Typically an sd/mmc card takes around 200 - 1100 ms to initialize when the power to the card has been cut, which is what happens during a suspend/resume sequence. All device's resume time adds up to the total kernel resume time. Some use cases requires the kernel to be resumed fast, to be able to meet deadlines. One use case example is WLAN SOFT_AP, but there are certainly more. This patch serie deferres the resume for mmc/sd cards into a delayed work to be able to respond quickly on the suspend request. Earlier the blkdev were issuing a set_blksize as a part of the blkdev resume, which right now is removed since it is not needed. In future, if other block sizes than 512 bytes is used, this needs to be re-implemented in a different manner. A deferred resume feature has been discussed on the mmc-list previously but did not end up in a final patch/solution. Ulf Hansson (2): mmc: block: Remove use of mmc_blk_set_blksize mmc: Minimize resume-time by deferring resume drivers/mmc/card/block.c | 35 +++++++++-------------------------- drivers/mmc/core/core.c | 36 +++++++++++++++++++++++++++++++++++- drivers/mmc/core/core.h | 1 + drivers/mmc/core/host.c | 1 + include/linux/mmc/host.h | 16 ++++++++++++++++ 5 files changed, 62 insertions(+), 27 deletions(-) -- 1.7.5.4 -- 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
