drm/i915: Try to initialize DDI/ICL+ DSI ports for every VBT child device

Try to deal with duplicate child devices for the same DDI port
by attempting to initialize them in VBT defined order The first
on to succeed for a specific DDI port will be the one we use.

We'll also get rid of i915->display.vbt.ports[] here as any conflicts
will now be handled at encoder registration time rather than during
VBT parsing. Note that intel_bios_encoder_data_lookup() still remaims
for pre-DDI DP/HDMI ports as those don't (at least yet) use VBT
driven initialization.

TODO: DSI dual link handling is sketchy at best

v2: Leave intel_bios_encoder_port() to the encoder callback (Jani)

Cc: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230630155846.29931-7-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/display/icl_dsi.c

@@ -1933,7 +1933,8 @@ static void icl_dsi_add_properties(struct intel_connector *connector)
 						       fixed_mode->vdisplay);
 }
 
-void icl_dsi_init(struct drm_i915_private *dev_priv)
+void icl_dsi_init(struct drm_i915_private *dev_priv,
+		  const struct intel_bios_encoder_data *devdata)
 {
 	struct intel_dsi *intel_dsi;
 	struct intel_encoder *encoder;
@@ -1941,7 +1942,8 @@ void icl_dsi_init(struct drm_i915_private *dev_priv)
 	struct drm_connector *connector;
 	enum port port;
 
-	if (!intel_bios_is_dsi_present(dev_priv, &port))
+	port = intel_bios_encoder_port(devdata);
+	if (port == PORT_NONE)
 		return;
 
 	intel_dsi = kzalloc(sizeof(*intel_dsi), GFP_KERNEL);
@@ -1958,6 +1960,8 @@ void icl_dsi_init(struct drm_i915_private *dev_priv)
 	intel_dsi->attached_connector = intel_connector;
 	connector = &intel_connector->base;
 
+	encoder->devdata = devdata;
+
 	/* register DSI encoder with DRM subsystem */
 	drm_encoder_init(&dev_priv->drm, &encoder->base, &gen11_dsi_encoder_funcs,
 			 DRM_MODE_ENCODER_DSI, "DSI %c", port_name(port));
@@ -1995,7 +1999,6 @@ void icl_dsi_init(struct drm_i915_private *dev_priv)
 
 	intel_dsi->panel_power_off_time = ktime_get_boottime();
 
-	encoder->devdata = intel_bios_encoder_data_lookup(dev_priv, port);
 	intel_bios_init_panel_late(dev_priv, &intel_connector->panel, encoder->devdata, NULL);
 
 	mutex_lock(&dev_priv->drm.mode_config.mutex);

drivers/gpu/drm/i915/display/icl_dsi.h

@@ -7,9 +7,11 @@
 #define __ICL_DSI_H__
 
 struct drm_i915_private;
+struct intel_bios_encoder_data;
 struct intel_crtc_state;
 
-void icl_dsi_init(struct drm_i915_private *i915);
+void icl_dsi_init(struct drm_i915_private *dev_priv,
+		  const struct intel_bios_encoder_data *devdata);
 void icl_dsi_frame_update(struct intel_crtc_state *crtc_state);
 
 #endif /* __ICL_DSI_H__ */

drivers/gpu/drm/i915/display/intel_bios.c

@@ -2374,7 +2374,7 @@ dsi_dvo_port_to_port(struct drm_i915_private *i915, u8 dvo_port)
 	}
 }
 
-static enum port intel_bios_encoder_port(const struct intel_bios_encoder_data *devdata)
+enum port intel_bios_encoder_port(const struct intel_bios_encoder_data *devdata)
 {
 	struct drm_i915_private *i915 = devdata->i915;
 	const struct child_device_config *child = &devdata->child;
@@ -2497,7 +2497,7 @@ intel_bios_encoder_supports_edp(const struct intel_bios_encoder_data *devdata)
 		devdata->child.device_type & DEVICE_TYPE_INTERNAL_CONNECTOR;
 }
 
-static bool
+bool
 intel_bios_encoder_supports_dsi(const struct intel_bios_encoder_data *devdata)
 {
 	return devdata->child.device_type & DEVICE_TYPE_MIPI_OUTPUT;
@@ -2556,13 +2556,17 @@ static bool is_port_valid(struct drm_i915_private *i915, enum port port)
 	return true;
 }
 
-static void print_ddi_port(const struct intel_bios_encoder_data *devdata,
-			   enum port port)
+static void print_ddi_port(const struct intel_bios_encoder_data *devdata)
 {
 	struct drm_i915_private *i915 = devdata->i915;
 	const struct child_device_config *child = &devdata->child;
 	bool is_dvi, is_hdmi, is_dp, is_edp, is_dsi, is_crt, supports_typec_usb, supports_tbt;
 	int dp_boost_level, dp_max_link_rate, hdmi_boost_level, hdmi_level_shift, max_tmds_clock;
+	enum port port;
+
+	port = intel_bios_encoder_port(devdata);
+	if (port == PORT_NONE)
+		return;
 
 	is_dvi = intel_bios_encoder_supports_dvi(devdata);
 	is_dp = intel_bios_encoder_supports_dp(devdata);
@@ -2639,16 +2643,7 @@ static void parse_ddi_port(struct intel_bios_encoder_data *devdata)
 		return;
 	}
 
-	if (i915->display.vbt.ports[port]) {
-		drm_dbg_kms(&i915->drm,
-			    "More than one child device for port %c in VBT, using the first.\n",
-			    port_name(port));
-		return;
-	}
-
 	sanitize_device_type(devdata, port);
-
-	i915->display.vbt.ports[port] = devdata;
 }
 
 static bool has_ddi_port_info(struct drm_i915_private *i915)
@@ -2659,7 +2654,6 @@ static bool has_ddi_port_info(struct drm_i915_private *i915)
 static void parse_ddi_ports(struct drm_i915_private *i915)
 {
 	struct intel_bios_encoder_data *devdata;
-	enum port port;
 
 	if (!has_ddi_port_info(i915))
 		return;
@@ -2667,10 +2661,8 @@ static void parse_ddi_ports(struct drm_i915_private *i915)
 	list_for_each_entry(devdata, &i915->display.vbt.display_devices, node)
 		parse_ddi_port(devdata);
 
-	for_each_port(port) {
-		if (i915->display.vbt.ports[port])
-			print_ddi_port(i915->display.vbt.ports[port], port);
-	}
+	list_for_each_entry(devdata, &i915->display.vbt.display_devices, node)
+		print_ddi_port(devdata);
 }
 
 static void
@@ -3595,5 +3587,22 @@ bool intel_bios_encoder_hpd_invert(const struct intel_bios_encoder_data *devdata
 const struct intel_bios_encoder_data *
 intel_bios_encoder_data_lookup(struct drm_i915_private *i915, enum port port)
 {
-	return i915->display.vbt.ports[port];
+	struct intel_bios_encoder_data *devdata;
+
+	list_for_each_entry(devdata, &i915->display.vbt.display_devices, node) {
+		if (intel_bios_encoder_port(devdata) == port)
+			return devdata;
+	}
+
+	return NULL;
+}
+
+void intel_bios_for_each_encoder(struct drm_i915_private *i915,
+				 void (*func)(struct drm_i915_private *i915,
+					      const struct intel_bios_encoder_data *devdata))
+{
+	struct intel_bios_encoder_data *devdata;
+
+	list_for_each_entry(devdata, &i915->display.vbt.display_devices, node)
+		func(i915, devdata);
 }

drivers/gpu/drm/i915/display/intel_bios.h

@@ -263,10 +263,12 @@ 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_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);
 bool intel_bios_encoder_lane_reversal(const struct intel_bios_encoder_data *devdata);
 bool intel_bios_encoder_hpd_invert(const struct intel_bios_encoder_data *devdata);
+enum port intel_bios_encoder_port(const struct intel_bios_encoder_data *devdata);
 enum aux_ch intel_bios_dp_aux_ch(const struct intel_bios_encoder_data *devdata);
 int intel_bios_dp_boost_level(const struct intel_bios_encoder_data *devdata);
 int intel_bios_dp_max_lane_count(const struct intel_bios_encoder_data *devdata);
@@ -276,4 +278,8 @@ int intel_bios_hdmi_ddc_pin(const struct intel_bios_encoder_data *devdata);
 int intel_bios_hdmi_level_shift(const struct intel_bios_encoder_data *devdata);
 int intel_bios_hdmi_max_tmds_clock(const struct intel_bios_encoder_data *devdata);
 
+void intel_bios_for_each_encoder(struct drm_i915_private *i915,
+				 void (*func)(struct drm_i915_private *i915,
+					      const struct intel_bios_encoder_data *devdata));
+
 #endif /* _INTEL_BIOS_H_ */

drivers/gpu/drm/i915/display/intel_ddi.c

@@ -32,6 +32,7 @@
 
 #include "i915_drv.h"
 #include "i915_reg.h"
+#include "icl_dsi.h"
 #include "intel_audio.h"
 #include "intel_audio_regs.h"
 #include "intel_backlight.h"
@@ -4684,13 +4685,38 @@ static bool need_aux_ch(struct intel_encoder *encoder, bool init_dp)
 	return init_dp || intel_phy_is_tc(i915, phy);
 }
 
-void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port)
+static bool assert_has_icl_dsi(struct drm_i915_private *i915)
+{
+	return !drm_WARN(&i915->drm, !IS_ALDERLAKE_P(i915) &&
+			 !IS_TIGERLAKE(i915) && DISPLAY_VER(i915) != 11,
+			 "Platform does not support DSI\n");
+}
+
+static bool port_in_use(struct drm_i915_private *i915, enum port port)
+{
+	struct intel_encoder *encoder;
+
+	for_each_intel_encoder(&i915->drm, encoder) {
+		/* FIXME what about second port for dual link DSI? */
+		if (encoder->port == port)
+			return true;
+	}
+
+	return false;
+}
+
+void intel_ddi_init(struct drm_i915_private *dev_priv,
+		    const struct intel_bios_encoder_data *devdata)
 {
 	struct intel_digital_port *dig_port;
 	struct intel_encoder *encoder;
-	const struct intel_bios_encoder_data *devdata;
 	bool init_hdmi, init_dp;
-	enum phy phy = intel_port_to_phy(dev_priv, port);
+	enum port port;
+	enum phy phy;
+
+	port = intel_bios_encoder_port(devdata);
+	if (port == PORT_NONE)
+		return;
 
 	if (!port_strap_detected(dev_priv, port)) {
 		drm_dbg_kms(&dev_priv->drm,
@@ -4701,6 +4727,23 @@ void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port)
 	if (!assert_port_valid(dev_priv, port))
 		return;
 
+	if (port_in_use(dev_priv, port)) {
+		drm_dbg_kms(&dev_priv->drm,
+			    "Port %c already claimed\n", port_name(port));
+		return;
+	}
+
+	if (intel_bios_encoder_supports_dsi(devdata)) {
+		/* BXT/GLK handled elsewhere, for now at least */
+		if (!assert_has_icl_dsi(dev_priv))
+			return;
+
+		icl_dsi_init(dev_priv, devdata);
+		return;
+	}
+
+	phy = intel_port_to_phy(dev_priv, port);
+
 	/*
 	 * On platforms with HTI (aka HDPORT), if it's enabled at boot it may
 	 * have taken over some of the PHYs and made them unavailable to the
@@ -4713,14 +4756,6 @@ void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port)
 		return;
 	}
 
-	devdata = intel_bios_encoder_data_lookup(dev_priv, port);
-	if (!devdata) {
-		drm_dbg_kms(&dev_priv->drm,
-			    "VBT says port %c is not present\n",
-			    port_name(port));
-		return;
-	}
-
 	init_hdmi = intel_bios_encoder_supports_dvi(devdata) ||
 		intel_bios_encoder_supports_hdmi(devdata);
 	init_dp = intel_bios_encoder_supports_dp(devdata);

drivers/gpu/drm/i915/display/intel_ddi.h

@@ -11,6 +11,7 @@
 struct drm_connector_state;
 struct drm_i915_private;
 struct intel_atomic_state;
+struct intel_bios_encoder_data;
 struct intel_connector;
 struct intel_crtc;
 struct intel_crtc_state;
@@ -50,7 +51,8 @@ void hsw_prepare_dp_ddi_buffers(struct intel_encoder *encoder,
 				const struct intel_crtc_state *crtc_state);
 void intel_wait_ddi_buf_idle(struct drm_i915_private *dev_priv,
 			     enum port port);
-void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port);
+void intel_ddi_init(struct drm_i915_private *dev_priv,
+		    const struct intel_bios_encoder_data *devdata);
 bool intel_ddi_get_hw_state(struct intel_encoder *encoder, enum pipe *pipe);
 void intel_ddi_enable_transcoder_func(struct intel_encoder *encoder,
 				      const struct intel_crtc_state *crtc_state);

drivers/gpu/drm/i915/display/intel_display.c

@@ -53,7 +53,6 @@
 #include "i915_utils.h"
 #include "i9xx_plane.h"
 #include "i9xx_wm.h"
-#include "icl_dsi.h"
 #include "intel_atomic.h"
 #include "intel_atomic_plane.h"
 #include "intel_audio.h"
@@ -7412,18 +7411,10 @@ void intel_setup_outputs(struct drm_i915_private *dev_priv)
 		return;
 
 	if (HAS_DDI(dev_priv)) {
-		enum port port;
-
 		if (intel_ddi_crt_present(dev_priv))
 			intel_crt_init(dev_priv);
 
-		for_each_port_masked(port, DISPLAY_RUNTIME_INFO(dev_priv)->port_mask)
-			intel_ddi_init(dev_priv, port);
-
-		/* FIXME do something about DSI */
-		if (IS_ALDERLAKE_P(dev_priv) || IS_TIGERLAKE(dev_priv) ||
-		    DISPLAY_VER(dev_priv) == 11)
-			icl_dsi_init(dev_priv);
+		intel_bios_for_each_encoder(dev_priv, intel_ddi_init);
 
 		if (IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv))
 			vlv_dsi_init(dev_priv);

drivers/gpu/drm/i915/display/intel_display_core.h

@@ -34,7 +34,6 @@ struct i915_audio_component;
 struct i915_hdcp_arbiter;
 struct intel_atomic_state;
 struct intel_audio_funcs;
-struct intel_bios_encoder_data;
 struct intel_cdclk_funcs;
 struct intel_cdclk_vals;
 struct intel_color_funcs;
@@ -219,7 +218,6 @@ struct intel_vbt_data {
 	struct list_head display_devices;
 	struct list_head bdb_blocks;
 
-	struct intel_bios_encoder_data *ports[I915_MAX_PORTS]; /* Non-NULL if port present. */
 	struct sdvo_device_mapping {
 		u8 initialized;
 		u8 dvo_port;