| Message ID | 20240905090627.197536-2-u.kleine-koenig@baylibre.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | pwm: stm32: Use the right CCxNP bit in stm32_pwm_enable() | expand |
On 9/5/24 11:06, Uwe Kleine-König wrote: > The pwm devices for a pwm_chip are numbered starting at 0, the first hw > channel however has the number 1. While introducing a parametrised macro > to simplify register bit usage and making that offset explicit, one of > the usages was converted wrongly. This is fixed here. > > Fixes: 7cea05ae1d4e ("pwm-stm32: Make use of parametrised register definitions") > Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com> > --- > Hello, > > during review of a patch to the stm32 pwm driver Fabrice pointed out a > wrong usage of TIM_CCER_CCxNE. While (I think) we both assumed this was > a problem in said patch, that problem existed already before and the > proposed change just moved the problem around. So instead of (only) > updating the patch later, here comes a separate fix for the driver. > > I intend to send this to Linus tomorrow to get it into 6.11-rc7. Hi UWe, Good catch, I haven't noticed this has been introduced in earlier patch. You can add my: Reviewed-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com> Does it need to be CC'ed to stable list also ? Thanks, BR, Fabrice > > Best regards > Uwe > > drivers/pwm/pwm-stm32.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/pwm/pwm-stm32.c b/drivers/pwm/pwm-stm32.c > index fd754a99cf2e..f85eb41cb084 100644 > --- a/drivers/pwm/pwm-stm32.c > +++ b/drivers/pwm/pwm-stm32.c > @@ -412,7 +412,7 @@ static int stm32_pwm_enable(struct stm32_pwm *priv, unsigned int ch) > /* Enable channel */ > mask = TIM_CCER_CCxE(ch + 1); > if (priv->have_complementary_output) > - mask |= TIM_CCER_CCxNE(ch); > + mask |= TIM_CCER_CCxNE(ch + 1); > > regmap_set_bits(priv->regmap, TIM_CCER, mask); > > base-commit: 8400291e289ee6b2bf9779ff1c83a291501f017b
On Fri, Sep 06, 2024 at 02:40:01PM +0200, Fabrice Gasnier wrote: > Good catch, I haven't noticed this has been introduced in earlier patch. Well, wasn't so difficult to find. When I tried to fix my conversion to the new waveform callbacks it was quickly obvious that the patch base was already broken. > You can add my: > Reviewed-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com> thanks, but I was to quick. I already sent a pull request to Linus (https://lore.kernel.org/linux-pwm/25x74hglxoyb33fphdrtxrpmvsqe5227d7vy6uo6ez77hjbrn6@dh637q6cvzax/) > Does it need to be CC'ed to stable list also ? No, the issue was introduced in 7cea05ae1d4e which is only in mainline since v6.11-rc1. So assuming the fix will make it in before v6.11 there is no need for stable backports. Best regards and thanks once more for your feedback, Uwe
diff --git a/drivers/pwm/pwm-stm32.c b/drivers/pwm/pwm-stm32.c index fd754a99cf2e..f85eb41cb084 100644 --- a/drivers/pwm/pwm-stm32.c +++ b/drivers/pwm/pwm-stm32.c @@ -412,7 +412,7 @@ static int stm32_pwm_enable(struct stm32_pwm *priv, unsigned int ch) /* Enable channel */ mask = TIM_CCER_CCxE(ch + 1); if (priv->have_complementary_output) - mask |= TIM_CCER_CCxNE(ch); + mask |= TIM_CCER_CCxNE(ch + 1); regmap_set_bits(priv->regmap, TIM_CCER, mask);
The pwm devices for a pwm_chip are numbered starting at 0, the first hw channel however has the number 1. While introducing a parametrised macro to simplify register bit usage and making that offset explicit, one of the usages was converted wrongly. This is fixed here. Fixes: 7cea05ae1d4e ("pwm-stm32: Make use of parametrised register definitions") Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com> --- Hello, during review of a patch to the stm32 pwm driver Fabrice pointed out a wrong usage of TIM_CCER_CCxNE. While (I think) we both assumed this was a problem in said patch, that problem existed already before and the proposed change just moved the problem around. So instead of (only) updating the patch later, here comes a separate fix for the driver. I intend to send this to Linus tomorrow to get it into 6.11-rc7. Best regards Uwe drivers/pwm/pwm-stm32.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) base-commit: 8400291e289ee6b2bf9779ff1c83a291501f017b