kernel/linux.git/include/linux/mmc/core.h, branch v4.10.2

mmc: mmc: Introduce mmc_abort_tuning()

2016-12-05T13:16:22+00:00

If a tuning command times out, the card could still be processing it, which will cause problems for recovery. The eMMC specification says that CMD12 can be used to stop CMD21, so add a function that does that. Signed-off-by: Adrian Hunter Signed-off-by: Ulf Hansson

mmc: core: use enum mmc_blk_status properly

2016-11-29T08:00:51+00:00

There were several instances of code using the enum mmc_blk_status by arbitrarily converting it to an int and throwing it around to different functions. This makes the code hard to understand to may give rise to strange errors. Especially the function prototype mmc_start_req() had to be modified to take a pointer to an enum mmc_blk_status and the function pointer .err_check() inside struct mmc_async_req needed to return an enum mmc_blk_status. In every case: instead of assigning the block layer error code to an int, use the enum, also change the signature of all functions actually passing this enum to use the enum. To make it possible to use the enum everywhere applicable, move it to so that all code actually using it can also see it. An interesting case was encountered in the MMC test code which did not return a enum mmc_blk_status at all in the .err_check function supposed to check whether asynchronous requests worked or not: instead it returned a normal -ERROR or even the test frameworks internal error codes. The test code would also pass on enum mmc_blk_status codes as error codes inside the test code instead of converting them to the local RESULT_* codes. I have tried to fix all instances properly and run some tests on the result. Cc: Chunyan Zhang Cc: Baolin Wang Signed-off-by: Linus Walleij Signed-off-by: Ulf Hansson

mmc: add define for R1 response without CRC

2016-09-26T19:31:31+00:00

The core uses it for polling. Give drivers a proper define handle this case like for other response types. Signed-off-by: Wolfram Sang Signed-off-by: Ulf Hansson

mmc: core: Add support for sending commands during data transfer

2016-09-26T19:31:28+00:00

A host controller driver exposes its capability using caps flag MMC_CAP_CMD_DURING_TFR. A driver with that capability can accept requests that are marked mrq->cap_cmd_during_tfr = true. Then the driver informs the upper layers when the command line is available for further commands by calling mmc_command_done(). Because of that, the driver will not then automatically send STOP commands, and it is the responsibility of the upper layer to send a STOP command if it is required. For requests submitted through the mmc_wait_for_req() interface, the caller sets mrq->cap_cmd_during_tfr = true which causes mmc_wait_for_req() in fact not to wait. The caller can then send commands that do not use the data lines. Finally the caller can wait for the transfer to complete by calling mmc_wait_for_req_done() which is now exported. For requests submitted through the mmc_start_req() interface, the caller again sets mrq->cap_cmd_during_tfr = true, but mmc_start_req() anyway does not wait. The caller can then send commands that do not use the data lines. Finally the caller can wait for the transfer to complete in the normal way i.e. calling mmc_start_req() again. Irrespective of how a cap_cmd_during_tfr request is started, mmc_is_req_done() can be called if the upper layer needs to determine if the request is done. However the appropriate waiting function (either mmc_wait_for_req_done() or mmc_start_req()) must still be called. The implementation consists primarily of a new completion mrq->cmd_completion which notifies when the command line is available for further commands. That completion is completed by mmc_command_done(). When there is an ongoing data transfer, calls to mmc_wait_for_req() will automatically wait on that completion, so the caller does not have to do anything special. Note, in the case of errors, the driver may call mmc_request_done() without calling mmc_command_done() because mmc_request_done() always calls mmc_command_done(). Signed-off-by: Adrian Hunter Signed-off-by: Ulf Hansson

mmc: core: remove the MMC_DATA_STREAM flag

2016-02-29T10:03:02+00:00

It's not set to MMC_DATA_STREAM anywhere. It seems that it had been used with CMD11/CMD20. But according to Spec, CMD11/CMD20 are obsolete command. Signed-off-by: Jaehoon Chung Signed-off-by: Ulf Hansson

mmc: mmc: extend the mmc_send_tuning()

2015-10-27T09:38:41+00:00

The mmc_execute_tuning() has already prepared the opcode, there is no need to prepare it again at mmc_send_tuning(), and, there is a BUG of mmc_send_tuning() to determine the opcode by bus width, assume eMMC was running at HS200, 4bit mode, then the mmc_send_tuning() will overwrite the opcode from CMD21 to CMD19, then got error. in addition, extend an argument of "cmd_error" to allow getting if there was cmd error when tune response. Signed-off-by: Chaotian Jing [Ulf: Rebased patch] Signed-off-by: Ulf Hansson

mmc: core: Convert __mmc_switch() into an internal core function

2015-10-26T14:59:54+00:00

As there are no users of the __mmc_switch() API, except for the mmc core itself, let's convert it from an exported function into an internal. Signed-off-by: Ulf Hansson

mmc: mediatek: Add Mediatek MMC driver

2015-06-18T07:20:48+00:00

Add Mediatek MMC driver code Support eMMC/SD/SDIO Signed-off-by: Chaotian Jing Signed-off-by: Ulf Hansson

mmc: core: Convert the error field in struct mmc_command|data into an int

2015-04-08T10:10:20+00:00

Everybody expects the error field in the struct mmc_command|data to be and int but it's actually an unsigned int. Let's convert it into an int to meet the expectations. Signed-off-by: Ulf Hansson

mmc: core: always check status after reset

2015-01-19T08:56:27+00:00

Always check if the card is alive after a successful reset. This allows us to remove mmc_hw_reset_check(), leaving mmc_hw_reset() as the only card reset interface. Signed-off-by: Johan Rudholm Signed-off-by: Ulf Hansson