Re: [Patch v3 07/11] cpufreq: tegra194: add OPP support and set bandwidth

[kernel test robot <lkp@intel.com>]

Hi Sumit,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on robh/for-next]
[also build test WARNING on krzk-mem-ctrl/for-next pci/next pci/for-linus]
[cannot apply to tegra/for-next rafael-pm/linux-next linus/master v6.3-rc3 next-20230321]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Sumit-Gupta/firmware-tegra-add-function-to-get-BPMP-data/20230321-024112
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
patch link:    https://lore.kernel.org/r/20230320182441.11904-8-sumitg%40nvidia.com
patch subject: [Patch v3 07/11] cpufreq: tegra194: add OPP support and set bandwidth
config: arm64-allyesconfig (https://download.01.org/0day-ci/archive/20230321/202303211551.eBLRqnv0-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/fa31f117302fc7c15b5d9deeefb8c650554f503d
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Sumit-Gupta/firmware-tegra-add-function-to-get-BPMP-data/20230321-024112
        git checkout fa31f117302fc7c15b5d9deeefb8c650554f503d
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/cpufreq/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202303211551.eBLRqnv0-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/cpufreq/tegra194-cpufreq.c:397:5: warning: no previous prototype for 'tegra_cpufreq_init_cpufreq_table' [-Wmissing-prototypes]
     397 | int tegra_cpufreq_init_cpufreq_table(struct cpufreq_policy *policy,
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/tegra_cpufreq_init_cpufreq_table +397 drivers/cpufreq/tegra194-cpufreq.c

   396	
 > 397	int tegra_cpufreq_init_cpufreq_table(struct cpufreq_policy *policy,
   398					     struct cpufreq_frequency_table *bpmp_lut,
   399					     struct cpufreq_frequency_table **opp_table)
   400	{
   401		struct tegra194_cpufreq_data *data = cpufreq_get_driver_data();
   402		struct cpufreq_frequency_table *freq_table = NULL;
   403		struct cpufreq_frequency_table *pos;
   404		struct device *cpu_dev;
   405		struct dev_pm_opp *opp;
   406		unsigned long rate;
   407		int ret, max_opps;
   408		int j = 0;
   409	
   410		cpu_dev = get_cpu_device(policy->cpu);
   411		if (!cpu_dev) {
   412			pr_err("%s: failed to get cpu%d device\n", __func__, policy->cpu);
   413			return -ENODEV;
   414		}
   415	
   416		/* Initialize OPP table mentioned in operating-points-v2 property in DT */
   417		ret = dev_pm_opp_of_add_table_indexed(cpu_dev, 0);
   418		if (!ret) {
   419			max_opps = dev_pm_opp_get_opp_count(cpu_dev);
   420			if (max_opps <= 0) {
   421				dev_err(cpu_dev, "Failed to add OPPs\n");
   422				return max_opps;
   423			}
   424	
   425			/* Disable all opps and cross-validate against LUT later */
   426			for (rate = 0; ; rate++) {
   427				opp = dev_pm_opp_find_freq_ceil(cpu_dev, &rate);
   428				if (IS_ERR(opp))
   429					break;
   430	
   431				dev_pm_opp_put(opp);
   432				dev_pm_opp_disable(cpu_dev, rate);
   433			}
   434		} else {
   435			dev_err(cpu_dev, "Invalid or empty opp table in device tree\n");
   436			data->icc_dram_bw_scaling = false;
   437			return ret;
   438		}
   439	
   440		freq_table = kcalloc((max_opps + 1), sizeof(*freq_table), GFP_KERNEL);
   441		if (!freq_table)
   442			return -ENOMEM;
   443	
   444		/*
   445		 * Cross check the frequencies from BPMP-FW LUT against the OPP's present in DT.
   446		 * Enable only those DT OPP's which are present in LUT also.
   447		 */
   448		cpufreq_for_each_valid_entry(pos, bpmp_lut) {
   449			opp = dev_pm_opp_find_freq_exact(cpu_dev, pos->frequency * KHZ, false);
   450			if (IS_ERR(opp))
   451				continue;
   452	
   453			ret = dev_pm_opp_enable(cpu_dev, pos->frequency * KHZ);
   454			if (ret < 0)
   455				return ret;
   456	
   457			freq_table[j].driver_data = pos->driver_data;
   458			freq_table[j].frequency = pos->frequency;
   459			j++;
   460		}
   461	
   462		freq_table[j].driver_data = pos->driver_data;
   463		freq_table[j].frequency = CPUFREQ_TABLE_END;
   464	
   465		*opp_table = &freq_table[0];
   466	
   467		dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus);
   468	
   469		return ret;
   470	}
   471	

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