Merge tag 'drm-intel-next-2021-10-15' of git://anongit.freedesktop.org/drm/drm-intel into drm-next

UAPI Changes:

- No Functional change, but a clarification around I915_TILING values (Matt).

Driver Changes:

- Changes around async flip VT-d w/a (Ville)
- Delete bogus NULL check in intel_ddi_encoder_destroy (Dan)
- DP link training improvements and DP per-lane driver settings (Ville)
- Free the returned object of acpi_evaluate_dsm (Zenghui)
- Fixes and improvements around DP's UHBR and MST (Jani)
- refactor plane config + pin out (Dave)
- remove unused include in intel_dsi_vbt.c (Lucas)
- some code clean up (Lucas, Jani)
- gracefully disable dual eDP (Jani)
- Remove memory frequency calculation (Jose)
- Fix oops on platforms w/o hpd support (Ville)
- Clean up PXP Kconfig info (Rodrigo)

Signed-off-by: Dave Airlie <airlied@redhat.com>

From: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/YWnMORrixyw90O3/@intel.com

1 files changed, 47 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_bios.c b/drivers/gpu/drm/i915/display/intel_bios.c
index f9776ca85de3..b99907c656bb 100644
--- a/drivers/gpu/drm/i915/display/intel_bios.c
+++ b/drivers/gpu/drm/i915/display/intel_bios.c
@@ -1930,6 +1930,50 @@ static int _intel_bios_max_tmds_clock(const struct intel_bios_encoder_data *devd
 	}
 }
 
+static enum port get_edp_port(struct drm_i915_private *i915)
+{
+	const struct intel_bios_encoder_data *devdata;
+	enum port port;
+
+	for_each_port(port) {
+		devdata = i915->vbt.ports[port];
+
+		if (devdata && intel_bios_encoder_supports_edp(devdata))
+			return port;
+	}
+
+	return PORT_NONE;
+}
+
+/*
+ * FIXME: The power sequencer and backlight code currently do not support more
+ * than one set registers, at least not on anything other than VLV/CHV. It will
+ * clobber the registers. As a temporary workaround, gracefully prevent more
+ * than one eDP from being registered.
+ */
+static void sanitize_dual_edp(struct intel_bios_encoder_data *devdata,
+			      enum port port)
+{
+	struct drm_i915_private *i915 = devdata->i915;
+	struct child_device_config *child = &devdata->child;
+	enum port p;
+
+	/* CHV might not clobber PPS registers. */
+	if (IS_CHERRYVIEW(i915))
+		return;
+
+	p = get_edp_port(i915);
+	if (p == PORT_NONE)
+		return;
+
+	drm_dbg_kms(&i915->drm, "both ports %c and %c configured as eDP, "
+		    "disabling port %c eDP\n", port_name(p), port_name(port),
+		    port_name(port));
+
+	child->device_type &= ~DEVICE_TYPE_DISPLAYPORT_OUTPUT;
+	child->device_type &= ~DEVICE_TYPE_INTERNAL_CONNECTOR;
+}
+
 static bool is_port_valid(struct drm_i915_private *i915, enum port port)
 {
 	/*
@@ -1987,6 +2031,9 @@ static void parse_ddi_port(struct drm_i915_private *i915,
 		    supports_typec_usb, supports_tbt,
 		    devdata->dsc != NULL);
 
+	if (is_edp)
+		sanitize_dual_edp(devdata, port);
+
 	if (is_dvi)
 		sanitize_ddc_pin(devdata, port);