[PATCH v6 1/8] drm/i915/vbt: Add fields dedicated_external and dyn_port_over_tc

[Matt Atwood <matthew.s.atwood@intel.com>]

From: Gustavo Sousa <gustavo.sousa@intel.com>

VBT version 264 adds new fields associated to Xe3p_LPD's new ways of
configuring SoC for TC ports and PHYs.  Update the code to match the
updates in VBT.

The new field dedicated_external is used to represent TC ports that are
connected to PHYs outside of the Type-C subsystem, meaning that they
behave like dedicated ports and don't require the extra Type-C
programming.  In an upcoming change, we will update the driver to take
this field into consideration when detecting the type of port.

The new field dyn_port_over_tc is used to inform that the TC port can be
dynamically allocated for a legacy connector in the Type-C subsystem,
which is a new feature in Xe3p_LPD.  In upcoming changes, we will use
that field in order to handle the IOM resource management programming
required for that.

Note that, when dedicated_external is set, the fields dp_usb_type_c and
tbt are tagged as "don't care" in the spec, so they should be ignored in
that case, so also add a sanitization function to take care of forcing
them to zero when dedicated_external is true.

v2:
  - Use sanitization function to force dp_usb_type_c and tbt fields to
    be zero instead of adding a
    intel_bios_encoder_is_dedicated_external() check in each of their
    respective accessor functions. (Jani)
  - Print info about dedicated external ports in print_ddi_port().
    (Jani)
v3:
  - Also zero out field dyn_port_over_tc when dedicated_external is set.
    (Imre)
  - Use intel_bios_encoder_is_dedicated_external() directly instead of
    storing return value into variable in print_ddi_port(). (Imre)
  - Also print info for dyn_port_over_tc in print_ddi_port(). (Imre)

Bspec: 20124, 68954, 74304
Cc: Imre Deak <imre.deak@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Shekhar Chauhan <shekhar.chauhan@intel.com>
Signed-off-by: Gustavo Sousa <gustavo.sousa@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
---
 drivers/gpu/drm/i915/display/intel_bios.c     | 73 ++++++++++++++++++-
 drivers/gpu/drm/i915/display/intel_bios.h     |  2 +
 drivers/gpu/drm/i915/display/intel_vbt_defs.h |  3 +-
 3 files changed, 76 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_bios.c b/drivers/gpu/drm/i915/display/intel_bios.c
index a639c5eb3245..ae0b922d5bc3 100644
--- a/drivers/gpu/drm/i915/display/intel_bios.c
+++ b/drivers/gpu/drm/i915/display/intel_bios.c
@@ -2528,6 +2528,54 @@ intel_bios_encoder_reject_edp_rate(const struct intel_bios_encoder_data *devdata
 	return devdata->child.edp_data_rate_override & edp_rate_override_mask(rate);
 }
 
+static void sanitize_dedicated_external(struct intel_bios_encoder_data *devdata,
+					enum port port)
+{
+	struct intel_display *display = devdata->display;
+
+	if (!intel_bios_encoder_is_dedicated_external(devdata))
+		return;
+
+	/*
+	 * Since dedicated_external is for ports connected to PHYs outside of
+	 * the Type-C subsystem, clear bits that would only make sense for ports
+	 * with PHYs in the Type-C subsystem.
+	 */
+
+	/*
+	 * Bit dp_usb_type_c is marked as "don't care" in Bspec when
+	 * dedicated_external is set.
+	 */
+	if (devdata->child.dp_usb_type_c) {
+		drm_dbg_kms(display->drm,
+			    "VBT claims Port %c supports USB Type-C, but the port is dedicated external, ignoring\n",
+			    port_name(port));
+		devdata->child.dp_usb_type_c = 0;
+	}
+
+	/*
+	 * Bit tbt is marked as "don't care" in Bspec when dedicated_external is
+	 * set.
+	 */
+	if (devdata->child.tbt) {
+		drm_dbg_kms(display->drm,
+			    "VBT claims Port %c supports TBT, but the port is dedicated external, ignoring\n",
+			    port_name(port));
+		devdata->child.tbt = 0;
+	}
+
+	/*
+	 * DDI allocation for TC capable ports only make sense for PHYs in the
+	 * Type-C subsystem.
+	 */
+	if (devdata->child.dyn_port_over_tc) {
+		drm_dbg_kms(display->drm,
+			    "VBT claims Port %c supports dynamic DDI allocation in TCSS, but the port is dedicated external, ignoring\n",
+			    port_name(port));
+		devdata->child.dyn_port_over_tc = 0;
+	}
+}
+
 static void sanitize_device_type(struct intel_bios_encoder_data *devdata,
 				 enum port port)
 {
@@ -2692,6 +2740,16 @@ static void print_ddi_port(const struct intel_bios_encoder_data *devdata)
 		    supports_typec_usb, supports_tbt,
 		    devdata->dsc != NULL);
 
+	if (intel_bios_encoder_is_dedicated_external(devdata))
+		drm_dbg_kms(display->drm,
+			    "Port %c is dedicated external\n",
+			    port_name(port));
+
+	if (intel_bios_encoder_supports_dyn_port_over_tc(devdata))
+		drm_dbg_kms(display->drm,
+			    "Port %c supports dynamic DDI allocation in TCSS\n",
+			    port_name(port));
+
 	hdmi_level_shift = intel_bios_hdmi_level_shift(devdata);
 	if (hdmi_level_shift >= 0) {
 		drm_dbg_kms(display->drm,
@@ -2749,6 +2807,7 @@ static void parse_ddi_port(struct intel_bios_encoder_data *devdata)
 		return;
 	}
 
+	sanitize_dedicated_external(devdata, port);
 	sanitize_device_type(devdata, port);
 	sanitize_hdmi_level_shift(devdata, port);
 }
@@ -2776,7 +2835,7 @@ static int child_device_expected_size(u16 version)
 {
 	BUILD_BUG_ON(sizeof(struct child_device_config) < 40);
 
-	if (version > 263)
+	if (version > 264)
 		return -ENOENT;
 	else if (version >= 263)
 		return 44;
@@ -3720,6 +3779,18 @@ bool intel_bios_encoder_supports_tbt(const struct intel_bios_encoder_data *devda
 	return devdata->display->vbt.version >= 209 && devdata->child.tbt;
 }
 
+bool intel_bios_encoder_is_dedicated_external(const struct intel_bios_encoder_data *devdata)
+{
+	return devdata->display->vbt.version >= 264 &&
+		devdata->child.dedicated_external;
+}
+
+bool intel_bios_encoder_supports_dyn_port_over_tc(const struct intel_bios_encoder_data *devdata)
+{
+	return devdata->display->vbt.version >= 264 &&
+		devdata->child.dyn_port_over_tc;
+}
+
 bool intel_bios_encoder_lane_reversal(const struct intel_bios_encoder_data *devdata)
 {
 	return devdata && devdata->child.lane_reversal;
diff --git a/drivers/gpu/drm/i915/display/intel_bios.h b/drivers/gpu/drm/i915/display/intel_bios.h
index f9e438b2787b..75dff27b4228 100644
--- a/drivers/gpu/drm/i915/display/intel_bios.h
+++ b/drivers/gpu/drm/i915/display/intel_bios.h
@@ -79,6 +79,8 @@ bool intel_bios_encoder_supports_dp(const struct intel_bios_encoder_data *devdat
 bool intel_bios_encoder_supports_edp(const struct intel_bios_encoder_data *devdata);
 bool intel_bios_encoder_supports_typec_usb(const struct intel_bios_encoder_data *devdata);
 bool intel_bios_encoder_supports_tbt(const struct intel_bios_encoder_data *devdata);
+bool intel_bios_encoder_is_dedicated_external(const struct intel_bios_encoder_data *devdata);
+bool intel_bios_encoder_supports_dyn_port_over_tc(const struct intel_bios_encoder_data *devdata);
 bool intel_bios_encoder_supports_dsi(const struct intel_bios_encoder_data *devdata);
 bool intel_bios_encoder_supports_dp_dual_mode(const struct intel_bios_encoder_data *devdata);
 bool intel_bios_encoder_is_lspcon(const struct intel_bios_encoder_data *devdata);
diff --git a/drivers/gpu/drm/i915/display/intel_vbt_defs.h b/drivers/gpu/drm/i915/display/intel_vbt_defs.h
index 70e31520c560..57fda5824c9c 100644
--- a/drivers/gpu/drm/i915/display/intel_vbt_defs.h
+++ b/drivers/gpu/drm/i915/display/intel_vbt_defs.h
@@ -554,7 +554,8 @@ struct child_device_config {
 	u8 dvo_function;
 	u8 dp_usb_type_c:1;					/* 195+ */
 	u8 tbt:1;						/* 209+ */
-	u8 flags2_reserved:2;					/* 195+ */
+	u8 dedicated_external:1;				/* 264+ */
+	u8 dyn_port_over_tc:1;					/* 264+ */
 	u8 dp_port_trace_length:4;				/* 209+ */
 	u8 dp_gpio_index;					/* 195+ */
 	u16 dp_gpio_pin_num;					/* 195+ */
-- 
2.51.0