[Intel-gfx] [PATCH v4 11/22] drm/i915/mtl: C20 port clock calculation

[Mika Kahola]

Calculate port clock with C20 phy.

v2: Initialize parameters

Signed-off-by: Mika Kahola <mika.kahola at intel.com>
---
 drivers/gpu/drm/i915/display/intel_cx0_phy.c | 64 +++++++++++++++++++-
 drivers/gpu/drm/i915/display/intel_cx0_phy.h |  2 +
 drivers/gpu/drm/i915/display/intel_ddi.c     |  4 +-
 3 files changed, 65 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_cx0_phy.c b/drivers/gpu/drm/i915/display/intel_cx0_phy.c
index bc6913a7444a..60db8d1b7589 100644
--- a/drivers/gpu/drm/i915/display/intel_cx0_phy.c
+++ b/drivers/gpu/drm/i915/display/intel_cx0_phy.c
@@ -1626,6 +1626,18 @@ intel_c10_mpllb_tables_get(struct intel_crtc_state *crtc_state,
 	return NULL;
 }
 
+static const struct intel_c20pll_state * const *
+intel_c20_pll_tables_get(struct intel_crtc_state *crtc_state,
+			 struct intel_encoder *encoder)
+{
+	if (intel_crtc_has_dp_encoder(crtc_state)) {
+		return mtl_c20_dp_tables;
+	}
+
+	MISSING_CASE(encoder->type);
+	return NULL;
+}
+
 static int intel_c10mpllb_calc_state(struct intel_crtc_state *crtc_state,
 				     struct intel_encoder *encoder)
 {
@@ -1657,15 +1669,36 @@ static int intel_c10mpllb_calc_state(struct intel_crtc_state *crtc_state,
 	return -EINVAL;
 }
 
+static int intel_c20pll_calc_state(struct intel_crtc_state *crtc_state,
+				   struct intel_encoder *encoder)
+{
+	const struct intel_c20pll_state * const *tables;
+	int i;
+
+	tables = intel_c20_pll_tables_get(crtc_state, encoder);
+	if (!tables)
+		return -EINVAL;
+
+	for (i = 0; tables[i]; i++) {
+		if (crtc_state->port_clock <= tables[i]->clock) {
+			crtc_state->cx0pll_state.c20pll_state = *tables[i];
+			return 0;
+		}
+	}
+
+	return -EINVAL;
+}
+
 int intel_cx0mpllb_calc_state(struct intel_crtc_state *crtc_state,
 			      struct intel_encoder *encoder)
 {
 	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
 	enum phy phy = intel_port_to_phy(i915, encoder->port);
 
-	drm_WARN_ON(&i915->drm, !intel_is_c10phy(i915, phy));
-
-	return intel_c10mpllb_calc_state(crtc_state, encoder);
+	if (intel_is_c10phy(i915, phy))
+		return intel_c10mpllb_calc_state(crtc_state, encoder);
+	else
+		return intel_c20pll_calc_state(crtc_state, encoder);
 }
 
 void intel_c10mpllb_readout_hw_state(struct intel_encoder *encoder,
@@ -2111,6 +2144,31 @@ int intel_c10mpllb_calc_port_clock(struct intel_encoder *encoder,
 	return tmpclk;
 }
 
+int intel_c20pll_calc_port_clock(struct intel_encoder *encoder,
+				 const struct intel_c20pll_state *pll_state)
+{
+	unsigned int frac_quot = 0, frac_rem = 0, frac_den = 1;
+	unsigned int multiplier = 0, tx_clk_div = 0, refclk = 38400;
+
+	if (pll_state->mpllb[6] & C20_MPLLB_FRACEN) {
+		frac_quot = pll_state->mpllb[8];
+		frac_rem =  pll_state->mpllb[9];
+		frac_den =  pll_state->mpllb[7];
+		multiplier = REG_FIELD_GET(C20_MULTIPLIER_MASK, pll_state->mpllb[0]);
+		tx_clk_div = REG_FIELD_GET(C20_MPLLB_TX_CLK_DIV_MASK, pll_state->mpllb[0]);
+	} else if (pll_state->mplla[6] & C20_MPLLA_FRACEN) {
+		frac_quot = pll_state->mplla[8];
+		frac_rem =  pll_state->mplla[9];
+		frac_den =  pll_state->mplla[7];
+		multiplier = REG_FIELD_GET(C20_MULTIPLIER_MASK, pll_state->mplla[0]);
+		tx_clk_div = REG_FIELD_GET(C20_MPLLA_TX_CLK_DIV_MASK, pll_state->mplla[1]);
+       }
+
+	return DIV_ROUND_CLOSEST_ULL(mul_u32_u32(refclk, (multiplier << 16) + frac_quot) +
+	       DIV_ROUND_CLOSEST(refclk * frac_rem, frac_den),
+				 10 << (tx_clk_div + 16));
+}
+
 static void intel_program_port_clock_ctl(struct intel_encoder *encoder,
 					 const struct intel_crtc_state *crtc_state,
 					 bool lane_reversal)
diff --git a/drivers/gpu/drm/i915/display/intel_cx0_phy.h b/drivers/gpu/drm/i915/display/intel_cx0_phy.h
index 0b46b2ad48a9..0a8e76fd101e 100644
--- a/drivers/gpu/drm/i915/display/intel_cx0_phy.h
+++ b/drivers/gpu/drm/i915/display/intel_cx0_phy.h
@@ -43,6 +43,8 @@ int intel_c10mpllb_calc_port_clock(struct intel_encoder *encoder,
 				   const struct intel_c10mpllb_state *pll_state);
 void intel_c10mpllb_state_verify(struct intel_atomic_state *state,
 				 struct intel_crtc_state *new_crtc_state);
+int intel_c20pll_calc_port_clock(struct intel_encoder *encoder,
+				 const struct intel_c20pll_state *pll_state);
 int intel_cx0_phy_check_hdmi_link_rate(struct intel_hdmi *hdmi, int clock);
 void intel_cx0_phy_set_signal_levels(struct intel_encoder *encoder,
 				     const struct intel_crtc_state *crtc_state);
diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 4e8f3632b3bc..5ec856e3c3bf 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -3520,13 +3520,13 @@ static void mtl_ddi_get_config(struct intel_encoder *encoder,
 	if (intel_is_c10phy(i915, phy)) {
 		intel_c10mpllb_readout_hw_state(encoder, &crtc_state->cx0pll_state.c10mpllb_state);
 		intel_c10mpllb_dump_hw_state(i915, &crtc_state->cx0pll_state.c10mpllb_state);
+		crtc_state->port_clock = intel_c10mpllb_calc_port_clock(encoder, &crtc_state->cx0pll_state.c10mpllb_state);
 	} else {
 		intel_c20pll_readout_hw_state(encoder, &crtc_state->cx0pll_state.c20pll_state);
 		intel_c20pll_dump_hw_state(i915, &crtc_state->cx0pll_state.c20pll_state);
+		crtc_state->port_clock = intel_c20pll_calc_port_clock(encoder, &crtc_state->cx0pll_state.c20pll_state);
 	}
 
-	crtc_state->port_clock = intel_c10mpllb_calc_port_clock(encoder, &crtc_state->cx0pll_state.c10mpllb_state);
-
 	intel_ddi_get_config(encoder, crtc_state);
 }
 
-- 
2.34.1