linux-uconsole/drivers/i2c
Russell King beab31b2af i2c: fix bus recovery stop mode timing
commit cf8ce8b80f upstream.

The I2C specification states that tsu:sto for standard mode timing must
be at minimum 4us. Pictographically, this is:

SCL: ____/~~~~~~~~~
SDA: _________/~~~~
       ->|    |<- 4us minimum

We are currently waiting 2.5us between asserting SCL and SDA, which is
in violation of the standard. Adjust the timings to ensure that we meet
what is stipulated as the minimum timings to ensure that all devices
correctly interpret the STOP bus transition.

This is more important than trying to generate a square wave with even
duty cycle.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-01-14 20:06:58 +01:00
..
algos i2c: algos: bit: make the error messages grepable 2018-08-30 23:11:42 +02:00
busses i2c: imx: don't print error message on probe defer 2019-12-13 08:51:57 +01:00
muxes Merge branch 'i2c-mux/for-next' of https://github.com/peda-r/i2c-mux into i2c/for-4.19 2018-08-04 23:05:11 +02:00
i2c-boardinfo.c i2c: i2c-boardinfo: fix memory leaks on devinfo 2017-11-27 19:14:29 +01:00
i2c-core-acpi.c i2c: acpi: Force bus speed to 400KHz if a Silead touchscreen is present 2019-11-20 18:45:17 +01:00
i2c-core-base.c i2c: fix bus recovery stop mode timing 2020-01-14 20:06:58 +01:00
i2c-core-of.c i2c: core: fix use after free in of_i2c_notify 2019-12-13 08:51:07 +01:00
i2c-core-slave.c i2c: remove i2c_lock_adapter and use i2c_lock_bus directly 2018-07-13 00:09:37 +02:00
i2c-core-smbus.c i2c: smbus: add unlocked __i2c_smbus_xfer variant 2018-07-20 23:51:37 +02:00
i2c-core.h i2c: make i2c_check_addr_validity() static 2018-03-24 14:07:23 +01:00
i2c-dev.c i2c: dev: fix potential memory leak in i2cdev_ioctl_rdwr 2019-06-22 08:15:17 +02:00
i2c-mux.c Merge branch 'i2c/for-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2018-08-21 17:40:46 -07:00
i2c-slave-eeprom.c
i2c-smbus.c i2c: i2c-smbus: add of_i2c_setup_smbus_alert 2017-10-28 23:42:47 +02:00
i2c-stub.c treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
Kconfig Merge branch 'i2c/for-4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2016-12-15 12:56:35 -08:00
Makefile i2c: don't use any __deprecated handling anymore 2018-08-24 17:26:43 +02:00