i2c: mpc: Use atomic read and fix break condition
Maxime points out that the polling code in mpc_i2c_isr should use the _atomic API because it is called in an irq context and that the behaviour of the MCF bit is that it is 1 when the byte transfer is complete. All of this means the original code was effectively a udelay(100). Fix this by using readb_poll_timeout_atomic() and removing the negation of the break condition. Fixes: 4a8ac5e4 ("i2c: mpc: Poll for MCF") Reported-by: NMaxime Bizon <mbizon@freebox.fr> Signed-off-by: NChris Packham <chris.packham@alliedtelesis.co.nz> Tested-by: NMaxime Bizon <mbizon@freebox.fr> Signed-off-by: NWolfram Sang <wsa@kernel.org>
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