drm/i915/bios: create fake child devices on missing VBT

Instead of initialing data directly in ddi_port_info array, create fake
child devices for default outputs when the VBT is missing. This makes
further unification of output handling easier.

This will make intel_bios_is_port_present() return true for the fake
child devices. This may cause subtle changes in a handful of places.

Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/91675b40a78bd04bf138598d979661257181880d.1615998927.git.jani.nikula@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_bios.c b/drivers/gpu/drm/i915/display/intel_bios.c
index 218e0da..e028728 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_bios.c
+++ b/drivers/gpu/drm/i915/display/intel_bios.c
@@ -2087,8 +2087,8 @@ init_vbt_missing_defaults(struct drm_i915_private *i915)
                return;
 
        for_each_port_masked(port, ports) {
-               struct ddi_vbt_port_info *info =
-                       &i915->vbt.ddi_port_info[port];
+               struct display_device_data *devdata;
+               struct child_device_config *child;
                enum phy phy = intel_port_to_phy(i915, port);
 
                /*
@@ -2098,11 +2098,38 @@ init_vbt_missing_defaults(struct drm_i915_private *i915)
                if (intel_phy_is_tc(i915, phy))
                        continue;
 
-               info->supports_dvi = (port != PORT_A && port != PORT_E);
-               info->supports_hdmi = info->supports_dvi;
-               info->supports_dp = (port != PORT_E);
-               info->supports_edp = (port == PORT_A);
+               /* Create fake child device config */
+               devdata = kzalloc(sizeof(*devdata), GFP_KERNEL);
+               if (!devdata)
+                       break;
+
+               child = &devdata->child;
+
+               if (port == PORT_F)
+                       child->dvo_port = DVO_PORT_HDMIF;
+               else if (port == PORT_E)
+                       child->dvo_port = DVO_PORT_HDMIE;
+               else
+                       child->dvo_port = DVO_PORT_HDMIA + port;
+
+               if (port != PORT_A && port != PORT_E)
+                       child->device_type |= DEVICE_TYPE_TMDS_DVI_SIGNALING;
+
+               if (port != PORT_E)
+                       child->device_type |= DEVICE_TYPE_DISPLAYPORT_OUTPUT;
+
+               if (port == PORT_A)
+                       child->device_type |= DEVICE_TYPE_INTERNAL_CONNECTOR;
+
+               list_add_tail(&devdata->node, &i915->vbt.display_devices);
+
+               drm_dbg_kms(&i915->drm,
+                           "Generating default VBT child device with type 0x04%x on port %c\n",
+                           child->device_type, port_name(port));
        }
+
+       /* Bypass some minimum baseline VBT version checks */
+       i915->vbt.version = 155;
 }
 
 static const struct bdb_header *get_bdb_header(const struct vbt_header *vbt)
@@ -2279,10 +2306,6 @@ void intel_bios_init(struct drm_i915_private *i915)
        /* Depends on child device list */
        parse_compression_parameters(i915, bdb);
 
-       /* Further processing on pre-parsed data */
-       parse_sdvo_device_mapping(i915);
-       parse_ddi_ports(i915);
-
 out:
        if (!vbt) {
                drm_info(&i915->drm,
@@ -2290,6 +2313,10 @@ out:
                init_vbt_missing_defaults(i915);
        }
 
+       /* Further processing on pre-parsed or generated child device data */
+       parse_sdvo_device_mapping(i915);
+       parse_ddi_ports(i915);
+
        kfree(oprom_vbt);
 }