drm/i915/snps_phy: Use HDMI PLL algorithm for DG2

Try SNPS_PHY HDMI alogorithm, if there are no pre-computed tables.
Also get rid of the helper to get rate for HDMI snps phy, as we no
longer depend only on pre-computed tables.

v2:
-Prefer pre-computed tables over computed values from algorithm. (Jani)

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Tested-by: Khaled Almahallawy <khaled.almahallawy@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250120042122.1029481-3-ankit.k.nautiyal@intel.com

3 files changed, 9 insertions, 31 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c
index ed29dd0ccef0..a0133713725b 100644
--- a/drivers/gpu/drm/i915/display/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
@@ -1918,8 +1918,6 @@ hdmi_port_clock_valid(struct intel_hdmi *hdmi,
 	 */
 	if (DISPLAY_VER(display) >= 14)
 		return intel_cx0_phy_check_hdmi_link_rate(hdmi, clock);
-	else if (IS_DG2(dev_priv))
-		return intel_snps_phy_check_hdmi_link_rate(clock);
 
 	return MODE_OK;
 }
diff --git a/drivers/gpu/drm/i915/display/intel_snps_phy.c b/drivers/gpu/drm/i915/display/intel_snps_phy.c
index 41fe26dc200b..ec3c0ea2f4cb 100644
--- a/drivers/gpu/drm/i915/display/intel_snps_phy.c
+++ b/drivers/gpu/drm/i915/display/intel_snps_phy.c
@@ -11,6 +11,7 @@
 #include "intel_ddi_buf_trans.h"
 #include "intel_de.h"
 #include "intel_display_types.h"
+#include "intel_snps_hdmi_pll.h"
 #include "intel_snps_phy.h"
 #include "intel_snps_phy_regs.h"
 
@@ -1788,24 +1789,9 @@ intel_mpllb_tables_get(struct intel_crtc_state *crtc_state,
 int intel_mpllb_calc_state(struct intel_crtc_state *crtc_state,
 			   struct intel_encoder *encoder)
 {
-	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
 	const struct intel_mpllb_state * const *tables;
 	int i;
 
-	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI)) {
-		if (intel_snps_phy_check_hdmi_link_rate(crtc_state->port_clock)
-		    != MODE_OK) {
-			/*
-			 * FIXME: Can only support fixed HDMI frequencies
-			 * until we have a proper algorithm under a valid
-			 * license.
-			 */
-			drm_dbg_kms(&i915->drm, "Can't support HDMI link rate %d\n",
-				    crtc_state->port_clock);
-			return -EINVAL;
-		}
-	}
-
 	tables = intel_mpllb_tables_get(crtc_state, encoder);
 	if (!tables)
 		return -EINVAL;
@@ -1817,6 +1803,14 @@ int intel_mpllb_calc_state(struct intel_crtc_state *crtc_state,
 		}
 	}
 
+	/* For HDMI PLLs try SNPS PHY algorithm, if there are no precomputed tables */
+	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI)) {
+		intel_snps_hdmi_pll_compute_mpllb(&crtc_state->dpll_hw_state.mpllb,
+						  crtc_state->port_clock);
+
+		return 0;
+	}
+
 	return -EINVAL;
 }
 
@@ -1982,19 +1976,6 @@ void intel_mpllb_readout_hw_state(struct intel_encoder *encoder,
 	pll_state->mpllb_div &= ~SNPS_PHY_MPLLB_FORCE_EN;
 }
 
-int intel_snps_phy_check_hdmi_link_rate(int clock)
-{
-	const struct intel_mpllb_state * const *tables = dg2_hdmi_tables;
-	int i;
-
-	for (i = 0; tables[i]; i++) {
-		if (clock == tables[i]->clock)
-			return MODE_OK;
-	}
-
-	return MODE_CLOCK_RANGE;
-}
-
 void intel_mpllb_state_verify(struct intel_atomic_state *state,
 			      struct intel_crtc *crtc)
 {
diff --git a/drivers/gpu/drm/i915/display/intel_snps_phy.h b/drivers/gpu/drm/i915/display/intel_snps_phy.h
index bc08b92a7cd9..1dd564ed9fa8 100644
--- a/drivers/gpu/drm/i915/display/intel_snps_phy.h
+++ b/drivers/gpu/drm/i915/display/intel_snps_phy.h
@@ -30,7 +30,6 @@ void intel_mpllb_readout_hw_state(struct intel_encoder *encoder,
 int intel_mpllb_calc_port_clock(struct intel_encoder *encoder,
 				const struct intel_mpllb_state *pll_state);
 
-int intel_snps_phy_check_hdmi_link_rate(int clock);
 void intel_snps_phy_set_signal_levels(struct intel_encoder *encoder,
 				      const struct intel_crtc_state *crtc_state);
 void intel_mpllb_state_verify(struct intel_atomic_state *state,