This is a note to let you know that I've just added the patch titled i2c: mpc: Restore reread of I2C status register to the 5.13-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: i2c-mpc-restore-reread-of-i2c-status-register.patch and it can be found in the queue-5.13 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 1df5ad62286cb1a2cb8b180a29a62f70e2fb49f4 Author: Chris Packham <chris.packham@xxxxxxxxxxxxxxxxxxx> Date: Fri Jul 2 15:27:24 2021 +1200 i2c: mpc: Restore reread of I2C status register [ Upstream commit 763778cd79267dadf0ec7e044caf7563df0ab597 ] Prior to commit 1538d82f4647 ("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: 1538d82f4647 ("i2c: mpc: Interrupt driven transfer") Signed-off-by: Chris Packham <chris.packham@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Wolfram Sang <wsa@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/i2c/busses/i2c-mpc.c b/drivers/i2c/busses/i2c-mpc.c index dcca9c2396db..6d5014ebaab5 100644 --- a/drivers/i2c/busses/i2c-mpc.c +++ b/drivers/i2c/busses/i2c-mpc.c @@ -635,6 +635,8 @@ 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;