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Re: [PATCH v1 02/10] clockevents/drivers: add MPS2 Timer driver

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  Re: [PATCH v1 02/10] clockevents/drivers: add MPS2 Timer driver Daniel Lezcano <daniel.lezcano@linaro.org> - 2015-12-14 14:40 +0100
    Re: [PATCH v1 02/10] clockevents/drivers: add MPS2 Timer driver Vladimir Murzin <vladimir.murzin@arm.com> - 2015-12-15 13:50 +0100

#1291190 — Re: [PATCH v1 02/10] clockevents/drivers: add MPS2 Timer driver

On 12/02/2015 10:33 AM, Vladimir Murzin wrote:
> MPS2 platform has simple 32 bits general purpose countdown timers.
>
> The driver uses the first detected timer as a clocksource and the rest
> of the timers as a clockevent
>
> Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
> ---

[ ... ]

> +static void clockevent_mps2_writel(u32 val, struct clock_event_device *c, u32 offset)
> +{
> +	writel(val, to_mps2_clkevt(c)->reg + offset);
> +}

Is it possible to use writel_relaxed here ?

[ ... ]

> +static int mps2_timer_set_periodic(struct clock_event_device *ce)
> +{
> +	u32 clock_count_per_tick = to_mps2_clkevt(ce)->clock_count_per_tick;
> +
> +	clockevent_mps2_writel(clock_count_per_tick, ce, TIMER_RELOAD);
> +	clockevent_mps2_writel(clock_count_per_tick, ce, TIMER_VALUE);
> +	clockevent_mps2_writel(TIMER_CTRL_IE | TIMER_CTRL_ENABLE, ce, TIMER_CTRL);
> +
> +	return 0;
> +}
> +
> +static irqreturn_t mps2_timer_interrupt(int irq, void *dev_id)
> +{
> +	struct clockevent_mps2 *ce = dev_id;
> +	u32 status = readl(ce->reg + TIMER_INT);
> +
> +	if (!status) {
> +		pr_warn("spuirous interrupt\n");

typo: 'spurious'

[ ... ]

> +	ce = kzalloc(sizeof(struct clockevent_mps2), GFP_KERNEL);
> +	if (!ce) {
> +		ret = -ENOMEM;
> +		pr_err("failed to allocate clockevent: %d\n", ret);

There is already a stack trace in the kernel when an allocation fails.

With the above fixed:

Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>


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#1292121

On 14/12/15 13:36, Daniel Lezcano wrote:
> On 12/02/2015 10:33 AM, Vladimir Murzin wrote:
>> MPS2 platform has simple 32 bits general purpose countdown timers.
>>
>> The driver uses the first detected timer as a clocksource and the rest
>> of the timers as a clockevent
>>
>> Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
>> ---
> 
> [ ... ]
> 
>> +static void clockevent_mps2_writel(u32 val, struct clock_event_device
>> *c, u32 offset)
>> +{
>> +    writel(val, to_mps2_clkevt(c)->reg + offset);
>> +}
> 
> Is it possible to use writel_relaxed here ?

I think it is possible. I'll update that part.

> 
> [ ... ]
> 
>> +static int mps2_timer_set_periodic(struct clock_event_device *ce)
>> +{
>> +    u32 clock_count_per_tick = to_mps2_clkevt(ce)->clock_count_per_tick;
>> +
>> +    clockevent_mps2_writel(clock_count_per_tick, ce, TIMER_RELOAD);
>> +    clockevent_mps2_writel(clock_count_per_tick, ce, TIMER_VALUE);
>> +    clockevent_mps2_writel(TIMER_CTRL_IE | TIMER_CTRL_ENABLE, ce,
>> TIMER_CTRL);
>> +
>> +    return 0;
>> +}
>> +
>> +static irqreturn_t mps2_timer_interrupt(int irq, void *dev_id)
>> +{
>> +    struct clockevent_mps2 *ce = dev_id;
>> +    u32 status = readl(ce->reg + TIMER_INT);
>> +
>> +    if (!status) {
>> +        pr_warn("spuirous interrupt\n");
> 
> typo: 'spurious'
> 
> [ ... ]
> 
>> +    ce = kzalloc(sizeof(struct clockevent_mps2), GFP_KERNEL);
>> +    if (!ce) {
>> +        ret = -ENOMEM;
>> +        pr_err("failed to allocate clockevent: %d\n", ret);
> 
> There is already a stack trace in the kernel when an allocation fails.
> 
> With the above fixed:
> 
> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
> 
> 

All above fixed locally.

Thanks
Vladimir


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