linux-toradex.git/drivers/mmc/core/sd.c, branch v4.4.73

mmc: core: Enable tuning according to the actual timing

2016-03-03T23:07:15+00:00

commit e10c321977091f163eceedec0650e0ef4b3cf4bb upstream.

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.

Signed-off-by: Carlo Caione 
Signed-off-by: Ulf Hansson 
Signed-off-by: Greg Kroah-Hartman

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

mmc: core: Factor out common code in drive strength selection

2015-06-01T07:07:12+00:00

Make a new function out of common code used for drive
strength selection.

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

mmc: core: Add 'card' to drive strength selection callback

2015-06-01T07:07:12+00:00

In preparation for supporting also eMMC drive strength,
add the 'card' as a parameter so that the callback can
distinguish different types of cards if necessary.

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

mmc: core: Simplify card drive strength mask

2015-06-01T07:07:11+00:00

Card drive strength selection uses a callback to
which a mask of supported drive strengths is passed.
Currently, the bits are checked against the values
in the SD specifications. That is not necessary
because the callback will anyway match the mask
against a valid value. Simplify by taking the mask
as is but still ensuring that the default mandatory
value (type B) is always supported.

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