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2702ea7dbe
linux/drivers/i2c/busses
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José Roberto de Souza 2702ea7dbe i2c: designware: wait for disable/enable only if necessary 
If we aren't going to continue using the controller we can just disable
it instead of waiting for it to complete. The biggest improvement here
is when a I2C transaction is completed and it doesn't block until
the adapter is disabled. When a new transfer is needed we will disable
and wait for its completion.

This way the adapter will continue changing its state in parallel to the
execution of the thread that requested the I2C transaction saving most
of the time 25~250 usec per I2C transaction.

A simple program doing a register read (1 byte write, 1 byte read)
alternating on 2 different slaves repeated 25k times for each and
measurements taken 4 times we get:

perf stat -r4 chrt -f 10 ./i2c-test /dev/i2c-1 25000 0x40 0x6 0x1e 0x00

Before:
	30.879317977 seconds time elapsed                 ( +- 14.83% )
After:
	8.638705161 seconds time elapsed                  ( +-  5.90% )

Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Tested-by: Christian Ruppert <christian.ruppert@alitech.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2016-08-26 00:42:12 +02:00
..
i2c-acorn.c i2c: acorn: is tristate and should use module.h 2014-01-24 18:21:11 +01:00
i2c-ali15x3.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-ali1535.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-ali1563.c i2c: ali1563: fix checkpatch.pl issues 2014-05-22 10:09:21 +02:00
i2c-amd756-s4882.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-amd756.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-amd8111.c i2c: remove DEFINE_PCI_DEVICE_TABLE macro 2014-03-13 09:44:59 +01:00
i2c-at91.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-au1550.c i2c: au1550: Convert to devm_kzalloc and devm_ioremap_resource 2015-10-23 23:31:11 +02:00
i2c-axxia.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-bcm2835.c i2c: bcm2835: Don't complain on -EPROBE_DEFER from getting our clock 2016-07-22 09:23:53 +02:00
i2c-bcm-iproc.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-bcm-kona.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-bfin-twi.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-brcmstb.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-cadence.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-cbus-gpio.c i2c: busses: drop owner assignment from platform_drivers 2014-10-20 16:20:37 +02:00
i2c-cpm.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-cros-ec-tunnel.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-davinci.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-designware-baytrail.c i2c: designware-platform: Drop duplicate module information 2016-02-12 20:40:13 +01:00
i2c-designware-core.c i2c: designware: wait for disable/enable only if necessary 2016-08-26 00:42:12 +02:00
i2c-designware-core.h i2c: designware: Enable high speed mode 2016-08-26 00:42:07 +02:00
i2c-designware-pcidrv.c i2c: designware-pci: clarify a comment for Merrifield 2016-07-06 00:42:17 +09:00
i2c-designware-platdrv.c i2c: designware: Find bus speed from ACPI 2016-08-26 00:42:11 +02:00
i2c-digicolor.c i2c: digicolor: remove duplicate include 2015-04-23 19:35:32 +02:00
i2c-diolan-u2c.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-dln2.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-efm32.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-eg20t.c i2c: eg20t: set i2c_adapter->dev.of_node 2015-12-03 22:11:46 +01:00
i2c-elektor.c i2c: elektor: Utilize the module_isa_driver macro 2016-06-19 19:45:43 +02:00
i2c-emev2.c i2c: emev2: add slave support 2015-12-05 19:55:36 +01:00
i2c-exynos5.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-gpio.c i2c: busses: drop owner assignment from platform_drivers 2014-10-20 16:20:37 +02:00
i2c-highlander.c i2c: busses: drop owner assignment from platform_drivers 2014-10-20 16:20:37 +02:00
i2c-hix5hd2.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-hydra.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-i801.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-ibm_iic.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-ibm_iic.h
i2c-img-scb.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-imx.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-iop3xx.c i2c: iop3xx: use new 8 bit address helper function 2016-04-11 18:54:59 +02:00
i2c-iop3xx.h i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-isch.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-ismt.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-jz4780.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-kempld.c i2c: busses: drop owner assignment from platform_drivers 2014-10-20 16:20:37 +02:00
i2c-lpc2k.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-meson.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-mpc.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-mt65xx.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-mv64xxx.c i2c: mv64xxx: remove CONFIG_HAVE_CLK conditionals 2016-04-27 19:03:15 +02:00
i2c-mxs.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-nforce2-s4985.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-nforce2.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-nomadik.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-ocores.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-octeon-core.c i2c: octeon: Use booleon values for booleon variables 2016-08-26 00:42:00 +02:00
i2c-octeon-core.h i2c: octeon,thunderx: Move register offsets to struct 2016-08-26 00:41:57 +02:00
i2c-octeon-platdrv.c i2c: octeon: Sort include files alphabetically 2016-08-26 00:41:58 +02:00
i2c-omap.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-opal.c powerpc/opal: Add inline function to get rc from an ASYNC_COMP opal_msg 2016-06-29 17:33:18 +10:00
i2c-parport-light.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
i2c-parport.c i2c: parport: start using pr_fmt 2015-08-10 08:37:28 +02:00
i2c-parport.h i2c: parport: Add VCT-jig adapter 2015-08-10 08:37:34 +02:00
i2c-pasemi.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-pca-isa.c i2c: pca-isa: Utilize the module_isa_driver macro 2016-06-19 19:49:29 +02:00
i2c-pca-platform.c i2c: pca-platform: fix broken email address 2015-04-23 19:35:30 +02:00
i2c-piix4.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-pmcmsp.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-pnx.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-powermac.c i2c: powermac: use new 8 bit address helper function 2016-04-11 18:54:59 +02:00
i2c-puv3.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-pxa-pci.c i2c: remove DEFINE_PCI_DEVICE_TABLE macro 2014-03-13 09:44:59 +01:00
i2c-pxa.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-qup.c Merge branch 'i2c/for-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2016-07-27 14:19:25 -07:00
i2c-rcar.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-riic.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-rk3x.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-robotfuzz-osif.c i2c: robotfuzz-osif: Constify osif_table 2016-06-13 22:32:09 +02:00
i2c-s3c2410.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-scmi.c i2c: delete non-required instances of include <linux/init.h> 2014-01-24 18:24:31 +01:00
i2c-sh7760.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-sh_mobile.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-sibyte.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-simtec.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
i2c-sirf.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-sis96x.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-sis630.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-sis5595.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-st.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-stu300.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-sun6i-p2wi.c i2c: busses: drop owner assignment from platform_drivers 2014-10-20 16:20:37 +02:00
i2c-taos-evm.c i2c: taos-evm: replace simple_strtoul by kstrtou8 2015-11-30 18:37:22 +01:00
i2c-tegra.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-thunderx-pcidrv.c i2c: octeon,thunderx: Move register offsets to struct 2016-08-26 00:41:57 +02:00
i2c-tiny-usb.c i2c: i2c-tiny-usb: Remove RobotFuzz USB vendor:product ID 2014-01-13 13:56:52 +01:00
i2c-uniphier-f.c i2c: uniphier{-f}: don't print error when adding adapter fails 2016-08-22 08:19:56 +02:00
i2c-uniphier.c i2c: uniphier{-f}: don't print error when adding adapter fails 2016-08-22 08:19:56 +02:00
i2c-versatile.c i2c: versatile: Convert to use resource managed devm_* APIs 2016-07-14 21:21:56 +09:00
i2c-via.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-viapro.c i2c: remove FSF address 2014-11-07 18:35:33 +01:00
i2c-viperboard.c i2c: viperboard: clean up inconsistent indenting 2015-08-10 08:37:38 +02:00
i2c-wmt.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-xgene-slimpro.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-xiic.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-xlp9xx.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
i2c-xlr.c i2c: don't print error when adding adapter fails 2016-08-22 08:19:55 +02:00
Kconfig i2c: thunderx: Add SMBUS alert support 2016-08-26 00:41:56 +02:00
Makefile i2c: thunderx: Add i2c driver for ThunderX SOC 2016-08-26 00:41:55 +02:00
scx200_acb.c Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00