drm/i915: Extract opregion vbt presence check

We want to later change intel_opregion_get_vbt to duplicate the vbt
memory if present, which would be an overkill when we just want to
peek into the presence of opregion vbt. Carve out the presence check
into its own function to use in places where only the presence of vbt
is required.

Suggested-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240228213235.2495611-5-radhakrishna.sripada@intel.com

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_opregion.c b/drivers/gpu/drm/i915/display/intel_opregion.c
index 5d07a002edaa..58dfecb617b0 100644
--- a/drivers/gpu/drm/i915/display/intel_opregion.c
+++ b/drivers/gpu/drm/i915/display/intel_opregion.c
@@ -1131,6 +1131,16 @@ const struct drm_edid *intel_opregion_get_edid(struct intel_connector *intel_con
 	return drm_edid;
 }
 
+bool intel_opregion_vbt_present(struct drm_i915_private *i915)
+{
+	struct intel_opregion *opregion = i915->display.opregion;
+
+	if (!opregion || !opregion->vbt)
+		return false;
+
+	return true;
+}
+
 const void *intel_opregion_get_vbt(struct drm_i915_private *i915, size_t *size)
 {
 	struct intel_opregion *opregion = i915->display.opregion;