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18a4208826
linux/drivers
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Peter Senna Tschudin 18a4208826 imx-serial: Reduce RX DMA startup latency when opening for reading 
Reduce RX DMA start latency for the first reception when port is opened
for reading. Instead of waiting for an interrupt signaling data on RX
FIFO or data too old on RX FIFO, start RX DMA immediately when the
serial port is opened for reading.

Before this patch, the average RX DMA latency for the first reception
was 42489 microseconds with a standard deviation of 25721 microseconds
in 36 samples.

After the patch the average RX DMA latency for the first reception, when
the serial port is opened for reading, is 653 microseconds with a
standard deviation of 294 microseconds in 36 samples.

Signed-off-by: Peter Senna Tschudin <peter.senna@collabora.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-04-11 21:36:43 +02:00
..
accessibility
acpi Merge branches 'acpi-hotplug-fixes', 'acpi-build-fixes' and 'acpi-apei-fixes' 2017-03-31 22:50:14 +02:00
amba
android sched/headers: Prepare for new header dependencies before moving code to <linux/sched/signal.h> 2017-03-02 08:42:29 +01:00
ata ahci: qoriq: correct the sata ecc setting error 2017-03-09 11:55:23 -05:00
atm sched/headers: Prepare to move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h> 2017-03-02 08:42:32 +01:00
auxdisplay auxdisplay: img-ascii-lcd: add missing sentinel entry in img_ascii_lcd_matches 2017-03-16 16:59:55 +09:00
base drivers core: remove assert_held_device_hotplug() 2017-03-16 16:56:19 -07:00
bcma
block nbd: replace kill_bdev() with __invalidate_device() 2017-03-24 15:42:47 -06:00
bluetooth Bluetooth: btqcomsmd: fix compile-test dependency 2017-03-22 19:22:04 -07:00
bus ARM: SoC driver updates 2017-02-23 15:57:04 -08:00
cdrom Merge branch 'for-4.11/next' into for-4.11/linus-merge 2017-02-17 14:08:19 -07:00
char Char/Misc driver fixes for 4.11-rc4 2017-03-26 11:15:54 -07:00
clk Allwinner clock fixes for 4.11 2017-03-23 16:08:46 -07:00
clocksource Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-04-02 09:22:03 -07:00
connector
cpufreq Merge branches 'pm-cpufreq-fixes' and 'pm-cpuidle-fixes' 2017-03-31 23:00:53 +02:00
cpuidle cpuidle: powernv: Pass correct drv->cpumask for registration 2017-03-29 22:55:36 +02:00
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2017-03-31 12:11:32 -07:00
dax device-dax: fix debug output typo 2017-03-10 19:56:56 -08:00
dca
devfreq scripts/spelling.txt: add "followings" pattern and fix typo instances 2017-02-27 18:43:47 -08:00
dio
dma dmaengine: Fix array index out of bounds warning in __get_unmap_pool() 2017-03-14 10:11:27 +05:30
dma-buf sched/headers: Prepare to move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h> 2017-03-02 08:42:32 +01:00
edac EDAC, pnd2_edac: Fix reported DIMM number 2017-03-26 09:36:28 +02:00
eisa
extcon extcon: int3496: Set the id pin to direction-input if necessary 2017-03-22 18:29:48 +09:00
firewire Merge branch 'idr-4.11' of git://git.infradead.org/users/willy/linux-dax 2017-02-28 20:29:41 -08:00
firmware efi/esrt: Cleanup bad memory map log messages 2017-03-17 18:53:12 +00:00
fmc
fpga fpga zynq: Use the scatterlist interface 2017-02-10 15:20:44 +01:00
fsi drivers/fsi: add driver to device matches 2017-02-10 15:19:48 +01:00
gpio gpio:mcp23s08 Fixed missing interrupts 2017-03-17 09:20:28 +01:00
gpu Merge tag 'drm-misc-fixes-2017-03-31' of git://anongit.freedesktop.org/git/drm-misc into drm-fixes 2017-03-31 17:29:26 +10:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid 2017-03-31 11:50:31 -07:00
hsi sched/headers: Prepare to move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h> 2017-03-02 08:42:32 +01:00
hv Drivers: hv: vmbus: Don't leak memory when a channel is rescinded 2017-03-16 16:42:33 +09:00
hwmon hwmon: (asus_atk0110) fix uninitialized data access 2017-03-23 12:01:57 -07:00
hwspinlock
hwtracing intel_th: pci: Add Gemini Lake support 2017-03-15 14:55:18 +02:00
i2c i2c: mux: pca954x: Add missing pca9546 definition to chip_desc 2017-03-24 12:22:18 +01:00
ide sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
idle Power management turbostat utility updates for v4.11-rc1 2017-03-02 17:41:27 -08:00
iio iio: imu: st_lsm6dsx: fix FIFO_CTRL2 overwrite during watermark configuration 2017-03-19 10:44:42 +00:00
infiniband IB/qib: fix false-postive maybe-uninitialized warning 2017-03-24 22:44:29 -04:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2017-03-23 19:51:06 -07:00
iommu Merge branch 'for-joerg/arm-smmu/fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux into iommu/fixes 2017-03-22 23:59:56 +01:00
ipack
irqchip irqchip fixes for 4.11-rc5 2017-03-31 16:54:48 +02:00
isdn Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-03-14 21:31:23 -07:00
leds sched/headers: Prepare for new header dependencies before moving code to <linux/sched/loadavg.h> 2017-03-02 08:42:27 +01:00
lguest sched/headers: Prepare to move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h> 2017-03-02 08:42:32 +01:00
lightnvm lightnvm: set default lun range when no luns are specified 2017-02-15 08:27:21 -07:00
macintosh powerpc/pmac: Fix crash in dma-mapping.h with NULL dma_ops 2017-03-10 14:17:23 +11:00
mailbox sched/headers: Prepare to move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h> 2017-03-02 08:42:32 +01:00
mcb
md Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md 2017-03-16 11:43:48 -07:00
media media fixes for v4.11-rc4 2017-03-24 13:34:16 -07:00
memory Linux 4.11-rc1 2017-03-06 08:37:53 -08:00
memstick Merge branch 'for-4.11/next' into for-4.11/linus-merge 2017-02-17 14:08:19 -07:00
message SCSI misc on 20170220 2017-02-21 11:51:42 -08:00
mfd staging/iio driver patches for 4.11-rc1 2017-02-22 12:14:01 -08:00
misc Char/Misc driver fixes for 4.11-rc4 2017-03-26 11:15:54 -07:00
mmc mmc: sdhci-of-at91: fix MMC_DDR_52 timing selection 2017-03-30 21:10:29 +02:00
mtd scripts/spelling.txt: add "disble(d)" pattern and fix typo instances 2017-03-09 17:01:09 -08:00
net net:ethernet:aquantia: Fix for RX checksum offload. 2017-03-22 19:40:52 -07:00
nfc scripts/spelling.txt: add "omited" pattern and fix typo instances 2017-02-27 18:43:47 -08:00
ntb ntb: ntb_hw_intel: link_poll isn't clearing the pending status properly 2017-02-16 23:11:26 -05:00
nubus
nvdimm nfit, libnvdimm: fix interleave set cookie calculation 2017-03-01 00:49:42 -08:00
nvme nvme-loop: handle cpu unplug when re-establishing the controller 2017-03-21 18:38:46 +02:00
nvmem
of DeviceTree updates for 4.11: 2017-02-22 19:23:14 -08:00
oprofile sched/headers: Prepare to move the get_task_struct()/put_task_struct() and related APIs from <linux/sched.h> to <linux/sched/task.h> 2017-03-02 08:42:40 +01:00
parisc Merge branch 'parisc-4.11-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux 2017-03-03 16:20:06 -08:00
parport parport: fix attempt to write duplicate procfiles 2017-03-16 17:32:21 +09:00
pci PCI: thunder-pem: Add legacy firmware support for Cavium ThunderX host controller 2017-03-23 17:11:26 -05:00
pcmcia
perf sched/headers: Prepare for new header dependencies before moving code to <linux/sched/clock.h> 2017-03-02 08:42:27 +01:00
phy phy: qcom-usb-hs: Add depends on EXTCON 2017-03-09 15:29:57 +05:30
pinctrl pinctrl: qcom: ipq4019: add missing pingroups for pins > 70 2017-03-23 10:13:15 +01:00
platform platform-drivers-x86 for v4.11-2 2017-03-13 13:23:43 -07:00
pnp
power scripts/spelling.txt: add "intialization" pattern and fix typo instances 2017-02-27 18:43:47 -08:00
powercap
pps
ps3 sched/headers: Prepare for new header dependencies before moving code to <linux/sched/signal.h> 2017-03-02 08:42:29 +01:00
ptp PTP: fix ptr_ret.cocci warnings 2017-03-20 16:25:06 +01:00
pwm pwm: Changes for v4.11-rc1 2017-03-01 09:46:02 -08:00
rapidio drivers/rapidio/devices/tsi721.c: make module parameter variable name unique 2017-03-31 17:13:30 -07:00
ras
regulator regulator: Updates for v4.11 2017-02-20 17:23:57 -08:00
remoteproc remoteproc: qcom: fix QCOM_SMD dependencies 2017-03-20 14:45:44 -07:00
reset ARM: SoC driver updates 2017-02-23 15:57:04 -08:00
rpmsg virtio, vhost: optimizations, fixes 2017-03-02 13:53:13 -08:00
rtc sched/headers: Prepare to move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h> 2017-03-02 08:42:32 +01:00
s390 Merge branch 'WIP.sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-03-03 10:16:38 -08:00
sbus
scsi SCSI fixes on 20170401 2017-04-01 20:07:31 -07:00
sfi
sh
sn
soc sched/headers: Prepare to move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h> 2017-03-02 08:42:32 +01:00
spi sched/headers: Prepare for new header dependencies before moving code to <uapi/linux/sched/types.h> 2017-03-02 08:42:27 +01:00
spmi
ssb
staging Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-03-14 21:31:23 -07:00
target tcmu: Convert cmd_time_out into backend device attribute 2017-03-18 16:32:30 -07:00
tc
thermal thermal: cpu_cooling: Check OPP for errors 2017-03-13 10:06:55 +08:00
thunderbolt
tty imx-serial: Reduce RX DMA startup latency when opening for reading 2017-04-11 21:36:43 +02:00
uio sched/headers: Prepare to move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h> 2017-03-02 08:42:32 +01:00
usb usb: phy: isp1301: Fix build warning when CONFIG_OF is disabled 2017-03-29 12:13:50 +02:00
uwb uwb: i1480-dfu: fix NULL-deref at probe 2017-03-14 17:07:31 +08:00
vfio VFIO fixes for v4.11-rc4 2017-03-24 14:39:36 -07:00
vhost vhost-vsock: add pkt cancel capability 2017-03-21 14:41:46 -07:00
video sched/headers: Remove the <linux/mm_types.h> dependency from <linux/sched.h> 2017-03-03 01:45:16 +01:00
virt
virtio virtio_balloon: prevent uninitialized variable use 2017-03-28 20:41:28 +03:00
vlynq
vme
w1 sched/headers: Prepare for new header dependencies before moving code to <linux/sched/signal.h> 2017-03-02 08:42:29 +01:00
watchdog watchdog: retu: restore MFD dependency 2017-03-01 06:15:10 -08:00
xen xen/acpi: upload PM state from init-domain to Xen 2017-03-23 12:00:02 -04:00
zorro
Kconfig drivers/fsi: Add empty fsi bus definitions 2017-02-10 15:19:48 +01:00
Makefile pci-v4.11-changes 2017-02-23 11:53:22 -08:00