linux.git/drivers/mmc/core/sd.c, branch v4.5

mmc: core: Enable tuning according to the actual timing

2016-01-14T09:59:09+00:00

While in sdhci_execute_tuning() the choice whether or not to enable the
tuning is done on the actual timing, in the mmc_sdio_init_uhs_card() the
check is done on the capability of the card.

This difference is causing some issues with some SDIO cards in DDR50
mode where the CDM19 is wrongly issued.

With this patch we modify the check in both
mmc_(sd|sdio)_init_uhs_card() functions to take the proper decision
only according to the actual timing specification.

Cc: stable@vger.kernel.org
Signed-off-by: Carlo Caione 
Signed-off-by: Ulf Hansson

mmc: sd: limit SD card power limit according to cards capabilities

2016-01-13T09:56:27+00:00

The SD card specification allows cards to error out a SWITCH command
where the requested function in a group is not supported.  The spec
provides for a set of capabilities which indicate which functions are
supported.

In the case of the power limit, requesting an unsupported power level
via the SWITCH command fails, resulting in the power level remaining at
the power-on default of 0.72W, even though the host and card may support
higher powers levels.

This has been seen with SanDisk 8GB cards, which support the default
0.72W and 1.44W (200mA and 400mA) in combination with an iMX6 host,
supporting up to 2.88W (800mA).  This currently causes us to try to set
a power limit function value of '3' (2.88W) which the card errors out
on, and thereby causes the power level to remain at 0.72W rather than
the desired 1.44W.

Arrange to limit the selected current limit by the capabilities reported
by the card to avoid the SWITCH command failing.  Select the highest
current limit that the host and card combination support.

Signed-off-by: Russell King 
Fixes: a39ca6ae0a08 ("mmc: core: Simplify and fix for SD switch processing")
Signed-off-by: Ulf Hansson

mmc: It is not an error for the card to be removed while suspended

2015-12-28T11:51:38+00:00

A card can be removed while it is runtime suspended.
Do not print an error message.

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

mmc: core: Make runtime resume default behavior for MMC/SD

2015-12-22T10:32:03+00:00

MMC_CAP_RUNTIME_RESUME was invented to decrease system PM resume time for
systems that particularly needs this. As the feature has matured let's
make it the default behavior for MMC/SD.

Signed-off-by: Ulf Hansson

mmc: skip reclaiming host on mmc_add_card() error

2015-10-26T15:00:14+00:00

There's little sense in releasing the host on mmc_add_card() error
immediately after reclaiming  it, so reclaim the host  only in case
of success.

Signed-off-by: Sergei Shtylyov 
Signed-off-by: Ulf Hansson

mmc: core: Remove MMC_CLKGATE

2015-10-26T15:00:09+00:00

MMC_CLKGATE was once invented to save power by gating the bus clock at
request inactivity. At that time it served its purpose. The modern way to
deal with power saving for these scenarios, is by using runtime PM.

Nowadays, several host drivers have deployed runtime PM, but for those
that haven't and which still cares power saving at request inactivity,
it's certainly time to deploy runtime PM as it has been around for several
years now.

To simplify code to mmc core and thus decrease maintenance efforts, this
patch removes all code related to MMC_CLKGATE.

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

mmc: core: enable CMD19 tuning for DDR50 mode

2015-10-26T15:00:03+00:00

As SD Specifications Part1 Physical Layer Specification Version
3.01 says, CMD19 tuning is available for unlocked cards in transfer
state of 1.8V signaling mode. The small difference between v3.00
and 3.01 spec means that CMD19 tuning is also available for DDR50
mode.

Signed-off-by: Weijun Yang 
Signed-off-by: Barry Song 
Signed-off-by: Ulf Hansson

mmc: sd: Remove superfluous error code assignment

2015-10-26T14:59:53+00:00

Signed-off-by: Yousong Zhou 
Signed-off-by: Ulf Hansson

mmc: core: Remove redundant ->power_restore() callback for SD

2015-06-04T08:03:51+00:00

Since the ->reset() callback is implemented for SD, the ->power_restore()
callback has become redundant, let's remove it.

Signed-off-by: Ulf Hansson

mmc: core: Record card drive strength

2015-06-01T07:07:13+00:00

In preparation for adding drive strength support
for eMMC, add drive_strength to struct mmc_card
to record the card drive strength for UHS-I modes
and HS200 / HS400. For eMMC this will be needed
when switching between HS200 and HS400.

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