[PATCH 27/44] drm/i915/lt_phy: Add helper to check if the FRL rate is valid

Introduce helper intel_lt_phy_hdmi_frl_rate_valid() to check if the
given FRL rate is supported for the LT Phy.

Signed-off-by: Ankit Nautiyal <[email protected]>
---
 drivers/gpu/drm/i915/display/intel_lt_phy.c | 16 ++++++++++++++++
 drivers/gpu/drm/i915/display/intel_lt_phy.h |  1 +
 2 files changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_lt_phy.c b/drivers/gpu/drm/i915/display/intel_lt_phy.c
index 2c1da689fe00..f7265d32915d 100644
--- a/drivers/gpu/drm/i915/display/intel_lt_phy.c
+++ b/drivers/gpu/drm/i915/display/intel_lt_phy.c
@@ -2652,3 +2652,19 @@ void intel_lt_phy_verify_plls(struct intel_display *display)
 	intel_lt_phy_pll_verify_tables(display, xe3plpd_lt_edp_tables);
 	intel_lt_phy_pll_verify_tables(display, xe3plpd_lt_hdmi_tables);
 }
+
+enum drm_mode_status intel_lt_phy_hdmi_frl_rate_valid(int clock_rate)
+{
+	const struct intel_lt_phy_pll_params *tables = xe3plpd_lt_hdmi_tables;
+	int i;
+
+	for (i = 0; tables[i].name; i++) {
+		if (!intel_hdmi_is_frl(tables[i].clock_rate))
+			continue;
+
+		if (clock_rate == tables[i].clock_rate)
+			return MODE_OK;
+	}
+
+	return MODE_CLOCK_RANGE;
+}
diff --git a/drivers/gpu/drm/i915/display/intel_lt_phy.h b/drivers/gpu/drm/i915/display/intel_lt_phy.h
index 16de39484779..20714ecd9f62 100644
--- a/drivers/gpu/drm/i915/display/intel_lt_phy.h
+++ b/drivers/gpu/drm/i915/display/intel_lt_phy.h
@@ -49,5 +49,6 @@ void intel_xe3plpd_pll_enable(struct intel_encoder *encoder,
 			      const struct intel_dpll_hw_state *dpll_hw_state);
 void intel_xe3plpd_pll_disable(struct intel_encoder *encoder);
 void intel_lt_phy_verify_plls(struct intel_display *display);
+enum drm_mode_status intel_lt_phy_hdmi_frl_rate_valid(int clock_rate);
 
 #endif /* __INTEL_LT_PHY_H__ */
-- 
2.50.1