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

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Message-ID: <54472740.2000006@rock-chips.com>
Date:	Wed, 22 Oct 2014 11:40:48 +0800
From:	Hong jinkun <jinkun.hong@...k-chips.com>
To:	Kevin Hilman <khilman@...nel.org>
CC:	linus.walleij@...aro.org, linux-arm-kernel@...ts.infradead.org,
	Russell King <linux@....linux.org.uk>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Grant Likely <grant.likely@...aro.org>,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	Randy Dunlap <rdunlap@...radead.org>,
	linux-doc@...r.kernel.org, dianders@...omium.org,
	Heiko Stuebner <heiko@...ech.de>,
	linux-rockchip@...ts.infradead.org,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Jack Dai <jack.dai@...k-chips.com>
Subject: Re: [PATCH v4 1/3] power-domain: add power domain drivers for Rockchip
 platform


在 2014/10/21 5:31, Kevin Hilman 写道:
> "jinkun.hong" <jinkun.hong@...k-chips.com> writes:
>
>> From: "jinkun.hong" <jinkun.hong@...k-chips.com>
>>
>> Add power domain drivers based on generic power domain for Rockchip platform,
>> and support RK3288.
>>
>> Signed-off-by: Jack Dai <jack.dai@...k-chips.com>
>> Signed-off-by: jinkun.hong <jinkun.hong@...k-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.

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