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mmc: mtk-sd: Re-store SDIO IRQs mask at system resume

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In cases when SDIO IRQs have been enabled, runtime suspend is prevented by
the driver. However, this still means msdc_runtime_suspend|resume() gets
called during system suspend/resume, via pm_runtime_force_suspend|resume().

This means during system suspend/resume, the register context of the mtk-sd
device most likely loses its register context, even in cases when SDIO IRQs
have been enabled.

To re-enable the SDIO IRQs during system resume, the mtk-sd driver
currently relies on the mmc core to re-enable the SDIO IRQs when it resumes
the SDIO card, but this isn't the recommended solution. Instead, it's
better to deal with this locally in the mtk-sd driver, so let's do that.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Ulf Hansson 2019-09-11 14:09:20 +02:00
parent 7c526608d5
commit 1c81d69d4c
1 changed files with 3 additions and 0 deletions
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3
drivers/mmc/host/mtk-sd.c
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@ -2435,6 +2435,9 @@ static void msdc_restore_reg(struct msdc_host *host)
} else {
writel(host->save_para.pad_tune, host->base + tune_reg);
}
if (sdio_irq_claimed(host->mmc))
__msdc_enable_sdio_irq(host, 1);
}
static int msdc_runtime_suspend(struct device *dev)