linux-kernel - Re: [PATCHv4 2/3] drivers: spi: Add qspi flash controller

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Date:	Thu, 18 Jul 2013 20:25:05 +0530
From:	Sourav Poddar <sourav.poddar@...com>
To:	Mark Brown <broonie@...nel.org>
CC:	Felipe Balbi <balbi@...com>,
	<spi-devel-general@...ts.sourceforge.net>,
	<grant.likely@...aro.org>, <rnayak@...com>,
	<linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv4 2/3] drivers: spi: Add qspi flash controller

Hi Mark,
On Thursday 18 July 2013 08:12 PM, Mark Brown wrote:
> On Thu, Jul 18, 2013 at 04:31:58PM +0300, Felipe Balbi wrote:
>> On Thu, Jul 18, 2013 at 02:18:22PM +0100, Mark Brown wrote:
>>> So why do we report that we handled the interrupt then?  Shouldn't we at
>>> least warn if we're getting spurious IRQs?
>> not spurious. OMAP has two sets of IRQ status registers. One is call
>> IRQSTATUS$n (n = 0, 1, ...) and IRQSTATUS_RAW$n.
>> IRQSTATUS$n will only enable the bits which fired IRQs and aren't
>> masked while IRQSTATUS_RAW$n will also enable the bits which are masked.
>> I could never come up with a use case where we would need to handle IRQs
>> which we decided to mask, but perhaps there might be some cases, I don't
>> know.
>> Based on that, I believe Sourav is reading IRQSTATUS_RAW$n, then he need
>> to clear the masked bits.
> That's not the issue - the issue is that if none of the unmasked
> interrupts are being asserted we shouldn't be in the interrupt handler
> in the first place but the driver silently accepts that and reports that
> it handled the interrupt.
I believe this is what you hinted at doing..

there is a QSPI_INTR_STATUS_ENABLED_CLEAR register, which indicated the 
interrupt
status.
if nothing is set in the above register, I should return IRQ_NONE.
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