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i2c: i2c-cdns: Start read transaction after write to transfer_size reg

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Avoid a race condition where read transaction is started
keeping expected bytes as 0. Which sometimes would result in sending
STOP signal as no data is expected. Observed on QEMU platform.

Signed-off-by: Sai Pavan Boddu <sai.pavan.boddu@xilinx.com>
Reviewed-by: Ashok Reddy Soma <ashok.reddy.soma@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Link: https://lore.kernel.org/r/487c8026791bfd60719403a2df2c54bb0ae99232.1646122610.git.michal.simek@xilinx.com
This commit is contained in:
Sai Pavan Boddu 2022-03-01 09:16:50 +01:00 committed by Michal Simek
parent d926695cc5
commit 1bc2a79a4c
1 changed files with 1 additions and 1 deletions
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2
drivers/i2c/i2c-cdns.c
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@ -375,7 +375,6 @@ static int cdns_i2c_read_data(struct i2c_cdns_bus *i2c_bus, u32 addr, u8 *data,
curr_recv_count = recv_count;
}
} else if (recv_count && !hold_quirk && !curr_recv_count) {
writel(addr, &regs->address);
if (recv_count > CDNS_I2C_TRANSFER_SIZE) {
writel(CDNS_I2C_TRANSFER_SIZE,
&regs->transfer_size);
@ -384,6 +383,7 @@ static int cdns_i2c_read_data(struct i2c_cdns_bus *i2c_bus, u32 addr, u8 *data,
writel(recv_count, &regs->transfer_size);
curr_recv_count = recv_count;
}
writel(addr, &regs->address);
}
}