From: Ulf Hansson ulf.hansson@linaro.org
[ Upstream commit 7c526608d5afb62cbc967225e2ccaacfdd142e9d ]
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 --- drivers/mmc/host/dw_mmc.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index eea52e2c5a0ce..79c55c7b4afd9 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -3460,6 +3460,10 @@ 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);