mul_fixed16(plane_downscale,
+						      fp_9_div_8);
+
+		max_downscale = max_fixed_16_16(plane_downscale, max_downscale);
+	}
+	pipe_downscale = skl_pipe_downscale_amount(cstate);
+
+	pipe_downscale = mul_fixed16(pipe_downscale, max_downscale);
+
+	crtc_clock = crtc_state->adjusted_mode.crtc_clock;
+	cdclk = to_intel_atomic_state(state)->cdclk.logical.cdclk;
+	pipe_max_pixel_rate = div_round_up_u32_fixed16(cdclk, pipe_downscale);
+
+	if (pipe_max_pixel_rate < crtc_clock) {
+		DRM_ERROR("Max supported pixel clock with scaling exceeds\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static unsigned int
 skl_plane_relative_data_rate(const struct intel_crtc_state *cstate,
 			     const struct drm_plane_state *pstate,