* [PATCH v2 1/2] drivers: thermal: tsens: fix wrong check for tzd in irq handlers @ 2021-09-07 21:25 Ansuel Smith 2021-09-07 21:25 ` [PATCH v2 2/2] drivers: thermal: tsens: add timeout to get_tem_tsens_valid Ansuel Smith 2021-09-17 9:08 ` [PATCH v2 1/2] drivers: thermal: tsens: fix wrong check for tzd in irq handlers Daniel Lezcano 0 siblings, 2 replies; 6+ messages in thread From: Ansuel Smith @ 2021-09-07 21:25 UTC (permalink / raw) To: Andy Gross, Bjorn Andersson, Amit Kucheria, Thara Gopinath, Zhang Rui, Daniel Lezcano, linux-arm-msm, linux-pm, linux-kernel Cc: Ansuel Smith, Matthias Kaehlcke Some device can have some thermal sensor disabled from the factory. The current 2 irq handler functions check all the sensor by default and the check if the sensor was actually registered is wrong. The tzd is actually never set if the registration fail hence the IS_ERR check is wrong. Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com> Reviewed-by: Matthias Kaehlcke <mka@chromium.org> --- drivers/thermal/qcom/tsens.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/thermal/qcom/tsens.c b/drivers/thermal/qcom/tsens.c index 4c7ebd1d3f9c..b1162e566a70 100644 --- a/drivers/thermal/qcom/tsens.c +++ b/drivers/thermal/qcom/tsens.c @@ -417,7 +417,7 @@ static irqreturn_t tsens_critical_irq_thread(int irq, void *data) const struct tsens_sensor *s = &priv->sensor[i]; u32 hw_id = s->hw_id; - if (IS_ERR(s->tzd)) + if (!s->tzd) continue; if (!tsens_threshold_violated(priv, hw_id, &d)) continue; @@ -467,7 +467,7 @@ static irqreturn_t tsens_irq_thread(int irq, void *data) const struct tsens_sensor *s = &priv->sensor[i]; u32 hw_id = s->hw_id; - if (IS_ERR(s->tzd)) + if (!s->tzd) continue; if (!tsens_threshold_violated(priv, hw_id, &d)) continue; -- 2.32.0 ^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH v2 2/2] drivers: thermal: tsens: add timeout to get_tem_tsens_valid 2021-09-07 21:25 [PATCH v2 1/2] drivers: thermal: tsens: fix wrong check for tzd in irq handlers Ansuel Smith @ 2021-09-07 21:25 ` Ansuel Smith 2021-09-07 21:57 ` Matthias Kaehlcke 2021-09-17 9:08 ` Daniel Lezcano 2021-09-17 9:08 ` [PATCH v2 1/2] drivers: thermal: tsens: fix wrong check for tzd in irq handlers Daniel Lezcano 1 sibling, 2 replies; 6+ messages in thread From: Ansuel Smith @ 2021-09-07 21:25 UTC (permalink / raw) To: Andy Gross, Bjorn Andersson, Amit Kucheria, Thara Gopinath, Zhang Rui, Daniel Lezcano, linux-arm-msm, linux-pm, linux-kernel Cc: Ansuel Smith The function can loop and lock the system if for whatever reason the bit for the target sensor is NEVER valid. This is the case if a sensor is disabled by the factory and the valid bit is never reported as actually valid. Add a timeout check and exit if a timeout occurs. As this is a very rare condition, handle the timeout only if the first read fails. While at it also rework the function to improve readability. Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com> --- drivers/thermal/qcom/tsens.c | 40 +++++++++++++++++++++++------------- 1 file changed, 26 insertions(+), 14 deletions(-) diff --git a/drivers/thermal/qcom/tsens.c b/drivers/thermal/qcom/tsens.c index b1162e566a70..1ff244176beb 100644 --- a/drivers/thermal/qcom/tsens.c +++ b/drivers/thermal/qcom/tsens.c @@ -599,26 +599,38 @@ int get_temp_tsens_valid(const struct tsens_sensor *s, int *temp) int hw_id = s->hw_id; u32 temp_idx = LAST_TEMP_0 + hw_id; u32 valid_idx = VALID_0 + hw_id; + unsigned long timeout; u32 valid; int ret; /* VER_0 doesn't have VALID bit */ - if (tsens_version(priv) >= VER_0_1) { + if (tsens_version(priv) == VER_0) + goto get_temp; + + ret = regmap_field_read(priv->rf[valid_idx], &valid); + if (ret || valid) + goto check_valid; + + timeout = jiffies + msecs_to_jiffies(20); + do { + /* Valid bit is 0 for 6 AHB clock cycles. + * At 19.2MHz, 1 AHB clock is ~60ns. + * We should enter this loop very, very rarely. + */ + ndelay(400); ret = regmap_field_read(priv->rf[valid_idx], &valid); - if (ret) - return ret; - while (!valid) { - /* Valid bit is 0 for 6 AHB clock cycles. - * At 19.2MHz, 1 AHB clock is ~60ns. - * We should enter this loop very, very rarely. - */ - ndelay(400); - ret = regmap_field_read(priv->rf[valid_idx], &valid); - if (ret) - return ret; - } - } + if (ret || valid) + goto check_valid; + } while (time_before(jiffies, timeout)); + + return -ETIMEDOUT; + +check_valid: + /* Check ret of valid bit read */ + if (ret) + return ret; +get_temp: /* Valid bit is set, OK to read the temperature */ *temp = tsens_hw_to_mC(s, temp_idx); -- 2.32.0 ^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH v2 2/2] drivers: thermal: tsens: add timeout to get_tem_tsens_valid 2021-09-07 21:25 ` [PATCH v2 2/2] drivers: thermal: tsens: add timeout to get_tem_tsens_valid Ansuel Smith @ 2021-09-07 21:57 ` Matthias Kaehlcke 2021-09-17 9:08 ` Daniel Lezcano 1 sibling, 0 replies; 6+ messages in thread From: Matthias Kaehlcke @ 2021-09-07 21:57 UTC (permalink / raw) To: Ansuel Smith Cc: Andy Gross, Bjorn Andersson, Amit Kucheria, Thara Gopinath, Zhang Rui, Daniel Lezcano, linux-arm-msm, linux-pm, linux-kernel On Tue, Sep 07, 2021 at 11:25:43PM +0200, Ansuel Smith wrote: > The function can loop and lock the system if for whatever reason the bit > for the target sensor is NEVER valid. This is the case if a sensor is > disabled by the factory and the valid bit is never reported as actually > valid. Add a timeout check and exit if a timeout occurs. As this is > a very rare condition, handle the timeout only if the first read fails. > While at it also rework the function to improve readability. > > Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com> > --- > drivers/thermal/qcom/tsens.c | 40 +++++++++++++++++++++++------------- > 1 file changed, 26 insertions(+), 14 deletions(-) > > diff --git a/drivers/thermal/qcom/tsens.c b/drivers/thermal/qcom/tsens.c > index b1162e566a70..1ff244176beb 100644 > --- a/drivers/thermal/qcom/tsens.c > +++ b/drivers/thermal/qcom/tsens.c > @@ -599,26 +599,38 @@ int get_temp_tsens_valid(const struct tsens_sensor *s, int *temp) > int hw_id = s->hw_id; > u32 temp_idx = LAST_TEMP_0 + hw_id; > u32 valid_idx = VALID_0 + hw_id; > + unsigned long timeout; > u32 valid; > int ret; > > /* VER_0 doesn't have VALID bit */ > - if (tsens_version(priv) >= VER_0_1) { > + if (tsens_version(priv) == VER_0) > + goto get_temp; > + > + ret = regmap_field_read(priv->rf[valid_idx], &valid); > + if (ret || valid) > + goto check_valid; > + > + timeout = jiffies + msecs_to_jiffies(20); > + do { > + /* Valid bit is 0 for 6 AHB clock cycles. > + * At 19.2MHz, 1 AHB clock is ~60ns. > + * We should enter this loop very, very rarely. > + */ > + ndelay(400); > ret = regmap_field_read(priv->rf[valid_idx], &valid); > - if (ret) > - return ret; > - while (!valid) { > - /* Valid bit is 0 for 6 AHB clock cycles. > - * At 19.2MHz, 1 AHB clock is ~60ns. > - * We should enter this loop very, very rarely. > - */ > - ndelay(400); > - ret = regmap_field_read(priv->rf[valid_idx], &valid); > - if (ret) > - return ret; > - } > - } > + if (ret || valid) > + goto check_valid; > + } while (time_before(jiffies, timeout)); > + > + return -ETIMEDOUT; > + > +check_valid: > + /* Check ret of valid bit read */ > + if (ret) > + return ret; > > +get_temp: > /* Valid bit is set, OK to read the temperature */ > *temp = tsens_hw_to_mC(s, temp_idx); I still think that something like this would be clearer than the multiple jumps to 'check_valid': ret = regmap_field_read(priv->rf[valid_idx], &valid); if (ret) return ret; timeout = jiffies + msecs_to_jiffies(20); while (!valid) { /* Valid bit is 0 for 6 AHB clock cycles. * At 19.2MHz, 1 AHB clock is ~60ns. * We should enter this loop very, very rarely. */ ndelay(400); ret = regmap_field_read(priv->rf[valid_idx], &valid); if (ret) return ret; if (time_after(jiffies, timeout)) return -ETIMEDOUT; }; That said, I'm just a random dude, so my opinion isn't really important, as long as the maintainers are happy with the change :) ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v2 2/2] drivers: thermal: tsens: add timeout to get_tem_tsens_valid 2021-09-07 21:25 ` [PATCH v2 2/2] drivers: thermal: tsens: add timeout to get_tem_tsens_valid Ansuel Smith 2021-09-07 21:57 ` Matthias Kaehlcke @ 2021-09-17 9:08 ` Daniel Lezcano 2021-09-17 11:06 ` Ansuel Smith 1 sibling, 1 reply; 6+ messages in thread From: Daniel Lezcano @ 2021-09-17 9:08 UTC (permalink / raw) To: Ansuel Smith, Andy Gross, Bjorn Andersson, Amit Kucheria, Thara Gopinath, Zhang Rui, linux-arm-msm, linux-pm, linux-kernel On 07/09/2021 23:25, Ansuel Smith wrote: > The function can loop and lock the system if for whatever reason the bit > for the target sensor is NEVER valid. This is the case if a sensor is > disabled by the factory and the valid bit is never reported as actually > valid. Add a timeout check and exit if a timeout occurs. As this is > a very rare condition, handle the timeout only if the first read fails. > While at it also rework the function to improve readability. > > Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com> > --- > drivers/thermal/qcom/tsens.c | 40 +++++++++++++++++++++++------------- > 1 file changed, 26 insertions(+), 14 deletions(-) > > diff --git a/drivers/thermal/qcom/tsens.c b/drivers/thermal/qcom/tsens.c > index b1162e566a70..1ff244176beb 100644 > --- a/drivers/thermal/qcom/tsens.c > +++ b/drivers/thermal/qcom/tsens.c > @@ -599,26 +599,38 @@ int get_temp_tsens_valid(const struct tsens_sensor *s, int *temp) > int hw_id = s->hw_id; > u32 temp_idx = LAST_TEMP_0 + hw_id; > u32 valid_idx = VALID_0 + hw_id; > + unsigned long timeout; > u32 valid; > int ret; > > /* VER_0 doesn't have VALID bit */ > - if (tsens_version(priv) >= VER_0_1) { > + if (tsens_version(priv) == VER_0) > + goto get_temp; > + > + ret = regmap_field_read(priv->rf[valid_idx], &valid); > + if (ret || valid) > + goto check_valid; > + > + timeout = jiffies + msecs_to_jiffies(20); Why not use regmap_field_read_poll_timeout() ? > + do { > + /* Valid bit is 0 for 6 AHB clock cycles. > + * At 19.2MHz, 1 AHB clock is ~60ns. > + * We should enter this loop very, very rarely. > + */ > + ndelay(400); > ret = regmap_field_read(priv->rf[valid_idx], &valid); > - if (ret) > - return ret; > - while (!valid) { > - /* Valid bit is 0 for 6 AHB clock cycles. > - * At 19.2MHz, 1 AHB clock is ~60ns. > - * We should enter this loop very, very rarely. > - */ > - ndelay(400); > - ret = regmap_field_read(priv->rf[valid_idx], &valid); > - if (ret) > - return ret; > - } > - } > + if (ret || valid) > + goto check_valid; > + } while (time_before(jiffies, timeout)); > + > + return -ETIMEDOUT; > + > +check_valid: > + /* Check ret of valid bit read */ > + if (ret) > + return ret; > > +get_temp: > /* Valid bit is set, OK to read the temperature */ > *temp = tsens_hw_to_mC(s, temp_idx); > > -- <http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook | <http://twitter.com/#!/linaroorg> Twitter | <http://www.linaro.org/linaro-blog/> Blog ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v2 2/2] drivers: thermal: tsens: add timeout to get_tem_tsens_valid 2021-09-17 9:08 ` Daniel Lezcano @ 2021-09-17 11:06 ` Ansuel Smith 0 siblings, 0 replies; 6+ messages in thread From: Ansuel Smith @ 2021-09-17 11:06 UTC (permalink / raw) To: Daniel Lezcano Cc: Andy Gross, Bjorn Andersson, Amit Kucheria, Thara Gopinath, Zhang Rui, linux-arm-msm, linux-pm, linux-kernel On Fri, Sep 17, 2021 at 11:08:15AM +0200, Daniel Lezcano wrote: > On 07/09/2021 23:25, Ansuel Smith wrote: > > The function can loop and lock the system if for whatever reason the bit > > for the target sensor is NEVER valid. This is the case if a sensor is > > disabled by the factory and the valid bit is never reported as actually > > valid. Add a timeout check and exit if a timeout occurs. As this is > > a very rare condition, handle the timeout only if the first read fails. > > While at it also rework the function to improve readability. > > > > Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com> > > --- > > drivers/thermal/qcom/tsens.c | 40 +++++++++++++++++++++++------------- > > 1 file changed, 26 insertions(+), 14 deletions(-) > > > > diff --git a/drivers/thermal/qcom/tsens.c b/drivers/thermal/qcom/tsens.c > > index b1162e566a70..1ff244176beb 100644 > > --- a/drivers/thermal/qcom/tsens.c > > +++ b/drivers/thermal/qcom/tsens.c > > @@ -599,26 +599,38 @@ int get_temp_tsens_valid(const struct tsens_sensor *s, int *temp) > > int hw_id = s->hw_id; > > u32 temp_idx = LAST_TEMP_0 + hw_id; > > u32 valid_idx = VALID_0 + hw_id; > > + unsigned long timeout; > > u32 valid; > > int ret; > > > > /* VER_0 doesn't have VALID bit */ > > - if (tsens_version(priv) >= VER_0_1) { > > + if (tsens_version(priv) == VER_0) > > + goto get_temp; > > + > > + ret = regmap_field_read(priv->rf[valid_idx], &valid); > > + if (ret || valid) > > + goto check_valid; > > + > > + timeout = jiffies + msecs_to_jiffies(20); > > Why not use regmap_field_read_poll_timeout() ? > Ok will convert this to pool_timeout and send v3. Thx for the review. > > + do { > > + /* Valid bit is 0 for 6 AHB clock cycles. > > + * At 19.2MHz, 1 AHB clock is ~60ns. > > + * We should enter this loop very, very rarely. > > + */ > > + ndelay(400); > > ret = regmap_field_read(priv->rf[valid_idx], &valid); > > - if (ret) > > - return ret; > > - while (!valid) { > > - /* Valid bit is 0 for 6 AHB clock cycles. > > - * At 19.2MHz, 1 AHB clock is ~60ns. > > - * We should enter this loop very, very rarely. > > - */ > > - ndelay(400); > > - ret = regmap_field_read(priv->rf[valid_idx], &valid); > > - if (ret) > > - return ret; > > - } > > - } > > + if (ret || valid) > > + goto check_valid; > > + } while (time_before(jiffies, timeout)); > > + > > + return -ETIMEDOUT; > > + > > +check_valid: > > + /* Check ret of valid bit read */ > > + if (ret) > > + return ret; > > > > +get_temp: > > /* Valid bit is set, OK to read the temperature */ > > *temp = tsens_hw_to_mC(s, temp_idx); > > > > > > > -- > <http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs > > Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook | > <http://twitter.com/#!/linaroorg> Twitter | > <http://www.linaro.org/linaro-blog/> Blog ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v2 1/2] drivers: thermal: tsens: fix wrong check for tzd in irq handlers 2021-09-07 21:25 [PATCH v2 1/2] drivers: thermal: tsens: fix wrong check for tzd in irq handlers Ansuel Smith 2021-09-07 21:25 ` [PATCH v2 2/2] drivers: thermal: tsens: add timeout to get_tem_tsens_valid Ansuel Smith @ 2021-09-17 9:08 ` Daniel Lezcano 1 sibling, 0 replies; 6+ messages in thread From: Daniel Lezcano @ 2021-09-17 9:08 UTC (permalink / raw) To: Ansuel Smith, Andy Gross, Bjorn Andersson, Amit Kucheria, Thara Gopinath, Zhang Rui, linux-arm-msm, linux-pm, linux-kernel Cc: Matthias Kaehlcke Applied, thanks On 07/09/2021 23:25, Ansuel Smith wrote: > Some device can have some thermal sensor disabled from the factory. The > current 2 irq handler functions check all the sensor by default and the > check if the sensor was actually registered is wrong. The tzd is > actually never set if the registration fail hence the IS_ERR check is > wrong. > > Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com> > Reviewed-by: Matthias Kaehlcke <mka@chromium.org> > --- > drivers/thermal/qcom/tsens.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/thermal/qcom/tsens.c b/drivers/thermal/qcom/tsens.c > index 4c7ebd1d3f9c..b1162e566a70 100644 > --- a/drivers/thermal/qcom/tsens.c > +++ b/drivers/thermal/qcom/tsens.c > @@ -417,7 +417,7 @@ static irqreturn_t tsens_critical_irq_thread(int irq, void *data) > const struct tsens_sensor *s = &priv->sensor[i]; > u32 hw_id = s->hw_id; > > - if (IS_ERR(s->tzd)) > + if (!s->tzd) > continue; > if (!tsens_threshold_violated(priv, hw_id, &d)) > continue; > @@ -467,7 +467,7 @@ static irqreturn_t tsens_irq_thread(int irq, void *data) > const struct tsens_sensor *s = &priv->sensor[i]; > u32 hw_id = s->hw_id; > > - if (IS_ERR(s->tzd)) > + if (!s->tzd) > continue; > if (!tsens_threshold_violated(priv, hw_id, &d)) > continue; > -- <http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook | <http://twitter.com/#!/linaroorg> Twitter | <http://www.linaro.org/linaro-blog/> Blog ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2021-09-17 11:06 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2021-09-07 21:25 [PATCH v2 1/2] drivers: thermal: tsens: fix wrong check for tzd in irq handlers Ansuel Smith 2021-09-07 21:25 ` [PATCH v2 2/2] drivers: thermal: tsens: add timeout to get_tem_tsens_valid Ansuel Smith 2021-09-07 21:57 ` Matthias Kaehlcke 2021-09-17 9:08 ` Daniel Lezcano 2021-09-17 11:06 ` Ansuel Smith 2021-09-17 9:08 ` [PATCH v2 1/2] drivers: thermal: tsens: fix wrong check for tzd in irq handlers Daniel Lezcano
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for NNTP newsgroup(s).