[linux-next:master 8393/10763] drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c:749:10: warning: implicit conversion from 'unsigned long' to 'unsigned int' changes value from 18446744073709551613 to 4294967293

[linux-next:master 8393/10763] drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c:749:10: warning: implicit conversion from 'unsigned long' to 'unsigned int' changes value from 18446744073709551613 to 4294967293

[kernel test robot]

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Hi Swapnil,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   d1d2220c7f39d0fca302c4ba6cca4ede01660a2b
commit: fb43aa0acdfd600c75b8c877bdf9f6e9893ffc9b [8393/10763] drm: bridge: Add support for Cadence MHDP8546 DPI/DP bridge
config: x86_64-randconfig-r031-20200925 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c32e69b2ce7abfb151a87ba363ac9e25abf7d417)
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
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=fb43aa0acdfd600c75b8c877bdf9f6e9893ffc9b
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout fb43aa0acdfd600c75b8c877bdf9f6e9893ffc9b
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c:749:10: warning: implicit conversion from 'unsigned long' to 'unsigned int' changes value from 18446744073709551613 to 4294967293 [-Wconstant-conversion]
                   writel(~CDNS_APB_INT_MASK_SW_EVENT_INT,
                   ~~~~~~ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c:1690:10: warning: implicit conversion from 'unsigned long' to 'unsigned int' changes value from 18446744073709551613 to 4294967293 [-Wconstant-conversion]
                   writel(~CDNS_APB_INT_MASK_SW_EVENT_INT,
                   ~~~~~~ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c:2123:10: warning: implicit conversion from 'unsigned long' to 'unsigned int' changes value from 18446744073709551613 to 4294967293 [-Wconstant-conversion]
                   writel(~CDNS_APB_INT_MASK_SW_EVENT_INT,
                   ~~~~~~ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   3 warnings generated.

vim +749 drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c

   692	
   693	static int cdns_mhdp_fw_activate(const struct firmware *fw,
   694					 struct cdns_mhdp_device *mhdp)
   695	{
   696		unsigned int reg;
   697		int ret;
   698	
   699		/* Release uCPU reset and stall it. */
   700		writel(CDNS_CPU_STALL, mhdp->regs + CDNS_APB_CTRL);
   701	
   702		memcpy_toio(mhdp->regs + CDNS_MHDP_IMEM, fw->data, fw->size);
   703	
   704		/* Leave debug mode, release stall */
   705		writel(0, mhdp->regs + CDNS_APB_CTRL);
   706	
   707		/*
   708		 * Wait for the KEEP_ALIVE "message" on the first 8 bits.
   709		 * Updated each sched "tick" (~2ms)
   710		 */
   711		ret = readl_poll_timeout(mhdp->regs + CDNS_KEEP_ALIVE, reg,
   712					 reg & CDNS_KEEP_ALIVE_MASK, 500,
   713					 CDNS_KEEP_ALIVE_TIMEOUT);
   714		if (ret) {
   715			dev_err(mhdp->dev,
   716				"device didn't give any life sign: reg %d\n", reg);
   717			return ret;
   718		}
   719	
   720		ret = cdns_mhdp_check_fw_version(mhdp);
   721		if (ret)
   722			return ret;
   723	
   724		/* Init events to 0 as it's not cleared by FW at boot but on read */
   725		readl(mhdp->regs + CDNS_SW_EVENT0);
   726		readl(mhdp->regs + CDNS_SW_EVENT1);
   727		readl(mhdp->regs + CDNS_SW_EVENT2);
   728		readl(mhdp->regs + CDNS_SW_EVENT3);
   729	
   730		/* Activate uCPU */
   731		ret = cdns_mhdp_set_firmware_active(mhdp, true);
   732		if (ret)
   733			return ret;
   734	
   735		spin_lock(&mhdp->start_lock);
   736	
   737		mhdp->hw_state = MHDP_HW_READY;
   738	
   739		/*
   740		 * Here we must keep the lock while enabling the interrupts
   741		 * since it would otherwise be possible that interrupt enable
   742		 * code is executed after the bridge is detached. The similar
   743		 * situation is not possible in attach()/detach() callbacks
   744		 * since the hw_state changes from MHDP_HW_READY to
   745		 * MHDP_HW_STOPPED happens only due to driver removal when
   746		 * bridge should already be detached.
   747		 */
   748		if (mhdp->bridge_attached)
 > 749			writel(~CDNS_APB_INT_MASK_SW_EVENT_INT,
   750			       mhdp->regs + CDNS_APB_INT_MASK);
   751	
   752		spin_unlock(&mhdp->start_lock);
   753	
   754		wake_up(&mhdp->fw_load_wq);
   755		dev_dbg(mhdp->dev, "DP FW activated\n");
   756	
   757		return 0;
   758	}
   759	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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