bus/fsl-mc: Cache the DPRC API version (993577b2) · Commits · 戴 / test

drivers/bus/fsl-mc/dprc.c

+21 −9

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
		/*
		* Copyright 2013-2016 Freescale Semiconductor Inc.
		* Copyright 2020 NXP
		*
		*/
		#include <linux/kernel.h>
		@@ -8,6 +9,13 @@

		#include "fsl-mc-private.h"

		/*
		* cache the DPRC version to reduce the number of commands
		* towards the mc firmware
		*/
		static u16 dprc_major_ver;
		static u16 dprc_minor_ver;

		/**
		* dprc_open() - Open DPRC object for use
		* @mc_io: Pointer to MC portal's I/O object
		@@ -443,15 +451,19 @@ int dprc_get_obj_region(struct fsl_mc_io *mc_io,
		struct fsl_mc_command cmd = { 0 };
		struct dprc_cmd_get_obj_region *cmd_params;
		struct dprc_rsp_get_obj_region *rsp_params;
		u16 major_ver, minor_ver;
		int err;

		/* prepare command */
		/*
		* If the DPRC object version was not yet cached, cache it now.
		* Otherwise use the already cached value.
		*/
		if (!dprc_major_ver && !dprc_minor_ver) {
		err = dprc_get_api_version(mc_io, 0,
		&major_ver,
		&minor_ver);
		&dprc_major_ver,
		&dprc_minor_ver);
		if (err)
		return err;
		}

		/**
		* MC API version 6.3 introduced a new field to the region
		@@ -459,7 +471,7 @@ int dprc_get_obj_region(struct fsl_mc_io *mc_io,
		* address is set to zero to indicate it needs to be obtained elsewhere
		* (typically the device tree).
		*/
		if (major_ver > 6 \|\| (major_ver == 6 && minor_ver >= 3))
		if (dprc_major_ver > 6 \|\| (dprc_major_ver == 6 && dprc_minor_ver >= 3))
		cmd.header =
		mc_encode_cmd_header(DPRC_CMDID_GET_OBJ_REG_V2,
		cmd_flags, token);
		@@ -483,7 +495,7 @@ int dprc_get_obj_region(struct fsl_mc_io *mc_io,
		rsp_params = (struct dprc_rsp_get_obj_region *)cmd.params;
		region_desc->base_offset = le64_to_cpu(rsp_params->base_offset);
		region_desc->size = le32_to_cpu(rsp_params->size);
		if (major_ver > 6 \|\| (major_ver == 6 && minor_ver >= 3))
		if (dprc_major_ver > 6 \|\| (dprc_major_ver == 6 && dprc_minor_ver >= 3))
		region_desc->base_address = le64_to_cpu(rsp_params->base_addr);
		else
		region_desc->base_address = 0;

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