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Message-ID: <202504231136.Cr4O6Zg5-lkp@intel.com>
Date: Wed, 23 Apr 2025 12:08:40 +0800
From: kernel test robot <lkp@...el.com>
To: Nylon Chen <nylon.chen@...ive.com>, Conor Dooley <conor@...nel.org>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk@...nel.org>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Samuel Holland <samuel.holland@...ive.com>,
Uwe Kleine-König <ukleinek@...nel.org>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-pwm@...r.kernel.org,
Nylon Chen <nylon.chen@...ive.com>, Zong Li <zong.li@...ive.com>
Subject: Re: [PATCH v12 4/5] pwm: sifive: Fix rounding issues in apply and
get_state functions
Hi Nylon,
kernel test robot noticed the following build errors:
[auto build test ERROR on robh/for-next]
[also build test ERROR on linus/master v6.15-rc3 next-20250422]
[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/Nylon-Chen/riscv-dts-sifive-unleashed-unmatched-Remove-PWM-controlled-LED-s-active-low-properties/20250422-165644
base: https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
patch link: https://lore.kernel.org/r/20250422085312.812877-5-nylon.chen%40sifive.com
patch subject: [PATCH v12 4/5] pwm: sifive: Fix rounding issues in apply and get_state functions
config: arm-randconfig-004-20250423 (https://download.01.org/0day-ci/archive/20250423/202504231136.Cr4O6Zg5-lkp@intel.com/config)
compiler: clang version 21.0.0git (https://github.com/llvm/llvm-project f819f46284f2a79790038e1f6649172789734ae8)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250423/202504231136.Cr4O6Zg5-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/202504231136.Cr4O6Zg5-lkp@intel.com/
All errors (new ones prefixed by >>):
>> drivers/pwm/pwm-sifive.c:161:2: error: unterminated function-like macro invocation
161 | do_div(frac, state->period;
| ^
include/asm-generic/div64.h:180:10: note: macro 'do_div' defined here
180 | # define do_div(n,base) ({ \
| ^
>> drivers/pwm/pwm-sifive.c:351:26: error: expected '}'
351 | MODULE_LICENSE("GPL v2");
| ^
drivers/pwm/pwm-sifive.c:134:1: note: to match this '{'
134 | {
| ^
2 errors generated.
vim +161 drivers/pwm/pwm-sifive.c
131
132 static int pwm_sifive_apply(struct pwm_chip *chip, struct pwm_device *pwm,
133 const struct pwm_state *state)
134 {
135 struct pwm_sifive_ddata *ddata = pwm_sifive_chip_to_ddata(chip);
136 struct pwm_state cur_state;
137 unsigned int duty_cycle;
138 unsigned long long num;
139 bool enabled;
140 int ret = 0;
141 u32 frac, inactive;
142
143 if (state->polarity != PWM_POLARITY_NORMAL)
144 return -EINVAL;
145
146 cur_state = pwm->state;
147 enabled = cur_state.enabled;
148
149 duty_cycle = state->duty_cycle;
150 if (!state->enabled)
151 duty_cycle = 0;
152
153 /*
154 * The problem of output producing mixed setting as mentioned at top,
155 * occurs here. To minimize the window for this problem, we are
156 * calculating the register values first and then writing them
157 * consecutively
158 */
159 num = (u64)duty_cycle * (1U << PWM_SIFIVE_CMPWIDTH);
160 frac = num;
> 161 do_div(frac, state->period;
162 /* The hardware cannot generate a 0% duty cycle */
163 frac = min(frac, (1U << PWM_SIFIVE_CMPWIDTH) - 1);
164 inactive = (1U << PWM_SIFIVE_CMPWIDTH) - 1 - frac;
165
166 mutex_lock(&ddata->lock);
167 if (state->period != ddata->approx_period) {
168 /*
169 * Don't let a 2nd user change the period underneath the 1st user.
170 * However if ddate->approx_period == 0 this is the first time we set
171 * any period, so let whoever gets here first set the period so other
172 * users who agree on the period won't fail.
173 */
174 if (ddata->user_count != 1 && ddata->approx_period) {
175 mutex_unlock(&ddata->lock);
176 return -EBUSY;
177 }
178 ddata->approx_period = state->period;
179 pwm_sifive_update_clock(ddata, clk_get_rate(ddata->clk));
180 }
181 mutex_unlock(&ddata->lock);
182
183 /*
184 * If the PWM is enabled the clk is already on. So only enable it
185 * conditionally to have it on exactly once afterwards independent of
186 * the PWM state.
187 */
188 if (!enabled) {
189 ret = clk_enable(ddata->clk);
190 if (ret) {
191 dev_err(pwmchip_parent(chip), "Enable clk failed\n");
192 return ret;
193 }
194 }
195
196 writel(inactive, ddata->regs + PWM_SIFIVE_PWMCMP(pwm->hwpwm));
197
198 if (!state->enabled)
199 clk_disable(ddata->clk);
200
201 return 0;
202 }
203
204 static const struct pwm_ops pwm_sifive_ops = {
205 .request = pwm_sifive_request,
206 .free = pwm_sifive_free,
207 .get_state = pwm_sifive_get_state,
208 .apply = pwm_sifive_apply,
209 };
210
211 static int pwm_sifive_clock_notifier(struct notifier_block *nb,
212 unsigned long event, void *data)
213 {
214 struct clk_notifier_data *ndata = data;
215 struct pwm_sifive_ddata *ddata =
216 container_of(nb, struct pwm_sifive_ddata, notifier);
217
218 if (event == POST_RATE_CHANGE) {
219 mutex_lock(&ddata->lock);
220 pwm_sifive_update_clock(ddata, ndata->new_rate);
221 mutex_unlock(&ddata->lock);
222 }
223
224 return NOTIFY_OK;
225 }
226
227 static int pwm_sifive_probe(struct platform_device *pdev)
228 {
229 struct device *dev = &pdev->dev;
230 struct pwm_sifive_ddata *ddata;
231 struct pwm_chip *chip;
232 int ret;
233 u32 val;
234 unsigned int enabled_pwms = 0, enabled_clks = 1;
235
236 chip = devm_pwmchip_alloc(dev, 4, sizeof(*ddata));
237 if (IS_ERR(chip))
238 return PTR_ERR(chip);
239
240 ddata = pwm_sifive_chip_to_ddata(chip);
241 ddata->parent = dev;
242 mutex_init(&ddata->lock);
243 chip->ops = &pwm_sifive_ops;
244
245 ddata->regs = devm_platform_ioremap_resource(pdev, 0);
246 if (IS_ERR(ddata->regs))
247 return PTR_ERR(ddata->regs);
248
249 ddata->clk = devm_clk_get_prepared(dev, NULL);
250 if (IS_ERR(ddata->clk))
251 return dev_err_probe(dev, PTR_ERR(ddata->clk),
252 "Unable to find controller clock\n");
253
254 ret = clk_enable(ddata->clk);
255 if (ret) {
256 dev_err(dev, "failed to enable clock for pwm: %d\n", ret);
257 return ret;
258 }
259
260 val = readl(ddata->regs + PWM_SIFIVE_PWMCFG);
261 if (val & PWM_SIFIVE_PWMCFG_EN_ALWAYS) {
262 unsigned int i;
263
264 for (i = 0; i < chip->npwm; ++i) {
265 val = readl(ddata->regs + PWM_SIFIVE_PWMCMP(i));
266 if (val > 0)
267 ++enabled_pwms;
268 }
269 }
270
271 /* The clk should be on once for each running PWM. */
272 if (enabled_pwms) {
273 while (enabled_clks < enabled_pwms) {
274 /* This is not expected to fail as the clk is already on */
275 ret = clk_enable(ddata->clk);
276 if (unlikely(ret)) {
277 dev_err_probe(dev, ret, "Failed to enable clk\n");
278 goto disable_clk;
279 }
280 ++enabled_clks;
281 }
282 } else {
283 clk_disable(ddata->clk);
284 enabled_clks = 0;
285 }
286
287 /* Watch for changes to underlying clock frequency */
288 ddata->notifier.notifier_call = pwm_sifive_clock_notifier;
289 ret = clk_notifier_register(ddata->clk, &ddata->notifier);
290 if (ret) {
291 dev_err(dev, "failed to register clock notifier: %d\n", ret);
292 goto disable_clk;
293 }
294
295 ret = pwmchip_add(chip);
296 if (ret < 0) {
297 dev_err(dev, "cannot register PWM: %d\n", ret);
298 goto unregister_clk;
299 }
300
301 platform_set_drvdata(pdev, chip);
302 dev_dbg(dev, "SiFive PWM chip registered %d PWMs\n", chip->npwm);
303
304 return 0;
305
306 unregister_clk:
307 clk_notifier_unregister(ddata->clk, &ddata->notifier);
308 disable_clk:
309 while (enabled_clks) {
310 clk_disable(ddata->clk);
311 --enabled_clks;
312 }
313
314 return ret;
315 }
316
317 static void pwm_sifive_remove(struct platform_device *dev)
318 {
319 struct pwm_chip *chip = platform_get_drvdata(dev);
320 struct pwm_sifive_ddata *ddata = pwm_sifive_chip_to_ddata(chip);
321 struct pwm_device *pwm;
322 int ch;
323
324 pwmchip_remove(chip);
325 clk_notifier_unregister(ddata->clk, &ddata->notifier);
326
327 for (ch = 0; ch < chip->npwm; ch++) {
328 pwm = &chip->pwms[ch];
329 if (pwm->state.enabled)
330 clk_disable(ddata->clk);
331 }
332 }
333
334 static const struct of_device_id pwm_sifive_of_match[] = {
335 { .compatible = "sifive,pwm0" },
336 {},
337 };
338 MODULE_DEVICE_TABLE(of, pwm_sifive_of_match);
339
340 static struct platform_driver pwm_sifive_driver = {
341 .probe = pwm_sifive_probe,
342 .remove = pwm_sifive_remove,
343 .driver = {
344 .name = "pwm-sifive",
345 .of_match_table = pwm_sifive_of_match,
346 },
347 };
348 module_platform_driver(pwm_sifive_driver);
349
350 MODULE_DESCRIPTION("SiFive PWM driver");
> 351 MODULE_LICENSE("GPL v2");
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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