[PATCH v2 28/32] drm/i915/power: Use intel_encoder_is_tc()

[Gustavo Sousa <gustavo.sousa@intel.com>]

Starting with Xe3p_LPD, when intel_phy_is_tc() returns true, it does
not necessarily mean that the port is connected to a PHY in the Type-C
subsystem.  The reason is that there is now a VBT field called
dedicated_external that will indicate that a Type-C capable port is
connected to a (most likely) combo/dedicated PHY.  When that's the case,
we must not do the extra programming required for Type-C connections.

In an upcoming change, we will modify intel_encoder_is_tc() to take the
VBT field dedicated_external into consideration.  Update
intel_display_power_well.c to use that function instead of
intel_phy_is_tc().

Note that, even though icl_aux_power_well_{enable,disable} are not part
of Xe3p_LPD's display paths, we modify them anyway for uniformity.

Cc: Shekhar Chauhan <shekhar.chauhan@intel.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Signed-off-by: Gustavo Sousa <gustavo.sousa@intel.com>
---
 .../drm/i915/display/intel_display_power_well.c    | 26 +++++++++++++++-------
 1 file changed, 18 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display_power_well.c b/drivers/gpu/drm/i915/display/intel_display_power_well.c
index ba2552adb58b..e8200672dcf3 100644
--- a/drivers/gpu/drm/i915/display/intel_display_power_well.c
+++ b/drivers/gpu/drm/i915/display/intel_display_power_well.c
@@ -256,8 +256,9 @@ aux_ch_to_digital_port(struct intel_display *display,
 	return NULL;
 }
 
-static enum phy icl_aux_pw_to_phy(struct intel_display *display,
-				  const struct i915_power_well *power_well)
+static struct intel_encoder *
+icl_aux_pw_to_encoder(struct intel_display *display,
+		      const struct i915_power_well *power_well)
 {
 	enum aux_ch aux_ch = icl_aux_pw_to_ch(power_well);
 	struct intel_digital_port *dig_port = aux_ch_to_digital_port(display, aux_ch);
@@ -269,7 +270,15 @@ static enum phy icl_aux_pw_to_phy(struct intel_display *display,
 	 * as HDMI-only and routed to a combo PHY, the encoder either won't be
 	 * present at all or it will not have an aux_ch assigned.
 	 */
-	return dig_port ? intel_encoder_to_phy(&dig_port->base) : PHY_NONE;
+	return dig_port ? &dig_port->base : NULL;
+}
+
+static enum phy icl_aux_pw_to_phy(struct intel_display *display,
+				  const struct i915_power_well *power_well)
+{
+	struct intel_encoder *encoder = icl_aux_pw_to_encoder(display, power_well);
+
+	return encoder ? intel_encoder_to_phy(encoder) : PHY_NONE;
 }
 
 static void hsw_wait_for_power_well_enable(struct intel_display *display,
@@ -568,9 +577,9 @@ static void
 icl_aux_power_well_enable(struct intel_display *display,
 			  struct i915_power_well *power_well)
 {
-	enum phy phy = icl_aux_pw_to_phy(display, power_well);
+	struct intel_encoder *encoder = icl_aux_pw_to_encoder(display, power_well);
 
-	if (intel_phy_is_tc(display, phy))
+	if (encoder && intel_encoder_is_tc(encoder))
 		return icl_tc_phy_aux_power_well_enable(display, power_well);
 	else if (display->platform.icelake)
 		return icl_combo_phy_aux_power_well_enable(display,
@@ -583,9 +592,9 @@ static void
 icl_aux_power_well_disable(struct intel_display *display,
 			   struct i915_power_well *power_well)
 {
-	enum phy phy = icl_aux_pw_to_phy(display, power_well);
+	struct intel_encoder *encoder = icl_aux_pw_to_encoder(display, power_well);
 
-	if (intel_phy_is_tc(display, phy))
+	if (encoder && intel_encoder_is_tc(encoder))
 		return hsw_power_well_disable(display, power_well);
 	else if (display->platform.icelake)
 		return icl_combo_phy_aux_power_well_disable(display,
@@ -1847,10 +1856,11 @@ tgl_tc_cold_off_power_well_is_enabled(struct intel_display *display,
 static void xelpdp_aux_power_well_enable(struct intel_display *display,
 					 struct i915_power_well *power_well)
 {
+	struct intel_encoder *encoder = icl_aux_pw_to_encoder(display, power_well);
 	enum aux_ch aux_ch = i915_power_well_instance(power_well)->xelpdp.aux_ch;
 	enum phy phy = icl_aux_pw_to_phy(display, power_well);
 
-	if (intel_phy_is_tc(display, phy))
+	if (encoder && intel_encoder_is_tc(encoder))
 		icl_tc_port_assert_ref_held(display, power_well,
 					    aux_ch_to_digital_port(display, aux_ch));
 

-- 
2.51.0