[PATCH] ASoC: fsl_xcvr: disable all interrupts when suspend happens
There is an unhandled interrupt after suspend, which cause endless interrupt when system resume, so system may hang.
Disable all interrupts in runtime suspend callback to avoid above issue.
Signed-off-by: Shengjiu Wang shengjiu.wang@nxp.com --- sound/soc/fsl/fsl_xcvr.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/sound/soc/fsl/fsl_xcvr.c b/sound/soc/fsl/fsl_xcvr.c index df7c189d97dd..37b4fdb236ee 100644 --- a/sound/soc/fsl/fsl_xcvr.c +++ b/sound/soc/fsl/fsl_xcvr.c @@ -1233,6 +1233,11 @@ static __maybe_unused int fsl_xcvr_runtime_suspend(struct device *dev) struct fsl_xcvr *xcvr = dev_get_drvdata(dev); int ret;
+ ret = regmap_update_bits(xcvr->regmap, FSL_XCVR_EXT_IER0, + FSL_XCVR_IRQ_EARC_ALL, 0); + if (ret < 0) + dev_err(dev, "Failed to clear IER0: %d\n", ret); + /* Assert M0+ reset */ ret = regmap_update_bits(xcvr->regmap, FSL_XCVR_EXT_CTRL, FSL_XCVR_EXT_CTRL_CORE_RESET,
Hi Shengjiu,
On Fri, Jun 18, 2021 at 7:10 AM Shengjiu Wang shengjiu.wang@nxp.com wrote:
There is an unhandled interrupt after suspend, which cause endless interrupt when system resume, so system may hang.
Disable all interrupts in runtime suspend callback to avoid above issue.
Fixe tag?
ret = regmap_update_bits(xcvr->regmap, FSL_XCVR_EXT_IER0,FSL_XCVR_IRQ_EARC_ALL, 0);if (ret < 0)dev_err(dev, "Failed to clear IER0: %d\n", ret);
The operations in _suspend() are usually balanced with the ones in _resume().
Shouldn't you enable the interrupts in resume() then?
I see that the interrupts are currently enabled inside fsl_xcvr_prepare().
Hi Fabio
On Fri, Jun 18, 2021 at 7:21 PM Fabio Estevam festevam@gmail.com wrote:
Hi Shengjiu,
On Fri, Jun 18, 2021 at 7:10 AM Shengjiu Wang shengjiu.wang@nxp.com wrote:
There is an unhandled interrupt after suspend, which cause endless interrupt when system resume, so system may hang.
Disable all interrupts in runtime suspend callback to avoid above issue.
Fixe tag?
ok, I will add it.
ret = regmap_update_bits(xcvr->regmap, FSL_XCVR_EXT_IER0,FSL_XCVR_IRQ_EARC_ALL, 0);if (ret < 0)dev_err(dev, "Failed to clear IER0: %d\n", ret);The operations in _suspend() are usually balanced with the ones in _resume().
Shouldn't you enable the interrupts in resume() then?
No, as you said below, the interrupts are enabled in fsl_xcvr_prepare(). so this change should not block anything.
I see that the interrupts are currently enabled inside fsl_xcvr_prepare().
On Fri, Jun 18, 2021 at 07:30:25PM +0800, Shengjiu Wang wrote:
On Fri, Jun 18, 2021 at 7:21 PM Fabio Estevam festevam@gmail.com wrote:
The operations in _suspend() are usually balanced with the ones in _resume().
Shouldn't you enable the interrupts in resume() then?
No, as you said below, the interrupts are enabled in fsl_xcvr_prepare(). so this change should not block anything.
Might be worth a comment explaining why there's the asymmetry.
On Fri, 18 Jun 2021 17:51:16 +0800, Shengjiu Wang wrote:
There is an unhandled interrupt after suspend, which cause endless interrupt when system resume, so system may hang.
Disable all interrupts in runtime suspend callback to avoid above issue.
Applied to
https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next
Thanks!
[1/1] ASoC: fsl_xcvr: disable all interrupts when suspend happens commit: ea837090b388245744988083313f6e9c7c9b9699
All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted.
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Thanks, Mark
participants (4)
-
Fabio Estevam -
Mark Brown -
Shengjiu Wang -
Shengjiu Wang