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Douglas Anderson 2086f801cb mmc: core: Add mmc_regulator_set_vqmmc() 
This adds logic to the MMC core to set VQMMC.  This is expected to be
called by MMC drivers like dw_mmc as part of (or instead of) their
start_signal_voltage_switch() callback.

A few notes:

* When setting the signal voltage to 3.3V we do our best to make VQMMC
  and VMMC match.  It's been reported that this makes some old cards
  happy since they were tested back in the day before UHS when VQMMC
  and VMMC were provided by the same regulator.  A nice side effect of
  this is that we don't end up on the hairy edge of VQMMC (2.7V),
  which some EEs claim is a little too close to the minimum for
  comfort.
  This is done in two steps. At first we try to find a VQMMC within
  a 0.3V tolerance of VMMC and if this is not supported by the
  supplying regulator we try to find a suitable voltage within the
  whole 2.7V-3.6V area of the spec.

* The two step approach is currently necessary, as the used
  regulator_set_voltage_triplet(min, target, max) uses a simple
  implementation that just tries two basic steps:
	regulator_set_voltage(target, max);
	regulator_set_voltage(min, target);
  So with only one step with 2.7-3.6V borders, if a suitable voltage
  is a bit below VMMC, we would directly get the lowest 2.7V
  which some boards (like Rockchips) don't like at all.

* When setting the signal voltage to 1.8V or 1.2V we aim for that
  specific voltage instead of picking the lowest one in the range.

* We very purposely don't print errors in mmc_regulator_set_vqmmc().
  There are cases where the MMC core will try several different
  voltages and we don't want to pollute the logs.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
 		2015-10-26 16:00:10 +01:00
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accessibility
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acpi ACPICA: Tables: Fix FADT dependency regression 2015-10-14 22:48:13 +02:00
amba
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android mm: mark most vm_operations_struct const 2015-09-10 13:29:01 -07:00
ata Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2015-09-03 16:55:55 -07:00
atm solos-pci: Increase headroom on received packets 2015-09-17 21:29:07 -07:00
auxdisplay
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base mm: cma: fix incorrect type conversion for size during dma allocation 2015-10-23 17:55:10 +09:00
bcma
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block Merge branch 'for-linus' of git://git.kernel.dk/linux-block 2015-10-24 07:20:57 +09:00
bluetooth Bluetooth: hci_bcm: Fix crash on suspend 2015-08-28 21:09:14 +02:00
bus bus: arm-ccn: Fix irq affinity setting on CPU migration 2015-10-15 17:10:15 +02:00
cdrom
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char Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2015-09-26 21:05:23 -04:00
clk clk: rockchip: Make calculations use rounding 2015-10-26 16:00:07 +01:00
clocksource clocksource/drivers/keystone: Fix bad NO_IRQ usage 2015-09-29 14:33:51 +02:00
connector
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cpufreq cpufreq: intel_pstate: Fix divide by zero on Knights Landing (KNL) 2015-10-15 22:46:33 +02:00
cpuidle Additional power management and ACPI material for v4.3-rc1 2015-09-11 19:11:06 -07:00
crypto Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2015-09-26 21:05:23 -04:00
dca
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devfreq PM / devfreq: fix double kfree 2015-10-02 11:05:58 +09:00
dio
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dma dmaengine fixes for 4.3-rc4 2015-10-02 14:46:15 -04:00
dma-buf
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edac edac updates for v4.3-rc1 2015-09-11 16:21:12 -07:00
eisa
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extcon extcon: Fix attached value returned by is_extcon_changed 2015-09-21 15:07:19 +09:00
firewire
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firmware arm64/efi: Fix boot crash by not padding between EFI_MEMORY_RUNTIME regions 2015-10-01 12:51:28 +02:00
fmc
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gpio Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-09-18 08:11:42 -07:00
gpu Merge branch 'drm-fixes-4.3' of git://people.freedesktop.org/~agd5f/linux into drm-fixes 2015-10-22 10:24:55 +10:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2015-09-04 12:02:11 -07:00
hsi mm: mark most vm_operations_struct const 2015-09-10 13:29:01 -07:00
hv Drivers: hv: vmbus: fix init_vp_index() for reloading hv_netvsc 2015-09-20 22:44:51 -07:00
hwmon hwmon: (pwm-fan) Fix module autoload for OF platform driver 2015-09-20 17:50:19 -07:00
hwspinlock
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hwtracing/coresight
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i2c i2c: designware: Do not use parameters from ACPI on Dell Inspiron 7348 2015-10-18 14:11:08 +02:00
ide
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idle intel_idle: Skylake Client Support - updated 2015-09-10 14:03:44 -04:00
iio iio: st_accel: fix interrupt handling on LIS3LV02 2015-10-03 10:27:18 +01:00
infiniband Changes for 4.3-rc6 2015-10-24 07:28:05 +09:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2015-10-16 17:39:27 -07:00
iommu Merge tag 'for-linus-20151021' of git://git.infradead.org/intel-iommu 2015-10-22 06:32:48 +09:00
ipack
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irqchip Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-10-04 11:40:09 +01:00
isdn libnvdimm for 4.3: 2015-09-08 14:35:59 -07:00
leds leds:lp55xx: Correct Kconfig dependency for f/w user helper 2015-09-17 10:02:20 +02:00
lguest
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macintosh powerpc updates for 4.3 2015-09-03 16:41:38 -07:00
mailbox Merge branch 'mailbox-for-next' of git://git.linaro.org/landing-teams/working/fujitsu/integration 2015-09-05 18:11:04 -07:00
mcb mcb: Fix error handling in mcb_pci_probe() 2015-10-05 05:10:01 +01:00
md dm cache: the CLEAN_SHUTDOWN flag was not being set 2015-10-23 14:02:56 -04:00
media [media] m88ds3103: use own reg update_bits() implementation 2015-10-22 15:48:28 -02:00
memory memory: omap-gpmc: dump "before" state before first modification 2015-10-12 16:23:34 -07:00
memstick
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message mptfusion: prevent some memory corruption 2015-08-26 07:11:45 -07:00
mfd mfd: max77843: Fix max77843_chg_init() return on error 2015-10-01 16:31:42 +01:00
misc powerpc fixes for 4.3 #3 2015-10-16 12:07:43 -07:00
mmc mmc: core: Add mmc_regulator_set_vqmmc() 2015-10-26 16:00:10 +01:00
mtd A few MTD fixes: 2015-10-07 09:35:15 +01:00
net net: bcmgenet: Fix early link interrupt enabling 2015-10-18 23:07:12 -07:00
nfc This is the bulk of GPIO changes for the v4.3 kernel cycle: 2015-09-04 10:07:45 -07:00
ntb NTB: Fix range check on memory window index 2015-09-07 15:27:12 -04:00
nubus
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nvdimm pmem: add proper fencing to pmem_rw_page() 2015-09-17 11:49:28 -04:00
nvmem nvmem: sunxi: Check for memory allocation failure 2015-10-04 12:09:43 +01:00
of Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-09-26 06:01:33 -04:00
oprofile
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parisc PCI: Revert "PCI: Call pci_read_bridge_bases() from core instead of arch code" 2015-09-15 13:18:04 -05:00
parport
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pci genirq/msi: Do not use pci_msi_[un]mask_irq as default methods 2015-10-16 12:40:43 +02:00
pcmcia pcmcia: soc_common: remove skt_dev_info's clk pointer 2015-09-03 16:01:03 +01:00
perf drivers/perf: arm_pmu: avoid CPU device_node reference leak 2015-10-15 17:11:23 +02:00
phy phy: berlin-sata: Fix module autoload for OF platform driver 2015-09-25 17:01:14 +05:30
pinctrl pinctrl: uniphier: fix input enable settings for PH1-sLD8 2015-10-02 04:06:26 -07:00
platform platform-drivers-x86 for 4.3-2 2015-09-17 21:41:02 -07:00
pnp
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power power supply and reset fixes for the v4.3 series 2015-09-17 12:25:42 -07:00
powercap powercap / RAPL: disable the 2nd power limit properly 2015-08-29 01:46:40 +02:00
pps
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ps3
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ptp
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pwm pwm: Changes for v4.3-rc1 2015-09-09 10:55:32 -07:00
rapidio
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ras
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regulator Merge remote-tracking branch 'regulator/fix/axp20x' into regulator-linus 2015-10-06 12:00:42 +01:00
remoteproc
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reset reset: ath79: Fix missing spin_lock_init 2015-09-01 14:48:40 +02:00
rpmsg
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rtc rtc: abx80x: fix RTC write bit 2015-09-05 19:37:31 +02:00
s390 virtio: fixes on top of 4.3-rc1 2015-09-18 09:28:20 -07:00
sbus
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scsi SCSI fixes on 20151010 2015-10-11 10:02:30 -07:00
sfi
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sh SH Drivers Updates for v4.3 2015-09-21 12:02:27 -07:00
sn
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soc genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
spi Merge remote-tracking branches 'spi/fix/davinci' and 'spi/fix/sh-msiof' into spi-linus 2015-10-07 11:43:39 +01:00
spmi genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
ssb
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staging staging driver fixes for 4.3-rc7 2015-10-24 07:51:13 +09:00
target iscsi-target: Avoid OFMarker + IFMarker negotiation 2015-09-24 23:24:46 -07:00
tc
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thermal Samsung 2nd fixes for v4.3 2015-10-21 17:02:13 +02:00
thunderbolt thunderbolt: Allow loading of module on recent Apple MacBooks with thunderbolt 2 controller 2015-09-20 15:20:11 -07:00
tty Revert "serial: 8250_dma: don't bother DMA with small transfers" 2015-10-17 21:24:46 -07:00
uio
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usb xhci: Add spurious wakeup quirk for LynxPoint-LP controllers 2015-10-17 00:04:18 -07:00
uwb
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vfio
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vhost virtio: fixes on top of 4.3-rc1 2015-09-18 09:28:20 -07:00
video fbcon: initialize blink interval before calling fb_set_par 2015-10-17 22:00:39 -07:00
virt
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virtio virtio_balloon: do not change memory amount visible via /proc/meminfo 2015-09-08 13:32:11 +03:00
vlynq
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vme
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w1 Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2015-09-01 18:46:42 -07:00
watchdog watchdog: iTCO: Fix dependencies on I2C 2015-09-28 10:56:10 +02:00
xen Merge branch 'akpm' (patches from Andrew) 2015-09-10 18:19:42 -07:00
zorro
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Kconfig Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm 2015-09-03 16:27:01 -07:00
Makefile This is the bulk of pin control changes for the v4.3 development 2015-09-04 10:22:09 -07:00