mfd: palmas: support IRQ inversion at the board level

Some boards or SoCs have an inverter between the PMIC IRQ output pin and
the IRQ controller input signal.

The IRQ specifier in DT is meant to represent the IRQ flags at the input
to the IRQ controller.

The Palmas HW's IRQ output has configurable polarity. The driver
currently selects the output polarity by querying the input polarity at
the IRQ controller. This works fine if the IRQ signal is routed directly
from the PMIC to the IRQ controller with no intervening logic. However,
if the signal is inverted between the two, this automatic polarity
selection gets the wrong answer.

Add an additional optional DT and platform data parameter which indicates
that such an inversion occurs. If this option is enabled, the Palmas
driver will configure its IRQ output to the opposite polarity of the IRQ
controller's input.

An alternative would have been to add a new non-optional DT parameter to
indicate the exact desired output polarity. However, this would have been
an incompatible change to the DT binding.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
---
If this patch could be applied to its own branch (w/ signed tag) in the
MFD tree, that would great; then I can pull patch 1/2 into the Tegra tree
so that I can apply patch 2/2 to the Tegra tree. Thanks.
ARM: tegra: fix Dalmore PMIC IRQ polarity

The Tegra PMC's resume-from-sleep logic wants an active-low IRQ input
from the PMIC. However, the PMIC IRQ is also routed to the GIC, which
only supports active high IRQs (or rising edge). Hence, the signal must
be inverted in the PMC before being routed to the GIC. This implies that
the PMC DT property nvidia,invert-interrupt must be set, and it is.

The PMIC's DT interrupts property must represent the IRQ level at the
GIC, since that is the PMIC's parent IRQ controller. Fix the PMIC's
interrupts property to correctly describe the GIC input polarity.

However, the PMIC IRQ output's polarity is programmable in HW, and by
default follows the parent IRQ controller's input polarity. We need to
have an active-low output due to the inversion inside the Tegra PMC.
Hence, add the ti,irq-externally-inverted property to the PMIC.

Reported-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
ASoC: dmaengine: remove SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME

struct snd_dmaengine_pcm_config's new chan_names field implements the
same feature, and nothing uses SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME,
so remove it.

FIXME: Need to create a patch to ASoC's topic/samsung(?) branch to stop
it from using SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME first...

Signed-off-by: Stephen Warren <swarren@nvidia.com>
ARM: tegra: fix RTC0 alias for Cardhu

This alias entry was evidently cut/paste from a different board, and
not correctly updated to match Cardhu. Fix this.

Fixes: 553c0a200e20 ("ARM: tegra: set up /aliases entries for RTCs")
Signed-off-by: Stephen Warren <swarren@nvidia.com>
ASoC: dmaengine: remove compat_request_channel

struct snd_dmaengine_pcm_config's compat_request_channel field is no
longer set anywhere. Remove it, and the code that implements it.

FIXME: Need to wait for ux500 driver not to be using this feature.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
LOCAL HACK: tegra_defconfig changes

Signed-off-by: Stephen Warren <swarren@nvidia.com>
ARM: tegra: bluetooth testing hacks for Cardhu

Signed-off-by: Stephen Warren <swarren@nvidia.com>
HACK: Attempt to get DMICs working
Revert "HACK: Attempt to get DMICs working"

This reverts commit 7696d3e61c2dd5ce3f480083dc506be340062a9b.
ARM: tegra: remove tegra EMC scaling driver

Nothing calls into the Tegra EMC (External Memory Controller) scaling
driver any more, so it's dead code. Remove it.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
ASoC: wm8903: disable IRQs during BIAS_OFF

If the WM8903 IRQ is triggered after the device is suspended, or before
it is resumed, the underlying I2C bus that the WM8903 is attached to may
not be available. This may cause the IRQ handler to emit the following
error:

    wm8903 0-001a: Failed to read IRQ status: -16

... or perhaps even cause a failure inside the I2C driver.

To prevent this, explicitly mask all interrupt sources when entering
BIAS_OFF. Also, modify the IRQ handler to immediately return if the
device is in BIAS_OFF, so that shared interrupt lines don't cause a
similar problem. This requires that WM8903 interrupts be disabled to
avoid interrupt storms.

During resume (actually, the transition back to BIAS_STANDBY), restore
the desired IRQ mask.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Revert "ASoC: wm8903: disable IRQs during BIAS_OFF"

This reverts commit 294680591cf91d99c1af375c055d39813338a04c.
mmc: core: don't return 1 for max_discard

In mmc_do_calc_max_discard(), if only a single erase block can be
discarded within the host controller's timeout, don't allow discard
operations at all.

Previously, the code allowed sector-at-a-time discard (rather than
erase-block-at-a-time), which was chronically slow.

Without this patch, on the NVIDIA Tegra Cardhu board, the loops result
in qty == 1, which is immediately returned. This causes discard to
operate a single sector at a time, which is chronically slow. With this
patch in place, discard operates a single erase block at a time, which
is reasonably fast.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Dong Aisheng <dongas86@gmail.com>
Cc: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Vladimir Zapolskiy <vz@mleia.com>
Fixes: e056a1b5b67b "(mmc: queue: let host controllers specify maximum discard timeout")
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Revert "mmc: core: don't return 1 for max_discard"

This reverts commit afb1238d1a4be99749c37bbb48a437034e05e5f8.
Revert "mmc: queue: let host controllers specify maximum discard timeout"

This reverts commit e056a1b5b67b4e4bfad00bf143ab14f634777705.

Conflicts:
	drivers/mmc/card/queue.c
mmc: core: use timeout for erase operation not erase cmd submission

FIXME:

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Revert "mmc: core: use timeout for erase operation not erase cmd submission"

This reverts commit 65e68f8a2bb596a179ae90c32f32ee028456bd9a.
Revert "Revert "mmc: queue: let host controllers specify maximum discard timeout""

This reverts commit 99ea1bfac40e4767dffc2a48eb603400d4732779.
HACK: attempt to convert sound/soc/samsung for ASoC DMA changes
Revert "HACK: attempt to convert sound/soc/samsung for ASoC DMA changes"

This reverts commit e072db5ec5c3f957196e602cd414e1518ee8a966.