Re: [PATCH v1 3/3] PCI: qcom: Add OPP suuport for speed based performance state of RPMH

[kernel test robot]

Hi Krishna,

kernel test robot noticed the following build warnings:

[auto build test WARNING on pci/for-linus]
[also build test WARNING on robh/for-next linus/master v6.5-rc6 next-20230809]
[cannot apply to pci/next]
[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/Krishna-chaitanya-chundru/dt-bindings-pci-qcom-Add-binding-for-operating-points-v2/20230815-203103
base:   https://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git for-linus
patch link:    https://lore.kernel.org/r/1692102408-7010-4-git-send-email-quic_krichai%40quicinc.com
patch subject: [PATCH v1 3/3] PCI: qcom: Add OPP suuport for speed based performance state of RPMH
config: loongarch-allyesconfig (https://download.01.org/0day-ci/archive/20230815/202308152125.sU1aQfAd-lkp@xxxxxxxxx/config)
compiler: loongarch64-linux-gcc (GCC) 12.3.0
reproduce: (https://download.01.org/0day-ci/archive/20230815/202308152125.sU1aQfAd-lkp@xxxxxxxxx/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202308152125.sU1aQfAd-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

   drivers/pci/controller/dwc/pcie-qcom.c: In function 'qcom_pcie_opp_update':
>> drivers/pci/controller/dwc/pcie-qcom.c:1368:13: warning: variable 'ret' set but not used [-Wunused-but-set-variable]
    1368 |         int ret = 0;
         |             ^~~


vim +/ret +1368 drivers/pci/controller/dwc/pcie-qcom.c

  1360	
  1361	static void qcom_pcie_opp_update(struct qcom_pcie *pcie)
  1362	{
  1363		struct dw_pcie *pci = pcie->pci;
  1364		struct dev_pm_opp *opp;
  1365		u32 offset, status;
  1366		uint32_t freq;
  1367		int speed;
> 1368		int ret = 0;
  1369	
  1370		offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
  1371		status = readw(pci->dbi_base + offset + PCI_EXP_LNKSTA);
  1372	
  1373		/* Only update constraints if link is up. */
  1374		if (!(status & PCI_EXP_LNKSTA_DLLLA))
  1375			return;
  1376	
  1377		speed = FIELD_GET(PCI_EXP_LNKSTA_CLS, status);
  1378	
  1379		switch (speed) {
  1380		case 1:
  1381			freq = 2500000;
  1382			break;
  1383		case 2:
  1384			freq = 5000000;
  1385			break;
  1386		case 3:
  1387			freq = 8000000;
  1388			break;
  1389		default:
  1390			WARN_ON_ONCE(1);
  1391			fallthrough;
  1392		case 4:
  1393			freq = 16000000;
  1394			break;
  1395		}
  1396	
  1397		opp = dev_pm_opp_find_freq_exact(pci->dev, freq, true);
  1398	
  1399		if (!IS_ERR(opp)) {
  1400			ret = dev_pm_opp_get_voltage(opp);
  1401			dev_pm_opp_put(opp);
  1402		}
  1403	

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