drm/i915: Pass size to spi_oprom_get_vbt

spi_oprom_get_vbt will later be used to show the contents of vbt for
which the size of vbt is needed.

Cc: 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/20240228213235.2495611-3-radhakrishna.sripada@intel.com

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

@@ -3007,7 +3007,8 @@ static u32 intel_spi_read(struct intel_uncore *uncore, u32 offset)
 	return intel_uncore_read(uncore, PRIMARY_SPI_TRIGGER);
 }
 
-static struct vbt_header *spi_oprom_get_vbt(struct drm_i915_private *i915)
+static struct vbt_header *spi_oprom_get_vbt(struct drm_i915_private *i915,
+					    size_t *size)
 {
 	u32 count, data, found, store = 0;
 	u32 static_region, oprom_offset;
@@ -3050,6 +3051,9 @@ static struct vbt_header *spi_oprom_get_vbt(struct drm_i915_private *i915)
 
 	drm_dbg_kms(&i915->drm, "Found valid VBT in SPI flash\n");
 
+	if (size)
+		*size = vbt_size;
+
 	return (struct vbt_header *)vbt;
 
 err_free_vbt:
@@ -3155,7 +3159,7 @@ void intel_bios_init(struct drm_i915_private *i915)
 	 * PCI mapping
 	 */
 	if (!vbt && IS_DGFX(i915)) {
-		oprom_vbt = spi_oprom_get_vbt(i915);
+		oprom_vbt = spi_oprom_get_vbt(i915, NULL);
 		vbt = oprom_vbt;
 	}