Messages in this thread | | | Subject | Re: [PATCH v5 2/4] clocksource: stm32: only use 32 bits timers | From | Julien Thierry <> | Date | Wed, 18 Oct 2017 09:21:50 +0100 |
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On 18/10/17 08:43, Benjamin Gaignard wrote: > 16 bits hardware are not enough accure to be used. > Do no allow them to be probed by tested max counter value. > > Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org> > --- > drivers/clocksource/timer-stm32.c | 23 +++++++++-------------- > 1 file changed, 9 insertions(+), 14 deletions(-) > > diff --git a/drivers/clocksource/timer-stm32.c b/drivers/clocksource/timer-stm32.c > index abff21c..f7e4eec 100644 > --- a/drivers/clocksource/timer-stm32.c > +++ b/drivers/clocksource/timer-stm32.c > @@ -81,9 +81,9 @@ static irqreturn_t stm32_clock_event_handler(int irq, void *dev_id) > static int __init stm32_clockevent_init(struct device_node *node) > { > struct reset_control *rstc; > - unsigned long max_delta; > - int ret, bits, prescaler = 1; > + unsigned long max_arr; > struct timer_of *to; > + int ret; > > to = kzalloc(sizeof(*to), GFP_KERNEL); > if (!to) > @@ -113,26 +113,21 @@ static int __init stm32_clockevent_init(struct device_node *node) > > /* Detect whether the timer is 16 or 32 bits */ > writel_relaxed(~0U, timer_of_base(to) + TIM_ARR); > - max_delta = readl_relaxed(timer_of_base(to) + TIM_ARR); > - if (max_delta == ~0U) { > - prescaler = 1; > - bits = 32; > - } else { > - prescaler = 1024; > - bits = 16; > + max_arr = readl_relaxed(timer_of_base(to) + TIM_ARR); > + if (max_arr != ~0U) { > + pr_err("32 bits timer is needed\n"); > + return -EINVAL;
Same as with previous patch, I think "to" should get freed.
Also, why is there no function to undo what timer_of_init did? Shouldn't we be able to free the irqs and unmap the timer io base here?
Cheers,
-- Julien Thierry
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