On 13 October 2016 at 13:37, Ulf Hansson <ulf.hans...@linaro.org> wrote:
> The rtsx_usb_sdmmc (mmc/sd) and rtsx_usb_ms (memstick) devices are interfacing
> an rtsx_usb device (managed by an mfd driver) while communicating with the
> cards. The mmc/sd and memstick devices are children of the usb device.
> Issues has been reported  for rtsx, which have been investigated,
> fixed, tested, etc, particularly when using mmc/sd cards. During the
> investigation, some changes was proposed and tested successfully. In this
> series I have picked up these changes and created some proper patches with
> It turned out that most of the problems was related to the runtime PM
> deployment in the memstick and the mmc/sd driver, which are fixed in this
> A couple of more issues were also discussed , which needs to be fixed as
> well. Although they are out of scope for this series, so we will have to look
> into those at a later point. Here's a brief summary of these leftovers:
> It seems reasonable to turn off autosuspend for usb devices and instead rely
> the usb device's children to deal with autosuspend. The reason is simply that
> the children has better knowledge of when using autosuspend makes sense.
> Polling card detect mode is used both for mmc/sd and memstick. Because of the
> lack of synchronization between the polling attempts for these subsystems, the
> usb device may be powered on for unnecessary long intervals, thus we are
> wasting power.
> Besides the above changes, I folded in a change in the mmc core which improves
> the behaviour for mmc hosts using MMC_CAP2_NO_PRESCAN_POWERUP, which is the
> case for the rtsx_usb_sdmmc driver. This change should improve the boot time
> with ~100ms per rtsx_usb_sdmmc device.
> Finally, as I couldn't find an active maintainer for the memstick
> subsystem/driver and because the author of the drivers can be reached, I
> volunteer to take this all through my mmc tree. Please tell me if that is
> problem to any of you.
> Alan Stern (1):
> memstick: rtsx_usb_ms: Runtime resume the device when polling for
> Ulf Hansson (5):
> mmc: rtsx_usb_sdmmc: Avoid keeping the device runtime resumed when
> mmc: rtsx_usb_sdmmc: Handle runtime PM while changing the led
> memstick: rtsx_usb_ms: Manage runtime PM when accessing the device
> mmc: rtsx_usb_sdmmc: Enable runtime PM autosuspend
> mmc: core: Don't power off the card when starting the host
> drivers/memstick/host/rtsx_usb_ms.c | 6 ++++++
> drivers/mmc/core/core.c | 9 ++++-----
> drivers/mmc/host/rtsx_usb_sdmmc.c | 10 +++++-----
> 3 files changed, 15 insertions(+), 10 deletions(-)
Patch 1->4 applied for fixes. Holding patch 5->6 for a while, as they
are intended for next!