Re: [PATCH v4 1/3] power-domain: add power domain drivers for Rockchip platform

[Hong jinkun <jinkun.hong@rock-chips.com>]

在 2014/10/21 5:31, Kevin Hilman 写道:
> "jinkun.hong" <jinkun.hong@rock-chips.com> writes:
>
>> From: "jinkun.hong" <jinkun.hong@rock-chips.com>
>>
>> Add power domain drivers based on generic power domain for Rockchip platform,
>> and support RK3288.
>>
>> Signed-off-by: Jack Dai <jack.dai@rock-chips.com>
>> Signed-off-by: jinkun.hong <jinkun.hong@rock-chips.com>
> [...]
>
>> +static int rockchip_pmu_set_idle_request(struct rockchip_domain *pd,
>> +					 bool idle)
>> +{
>> +	u32 idle_mask = BIT(pd->idle_shift);
>> +	u32 idle_target = idle << (pd->idle_shift);
>> +	u32 ack_mask = BIT(pd->ack_shift);
>> +	u32 ack_target = idle << (pd->ack_shift);
>> +	unsigned int mask = BIT(pd->req_shift);
>> +	unsigned int val;
>> +	unsigned long flags;
>> +
>> +	spin_lock_irqsave(&pd->idle_lock, flags);
>> +	val = (idle) ? mask : 0;
>> +	regmap_update_bits(pd->regmap_pmu, REQ_OFFSET, mask, val);
>> +	dsb();
> A summary of the locking and barriers here (or in changelog) would be
> helpful for reviewers to verify you're protecting what you need to
> protect.
>
>> +	do {
>> +		regmap_read(pd->regmap_pmu, ACK_OFFSET, &val);
>> +	} while ((val & ack_mask) != ack_target);
>> +
>> +	do {
>> +		regmap_read(pd->regmap_pmu, IDLE_OFFSET, &val);
>> +	} while ((val & idle_mask) != idle_target);
>> +
>> +	spin_unlock_irqrestore(&pd->idle_lock, flags);
> These IRQ-disabled while loops look like opportunities to lockup the
> system.  Maybe add a timeout or a maximum number of tries?
Ok,I will add a timeout in new version.
>> +	return 0;
>> +}
> Kevin
>
>
>
Thank you for your review.