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i2c: mpc: Restore reread of I2C status register

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Prior to commit 1538d82f46 ("i2c: mpc: Interrupt driven transfer") the
old interrupt handler would reread MPC_I2C_SR after checking the CSR_MIF
bit. When the driver was re-written this was removed as it seemed
unnecessary. However as it turns out this is necessary for i2c devices
which do clock stretching otherwise we end up thinking the bus is still
busy when processing the interrupt.

Fixes: 1538d82f46 ("i2c: mpc: Interrupt driven transfer")
Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
This commit is contained in:
Chris Packham 2021-07-02 15:27:24 +12:00 committed by Wolfram Sang
parent 87cf512796
commit 763778cd79
1 changed files with 2 additions and 0 deletions
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2
drivers/i2c/busses/i2c-mpc.c
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@ -564,6 +564,8 @@ static irqreturn_t mpc_i2c_isr(int irq, void *dev_id)
status = readb(i2c->base + MPC_I2C_SR);
if (status & CSR_MIF) {
/* Read again to allow register to stabilise */
status = readb(i2c->base + MPC_I2C_SR);
writeb(0, i2c->base + MPC_I2C_SR);
mpc_i2c_do_intr(i2c, status);
return IRQ_HANDLED;