linux-toradex.git/drivers/mmc/core/sdio.c, branch v3.13.7

mmc: core: Collect common code for card ocr validation

2013-10-31T00:26:31+00:00

Since mmc_select_voltage now only gets called from the attach sequence,
it makes sense to move the out of spec validations of the card ocr into
this function.

Signed-off-by: Ulf Hansson 
Signed-off-by: Chris Ball

mmc: core: Prevent violation of specs while initializing cards

2013-10-31T00:26:30+00:00

According to eMMC/SD/SDIO specs, the VDD (VCC) voltage level must be
maintained during the initialization sequence. If we want/need to tune
the voltage level, a complete power cycle of the card must be executed.

Most host drivers conforms to the specifications by only allowing to
change VDD voltage level at the MMC_POWER_UP state, but some also cares
about MMC_POWER_ON state, which they should'nt. This patch will not
break those drivers, but they could clean up code to better reflect
what is expected from the protocol layer.

A big re-work of the mmc_select_voltage function is done to only change
VDD voltage level if the host supports MMC_CAP2_FULL_PWR_CYCLE.
Otherwise only validation of the host and card ocr mask will be done.

A very nice side-effect of this patch is that we now don't need to
reset the negotiated ocr mask at the mmc_power_off function, since now
it will actually reflect the present voltage level, which safely can be
used at the next power up and re-initialization. Moreover, we then only
need to execute mmc_select_voltage from the attach sequence.

Signed-off-by: Ulf Hansson 
Signed-off-by: Chris Ball

mmc: core: Move cached value of the negotiated ocr mask to card struct

2013-10-31T00:26:29+00:00

The negotiated ocr mask is directly related to the card. Once a card
gets removed, the mask shall be dropped. By moving the cache of the ocr
mask from the host struct to the card struct we have accomplished this.

Signed-off-by: Ulf Hansson 
Signed-off-by: Chris Ball

mmc: core: Cleanup code for setting ocr mask for SDIO

2013-10-31T00:26:28+00:00

At several places in mmc_sdio_init_card function the cached mask in
host->ocr were being updated. To simplify code, we make use of an
local ocr parameter instead.

Signed-off-by: Ulf Hansson 
Signed-off-by: Chris Ball

mmc: core: Remove unnecessary retry mechanism at SDIO attach

2013-10-31T00:26:27+00:00

The retry and fallback mechanism when failing to switch to 1.8V
signaling voltage is handled by the SDIO card init function. Thus we
can remove the duplicated old code from the attach function.

Signed-off-by: Ulf Hansson 
Signed-off-by: Chris Ball

mmc: core: Let mmc_set_signal_voltage take ocr as parameter

2013-10-31T00:26:26+00:00

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

2013-10-31T00:26:25+00:00

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: Push common suspend|resume code into each bus_ops

2013-06-27T16:39:16+00:00

By moving code from the mmc_suspend|resume_host down into each
.suspend|resume bus_ops callback, we get a more flexible solution.

Some nice side effects are that we get a better understanding of each
bus_ops suspend|resume sequence and the common code don't have to take
care of specific corner cases, especially for the SDIO case.

Signed-off-by: Ulf Hansson 
Tested-by: Jaehoon Chung 
Signed-off-by: Chris Ball

mmc: core: Validate suspend prerequisites for SDIO at SUSPEND_PREPARE

2013-06-27T16:39:15+00:00

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: Add bus_ops for runtime pm callbacks

2013-05-26T18:23:15+00:00

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