linux.git/drivers/mmc/core/sd.c, branch v5.16

block: move struct request to blk-mq.h

2021-10-18T12:17:02+00:00

struct request is only used by blk-mq drivers, so move it and all
related declarations to blk-mq.h.

Signed-off-by: Christoph Hellwig 
Reviewed-by: Johannes Thumshirn 
Link: https://lore.kernel.org/r/20210920123328.1399408-18-hch@lst.de
Signed-off-by: Jens Axboe

mmc: core: Allow UHS-I voltage switch for SDSC cards if supported

2021-06-14T11:57:43+00:00

While initializing an UHS-I SD card, the mmc core first tries to switch to
1.8V I/O voltage, before it continues to change the settings for the bus
speed mode.

However, the current behaviour in the mmc core is inconsistent and doesn't
conform to the SD spec. More precisely, an SD card that supports UHS-I must
set both the SD_OCR_CCS bit and the SD_OCR_S18R bit in the OCR register
response. When switching to 1.8V I/O the mmc core correctly checks both of
the bits, but only the SD_OCR_S18R bit when changing the settings for bus
speed mode.

Rather than actually fixing the code to confirm to the SD spec, let's
deliberately deviate from it by requiring only the SD_OCR_S18R bit for both
parts. This enables us to support UHS-I for SDSC cards (outside spec),
which is actually being supported by some existing SDSC cards. Moreover,
this fixes the inconsistent behaviour.

Signed-off-by: Christian Loehle 
Link: https://lore.kernel.org/r/CWXP265MB26803AE79E0AD5ED083BF2A6C4529@CWXP265MB2680.GBRP265.PROD.OUTLOOK.COM
Cc: stable@vger.kernel.org
[Ulf: Rewrote commit message and comments to clarify the changes]
Signed-off-by: Ulf Hansson

mmc: core: Add support for cache ctrl for SD cards

2021-06-14T11:57:38+00:00

In SD spec v6.x the SD function extension registers for performance
enhancements were introduced. As a part of this an optional internal cache
on the SD card, can be used to improve performance.

The let the SD card use the cache, the host needs to enable it and manage
flushing of the cache, so let's add support for this.

Note that for an SD card supporting the cache it's mandatory for it, to
also support the poweroff notification feature. According to the SD spec,
if the cache has been enabled and a poweroff notification is sent to the
card, that implicitly also means that the card should flush its internal
cache. Therefore, dealing with cache flushing for REQ_OP_FLUSH block
requests is sufficient.

Reviewed-by: Linus Walleij 
Signed-off-by: Ulf Hansson 
Reviewed-by: Avri Altman 
Link: https://lore.kernel.org/r/20210511101359.83521-1-ulf.hansson@linaro.org

mmc: core: Add support for Power Off Notification for SD cards

2021-06-14T11:57:37+00:00

Rather than only deselecting the SD card via a CMD7, before we cut power to
it at system suspend, at runtime suspend or at shutdown, let's add support
for a graceful power off sequence via enabling the SD Power Off
Notification feature.

Note that, the Power Off Notification feature was added in the SD spec
v4.x, which is several years ago. However, it's still a bit unclear how
often the SD card vendors decides to implement support for it. To validate
these changes a Sandisk Extreme PRO A2 64GB has been used, which seems to
work nicely.

Signed-off-by: Ulf Hansson 
Acked-by: Avri Altman 
Reviewed-by: Linus Walleij 
Reviewed-by: Shawn Lin 
Link: https://lore.kernel.org/r/20210504161222.101536-12-ulf.hansson@linaro.org

mmc: core: Read performance enhancements registers for SD cards

2021-06-14T11:57:36+00:00

In SD spec v6.x the SD function extension registers for performance
enhancements were introduced. These registers let the SD card announce
supports for various performance related features, like "self-maintenance",
"cache" and "command queuing".

Let's extend the parsing of SD function extension registers and store the
information in the struct mmc_card. This prepares for subsequent changes to
implement the complete support for new the performance enhancement
features.

Signed-off-by: Ulf Hansson 
Acked-by: Avri Altman 
Reviewed-by: Linus Walleij 
Reviewed-by: Shawn Lin 
Link: https://lore.kernel.org/r/20210504161222.101536-11-ulf.hansson@linaro.org

mmc: core: Read the SD function extension registers for power management

2021-06-14T11:57:36+00:00

In the SD spec v4.0 the CMD48/49 and CMD58/59 were introduced as optional
commands. In the SD spec v4.1 the SD function extension registers were
introduced, which requires support for CMD48/49/58/59 to be read/written
from/to.

Moreover, a specific function extension register were added to let the card
announce support for optional features in regards to power management. The
features that were added are "Power Off Notification", "Power Down Mode"
and "Power Sustenance".

As a first step to support this, let's read and parse the register for
power management during the SD card initialization and store the
information about the supported features in the struct mmc_card. In this
way, we prepare for subsequent changes to implement the complete support
for the new features.

Signed-off-by: Ulf Hansson 
Reviewed-by: Linus Walleij 
Reviewed-by: Shawn Lin 
Acked-by: Avri Altman 
Link: https://lore.kernel.org/r/20210504161222.101536-10-ulf.hansson@linaro.org

mmc: core: Parse the SD SCR register for support of CMD48/49 and CMD58/59

2021-06-14T11:57:36+00:00

In SD spec v4.x the support for CMD48/49 and CMD58/59 were introduced as
optional features. To let the card announce whether it supports the
commands, the SCR register has been extended with corresponding support
bits. Let's parse and store this information for later use.

Signed-off-by: Ulf Hansson 
Reviewed-by: Linus Walleij 
Reviewed-by: Shawn Lin 
Acked-by: Avri Altman 
Link: https://lore.kernel.org/r/20210504161222.101536-9-ulf.hansson@linaro.org

mmc: core: Set read only for SD cards with permanent write protect bit

2021-03-30T09:41:59+00:00

Some of SD cards sets permanent write protection bit in their CSD register,
due to lifespan or internal problem. To avoid unnecessary I/O write
operations, let's parse the bits in the CSD during initialization and mark
the card as read only for this case.

Signed-off-by: Seunghui Lee 
Link: https://lore.kernel.org/r/20210222083156.19158-1-sh043.lee@samsung.com
Cc: stable@vger.kernel.org
Signed-off-by: Ulf Hansson

mmc: core: remove unused host parameter of mmc_sd_get_csd()

2021-02-01T10:54:48+00:00

The host parameter is not used in the body of mmc_sd_get_csd(),
so let's remove it. Update related code at the same time.

Signed-off-by: Yue Hu 
Link: https://lore.kernel.org/r/20210118084520.241-1-zbestahu@gmail.com
Signed-off-by: Ulf Hansson

mmc: sd: Use kobj_to_dev() instead of container_of()

2020-09-07T07:11:30+00:00

Use kobj_to_dev() instead of container_of()

Signed-off-by: Tian Tao 
Link: https://lore.kernel.org/r/1598230956-58523-1-git-send-email-tiantao6@hisilicon.com
Signed-off-by: Ulf Hansson