linux-kernel - Re: [PATCH 4/6] pwm: stm32: Emit debug output also for corner cases of the rounding callbacks

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Message-ID: <202504061207.97zbNPvV-lkp@intel.com>
Date: Sun, 6 Apr 2025 12:58:43 +0800
From: kernel test robot <lkp@...el.com>
To: Uwe Kleine-König <u.kleine-koenig@...libre.com>,
	linux-pwm@...r.kernel.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	Fabrice Gasnier <fabrice.gasnier@...s.st.com>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/6] pwm: stm32: Emit debug output also for corner cases
 of the rounding callbacks

Hi Uwe,

kernel test robot noticed the following build errors:

[auto build test ERROR on e48e99b6edf41c69c5528aa7ffb2daf3c59ee105]

url:    https://github.com/intel-lab-lkp/linux/commits/Uwe-Kleine-K-nig/pwm-Let-pwm_set_waveform-succeed-even-if-lowlevel-driver-rounded-up/20250405-173024
base:   e48e99b6edf41c69c5528aa7ffb2daf3c59ee105
patch link:    https://lore.kernel.org/r/fe154e79319da5ff4159cdc71201a9d3b395e491.1743844730.git.u.kleine-koenig%40baylibre.com
patch subject: [PATCH 4/6] pwm: stm32: Emit debug output also for corner cases of the rounding callbacks
config: x86_64-buildonly-randconfig-001-20250406 (https://download.01.org/0day-ci/archive/20250406/202504061207.97zbNPvV-lkp@intel.com/config)
compiler: clang version 20.1.2 (https://github.com/llvm/llvm-project 58df0ef89dd64126512e4ee27b4ac3fd8ddf6247)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250406/202504061207.97zbNPvV-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/202504061207.97zbNPvV-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/pwm/pwm-stm32.c:246:60: error: use of undeclared identifier 'rate'
     246 |                 pwm->hwpwm, wfhw->ccer, wfhw->psc, wfhw->arr, wfhw->ccr, rate,
         |                                                                          ^
   1 error generated.


vim +/rate +246 drivers/pwm/pwm-stm32.c

   208	
   209	static int stm32_pwm_round_waveform_fromhw(struct pwm_chip *chip,
   210						   struct pwm_device *pwm,
   211						   const void *_wfhw,
   212						   struct pwm_waveform *wf)
   213	{
   214		const struct stm32_pwm_waveform *wfhw = _wfhw;
   215		struct stm32_pwm *priv = to_stm32_pwm_dev(chip);
   216		unsigned int ch = pwm->hwpwm;
   217	
   218		if (wfhw->ccer & TIM_CCER_CCxE(ch + 1)) {
   219			unsigned long rate = clk_get_rate(priv->clk);
   220			u64 ccr_ns;
   221	
   222			/* The result doesn't overflow for rate >= 15259 */
   223			wf->period_length_ns = stm32_pwm_mul_u64_u64_div_u64_roundup(((u64)wfhw->psc + 1) * (wfhw->arr + 1),
   224										     NSEC_PER_SEC, rate);
   225	
   226			ccr_ns = stm32_pwm_mul_u64_u64_div_u64_roundup(((u64)wfhw->psc + 1) * wfhw->ccr,
   227								       NSEC_PER_SEC, rate);
   228	
   229			if (wfhw->ccer & TIM_CCER_CCxP(ch + 1)) {
   230				wf->duty_length_ns =
   231					stm32_pwm_mul_u64_u64_div_u64_roundup(((u64)wfhw->psc + 1) * (wfhw->arr + 1 - wfhw->ccr),
   232									      NSEC_PER_SEC, rate);
   233	
   234				wf->duty_offset_ns = ccr_ns;
   235			} else {
   236				wf->duty_length_ns = ccr_ns;
   237				wf->duty_offset_ns = 0;
   238			}
   239		} else {
   240			*wf = (struct pwm_waveform){
   241				.period_length_ns = 0,
   242			};
   243		}
   244	
   245		dev_dbg(&chip->dev, "pwm#%u: CCER: %08x, PSC: %08x, ARR: %08x, CCR: %08x @%lu -> %lld/%lld [+%lld]\n",
 > 246			pwm->hwpwm, wfhw->ccer, wfhw->psc, wfhw->arr, wfhw->ccr, rate,
   247			wf->duty_length_ns, wf->period_length_ns, wf->duty_offset_ns);
   248	
   249		return 0;
   250	}
   251	

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