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mmc: dw_mmc: Re-store SDIO IRQs mask at system resume

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[ Upstream commit 7c526608d5 ]

In cases when SDIO IRQs have been enabled, runtime suspend is prevented by
the driver. However, this still means dw_mci_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 dw_mmc
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 dw_mmc 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 dw_mmc driver, so let's do that.

Tested-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ulf Hansson
2019-09-08 12:12:27 +02:00
committed by Greg Kroah-Hartman
parent a0dd3d95fb
commit da87dfca25
1 changed files with 4 additions and 0 deletions
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4
drivers/mmc/host/dw_mmc.c
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@@ -3486,6 +3486,10 @@ int dw_mci_runtime_resume(struct device *dev)
/* Force setup bus to guarantee available clock output */
dw_mci_setup_bus(host->slot, true);
/* Re-enable SDIO interrupts. */
if (sdio_irq_claimed(host->slot->mmc))
__dw_mci_enable_sdio_irq(host->slot, 1);
/* Now that slots are all setup, we can enable card detect */
dw_mci_enable_cd(host);