Ondrej Jirman 7c62ae6c44 BACKPORT: i2c: rk3x: Handle a spurious start completion interrupt flag ... In a typical read transfer, start completion flag is being set after read finishes (notice ipd bit 4 being set): trasnfer poll=0 i2c start rk3x-i2c fdd40000.i2c: IRQ: state 1, ipd: 10 i2c read rk3x-i2c fdd40000.i2c: IRQ: state 2, ipd: 1b i2c stop rk3x-i2c fdd40000.i2c: IRQ: state 4, ipd: 33 This causes I2C transfer being aborted in polled mode from a stop completion handler: trasnfer poll=1 i2c start rk3x-i2c fdd40000.i2c: IRQ: state 1, ipd: 10 i2c read rk3x-i2c fdd40000.i2c: IRQ: state 2, ipd: 0 rk3x-i2c fdd40000.i2c: IRQ: state 2, ipd: 1b i2c stop rk3x-i2c fdd40000.i2c: IRQ: state 4, ipd: 13 i2c stop rk3x-i2c fdd40000.i2c: unexpected irq in STOP: 0x10 Clearing the START flag after read fixes the issue without any obvious side effects. This issue was dicovered on RK3566 when adding support for powering off the RK817 PMIC. Signed-off-by: Ondrej Jirman <megous@megous.com> Reviewed-by: John Keeping <john@metanate.com> Signed-off-by: Wolfram Sang <wsa@kernel.org> (cherry picked from commit 02fe0fbd8a) Signed-off-by: David Wu <david.wu@rock-chips.com> Change-Id: I9cf23d9a9bc9560a421c6fe13a82a6637d8a1432		2022-03-14 15:28:45 +08:00
..
algos	i2c: algo: pca: Reapply i2c bus settings after reset	2020-09-09 10:22:40 +02:00
busses	BACKPORT: i2c: rk3x: Handle a spurious start completion interrupt flag	2022-03-14 15:28:45 +08:00
muxes	i2c: mux: reg: Simplify with dev_err_probe()	2020-09-18 23:02:03 +02:00
i2c-boardinfo.c
i2c-core-acpi.c	i2c: core: Restore acpi_walk_dep_device_list() getting called after registering the ACPI i2c devs	2020-10-25 13:33:54 +01:00
i2c-core-base.c	Merge tag 'ASB-2021-12-05_12-5.10' of https://android.googlesource.com/kernel/common	2021-12-14 17:09:02 +08:00
i2c-core-of.c	ANDROID: i2c: Add vendor hook to allow assign dev_name to I2C devices	2021-05-07 07:13:22 -07:00
i2c-core-slave.c
i2c-core-smbus.c
i2c-core.h	i2c: acpi: Remove dead code, i.e. i2c_acpi_match_device()	2020-08-25 09:22:09 +02:00
i2c-dev.c	i2c: dev: zero out array used for i2c reads from userspace	2021-08-18 08:59:05 +02:00
i2c-mux.c
i2c-slave-eeprom.c
i2c-slave-testunit.c	i2c: add slave testunit driver	2020-09-21 11:02:17 +02:00
i2c-smbus.c	i2c: smbus: add core function handling SMBus host-notify	2020-09-09 10:38:28 +02:00
i2c-stub.c
Kconfig	i2c: add slave testunit driver	2020-09-21 11:02:17 +02:00
Makefile	i2c: add slave testunit driver	2020-09-21 11:02:17 +02:00