From: Mark Brown <broonie@kernel.org>
To: Vladimir Oltean <olteanv@gmail.com>
Cc: Marc Kleine-Budde <mkl@pengutronix.de>,
Krzysztof Kozlowski <krzk@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Vladimir Oltean <vladimir.oltean@nxp.com>,
linux-spi <linux-spi@vger.kernel.org>,
lkml <linux-kernel@vger.kernel.org>,
Wolfram Sang <wsa@kernel.org>,
stable@vger.kernel.org,
Pengutronix Kernel Team <kernel@pengutronix.de>
Subject: Re: [PATCH v2 1/3] spi: spi-fsl-dspi: Fix external abort on interrupt in exit paths
Date: Mon, 15 Jun 2020 14:10:06 +0100 [thread overview]
Message-ID: <20200615131006.GR4447@sirena.org.uk> (raw)
In-Reply-To: <CA+h21hqC7hAenifvRqbwss=Sr+dAu3H9Dx=UF0TS0WVbkzTj2Q@mail.gmail.com>
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On Mon, Jun 15, 2020 at 03:56:01PM +0300, Vladimir Oltean wrote:
> And the down-shot is that whatever is done in dspi_remove (free_irq)
> also needs to be done in dspi_suspend, but with extra care in
> dspi_resume not only to request the irq again, but also to flush the
> module's FIFOs and clear interrupts, because there might have been
> nasty stuff uncaught during sleep:
> regmap_update_bits(dspi->regmap, SPI_MCR,
> SPI_MCR_CLR_TXF | SPI_MCR_CLR_RXF,
> SPI_MCR_CLR_TXF | SPI_MCR_CLR_RXF);
> regmap_write(dspi->regmap, SPI_SR, SPI_SR_CLEAR);
> So it's pretty messy.
It's a bit unusual to need to actually free the IRQ over suspend -
what's driving that requirement here? I can see we might need to
reinit the hardware but usually the interrupt handler can be left there
safely.
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next prev parent reply other threads:[~2020-06-15 13:10 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-15 8:07 [PATCH v2 1/3] spi: spi-fsl-dspi: Fix external abort on interrupt in exit paths Krzysztof Kozlowski
2020-06-15 8:07 ` [PATCH v2 2/3] spi: spi-fsl-dspi: Initialize completion before possible interrupt Krzysztof Kozlowski
2020-06-15 8:07 ` [PATCH v2 3/3] genirq: Do not test disabled IRQs with DEBUG_SHIRQ Krzysztof Kozlowski
2020-06-15 12:08 ` Mark Brown
2020-06-16 10:11 ` Krzysztof Kozlowski
2020-06-16 10:39 ` Mark Brown
2020-06-17 9:30 ` Thomas Gleixner
2020-06-15 8:17 ` [PATCH v2 1/3] spi: spi-fsl-dspi: Fix external abort on interrupt in exit paths Marc Kleine-Budde
2020-06-15 9:23 ` Vladimir Oltean
2020-06-15 13:08 ` Krzysztof Kozlowski
2020-06-15 12:30 ` Mark Brown
2020-06-15 12:56 ` Vladimir Oltean
2020-06-15 13:10 ` Mark Brown [this message]
2020-06-15 13:12 ` Vladimir Oltean
2020-06-15 13:24 ` Mark Brown
2020-06-15 13:29 ` Vladimir Oltean
2020-06-15 13:36 ` Mark Brown
2020-06-15 13:41 ` Krzysztof Kozlowski
2020-06-15 14:23 ` Vladimir Oltean
2020-06-15 14:57 ` Krzysztof Kozlowski
2020-06-15 14:59 ` Vladimir Oltean
2020-06-15 13:10 ` Krzysztof Kozlowski
2020-06-15 13:14 ` Vladimir Oltean
2020-06-15 13:28 ` Krzysztof Kozlowski
2020-06-15 13:33 ` Vladimir Oltean
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