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Message-ID: <202309090255.4Ttcm8zy-lkp@intel.com>
Date:   Sat, 9 Sep 2023 03:09:46 +0800
From:   kernel test robot <lkp@...el.com>
To:     Gatien Chevallier <gatien.chevallier@...s.st.com>,
        Olivia Mackall <olivia@...enic.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>
Cc:     oe-kbuild-all@...ts.linux.dev,
        Lionel Debieve <lionel.debieve@...s.st.com>,
        linux-crypto@...r.kernel.org, devicetree@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Gatien Chevallier <gatien.chevallier@...s.st.com>
Subject: Re: [PATCH 09/10] hwrng: stm32 - rework power management sequences

Hi Gatien,

kernel test robot noticed the following build warnings:

[auto build test WARNING on atorgue-stm32/stm32-next]
[also build test WARNING on robh/for-next herbert-crypto-2.6/master herbert-cryptodev-2.6/master linus/master v6.5 next-20230908]
[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/Gatien-Chevallier/dt-bindings-rng-introduce-new-compatible-for-STM32MP13x/20230909-005611
base:   https://git.kernel.org/pub/scm/linux/kernel/git/atorgue/stm32.git stm32-next
patch link:    https://lore.kernel.org/r/20230908165120.730867-10-gatien.chevallier%40foss.st.com
patch subject: [PATCH 09/10] hwrng: stm32 - rework power management sequences
config: m68k-allyesconfig (https://download.01.org/0day-ci/archive/20230909/202309090255.4Ttcm8zy-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230909/202309090255.4Ttcm8zy-lkp@intel.com/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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202309090255.4Ttcm8zy-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/char/hw_random/stm32-rng.c:403:12: warning: 'stm32_rng_runtime_resume' defined but not used [-Wunused-function]
     403 | static int stm32_rng_runtime_resume(struct device *dev)
         |            ^~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/char/hw_random/stm32-rng.c:371:12: warning: 'stm32_rng_runtime_suspend' defined but not used [-Wunused-function]
     371 | static int stm32_rng_runtime_suspend(struct device *dev)
         |            ^~~~~~~~~~~~~~~~~~~~~~~~~


vim +/stm32_rng_runtime_resume +403 drivers/char/hw_random/stm32-rng.c

af0d4442dd6813 Lionel Debieve    2019-04-01  370  
c6a97c42e399ad Daniel Thompson   2015-10-12 @371  static int stm32_rng_runtime_suspend(struct device *dev)
c6a97c42e399ad Daniel Thompson   2015-10-12  372  {
d6ba06b8b9a947 Daniel Thompson   2015-10-14  373  	struct stm32_rng_private *priv = dev_get_drvdata(dev);
f81a08733f43ae Gatien Chevallier 2023-09-08  374  	u32 reg;
c6a97c42e399ad Daniel Thompson   2015-10-12  375  
d9494cfe524b05 Gatien Chevallier 2023-09-08  376  	reg = readl_relaxed(priv->base + RNG_CR);
d9494cfe524b05 Gatien Chevallier 2023-09-08  377  	reg &= ~RNG_CR_RNGEN;
d9494cfe524b05 Gatien Chevallier 2023-09-08  378  	writel_relaxed(reg, priv->base + RNG_CR);
d9494cfe524b05 Gatien Chevallier 2023-09-08  379  	clk_disable_unprepare(priv->clk);
c6a97c42e399ad Daniel Thompson   2015-10-12  380  
c6a97c42e399ad Daniel Thompson   2015-10-12  381  	return 0;
c6a97c42e399ad Daniel Thompson   2015-10-12  382  }
c6a97c42e399ad Daniel Thompson   2015-10-12  383  
f81a08733f43ae Gatien Chevallier 2023-09-08  384  static int __maybe_unused stm32_rng_suspend(struct device *dev)
f81a08733f43ae Gatien Chevallier 2023-09-08  385  {
f81a08733f43ae Gatien Chevallier 2023-09-08  386  	struct stm32_rng_private *priv = dev_get_drvdata(dev);
f81a08733f43ae Gatien Chevallier 2023-09-08  387  
f81a08733f43ae Gatien Chevallier 2023-09-08  388  	if (priv->data->has_cond_reset) {
f81a08733f43ae Gatien Chevallier 2023-09-08  389  		priv->pm_conf.nscr = readl_relaxed(priv->base + RNG_NSCR);
f81a08733f43ae Gatien Chevallier 2023-09-08  390  		priv->pm_conf.htcr = readl_relaxed(priv->base + RNG_HTCR);
f81a08733f43ae Gatien Chevallier 2023-09-08  391  	}
f81a08733f43ae Gatien Chevallier 2023-09-08  392  
f81a08733f43ae Gatien Chevallier 2023-09-08  393  	/* Do not save that RNG is enabled as it will be handled at resume */
f81a08733f43ae Gatien Chevallier 2023-09-08  394  	priv->pm_conf.cr = readl_relaxed(priv->base + RNG_CR) & ~RNG_CR_RNGEN;
f81a08733f43ae Gatien Chevallier 2023-09-08  395  
f81a08733f43ae Gatien Chevallier 2023-09-08  396  	writel_relaxed(priv->pm_conf.cr, priv->base + RNG_CR);
f81a08733f43ae Gatien Chevallier 2023-09-08  397  
f81a08733f43ae Gatien Chevallier 2023-09-08  398  	clk_disable_unprepare(priv->clk);
f81a08733f43ae Gatien Chevallier 2023-09-08  399  
f81a08733f43ae Gatien Chevallier 2023-09-08  400  	return 0;
f81a08733f43ae Gatien Chevallier 2023-09-08  401  }
f81a08733f43ae Gatien Chevallier 2023-09-08  402  
c6a97c42e399ad Daniel Thompson   2015-10-12 @403  static int stm32_rng_runtime_resume(struct device *dev)
c6a97c42e399ad Daniel Thompson   2015-10-12  404  {
f81a08733f43ae Gatien Chevallier 2023-09-08  405  	struct stm32_rng_private *priv = dev_get_drvdata(dev);
f81a08733f43ae Gatien Chevallier 2023-09-08  406  	int err;
d9494cfe524b05 Gatien Chevallier 2023-09-08  407  	u32 reg;
f81a08733f43ae Gatien Chevallier 2023-09-08  408  
f81a08733f43ae Gatien Chevallier 2023-09-08  409  	err = clk_prepare_enable(priv->clk);
f81a08733f43ae Gatien Chevallier 2023-09-08  410  	if (err)
f81a08733f43ae Gatien Chevallier 2023-09-08  411  		return err;
f81a08733f43ae Gatien Chevallier 2023-09-08  412  
f81a08733f43ae Gatien Chevallier 2023-09-08  413  	/* Clean error indications */
f81a08733f43ae Gatien Chevallier 2023-09-08  414  	writel_relaxed(0, priv->base + RNG_SR);
f81a08733f43ae Gatien Chevallier 2023-09-08  415  
f81a08733f43ae Gatien Chevallier 2023-09-08  416  	reg = readl_relaxed(priv->base + RNG_CR);
f81a08733f43ae Gatien Chevallier 2023-09-08  417  	reg |= RNG_CR_RNGEN;
f81a08733f43ae Gatien Chevallier 2023-09-08  418  	writel_relaxed(reg, priv->base + RNG_CR);
f81a08733f43ae Gatien Chevallier 2023-09-08  419  
f81a08733f43ae Gatien Chevallier 2023-09-08  420  	return 0;
f81a08733f43ae Gatien Chevallier 2023-09-08  421  }
f81a08733f43ae Gatien Chevallier 2023-09-08  422  

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

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