Jisheng Zhang
9115df89d1
clocksource/drivers/dw_apb_timer_of: Implement ARM delay timer ...
Implement an ARM delay timer to be used for udelay(). This allows us to
skip the delay loop calibration at boot on Marvell BG2, BG2Q, BG2CD
platforms. And after this patch, udelay() will be unaffected by CPU
frequency changes.
Note: Although in case there are several possible delay timers, we may
not select the "best" delay timer. Take one Marvell Berlin platform for
example: we have arch timer and dw-apb timer. The arch timer freq is
25MHZ while the dw-apb timer freq is 100MHZ, current selection would
choose the dw-apb timer. But the dw apb timer is on the APB bus while
arch timer sits in CPU, the cost of accessing the apb timer is higher
than the arch timer. We could introduce "rating" concept to delay
timer, but this approach "brings a lot of complexity and workarounds
in the code for a small benefit" as pointed out by Daniel.
Later, Arnd pointed out "However, we could argue that this actually
doesn't matter at all, because the entire point of the ndelay()/
udelay()/mdelay() functions is to waste CPU cycles doing not much at
all, so we can just as well waste them reading the timer register
than spinning on the CPU reading the arch timer more often.", so we
just simply register the dw apb base delay timer.
Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2015-12-15 09:42:00 +01:00
Merge branches 'acpi-smbus', 'acpi-ec' and 'acpi-pci'
2015-11-20 01:22:52 +01:00
SCSI misc on 20151113
2015-11-13 20:35:54 -08:00
Merge branch 'pm-sleep'
2015-11-20 01:22:33 +01:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client
2015-11-13 09:24:40 -08:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2015-11-10 18:11:41 -08:00
ARM: SoC driver updates for v4.4
2015-11-10 15:00:03 -08:00
ipmi watchdog : add panic_wdt_timeout parameter
2015-11-16 06:28:43 -06:00
h8300 update for v4.4
2015-11-12 15:26:39 -08:00
clocksource/drivers/dw_apb_timer_of: Implement ARM delay timer
2015-12-15 09:42:00 +01:00
mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd
2015-11-06 17:50:42 -08:00
Merge branches 'pm-cpufreq' and 'acpi-cppc'
2015-11-20 01:22:10 +01:00
Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
2015-11-17 09:40:05 -08:00
dmaengine: at_hdmac: use %pad format string for dma_addr_t
2015-11-16 09:21:05 +05:30
dma-buf/fence: add fence_wait_any_timeout function v2
2015-10-30 01:16:16 -04:00
asm-generic cleanups
2015-11-06 14:22:15 -08:00
IEEE 1394 subsystem patch:
2015-11-11 10:21:34 -08:00
ARM: SoC driver updates for v4.4
2015-11-10 15:00:03 -08:00
fpga: socfpga: Fix check of return value of devm_request_irq
2015-10-29 15:20:25 -07:00
asm-generic cleanups
2015-11-06 14:22:15 -08:00
Merge tag 'drm-intel-fixes-2015-11-19' of git://anongit.freedesktop.org/drm-intel into drm-fixes
2015-11-20 09:45:31 +10:00
HID: wacom: fixup quirks setup for WACOM_DEVICETYPE_PAD
2015-11-17 00:24:14 +01:00
hsi: controllers:remove redundant code
2015-10-30 16:10:40 +01:00
drivers/hv: share Hyper-V SynIC constants with userspace
2015-11-04 16:24:33 +01:00
hwmon: (scpi) skip unsupported sensors properly
2015-11-16 09:59:50 -08:00
Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending
2015-11-13 20:04:17 -08:00
i2c: i801: add Intel Lewisburg device IDs
2015-11-20 16:22:21 +01:00
mm, page_alloc: rename __GFP_WAIT to __GFP_RECLAIM
2015-11-06 17:50:42 -08:00
First set of IIO fixes for the 4.4 cycle.
2015-11-18 13:15:50 -08:00
SCSI misc on 20151113
2015-11-13 20:35:54 -08:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
2015-11-13 21:41:14 -08:00
s390/pci_dma: handle dma table failures
2015-11-09 09:10:49 +01:00
irqchip/gic: Add save/restore of the active state
2015-11-17 14:25:59 +01:00
TTY/Serial driver patches for 4.4-rc1
2015-11-04 21:35:12 -08:00
spi: Updates for v4.4
2015-11-05 13:15:12 -08:00
block: change ->make_request_fn() and users to return a queue cookie
2015-11-07 10:40:46 -07:00
mailbox: mailbox-test: avoid reading iomem twice
2015-11-04 14:03:04 +05:30
Merge branch 'for-4.4/io-poll' of git://git.kernel.dk/linux-block
2015-11-10 17:23:49 -08:00
various: fix pci_set_dma_mask return value checking
2015-11-20 16:17:32 -08:00
ARM: SoC driver updates for v4.4
2015-11-10 15:00:03 -08:00
SCSI queue for 4.4.
2015-11-12 07:06:18 -05:00
asm-generic cleanups
2015-11-06 14:22:15 -08:00
Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending
2015-11-13 20:04:17 -08:00
mmc: remove bondage between REQ_META and reliable write
2015-11-09 14:04:52 +01:00
mtd: nand: fix shutdown/reboot for multi-chip systems
2015-11-16 10:51:39 -08:00
various: fix pci_set_dma_mask return value checking
2015-11-20 16:17:32 -08:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2015-11-10 18:11:41 -08:00
NTB: fix 32-bit compiler warning
2015-11-08 16:24:43 -05:00
libnvdimm, pmem: fix size trim in pmem_direct_access()
2015-11-12 09:55:23 -08:00
NVMe: add support for Apple NVMe controller
2015-11-11 09:36:57 -07:00
More power management and ACPI updates for v4.4-rc1
2015-11-12 11:50:33 -08:00
pci: remove pci_dma_supported
2015-11-10 16:32:11 -08:00
Merge branches 'acpi-smbus', 'acpi-ec' and 'acpi-pci'
2015-11-20 01:22:52 +01:00
arm64 updates for 4.4:
2015-11-04 14:47:13 -08:00
phy: qcom-ufs: fix build error when the component is built as a module
2015-11-09 17:44:24 -05:00
This is the bulk of GPIO changes for v4.4:
2015-11-02 12:59:12 -08:00
platform/chrome: Branch for v4.4
2015-11-13 21:53:18 -08:00
- New Device Support
2015-11-06 10:23:50 -08:00
pwm: Changes for v4.4-rc1
2015-11-11 09:16:10 -08:00
spi: Updates for v4.4
2015-11-05 13:15:12 -08:00
RTC for 4.4
2015-11-10 10:01:21 -08:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
2015-11-18 08:59:29 -08:00
SCSI misc on 20151113
2015-11-13 20:35:54 -08:00
drivers: sh: Get rid of CONFIG_ARCH_SHMOBILE_MULTI
2015-11-17 02:12:46 +09:00
ARM: SoC driver updates for v4.4
2015-11-10 15:00:03 -08:00
Merge remote-tracking branches 'spi/topic/s3c64xx', 'spi/topic/ti-qspi' and 'spi/topic/txx9' into spi-next
2015-11-04 11:02:16 +00:00
char/misc drivers for 4.4-rc1
2015-11-04 22:15:15 -08:00
Revert "Staging: wilc1000: coreconfigurator: Drop unneeded wrapper functions"
2015-11-18 13:22:44 -08:00
SCSI misc on 20151113
2015-11-13 20:35:54 -08:00
thermal: rockchip: fix compile error
2015-11-11 19:52:39 -08:00
serial: export fsl8250_handle_irq
2015-11-20 16:19:54 -08:00
usblp: do not set TASK_INTERRUPTIBLE before lock
2015-11-19 16:31:42 -08:00
driver core update for 4.4-rc1
2015-11-04 21:50:37 -08:00
VFIO updates for v4.4-rc1
2015-11-13 17:05:32 -08:00
Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending
2015-11-13 20:04:17 -08:00
fbdev changes for 4.4
2015-11-10 10:00:09 -08:00
char/misc drivers for 4.4-rc1
2015-11-04 22:15:15 -08:00
power supply and reset changes for the v4.4 series
2015-11-05 12:28:15 -08:00
Merge git://www.linux-watchdog.org/linux-watchdog
2015-11-10 10:11:12 -08:00
Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending
2015-11-13 20:04:17 -08:00
char/misc drivers for 4.4-rc1
2015-11-04 22:15:15 -08:00
char/misc drivers for 4.4-rc1
2015-11-04 22:15:15 -08:00
9115df89d1