mmc: sdhci-msm: set core in proper mode before reset

During probe disable the HC mode since the reset is done in
SDCC mode. HC mode will get set after the reset is complete
before the rest of the initialization is done.

CRs-Fixed: 538028
Change-Id: I1fdc633c218447c15c8caad24e2805e7510088f2
Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
mmc: core: disable runtime PM for sdio cards

This patch disables runtime PM for sdio cards because
the runtime PM is managed by the respective SDIO function
drivers.
The card device (if sdio card) is set as runtime active
however, the runtime PM is not enabled for the same.
The runtime PM framework ensures that a device's
parents' cannot be suspended till all of its children
are suspended.

Change-Id: Ie0778d96f91738fc14a0dc05a3430c1f382ef13c
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
mmc: core: Add support for HS400

HS400 is a new bus speed mode introduced in eMMC5.0 specification. This
patch adds the capability in mmc core to switch to HS400 mode when both
the host and the card supports it.

Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>
mmc: sdhci: Add HS400 host layer support

HS400 bus speed mode also requires tuning to be performed as done in
HS200 mode. Add the capability in host layer to perform tuning for
HS400 too.

Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>
mmc: sdhci-msm: Add HS400 platform support

The following msm platform specific changes are added to support HS400.
- Enable CDC calibration fixed feedback and sleep clock.
- Allow tuning for HS400 mode.
- Add capability to parse and configure pull settings for RCLK pin.
- Configure HS400 timing mode using the VENDOR_SPECIFIC_FUNC register.

Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>
mmc: sdhci-msm: Add calibration tuning for CDCLP533 circuit

In HS400 mode a new RCLK is introduced on the interface for read data
transfers. The eMMC5.0 device transmits the read data to the host with
respect to rising and falling edges of RCLK. In order to ensure correct
operation of read data transfers in HS400 mode, the incoming RX data
needs to be sampled by delayed version of RCLK.

The CDCLP533 delay circuit shifts the RCLK by T/4. It needs to be
initialized, configured and enabled once during HS400 mode switch and
when operational voltage/clock is changed.

Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>
mmc: core: Disable HPI for certain Hynix eMMC cards

Certain Hynix eMMC 4.41 cards might get broken when HPI feature is used
and hence this patch disables the HPI feature for such buggy cards.

As some of the other features like BKOPs/Cache/Sanitize are dependent on
HPI feature, those features would also get disabled if HPI is disabled.

Change-Id: I6a638ce089cbd977122e47aecb721bc3f0adf7b0
Signed-off-by: Pratibhasagar V <pratibha@codeaurora.org>
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
mmc: core: Do not print error message if runtime-error is not set.

This patch checks the state of the device when schedule_suspend
fails and prints the error iff pm_runtime_error or pm_runtime is
disabled.

CRs-Fixed: 529879
Change-Id: I5800bc64cdcf5859260a7f24b9773355bef2f750
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
mmc: core: add clock-scaling support to HS400 cards

This patch adds clock scaling support to HS400 cards.
Scaling down to 52MHz from HS400 involves:
 - switching the bus-speed mode to HS at 52MHz

Scaling up to HS400 would require all of the initialization
process upto HS400 mode selection.

Change-Id: I8196d6666bcc0ef327659253df53a17792fa51f7
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
Signed-off-by: Krishna Konda <kkonda@codeaurora.org>
mmc: cd-gpio: Add sanity checks in mmc_cd_gpio_free()

Add necessary sanity checks in mmc_cd_gpio_free() to fix
below warning:

[    5.856209] WARNING: at
local/mnt/workspace/builds/jb2/kernel/kernel/irq/manage.c:1219
__free_irq+0x88/0x1a8()
[    5.856215] Trying to free already-free IRQ 0
[    5.856219] Modules linked in:
[    5.856239] [<c010be94>] (unwind_backtrace+0x0/0x11c) from [<c0190f38>]
(warn_slowpath_common+0x4c/0x64)

CRs-fixed: 564084
Change-Id: Ia9ea0e82453e645ce44046a762cd78aeb544e8b1
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>
mmc: core: disable runtime-pm if MMC_CAP2_CORE_RUNTIME_PM is not defined

There is currently no mechanism to disable the runtime-pm
of eMMC/SD card. This patch adds the mechanism to disable
runtime-pm of eMMC/SD if MMC_CAP2_CORE_RUNTIME_PM is not
defined.

It sets the platform, class and card device as RPM_ACTIVE
irrespective of the capability but doesn't enable it.
The card is never runtime-suspended and hence the
corresponding mmc_host and platform device are not
runtime-suspended as well.

A capability MMC_CAP2_CORE_PM is used to select the use
of core power-management framework.

CRs-Fixed: 490021
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
Change-Id: I394a81a889ab7d4f0f0e6fe4b932630e30fc16c9
mmc: sdhci-msm: enable stop transmission support

This change enables handling of urgent data transfer request by setting
MMC_CAP2_STOP_REQUEST bit of caps2 field.

In order to decrease a latency of a prioritized requests (aka Urgent
request), we might want to stop the transmission of a running "low
priority" request in order to handle the Urgent request. The urgency of
the request is decided by the block layer I/O scheduler. When the block
layer notifies the MMC layer of an urgent request and if the MMC layer is
blocked on current request to complete, it will be woken up, current
request will be stopped, any outstanding requests are reinserted back to
the block layer and urgent request execution started.

Change-Id: I542da0b2230dd8c884902f3b14c13b0744aedaa1
Signed-off-by: Konstantin Dorfman <kdorfman@codeaurora.org>
mmc: sdhci-msm: enable asynchronous interrupt support in 4-bit mode

SDIO 3.0 specification has added the support for asynchronous interrupt
period during which card allows the clock to be gated off.

As SDCC driver is capable of handling the asynchronous interrupt,
advertise MMC_CAP2_ASYNC_SDIO_IRQ_4BIT_MODE capability.

Change-Id: Id5a86bc70b7b798b23be3a0fc0d59b2db05e0409
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
mmc: sdhci-msm: add MMC_PM_KEEP_POWER flag

This flag ensures that the power to the sdio card is not
cut-off. That way this can wake-up the device when required
using asynchronous interrupt mechanism.

Change-Id: Ic91bfdc93e117c5e627360a4d0ef80f661aa1b60
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
mmc: sdhci-msm: add USE_CORE_PM capability

Defining this capability would invoke the suspend/resume
routines defined for mmc_host device by the PM framework.

CRs-Fixed: 490021
Change-Id: I6fde407ed91f0a7249923bb156482378e2bb727c
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
mmc: sdhci: Turn on controller clocks and card power at MMC_POWER_UP

Currently, the clock to the card is enabled prior to enabling
the power to card. Specification requires that the power be
supplied first and then a delay of 10ms and then clock be
provided to the card.

In this, during MMC_POWER_UP mode, the controller clocks would be
ON and the power would be supplied to the card. In the MMC_POWER_ON
mode, the clocks to the card would be enabled and the rate set.
A callback has been provided to facilitate the enabling of
controller clocks.

CRs-Fixed: 567658
Change-Id: I2d66eae1581b9b136faaba4cafc330aeb6a3f364
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>
mmc: sdhci-msm: enable controller clocks at MMC_POWER_UP

A callback to turn-on the controller clocks is implemented.
This callback would ensure that the pclk and mclk are enabled
but the output clock to the card is disabled.

CRs-Fixed: 567658
Change-Id: Ic97e600a6388fb64f1267a097b201f31d114a1fb
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>
mmc: core: fix buffer overflow during memcpy of ext_csd

Fix buffer overflow while caching the mmc ext_csd content.
Also, to avoid duplicate allocation keep the allocated ext_csd
till the card is removed.

CRs-Fixed: 583929
Change-Id: I5d69e37f6fd1f5249479d454c353be050df40b6d
Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>
mmc: host: Use sentinels for devicetree match tables

Use sentinels as the path terminator for device match table
in drivers msm_sdcc.c and sdhci-msm.c. Without this, of_dev_lookup()
may run off the end of the array looking for bogus data.

CRs-Fixed: 582113
Change-Id: I069d3e058cea9f1bf74d48e7f7e83465ca981017
Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>
mmc: core : fix arbitrary read/write to user space

In the MMC card debug_fs the read and write handlers use the strlcat
and sscanf, without checking the pointer given.
Since the pointer is not checked it is possible to write
everywhere (ring 0 or 3).
In order to fix it, an access_ok function is being used to verify
the buffer's pointer supplied by user is valid.

CRs-fixed: 545716
Change-Id: Ia710b6af5a95974fc930ca902e8ff18afa4e17ba
Signed-off-by: Raviv Shvili <rshvili@codeaurora.org>