kernel.git/drivers/mmc/core/core.h, branch linux-3.19.y

mmc: core: consistent handling of initial values

2014-11-26T13:30:57Z

mmc_do_hw_reset(), mmc_power_up() and mmc_power_off() all set similar initial values for bus_mode, bus_width, chip_select and timing. Let's make this handling simpler and more consistent by sticking them together in a common function. This will introduce small changes in behavior in the following places: mmc_power_off(): For SPI hosts, explicitly set bus_mode = MMC_BUSMODE_PUSHPULL and chip_select = MMC_CS_HIGH, before we left them as they were. For non-SPI hosts, set bus_mode = MMC_BUSMODE_PUSHPULL instead of MMC_BUSMODE_OPENDRAIN as before. These two changes should not be a problem since the device will be powered off anyway. mmc_do_hw_reset(): Always set bus_mode = MMC_BUSMODE_PUSHPULL, as required by SD/SDIO cards. MMC cards require MMC_BUSMODE_OPENDRAIN, but this is taken care of by mmc_init_card() and mmc_attach_mmc(). Signed-off-by: Johan Rudholm Signed-off-by: Ulf Hansson

mmc: core: Let mmc_set_signal_voltage take ocr as parameter

2013-10-31T00:26:26Z

This is yet another step of restructure code to be able to fixup the setup of the negotiated ocr mask. Signed-off-by: Ulf Hansson Signed-off-by: Chris Ball

mmc: core: Let mmc_power_up|cycle take ocr as parameter

2013-10-31T00:26:25Z

As a step to fixup the setup of the negotiated ocr mask, we need the mmc_power_up|cycle functions to take the ocr as a parameter. Signed-off-by: Ulf Hansson Signed-off-by: Chris Ball

mmc: core: Extend shutdown sequence to handle bus operations

2013-06-27T16:39:18Z

By adding an optional .shutdown callback to the bus_ops struct we provide the possibility to let each bus type handle it's shutdown requirements. Signed-off-by: Ulf Hansson Signed-off-by: Chris Ball

mmc: core: Validate suspend prerequisites for SDIO at SUSPEND_PREPARE

2013-06-27T16:39:15Z

This patch moves the validation for all the suspend prerequisites to be done at SUSPEND_PREPARE notification. Previously in the SDIO case parts of the validation was done from mmc_suspend_host. This patch invents a new pre_suspend bus_ops callback and implements it for SDIO. Returning an error code from it, will mean at SUSPEND_PREPARE notification, the card will be removed before proceeding with the suspend sequence. Signed-off-by: Ulf Hansson Tested-by: Jaehoon Chung Signed-off-by: Chris Ball

mmc: core: Restructure and simplify code for mmc sleep|awake

2013-05-26T18:23:17Z

The mmc_card_sleep|awake APIs are not being used since the support is already properly encapsulated within the suspend sequence. Sleep|awake command is also specific for eMMC. We remove the sleep|awake bus_ops, the mmc_card_sleep|awake APIs and move the code into the mmc specific core instead. This also includes the mmc ops function, mmc_sleepawake. All releated functions have then become static and we have got far less code to maintain. Additionally this patch also simplifies the code from mmc_sleepawake, since it is only used to put the card to sleep and not awake. Signed-off-by: Ulf Hansson Signed-off-by: Chris Ball

mmc: core: Add bus_ops for runtime pm callbacks

2013-05-26T18:23:15Z

SDIO is the only protocol that uses runtime pm for the card device right now. To provide the option for sd and mmc to use runtime pm as well the bus_ops callback are extended with two new functions. One for runtime_suspend and one for runtime_resume. This patch will also implement the callbacks for SDIO to make sure existing functionality is maintained. It also prepares to move away from using the mmc_power_restore_host API, since it is not needed when using runtime PM. Signed-off-by: Ulf Hansson Signed-off-by: Chris Ball

mmc: core: Break out start_signal_voltage_switch

2013-02-24T19:37:07Z

Allow callers to access the start_signal_voltage_switch host_ops member without going through any cmd11 logic. This is mostly a preparation for the following signal voltage switch patch. Also, reset ios.signal_voltage to its original value if start_signal_voltage_switch fails. Signed-off-by: Johan Rudholm Acked-by: Ulf Hansson Tested-by: Wei WANG Signed-off-by: Chris Ball

mmc: core: Add mmc_power_cycle

2013-02-24T19:37:06Z

Add mmc_power_cycle which can be used to power cycle for instance SD-cards. Signed-off-by: Johan Rudholm Acked-by: Ulf Hansson Tested-by: Wei WANG Signed-off-by: Chris Ball

mmc: fix async request mechanism for sequential read scenarios

2013-02-11T18:28:49Z

When current request is running on the bus and if next request fetched by mmcqd is NULL, mmc context (mmcqd thread) gets blocked until the current request completes. This means that if new request comes in while the mmcqd thread is blocked, this new request can not be prepared in parallel to current ongoing request. This may result in delaying the new request execution and increase it's latency. This change allows to wake up the MMC thread on new request arrival. Now once the MMC thread is woken up, a new request can be fetched and prepared in parallel to the current running request which means this new request can be started immediately after the current running request completes. With this change read throughput is improved by 16%. Signed-off-by: Konstantin Dorfman Reviewed-by: Seungwon Jeon Signed-off-by: Chris Ball