linux-firmware: add Intel CPU-integrated GPU (iGPU) firmware

On latest Intel x86 CPUs, DMC firmware is required for the iGPU to reach
its lowest power states. If the driver cannot load it, it will print a
warning and unnecessarily make the iGPU draw a bit more power when idle.

GUC firmware (various "offload" mechanisms that deal with scheduling GPU
workloads) and HUC firmware (required for accelerated media codec
operations for HEVC/H.265) are probably more niche, but could also
provde useful for some - for example, when building an
Intel/OpenWrt-based security camera.

Signed-off-by: Johannes Truschnigg <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/16069
Signed-off-by: Hauke Mehrtens <[email protected]>

package/firmware/linux-firmware/intel.mk

@@ -215,3 +215,30 @@ define Package/e100-firmware/install
 	$(INSTALL_DATA) $(PKG_BUILD_DIR)/e100/d102e_ucode.bin $(1)/lib/firmware/e100/
 endef
 $(eval $(call BuildPackage,e100-firmware))
+
+Package/intel-igpu-firmware-dmc = $(call Package/firmware-default,Intel iGPU DMC Display MC firmware)
+define Package/intel-igpu-firmware-dmc/install
+	$(INSTALL_DIR) $(1)/lib/firmware/i915
+	$(CP) \
+		$(PKG_BUILD_DIR)/i915/*_dmc_*.bin* \
+		$(1)/lib/firmware/i915/
+endef
+$(eval $(call BuildPackage,intel-igpu-firmware-dmc))
+
+Package/intel-igpu-firmware-guc = $(call Package/firmware-default,Intel iGPU GUC Graphics MC firmware)
+define Package/intel-igpu-firmware-guc/install
+	$(INSTALL_DIR) $(1)/lib/firmware/i915
+	$(CP) \
+		$(PKG_BUILD_DIR)/i915/*_guc_*.bin* \
+		$(1)/lib/firmware/i915/
+endef
+$(eval $(call BuildPackage,intel-igpu-firmware-guc))
+
+Package/intel-igpu-firmware-huc = $(call Package/firmware-default,Intel iGPU HUC H.265 MC firmware)
+define Package/intel-igpu-firmware-huc/install
+	$(INSTALL_DIR) $(1)/lib/firmware/i915
+	$(CP) \
+		$(PKG_BUILD_DIR)/i915/*_huc_*.bin* \
+		$(1)/lib/firmware/i915/
+endef
+$(eval $(call BuildPackage,intel-igpu-firmware-huc))