linux-toradex.git/drivers/mmc/core/bus.c, branch v3.11

Merge tag 'mmc-updates-for-3.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc

2013-07-10T18:16:00+00:00

Pull MMC updates from Chris Ball:
 "MMC highlights for 3.11:

  Core:
   - Add support for eMMC 5.1 devices
   - Add MMC_CAP_AGGRESSIVE_PM capability for aggressive power
     management of eMMC/SD between requests, using runtime PM
   - Add an ioctl to perform the eMMC 4.5 Sanitize command.  Sample code
     at:

       git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc-utils.git

  Drivers:
   - dw_mmc: Add support for Rockchip's Cortex-A9 SoCs
   - dw_mmc: Add support for Altera SoCFPGAs
   - sdhci-esdhc-imx: Add support for 8-bit bus width, non-removable
     cards
   - sdhci-bcm-kona: New driver for Broadcom Kona (281xx) SoCs
   - sdhi/tmio: Add DT DMA support"

* tag 'mmc-updates-for-3.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc: (87 commits)
  mmc: bcm281xx SDHCI driver
  mmc: sdhci: add card_event callback to sdhci
  mmc: core: Fixup Oops for SDIO shutdown
  mmc: sdhci-pci: add another device id
  mmc: esdhc: Fix bug when writing to SDHCI_HOST_CONTROL register
  mmc: esdhc: Add support for 8-bit bus width and non-removable card
  mmc: core: production year for eMMC 4.41 and later
  mmc: omap: remove unnecessary #if 0's
  mmc: sdhci: fix ctrl_2 on super-speed selection
  mmc: dw_mmc-pltfm: add Rockchip variant
  mmc: dw_mmc-pltfm: move probe and remove below dt match table
  mmc: dw_mmc-pltfm: remove static from dw_mci_pltfm_remove
  mmc: sdhci-acpi: add support for eMMC hardware reset for HID 80860F14
  mmc: sdhci-pci: add support for eMMC hardware reset for BYT eMMC.
  mmc: dw_mmc: Add support DW SD/MMC driver on SOCFPGA
  mmc: sdhci: fix caps2 for HS200
  sdhci-pxav3: Fix runtime PM initialization
  mmc: core: Add DT-bindings for MMC_CAP2_FULL_PWR_CYCLE
  mmc: core: Invent MMC_CAP2_FULL_PWR_CYCLE
  mmc: core: Enable power_off_notify for eMMC shutdown sequence
  ...

mmc: core: Fixup Oops for SDIO shutdown

2013-07-05T16:51:22+00:00

Commit "mmc: core: Handle card shutdown from mmc_bus" introduced an
Oops in the shutdown sequence for SDIO.

The drv pointer, does not exist for SDIO since the probing of the SDIO
card from the mmc_bus perspective is expected to fail by returning
-ENODEV.

This patch adds the proper check for the pointer before calling it.

Signed-off-by: Ulf Hansson 
Reported-by: Stephen Warren 
Reported-by: Tuomas Tynkkynen 
Tested-by: Tuomas Tynkkynen 
Acked-by: Jaehoon Chung 
Signed-off-by: Chris Ball

mmc: core: Extend shutdown sequence to handle bus operations

2013-06-27T16:39:18+00:00

By adding an optional .shutdown callback to the bus_ops struct we
provide the possibility to let each bus type handle it's shutdown
requirements.

Signed-off-by: Ulf Hansson 
Signed-off-by: Chris Ball

mmc: core: Handle card shutdown from mmc_bus

2013-06-27T16:39:18+00:00

Considering shutdown of the card, the responsibility to initate this
sequence shall be driven from the mmc_bus.

This patch enables the mmc_bus to handle this sequence properly. A new
.shutdown callback is added in the mmc_driver struct which is used to
shutdown the blk device.

Signed-off-by: Ulf Hansson 
Signed-off-by: Chris Ball

mmc: core: Initiate suspend|resume from mmc bus instead of mmc host

2013-06-27T16:39:17+00:00

The host should be responsible to suspend|resume the host and not the
card. This patch changes this behaviour, by moving the responsiblity
to the mmc bus instead which already holds the card device.

The exported functions mmc_suspend|resume_host are now to be considered
as depcrecated. Once all host drivers moves away from using them, we
can remove them. As of now, a successful error code is always returned.

Signed-off-by: Ulf Hansson 
Tested-by: Jaehoon Chung 
Signed-off-by: Chris Ball

PM / Runtime: Rework the "runtime idle" helper routine

2013-06-03T19:49:52+00:00

The "runtime idle" helper routine, rpm_idle(), currently ignores
return values from .runtime_idle() callbacks executed by it.
However, it turns out that many subsystems use
pm_generic_runtime_idle() which checks the return value of the
driver's callback and executes pm_runtime_suspend() for the device
unless that value is not 0.  If that logic is moved to rpm_idle()
instead, pm_generic_runtime_idle() can be dropped and its users
will not need any .runtime_idle() callbacks any more.

Moreover, the PCI, SCSI, and SATA subsystems' .runtime_idle()
routines, pci_pm_runtime_idle(), scsi_runtime_idle(), and
ata_port_runtime_idle(), respectively, as well as a few drivers'
ones may be simplified if rpm_idle() calls rpm_suspend() after 0 has
been returned by the .runtime_idle() callback executed by it.

To reduce overall code bloat, make the changes described above.

Tested-by: Mika Westerberg 
Tested-by: Kevin Hilman 
Signed-off-by: Rafael J. Wysocki 
Acked-by: Kevin Hilman 
Reviewed-by: Ulf Hansson 
Acked-by: Alan Stern

mmc: core: Add bus_ops for runtime pm callbacks

2013-05-26T18:23:15+00:00

SDIO is the only protocol that uses runtime pm for the card device
right now. To provide the option for sd and mmc to use runtime pm as
well the bus_ops callback are extended with two new functions. One for
runtime_suspend and one for runtime_resume.

This patch will also implement the callbacks for SDIO to make sure
existing functionality is maintained. It also prepares to move
away from using the mmc_power_restore_host API, since it is not
needed when using runtime PM.

Signed-off-by: Ulf Hansson 
Signed-off-by: Chris Ball

mmc: fix async request mechanism for sequential read scenarios

2013-02-11T18:28:49+00:00

When current request is running on the bus and if next request fetched
by mmcqd is NULL, mmc context (mmcqd thread) gets blocked until the
current request completes. This means that if new request comes in while
the mmcqd thread is blocked, this new request can not be prepared in
parallel to current ongoing request. This may result in delaying the new
request execution and increase it's latency.

This change allows to wake up the MMC thread on new request arrival.
Now once the MMC thread is woken up, a new request can be fetched and
prepared in parallel to the current running request which means this new
request can be started immediately after the current running request
completes.

With this change read throughput is improved by 16%.

Signed-off-by: Konstantin Dorfman 
Reviewed-by: Seungwon Jeon 
Signed-off-by: Chris Ball

mmc: Remove redundant null check before kfree in bus.c

2012-12-06T18:55:07+00:00

kfree on a null pointer is a no-op.

Signed-off-by: Sachin Kamat 
Signed-off-by: Chris Ball

mmc: core: check PM_SLEEP for mmc_bus_suspend/resume callbacks

2012-04-23T12:11:28+00:00

If PM_SLEEP is not enabled, mmc.c will give warnning since mmc_bus_suspend/
mmc_bus_resume functions are defined but not used. This patch can fix this
warnning.

Reported-by: Andrew Lunn 
Signed-off-by: Chuanxiao Dong 
Signed-off-by: Chris Ball