[Intel-gfx] [PATCH 1/2] drm/i915/opregion: add function to check if headless sku

[Jouni Högander]

Export headless sku bit (bit 13) from opregion->header->pcon as an
interface to check if our device is headless configuration.

Bspec: 53441
Signed-off-by: Jouni Högander <jouni.hogander at intel.com>
---
 drivers/gpu/drm/i915/display/intel_opregion.c | 12 ++++++++++++
 drivers/gpu/drm/i915/display/intel_opregion.h |  7 +++++++
 2 files changed, 19 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_opregion.c b/drivers/gpu/drm/i915/display/intel_opregion.c
index f31e8c3f8ce0..eab3f2e6b786 100644
--- a/drivers/gpu/drm/i915/display/intel_opregion.c
+++ b/drivers/gpu/drm/i915/display/intel_opregion.c
@@ -53,6 +53,8 @@
 #define MBOX_ASLE_EXT		BIT(4)	/* Mailbox #5 */
 #define MBOX_BACKLIGHT		BIT(5)	/* Mailbox #2 (valid from v3.x) */
 
+#define PCON_HEADLESS_SKU	BIT(13)
+
 struct opregion_header {
 	u8 signature[16];
 	u32 size;
@@ -1135,6 +1137,16 @@ struct edid *intel_opregion_get_edid(struct intel_connector *intel_connector)
 	return new_edid;
 }
 
+bool intel_opregion_headless_sku(struct drm_i915_private *i915)
+{
+	struct intel_opregion *opregion = &i915->opregion;
+
+	if (!opregion->header)
+		return false;
+
+	return opregion->header->pcon & PCON_HEADLESS_SKU;
+}
+
 void intel_opregion_register(struct drm_i915_private *i915)
 {
 	struct intel_opregion *opregion = &i915->opregion;
diff --git a/drivers/gpu/drm/i915/display/intel_opregion.h b/drivers/gpu/drm/i915/display/intel_opregion.h
index 82cc0ba34af7..5ad96e1d8278 100644
--- a/drivers/gpu/drm/i915/display/intel_opregion.h
+++ b/drivers/gpu/drm/i915/display/intel_opregion.h
@@ -76,6 +76,8 @@ int intel_opregion_notify_adapter(struct drm_i915_private *dev_priv,
 int intel_opregion_get_panel_type(struct drm_i915_private *dev_priv);
 struct edid *intel_opregion_get_edid(struct intel_connector *connector);
 
+bool intel_opregion_headless_sku(struct drm_i915_private *i915);
+
 #else /* CONFIG_ACPI*/
 
 static inline int intel_opregion_setup(struct drm_i915_private *dev_priv)
@@ -127,6 +129,11 @@ intel_opregion_get_edid(struct intel_connector *connector)
 	return NULL;
 }
 
+bool intel_opregion_headless_sku(struct drm_i915_private *i915)
+{
+	return false;
+}
+
 #endif /* CONFIG_ACPI */
 
 #endif
-- 
2.25.1