On Tue, Jun 12, 2012 at 11:29:35PM +0200, 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> Hi Laurent, could you let me know if there is a (simple :) way for me to exercise this? > --- > drivers/mmc/host/tmio_mmc_pio.c | 18 ++++++++++-------- > 1 files changed, 10 insertions(+), 8 deletions(-) -- 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
