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AIo6aBi6A4AIiTkJQguV1WwZoodcEsQSVIvT/6uylQag7UKgOUAdCBLin1aDCw0jeZ53ANaXXH8UM3rksxtgdmR12qQJ4PCi7TYlSzbaV/8= X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM8PR11MB5589 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220822_021846_705698_3A4376FE X-CRM114-Status: GOOD ( 14.73 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On 22/08/2022 09:42, Dan Carpenter wrote: > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe > > Hi Conor, > > url: https://github.com/intel-lab-lkp/linux/commits/Conor-Dooley/Microchip-soft-ip-corePWM-driver/20220819-170106 > base: 568035b01cfb107af8d2e4bd2fb9aea22cf5b868 > config: arm64-randconfig-m031-20220821 (https://download.01.org/0day-ci/archive/20220821/202208212329.XETz1mt0-lkp@intel.com/config) > compiler: aarch64-linux-gcc (GCC) 12.1.0 > > If you fix the issue, kindly add following tag where applicable > Reported-by: kernel test robot > Reported-by: Dan Carpenter > > smatch warnings: > drivers/pwm/pwm-microchip-core.c:295 mchp_core_pwm_apply() warn: inconsistent returns '&mchp_core_pwm->lock'. Totally correct, there's a missing unlock. I'll send a v10 at some stage this week. Thanks Dan, Conor. > > vim +295 drivers/pwm/pwm-microchip-core.c > > ae39414af22131 Conor Dooley 2022-08-19 200 static int mchp_core_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, > ae39414af22131 Conor Dooley 2022-08-19 201 const struct pwm_state *state) > ae39414af22131 Conor Dooley 2022-08-19 202 { > ae39414af22131 Conor Dooley 2022-08-19 203 struct mchp_core_pwm_chip *mchp_core_pwm = to_mchp_core_pwm(chip); > ae39414af22131 Conor Dooley 2022-08-19 204 struct pwm_state current_state = pwm->state; > ae39414af22131 Conor Dooley 2022-08-19 205 bool period_locked; > ae39414af22131 Conor Dooley 2022-08-19 206 u64 duty_steps; > ae39414af22131 Conor Dooley 2022-08-19 207 u16 prescale; > ae39414af22131 Conor Dooley 2022-08-19 208 u8 period_steps; > ae39414af22131 Conor Dooley 2022-08-19 209 int ret; > ae39414af22131 Conor Dooley 2022-08-19 210 > ae39414af22131 Conor Dooley 2022-08-19 211 mutex_lock(&mchp_core_pwm->lock); > ae39414af22131 Conor Dooley 2022-08-19 212 > ae39414af22131 Conor Dooley 2022-08-19 213 if (!state->enabled) { > ae39414af22131 Conor Dooley 2022-08-19 214 mchp_core_pwm_enable(chip, pwm, false, current_state.period); > ae39414af22131 Conor Dooley 2022-08-19 215 mutex_unlock(&mchp_core_pwm->lock); > ae39414af22131 Conor Dooley 2022-08-19 216 return 0; > ae39414af22131 Conor Dooley 2022-08-19 217 } > ae39414af22131 Conor Dooley 2022-08-19 218 > ae39414af22131 Conor Dooley 2022-08-19 219 /* > ae39414af22131 Conor Dooley 2022-08-19 220 * If the only thing that has changed is the duty cycle or the polarity, > ae39414af22131 Conor Dooley 2022-08-19 221 * we can shortcut the calculations and just compute/apply the new duty > ae39414af22131 Conor Dooley 2022-08-19 222 * cycle pos & neg edges > ae39414af22131 Conor Dooley 2022-08-19 223 * As all the channels share the same period, do not allow it to be > ae39414af22131 Conor Dooley 2022-08-19 224 * changed if any other channels are enabled. > ae39414af22131 Conor Dooley 2022-08-19 225 * If the period is locked, it may not be possible to use a period > ae39414af22131 Conor Dooley 2022-08-19 226 * less than that requested. In that case, we just abort. > ae39414af22131 Conor Dooley 2022-08-19 227 */ > ae39414af22131 Conor Dooley 2022-08-19 228 period_locked = mchp_core_pwm->channel_enabled & ~(1 << pwm->hwpwm); > ae39414af22131 Conor Dooley 2022-08-19 229 > ae39414af22131 Conor Dooley 2022-08-19 230 if (period_locked) { > ae39414af22131 Conor Dooley 2022-08-19 231 u16 hw_prescale; > ae39414af22131 Conor Dooley 2022-08-19 232 u8 hw_period_steps; > ae39414af22131 Conor Dooley 2022-08-19 233 > ae39414af22131 Conor Dooley 2022-08-19 234 mchp_core_pwm_calc_period(chip, state, (u8 *)&prescale, &period_steps); > ae39414af22131 Conor Dooley 2022-08-19 235 hw_prescale = readb_relaxed(mchp_core_pwm->base + MCHPCOREPWM_PRESCALE); > ae39414af22131 Conor Dooley 2022-08-19 236 hw_period_steps = readb_relaxed(mchp_core_pwm->base + MCHPCOREPWM_PERIOD); > ae39414af22131 Conor Dooley 2022-08-19 237 > ae39414af22131 Conor Dooley 2022-08-19 238 if ((period_steps + 1) * (prescale + 1) < > ae39414af22131 Conor Dooley 2022-08-19 239 (hw_period_steps + 1) * (hw_prescale + 1)) { > ae39414af22131 Conor Dooley 2022-08-19 240 mutex_unlock(&mchp_core_pwm->lock); > ae39414af22131 Conor Dooley 2022-08-19 241 return -EINVAL; > ae39414af22131 Conor Dooley 2022-08-19 242 } > ae39414af22131 Conor Dooley 2022-08-19 243 > ae39414af22131 Conor Dooley 2022-08-19 244 /* > ae39414af22131 Conor Dooley 2022-08-19 245 * It is possible that something could have set the period_steps > ae39414af22131 Conor Dooley 2022-08-19 246 * register to 0xff, which would prevent us from setting a 100% > ae39414af22131 Conor Dooley 2022-08-19 247 * duty cycle, as explained in the mchp_core_pwm_calc_period() > ae39414af22131 Conor Dooley 2022-08-19 248 * above. > ae39414af22131 Conor Dooley 2022-08-19 249 * The period is locked and we cannot change this, so we abort. > ae39414af22131 Conor Dooley 2022-08-19 250 */ > ae39414af22131 Conor Dooley 2022-08-19 251 if (period_steps == MCHPCOREPWM_PERIOD_STEPS_MAX) > ae39414af22131 Conor Dooley 2022-08-19 252 return -EINVAL; > > mutex_unlock(&mchp_core_pwm->lock); before the retun? > > ae39414af22131 Conor Dooley 2022-08-19 253 > ae39414af22131 Conor Dooley 2022-08-19 254 prescale = hw_prescale; > ae39414af22131 Conor Dooley 2022-08-19 255 period_steps = hw_period_steps; > ae39414af22131 Conor Dooley 2022-08-19 256 } else if (!current_state.enabled || current_state.period != state->period) { > ae39414af22131 Conor Dooley 2022-08-19 257 ret = mchp_core_pwm_calc_period(chip, state, (u8 *)&prescale, &period_steps); > ae39414af22131 Conor Dooley 2022-08-19 258 if (ret) { > ae39414af22131 Conor Dooley 2022-08-19 259 mutex_unlock(&mchp_core_pwm->lock); > ae39414af22131 Conor Dooley 2022-08-19 260 return ret; > ae39414af22131 Conor Dooley 2022-08-19 261 } > ae39414af22131 Conor Dooley 2022-08-19 262 mchp_core_pwm_apply_period(mchp_core_pwm, prescale, period_steps); > ae39414af22131 Conor Dooley 2022-08-19 263 } else { > ae39414af22131 Conor Dooley 2022-08-19 264 prescale = readb_relaxed(mchp_core_pwm->base + MCHPCOREPWM_PRESCALE); > ae39414af22131 Conor Dooley 2022-08-19 265 period_steps = readb_relaxed(mchp_core_pwm->base + MCHPCOREPWM_PERIOD); > ae39414af22131 Conor Dooley 2022-08-19 266 > ae39414af22131 Conor Dooley 2022-08-19 267 /* > ae39414af22131 Conor Dooley 2022-08-19 268 * As above, it is possible that something could have set the > ae39414af22131 Conor Dooley 2022-08-19 269 * period_steps register to 0xff, which would prevent us from > ae39414af22131 Conor Dooley 2022-08-19 270 * setting a 100% duty cycle, as explained above. > ae39414af22131 Conor Dooley 2022-08-19 271 * As the period is not locked, we are free to fix this. > ae39414af22131 Conor Dooley 2022-08-19 272 */ > ae39414af22131 Conor Dooley 2022-08-19 273 if (period_steps == MCHPCOREPWM_PERIOD_STEPS_MAX) { > ae39414af22131 Conor Dooley 2022-08-19 274 period_steps -= 1; > ae39414af22131 Conor Dooley 2022-08-19 275 mchp_core_pwm_apply_period(mchp_core_pwm, prescale, period_steps); > ae39414af22131 Conor Dooley 2022-08-19 276 } > ae39414af22131 Conor Dooley 2022-08-19 277 } > ae39414af22131 Conor Dooley 2022-08-19 278 > ae39414af22131 Conor Dooley 2022-08-19 279 duty_steps = mchp_core_pwm_calc_duty(chip, pwm, state, prescale, period_steps); > ae39414af22131 Conor Dooley 2022-08-19 280 > ae39414af22131 Conor Dooley 2022-08-19 281 /* > ae39414af22131 Conor Dooley 2022-08-19 282 * Because the period is per channel, it is possible that the requested > ae39414af22131 Conor Dooley 2022-08-19 283 * duty cycle is longer than the period, in which case cap it to the > ae39414af22131 Conor Dooley 2022-08-19 284 * period, IOW a 100% duty cycle. > ae39414af22131 Conor Dooley 2022-08-19 285 */ > ae39414af22131 Conor Dooley 2022-08-19 286 if (duty_steps > period_steps) > ae39414af22131 Conor Dooley 2022-08-19 287 duty_steps = period_steps + 1; > ae39414af22131 Conor Dooley 2022-08-19 288 > ae39414af22131 Conor Dooley 2022-08-19 289 mchp_core_pwm_apply_duty(chip, pwm, state, duty_steps, period_steps); > ae39414af22131 Conor Dooley 2022-08-19 290 > ae39414af22131 Conor Dooley 2022-08-19 291 mchp_core_pwm_enable(chip, pwm, true, state->period); > ae39414af22131 Conor Dooley 2022-08-19 292 > ae39414af22131 Conor Dooley 2022-08-19 293 mutex_unlock(&mchp_core_pwm->lock); > ae39414af22131 Conor Dooley 2022-08-19 294 > ae39414af22131 Conor Dooley 2022-08-19 @295 return 0; > ae39414af22131 Conor Dooley 2022-08-19 296 } > > -- > 0-DAY CI Kernel Test Service > https://01.org/lkp > _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: multipart/mixed; boundary="===============8302859897031056030==" MIME-Version: 1.0 From: Conor.Dooley@microchip.com To: kbuild-all@lists.01.org Subject: Re: [PATCH v9 3/4] pwm: add microchip soft ip corePWM driver Date: Mon, 22 Aug 2022 09:18:26 +0000 Message-ID: In-Reply-To: <202208212329.XETz1mt0-lkp@intel.com> List-Id: --===============8302859897031056030== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable On 22/08/2022 09:42, Dan Carpenter wrote: > EXTERNAL EMAIL: Do not click links or open attachments unless you know th= e content is safe > = > Hi Conor, > = > url: https://github.com/intel-lab-lkp/linux/commits/Conor-Dooley/Micro= chip-soft-ip-corePWM-driver/20220819-170106 > base: 568035b01cfb107af8d2e4bd2fb9aea22cf5b868 > config: arm64-randconfig-m031-20220821 (https://download.01.org/0day-ci/a= rchive/20220821/202208212329.XETz1mt0-lkp(a)intel.com/config) > compiler: aarch64-linux-gcc (GCC) 12.1.0 > = > If you fix the issue, kindly add following tag where applicable > Reported-by: kernel test robot > Reported-by: Dan Carpenter > = > smatch warnings: > drivers/pwm/pwm-microchip-core.c:295 mchp_core_pwm_apply() warn: inconsis= tent returns '&mchp_core_pwm->lock'. Totally correct, there's a missing unlock. I'll send a v10 at some stage th= is week. Thanks Dan, Conor. > = > vim +295 drivers/pwm/pwm-microchip-core.c > = > ae39414af22131 Conor Dooley 2022-08-19 200 static int mchp_core_pwm_app= ly(struct pwm_chip *chip, struct pwm_device *pwm, > ae39414af22131 Conor Dooley 2022-08-19 201 co= nst struct pwm_state *state) > ae39414af22131 Conor Dooley 2022-08-19 202 { > ae39414af22131 Conor Dooley 2022-08-19 203 struct mchp_core_pwm_chip= *mchp_core_pwm =3D to_mchp_core_pwm(chip); > ae39414af22131 Conor Dooley 2022-08-19 204 struct pwm_state current_= state =3D pwm->state; > ae39414af22131 Conor Dooley 2022-08-19 205 bool period_locked; > ae39414af22131 Conor Dooley 2022-08-19 206 u64 duty_steps; > ae39414af22131 Conor Dooley 2022-08-19 207 u16 prescale; > ae39414af22131 Conor Dooley 2022-08-19 208 u8 period_steps; > ae39414af22131 Conor Dooley 2022-08-19 209 int ret; > ae39414af22131 Conor Dooley 2022-08-19 210 > ae39414af22131 Conor Dooley 2022-08-19 211 mutex_lock(&mchp_core_pwm= ->lock); > ae39414af22131 Conor Dooley 2022-08-19 212 > ae39414af22131 Conor Dooley 2022-08-19 213 if (!state->enabled) { > ae39414af22131 Conor Dooley 2022-08-19 214 mchp_core_pwm_ena= ble(chip, pwm, false, current_state.period); > ae39414af22131 Conor Dooley 2022-08-19 215 mutex_unlock(&mch= p_core_pwm->lock); > ae39414af22131 Conor Dooley 2022-08-19 216 return 0; > ae39414af22131 Conor Dooley 2022-08-19 217 } > ae39414af22131 Conor Dooley 2022-08-19 218 > ae39414af22131 Conor Dooley 2022-08-19 219 /* > ae39414af22131 Conor Dooley 2022-08-19 220 * If the only thing that= has changed is the duty cycle or the polarity, > ae39414af22131 Conor Dooley 2022-08-19 221 * we can shortcut the ca= lculations and just compute/apply the new duty > ae39414af22131 Conor Dooley 2022-08-19 222 * cycle pos & neg edges > ae39414af22131 Conor Dooley 2022-08-19 223 * As all the channels sh= are the same period, do not allow it to be > ae39414af22131 Conor Dooley 2022-08-19 224 * changed if any other c= hannels are enabled. > ae39414af22131 Conor Dooley 2022-08-19 225 * If the period is locke= d, it may not be possible to use a period > ae39414af22131 Conor Dooley 2022-08-19 226 * less than that request= ed. In that case, we just abort. > ae39414af22131 Conor Dooley 2022-08-19 227 */ > ae39414af22131 Conor Dooley 2022-08-19 228 period_locked =3D mchp_co= re_pwm->channel_enabled & ~(1 << pwm->hwpwm); > ae39414af22131 Conor Dooley 2022-08-19 229 > ae39414af22131 Conor Dooley 2022-08-19 230 if (period_locked) { > ae39414af22131 Conor Dooley 2022-08-19 231 u16 hw_prescale; > ae39414af22131 Conor Dooley 2022-08-19 232 u8 hw_period_step= s; > ae39414af22131 Conor Dooley 2022-08-19 233 > ae39414af22131 Conor Dooley 2022-08-19 234 mchp_core_pwm_cal= c_period(chip, state, (u8 *)&prescale, &period_steps); > ae39414af22131 Conor Dooley 2022-08-19 235 hw_prescale =3D r= eadb_relaxed(mchp_core_pwm->base + MCHPCOREPWM_PRESCALE); > ae39414af22131 Conor Dooley 2022-08-19 236 hw_period_steps = =3D readb_relaxed(mchp_core_pwm->base + MCHPCOREPWM_PERIOD); > ae39414af22131 Conor Dooley 2022-08-19 237 > ae39414af22131 Conor Dooley 2022-08-19 238 if ((period_steps= + 1) * (prescale + 1) < > ae39414af22131 Conor Dooley 2022-08-19 239 (hw_period_st= eps + 1) * (hw_prescale + 1)) { > ae39414af22131 Conor Dooley 2022-08-19 240 mutex_unl= ock(&mchp_core_pwm->lock); > ae39414af22131 Conor Dooley 2022-08-19 241 return -E= INVAL; > ae39414af22131 Conor Dooley 2022-08-19 242 } > ae39414af22131 Conor Dooley 2022-08-19 243 > ae39414af22131 Conor Dooley 2022-08-19 244 /* > ae39414af22131 Conor Dooley 2022-08-19 245 * It is possible= that something could have set the period_steps > ae39414af22131 Conor Dooley 2022-08-19 246 * register to 0x= ff, which would prevent us from setting a 100% > ae39414af22131 Conor Dooley 2022-08-19 247 * duty cycle, as= explained in the mchp_core_pwm_calc_period() > ae39414af22131 Conor Dooley 2022-08-19 248 * above. > ae39414af22131 Conor Dooley 2022-08-19 249 * The period is = locked and we cannot change this, so we abort. > ae39414af22131 Conor Dooley 2022-08-19 250 */ > ae39414af22131 Conor Dooley 2022-08-19 251 if (period_steps = =3D=3D MCHPCOREPWM_PERIOD_STEPS_MAX) > ae39414af22131 Conor Dooley 2022-08-19 252 return -E= INVAL; > = > mutex_unlock(&mchp_core_pwm->lock); before the retun? > = > ae39414af22131 Conor Dooley 2022-08-19 253 > ae39414af22131 Conor Dooley 2022-08-19 254 prescale =3D hw_p= rescale; > ae39414af22131 Conor Dooley 2022-08-19 255 period_steps =3D = hw_period_steps; > ae39414af22131 Conor Dooley 2022-08-19 256 } else if (!current_state= .enabled || current_state.period !=3D state->period) { > ae39414af22131 Conor Dooley 2022-08-19 257 ret =3D mchp_core= _pwm_calc_period(chip, state, (u8 *)&prescale, &period_steps); > ae39414af22131 Conor Dooley 2022-08-19 258 if (ret) { > ae39414af22131 Conor Dooley 2022-08-19 259 mutex_unl= ock(&mchp_core_pwm->lock); > ae39414af22131 Conor Dooley 2022-08-19 260 return re= t; > ae39414af22131 Conor Dooley 2022-08-19 261 } > ae39414af22131 Conor Dooley 2022-08-19 262 mchp_core_pwm_app= ly_period(mchp_core_pwm, prescale, period_steps); > ae39414af22131 Conor Dooley 2022-08-19 263 } else { > ae39414af22131 Conor Dooley 2022-08-19 264 prescale =3D read= b_relaxed(mchp_core_pwm->base + MCHPCOREPWM_PRESCALE); > ae39414af22131 Conor Dooley 2022-08-19 265 period_steps =3D = readb_relaxed(mchp_core_pwm->base + MCHPCOREPWM_PERIOD); > ae39414af22131 Conor Dooley 2022-08-19 266 > ae39414af22131 Conor Dooley 2022-08-19 267 /* > ae39414af22131 Conor Dooley 2022-08-19 268 * As above, it i= s possible that something could have set the > ae39414af22131 Conor Dooley 2022-08-19 269 * period_steps r= egister to 0xff, which would prevent us from > ae39414af22131 Conor Dooley 2022-08-19 270 * setting a 100%= duty cycle, as explained above. > ae39414af22131 Conor Dooley 2022-08-19 271 * As the period = is not locked, we are free to fix this. > ae39414af22131 Conor Dooley 2022-08-19 272 */ > ae39414af22131 Conor Dooley 2022-08-19 273 if (period_steps = =3D=3D MCHPCOREPWM_PERIOD_STEPS_MAX) { > ae39414af22131 Conor Dooley 2022-08-19 274 period_st= eps -=3D 1; > ae39414af22131 Conor Dooley 2022-08-19 275 mchp_core= _pwm_apply_period(mchp_core_pwm, prescale, period_steps); > ae39414af22131 Conor Dooley 2022-08-19 276 } > ae39414af22131 Conor Dooley 2022-08-19 277 } > ae39414af22131 Conor Dooley 2022-08-19 278 > ae39414af22131 Conor Dooley 2022-08-19 279 duty_steps =3D mchp_core_= pwm_calc_duty(chip, pwm, state, prescale, period_steps); > ae39414af22131 Conor Dooley 2022-08-19 280 > ae39414af22131 Conor Dooley 2022-08-19 281 /* > ae39414af22131 Conor Dooley 2022-08-19 282 * Because the period is = per channel, it is possible that the requested > ae39414af22131 Conor Dooley 2022-08-19 283 * duty cycle is longer t= han the period, in which case cap it to the > ae39414af22131 Conor Dooley 2022-08-19 284 * period, IOW a 100% dut= y cycle. > ae39414af22131 Conor Dooley 2022-08-19 285 */ > ae39414af22131 Conor Dooley 2022-08-19 286 if (duty_steps > period_s= teps) > ae39414af22131 Conor Dooley 2022-08-19 287 duty_steps =3D pe= riod_steps + 1; > ae39414af22131 Conor Dooley 2022-08-19 288 > ae39414af22131 Conor Dooley 2022-08-19 289 mchp_core_pwm_apply_duty(= chip, pwm, state, duty_steps, period_steps); > ae39414af22131 Conor Dooley 2022-08-19 290 > ae39414af22131 Conor Dooley 2022-08-19 291 mchp_core_pwm_enable(chip= , pwm, true, state->period); > ae39414af22131 Conor Dooley 2022-08-19 292 > ae39414af22131 Conor Dooley 2022-08-19 293 mutex_unlock(&mchp_core_p= wm->lock); > ae39414af22131 Conor Dooley 2022-08-19 294 > ae39414af22131 Conor Dooley 2022-08-19 @295 return 0; > ae39414af22131 Conor Dooley 2022-08-19 296 } > = > -- > 0-DAY CI Kernel Test Service > https://01.org/lkp > = --===============8302859897031056030==--