linux.git/drivers/mmc/core/sd.c, branch v4.9 Linux kernel source tree mmc: sd: Export SD Status via “ssr” device attribute 2016-09-26T19:31:09+00:00 Uri Yanai uri.yanai@sandisk.com 2016-08-14T08:46:36+00:00 5275a652d296711aaf7f2f4173c8db153e5777c3 The SD Status register contains several important fields related to the SD Card proprietary features. Those fields may be used by user space applications for vendor specific usage. None of those fields are exported today by the driver to user space. In this patch, we are reading the SD Status register and exporting (using MMC_DEV_ATTR) the SD Status register to the user space. Signed-off-by: Uri Yanai <uri.yanai@sandisk.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> 
The SD Status register contains several important fields related to the
SD Card proprietary features.
Those fields may be used by user space applications for vendor specific
usage.
None of those fields are exported today by the driver to user space.
In this patch, we are reading the SD Status register and exporting
(using MMC_DEV_ATTR) the SD Status register to the user space.

Signed-off-by: Uri Yanai <uri.yanai@sandisk.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
mmc: core: Extend sysfs with DSR register 2016-07-25T08:34:51+00:00 Bojan Prtvar prtvar.b@gmail.com 2016-07-19T09:16:38+00:00 6825a606584cec455b003afec7c10a07e563c994 Export DSR register through sysfs same as we did for the CID, CSD and OCR registers. Signed-off-by: Bojan Prtvar <prtvar.b@gmail.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> 
Export DSR register through sysfs same as we did for the CID, CSD and
OCR registers.

Signed-off-by: Bojan Prtvar <prtvar.b@gmail.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
mmc: core: Extend sysfs with OCR register 2016-07-25T08:34:48+00:00 Bojan Prtvar prtvar.b@gmail.com 2016-07-04T11:56:55+00:00 5fb06af7a33b4b5cedccedb611cf77568163027b Registers CID and CSD are already exported through sysfs so let's make this interface complete by adding missing OCR register. Signed-off-by: Bojan Prtvar <prtvar.b@gmail.com> Reviewed-by: Wolfram Sang <wsa@the-dreams.de> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> 
Registers CID and CSD are already exported through sysfs so let's make
this interface complete by adding missing OCR register.

Signed-off-by: Bojan Prtvar <prtvar.b@gmail.com>
Reviewed-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
mmc: core: remove redundant memset of mmc_decode_cid 2016-03-17T13:54:41+00:00 Shawn Lin shawn.lin@rock-chips.com 2016-03-11T16:35:45+00:00 0076c71e37cc9f3f0b1c0c83f9f26f31a47222b0 When initializing sd or sdio card, we get struct mmc_card from mmc_alloc_card which allocates it by kzalloc. So we don't need another memset while decoding cid. Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> 
When initializing sd or sdio card, we get struct mmc_card
from mmc_alloc_card which allocates it by kzalloc. So we don't
need another memset while decoding cid.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
mmc: core: Enable tuning according to the actual timing 2016-01-14T09:59:09+00:00 Carlo Caione carlo@endlessm.com 2016-01-13T08:36:55+00:00 e10c321977091f163eceedec0650e0ef4b3cf4bb 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 <carlo@endlessm.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> 
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 <carlo@endlessm.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
mmc: sd: limit SD card power limit according to cards capabilities 2016-01-13T09:56:27+00:00 Russell King rmk+kernel@arm.linux.org.uk 2016-01-02T10:06:29+00:00 d9812780a020bcec44565b5950b2a8b31afb5545 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 <rmk+kernel@arm.linux.org.uk> Fixes: a39ca6ae0a08 ("mmc: core: Simplify and fix for SD switch processing") Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> 
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 <rmk+kernel@arm.linux.org.uk>
Fixes: a39ca6ae0a08 ("mmc: core: Simplify and fix for SD switch processing")
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
mmc: It is not an error for the card to be removed while suspended 2015-12-28T11:51:38+00:00 Adrian Hunter adrian.hunter@intel.com 2015-12-14T13:51:27+00:00 520322d92eab66b6fee562557fdd201b01cd6240 A card can be removed while it is runtime suspended. Do not print an error message. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> 
A card can be removed while it is runtime suspended.
Do not print an error message.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
mmc: core: Make runtime resume default behavior for MMC/SD 2015-12-22T10:32:03+00:00 Ulf Hansson ulf.hansson@linaro.org 2015-11-05T15:01:32+00:00 c29536e85b5f7cf42b2e761f7ff35bc97de7cf95 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 <ulf.hansson@linaro.org> 
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 <ulf.hansson@linaro.org>
mmc: skip reclaiming host on mmc_add_card() error 2015-10-26T15:00:14+00:00 Sergei Shtylyov sergei.shtylyov@cogentembedded.com 2015-10-14T20:53:03+00:00 2860d060ac902df0164cc9580f843b101e27a2c6 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 <sergei.shtylyov@cogentembedded.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> 
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 <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
mmc: core: Remove MMC_CLKGATE 2015-10-26T15:00:09+00:00 Ulf Hansson ulf.hansson@linaro.org 2015-10-02T08:56:11+00:00 9eadcc0581a8ccaf4c2378aa1c193fb164304f1d 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 <ulf.hansson@linaro.org> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> 
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 <ulf.hansson@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>