Laurent Pinchart wrote: > > The tmio_mmc_set_ios() function configures the MMC power, clock and bus > width. When the mmc core requests the driver to power off the card, we > inform runtime PM, that the controller can be suspended. This can lead > to the MSTP clock being turned off. > > Writing to any 16-bit hardware registers with the MSTP clock off leads > to timeouts and errors being printed to the kernel log. This can occur > both when stopping the MMC clock and when configuring the bus width. > > To fix this, stop the MMC clock before calling put_runtime_pm(), and > skip bus width configuration when power is off. > > Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> > --- This patch solved kzm9g MicroSD hang-up issue. Tested-by: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx> Best regards --- Kuninori Morimoto -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
