drm/i915/cx0: Add MTL+ .get_hw_state hook

Add .get_hw_state hook to MTL+ platforms for dpll framework.

Signed-off-by: Mika Kahola <mika.kahola@intel.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Link: https://lore.kernel.org/r/20251117104602.2363671-26-mika.kahola@intel.com

3 files changed, 37 insertions, 3 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_cx0_phy.c b/drivers/gpu/drm/i915/display/intel_cx0_phy.c
index a88169b76cfa..bde461878647 100644
--- a/drivers/gpu/drm/i915/display/intel_cx0_phy.c
+++ b/drivers/gpu/drm/i915/display/intel_cx0_phy.c
@@ -3594,19 +3594,24 @@ intel_mtl_port_pll_type(struct intel_encoder *encoder,
 		return ICL_PORT_DPLL_DEFAULT;
 }
 
-void intel_cx0pll_readout_hw_state(struct intel_encoder *encoder,
+bool intel_cx0pll_readout_hw_state(struct intel_encoder *encoder,
 				   struct intel_cx0pll_state *pll_state)
 {
 	memset(pll_state, 0, sizeof(*pll_state));
 
 	pll_state->tbt_mode = intel_tc_port_in_tbt_alt_mode(enc_to_dig_port(encoder));
 	if (pll_state->tbt_mode)
-		return;
+		return true;
+
+	if (!intel_cx0_pll_is_enabled(encoder))
+		return false;
 
 	if (intel_encoder_is_c10phy(encoder))
 		intel_c10pll_readout_hw_state(encoder, pll_state);
 	else
 		intel_c20pll_readout_hw_state(encoder, pll_state);
+
+	return true;
 }
 
 static bool mtl_compare_hw_state_c10(const struct intel_c10pll_state *a,
diff --git a/drivers/gpu/drm/i915/display/intel_cx0_phy.h b/drivers/gpu/drm/i915/display/intel_cx0_phy.h
index acfbaced22f5..37b53faa5e78 100644
--- a/drivers/gpu/drm/i915/display/intel_cx0_phy.h
+++ b/drivers/gpu/drm/i915/display/intel_cx0_phy.h
@@ -37,7 +37,7 @@ intel_mtl_port_pll_type(struct intel_encoder *encoder,
 int intel_cx0pll_calc_state(const struct intel_crtc_state *crtc_state,
 			    struct intel_encoder *encoder,
 			    struct intel_dpll_hw_state *hw_state);
-void intel_cx0pll_readout_hw_state(struct intel_encoder *encoder,
+bool intel_cx0pll_readout_hw_state(struct intel_encoder *encoder,
 				   struct intel_cx0pll_state *pll_state);
 int intel_cx0pll_calc_port_clock(struct intel_encoder *encoder,
 				 const struct intel_cx0pll_state *pll_state);
diff --git a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
index c0ba269dc714..beaf270294ca 100644
--- a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
+++ b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
@@ -4351,7 +4351,36 @@ static const struct intel_dpll_mgr adlp_pll_mgr = {
 	.compare_hw_state = icl_compare_hw_state,
 };
 
+static struct intel_encoder *get_intel_encoder(struct intel_display *display,
+					       const struct intel_dpll *pll)
+{
+	struct intel_encoder *encoder;
+	enum intel_dpll_id mtl_id;
+
+	for_each_intel_encoder(display->drm, encoder) {
+		mtl_id = mtl_port_to_pll_id(display, encoder->port);
+
+		if (mtl_id == pll->info->id)
+			return encoder;
+	}
+
+	return NULL;
+}
+
+static bool mtl_pll_get_hw_state(struct intel_display *display,
+				 struct intel_dpll *pll,
+				 struct intel_dpll_hw_state *dpll_hw_state)
+{
+	struct intel_encoder *encoder = get_intel_encoder(display, pll);
+
+	if (!encoder)
+		return false;
+
+	return intel_cx0pll_readout_hw_state(encoder, &dpll_hw_state->cx0pll);
+}
+
 static const struct intel_dpll_funcs mtl_pll_funcs = {
+	.get_hw_state = mtl_pll_get_hw_state,
 };
 
 static const struct dpll_info mtl_plls[] = {