i2c: mediatek: Disable i2c start_en and clear intr_stat brfore reset

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commit fed1bd51a5 upstream.

The i2c controller driver do dma reset after transfer timeout,
but sometimes dma reset will trigger an unexpected DMA_ERR irq.
It will cause the i2c controller to continuously send interrupts
to the system and cause soft lock-up. So we need to disable i2c
start_en and clear intr_stat to stop i2c controller before dma
reset when transfer timeout.

Fixes: aafced673c06("i2c: mediatek: move dma reset before i2c reset")
Signed-off-by: Qii Wang <qii.wang@mediatek.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Qii Wang 2021-05-27 20:04:04 +08:00 • committed by Greg Kroah-Hartman

parent eff3c5b67f

commit 87f18aa51e

1 changed files with 5 additions and 0 deletions

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drivers/i2c/busses/i2c-mt65xx.c

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