Lucas De Marchi 0317e6c0f1 i2c: designware: do not disable adapter after transfer ... Disabling the adapter after each transfer adds additional delays for each I2C transfer. Even if we don't wait for it to be disabled anymore, on next transfer we will need to if we have several transfers in a row. Now during the transfer init we check if IC_TAR can be changed dynamically, the status register for no activity and TX buffer being empty. In this case we don't need to disable it When a transfer fails the adapter will still be disabled - this is a conservative approach. When transfers succeed, the adapter is left enabled and it's configured so to disable interrupts. Alternating register reads on 2 slaves: perf stat -r4 chrt -f 10 ./i2c-test /dev/i2c-1 25000 0x40 0x6 0x1e 0x00 Before: 8.638705161 seconds time elapsed ( +- 5.90% ) After: 7.516821591 seconds time elapsed ( +- 0.11% ) Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com> Signed-off-by: José Roberto de Souza <jose.souza@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 00:42:16 +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
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-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-bcm2835.c	i2c: bcm2835: Don't complain on -EPROBE_DEFER from getting our clock	2016-07-22 09:23:53 +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: do not disable adapter after transfer	2016-08-26 00:42:16 +02:00
i2c-designware-core.h	i2c: designware: detect when dynamic tar update is possible	2016-08-26 00:42:15 +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-ibm_iic: Whitespace cleanup	2008-01-27 18:14:45 +01:00
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
scx200_acb.c	Driver core patches for 3.19-rc1	2014-12-14 16:10:09 -08:00