i2c: pxa: clear all master action bits in i2c_pxa_stop_message()
[ Upstream commit e81c979f4e
]
If we timeout during a message transfer, the control register may
contain bits that cause an action to be set. Read-modify-writing the
register leaving these bits set may trigger the hardware to attempt
one of these actions unintentionally.
Always clear these bits when cleaning up after a message or after
a timeout.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
parent
ceb63ec0ef
commit
8a44731af6
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@ -706,11 +706,9 @@ static inline void i2c_pxa_stop_message(struct pxa_i2c *i2c)
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{
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u32 icr;
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/*
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* Clear the STOP and ACK flags
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*/
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/* Clear the START, STOP, ACK, TB and MA flags */
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icr = readl(_ICR(i2c));
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icr &= ~(ICR_STOP | ICR_ACKNAK);
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icr &= ~(ICR_START | ICR_STOP | ICR_ACKNAK | ICR_TB | ICR_MA);
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writel(icr, _ICR(i2c));
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}
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