linux.git/drivers/mmc/core/core.c, branch v4.16

mmc: avoid removing non-removable hosts during suspend

2017-12-18T12:56:59+00:00

The Weibu F3C MiniPC has an onboard AP6255 module, presenting
two SDIO functions on a single MMC host (Bluetooth/btsdio and
WiFi/brcmfmac), and the mmc layer correctly detects this as
non-removable.

After suspend/resume, the wifi and bluetooth interfaces disappear
and do not get probed again.

The conditions here are:

 1. During suspend, we reach mmc_pm_notify()

 2. mmc_pm_notify() calls mmc_sdio_pre_suspend() to see if we can
    suspend the SDIO host. However, mmc_sdio_pre_suspend() returns
    -ENOSYS because btsdio_driver does not have a suspend method.

 3. mmc_pm_notify() proceeds to remove the card

 4. Upon resume, mmc_rescan() does nothing with this host, because of
    the rescan_entered check which aims to only scan a non-removable
    device a single time (i.e. during boot).

Fix the loss of functionality by detecting that we are unable to
suspend a non-removable host, so avoid the forced removal in that
case. The comment above this function already indicates that this
code was only intended for removable devices.

Signed-off-by: Daniel Drake 
Signed-off-by: Ulf Hansson

mmc: core: Remove code no longer needed after the switch to blk-mq

2017-12-11T12:05:58+00:00

Remove code no longer needed after the switch to blk-mq.

Signed-off-by: Adrian Hunter 
Acked-by: Linus Walleij 
Tested-by: Linus Walleij 
Signed-off-by: Ulf Hansson

mmc: core: Remove option not to use blk-mq

2017-12-11T11:55:02+00:00

Remove config option MMC_MQ_DEFAULT and parameter mmc_use_blk_mq, so that
blk-mq must be used always.

Signed-off-by: Adrian Hunter 
Acked-by: Linus Walleij 
Tested-by: Linus Walleij 
Signed-off-by: Ulf Hansson

mmc: core: Ensure cmd_completion is initialized

2017-12-11T11:48:07+00:00

mmc_test now uses mmc_start_request() to test sending commands during
"ongoing" asynchronous transfers, i.e. tests:
	Commands during non-blocking read - use Set Block Count (CMD23)
	Commands during non-blocking write - use Set Block Count (CMD23)

mmc_start_request() was not initializing cmd_completion, but cmd_completion
is used by "ongoing" transfers, so move initialization of cmd_completion
into making mmc_start_request().

Fixes: cb39f61e9b1e ("mmc: core: Export a few functions needed for blkmq support")
Signed-off-by: Adrian Hunter 
Signed-off-by: Ulf Hansson

mmc: core: Add parameter use_blk_mq

2017-12-11T11:44:33+00:00

Until mmc has blk-mq support fully implemented and tested, add a parameter
use_blk_mq, set to true if config option MMC_MQ_DEFAULT is selected, which
it is by default.

Signed-off-by: Adrian Hunter 
Acked-by: Linus Walleij 
Signed-off-by: Ulf Hansson 
Tested-by: Linus Walleij

mmc: core: Make mmc_pre_req() and mmc_post_req() available

2017-12-11T11:44:32+00:00

Make mmc_pre_req() and mmc_post_req() available to the card drivers. Later
patches will make use of this.

Signed-off-by: Adrian Hunter 
Acked-by: Linus Walleij 
Signed-off-by: Ulf Hansson 
Tested-by: Linus Walleij

mmc: add kerneldoc to mmc_regulator_get_supply()

2017-10-30T10:50:32+00:00

Especially, make clear what the return value means.

Signed-off-by: Wolfram Sang 
Signed-off-by: Ulf Hansson

mmc: core: Factor out mmc_host_set_uhs_voltage()

2017-10-30T10:45:57+00:00

Factor out mmc_host_set_uhs_voltage() so it can be reused.

Signed-off-by: Adrian Hunter 
Signed-off-by: Ulf Hansson

mmc: core: Export a few functions needed for blkmq support

2017-10-30T10:45:56+00:00

The following functions are needed by the mmc block device driver, once it
converts to blkmq, therefore let's export them.

mmc_start_bkops()
mmc_start_request()
mmc_retune_hold_now()
mmc_retune_release()

Signed-off-by: Adrian Hunter 
Reviewed-by: Linus Walleij 
Signed-off-by: Ulf Hansson

mmc: core: Add support for handling CQE requests

2017-10-30T10:45:50+00:00

Add core support for handling CQE requests, including starting, completing
and recovering.

Signed-off-by: Adrian Hunter 
Reviewed-by: Linus Walleij 
Signed-off-by: Ulf Hansson