[PATCH 8/8] drm/i915/skl+: consider max supported plane pixel rate while scaling

[Mahesh Kumar <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

Signed-off-by: Mahesh Kumar <mahesh1.kumar@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h      | 11 +++++
 drivers/gpu/drm/i915/intel_display.c |  3 ++
 drivers/gpu/drm/i915/intel_drv.h     |  2 +
 drivers/gpu/drm/i915/intel_pm.c      | 86 ++++++++++++++++++++++++++++++++++++
 4 files changed, 102 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index e2bb1d0435f1..3d4f12abab76 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -201,6 +201,17 @@ static inline uint_fixed_16_16_t fixed_16_16_div_u64(uint32_t val,
 	return res;
 }
 
+static inline uint32_t fixed_16_16_div_round_up_u64(uint32_t val,
+						    uint_fixed_16_16_t d)
+{
+	uint64_t interm_val;
+
+	interm_val = (uint64_t)val << 16;
+	interm_val = DIV_ROUND_UP_ULL(interm_val, d.val);
+	WARN_ON(interm_val >> 32);
+	return clamp_t(uint32_t, interm_val, 0, ~0);
+}
+
 static inline uint_fixed_16_16_t mul_u32_fixed_16_16(uint32_t val,
 						     uint_fixed_16_16_t mul)
 {
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index d1831809ad3d..79a55e79b1fd 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -11037,6 +11037,9 @@ 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 3c8aaca947d3..2e4dea6f4f62 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1825,6 +1825,8 @@ 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 84979b0af684..843588ab97f6 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3187,6 +3187,92 @@ skl_plane_downscale_amount(const struct intel_plane_state *pstate)
 	return mul_fixed_16_16(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_fixed_16_16(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 (!pstate->visible)
+			continue;
+
+		if (WARN_ON(!pstate->fb))
+			continue;
+
+		intel_pstate = to_intel_plane_state(pstate);
+		plane_downscale = skl_plane_downscale_amount(intel_pstate);
+		bpp = pstate->fb->format->cpp[0] * 8;
+		if (bpp == 64)
+			plane_downscale = mul_fixed_16_16(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_fixed_16_16(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 = fixed_16_16_div_round_up_u64(cdclk,
+							   pipe_downscale);
+
+	if (pipe_max_pixel_rate < crtc_clock) {
+		DRM_ERROR("Max supported pixel clock with scaling exceeds\n");
+		return -ERANGE;
+	}
+
+	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

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx