linux-toradex.git/drivers/mmc/core/mmc.c, branch v3.10.94

mmc: core: Fix bit width test failing on old eMMC cards

2013-04-04T19:33:29+00:00

PARTITION_SUPPORT needs to be set before doing the compare on version
number so the bit width test does not get invalid data.  Before this
patch, a Sandisk iNAND eMMC card would detect 1-bit width although
the hardware supports 4-bit.

Only affects old emmc devices - pre 4.4 devices.

Reported-by: Elad Yi 
Signed-off-by: Philip Rakity 
Cc: stable 
Signed-off-by: Chris Ball

mmc: core: Add in support to expose PRV for v4 MMCs

2013-03-22T16:10:42+00:00

The JEDEC MMC v4 spec defines a new PRV value in place of the original
fwrev and hwrev specified in v1. We can expose this in the kernel to enable
user space to more easily determine the product revision of a given MMC.

Signed-off-by: Bernie Thompson 
Reviewed-by: Ulf Hansson 
Signed-off-by: Chris Ball

mmc: add packed command feature of eMMC4.5

2013-02-24T19:37:15+00:00

This patch adds packed command feature of eMMC4.5.  The maximum number
for packing read (or write) is offered and exception event relevant to
packed command which is used for error handling is enabled. If host
wants to use this feature, MMC_CAP2_PACKED_CMD should be set.

Signed-off-by: Seungwon Jeon 
Reviewed-by: Maya Erez 
Reviewed-by: Subhash Jadavani 
Reviewed-by: Namjae Jeon 
Signed-off-by: Chris Ball

mmc: core: Break out start_signal_voltage_switch

2013-02-24T19:37:07+00:00

Allow callers to access the start_signal_voltage_switch host_ops
member without going through any cmd11 logic. This is mostly a
preparation for the following signal voltage switch patch.

Also, reset ios.signal_voltage to its original value if
start_signal_voltage_switch fails.

Signed-off-by: Johan Rudholm 
Acked-by: Ulf Hansson 
Tested-by: Wei WANG 
Signed-off-by: Chris Ball

mmc: core: expose RPMB partition only for CMD23 capable hosts

2013-02-24T19:37:05+00:00

SET_BLOCK_COUNT CMD23 is needed for all access to RPMB partition.  If
block count is not set by CMD23, all subsequent read/write commands fail
as per eMMC specification. So, If the host does not support CMD23, do not
expose RPMB partition.

Accessing RPMB partition can cause hang / huge delay for hosts which do
not support CMD23.

Signed-off-by: Balaji T K 
Reported-and-Tested-by: Peter Ujfalusi 
Cc: stable 
Signed-off-by: Chris Ball

mmc: core: move the cache disabling operation to mmc_suspend

2013-02-24T19:37:00+00:00

Cache control is an eMMC feature and in therefore should be
part of MMC's bus resume operations, performed in mmc_suspend,
rather than in the generic mmc_suspend_host().

Signed-off-by: Maya Erez 
Acked-by: Ulf Hansson 
Signed-off-by: Chris Ball

mmc: Limit MMC speed to 52MHz if not HS200

2012-12-06T18:55:11+00:00

If "caps2" host capabilities does not indicate support for MMC
HS200, don't allow clock speeds >52MHz. Currently, for MMC, the
clock speed is set to the lesser of the max speed the eMMC module
supports (card->ext_csd.hs_max_dtr) or the max base clock of the
host controller (host->f_max based on BASE_CLK_FREQ in the host
CAPS register). This means that a host controller that doesn't
support HS200 mode but has a base clock of 100MHz and an eMMC module
that supports HS200 speeds will end up using a 100MHz clock.

Signed-off-by: Al Cooper 
Signed-off-by: Chris Ball

mmc: core: Extend sysfs to ext_csd parameters for RPMB support

2012-12-06T18:54:48+00:00

Extend current sysfs access to ext_csd rpmb parameters (RPMB partition
size) and rel_sector information.

Signed-off-by: Loic Pallardy 
Reviewed-by: Namjae Jeon 
Acked-by: Linus Walleij 
Acked-by: Johan Rudholm 
Acked-by: Krishna Konda 
Signed-off-by: Chris Ball

mmc: core: Expose access to RPMB partition

2012-12-06T18:54:46+00:00

Following JEDEC standard, if the mmc supports RPMB partition,
a new interface is created and exposed via /dev/block.
Users will be able to access RPMB partition using standard
mmc IOCTL commands.

Signed-off-by: Alex Macro 
Signed-off-by: Loic Pallardy 
Reviewed-by: Namjae Jeon 
Acked-by: Linus Walleij 
Acked-by: Johan Rudholm 
Acked-by: Krishna Konda 
Signed-off-by: Chris Ball

mmc: Standardise capability type

2012-12-06T18:54:44+00:00

There are discrepancies with regards to how MMC capabilities
are carried throughout the subsystem. Let's standardise them
to eliminate any confusion.

Signed-off-by: Lee Jones 
Signed-off-by: Chris Ball