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The current write and notify SDM to read mechanism has a flaw where SDM is not notified enough to be able to read all the data in the buffer. This is caused by SDM doorbell will only be sent out once the command buffer overflow check is satisfied. If the command buffer does not reach overflow status, no SDM doorbell will be sent out, which may cause a timeout as the mailbox driver will be waiting for the SDM to read the buffer to empty even though SDM is not notified to do so. The solution is to remove the command buffer overflow check and set the SDM doorbell to always trigger at the end of the command buffer. This will ensure that the SDM is able to read all of the data. Signed-off-by: Alif Zakuan Yuslaimi <alif.zakuan.yuslaimi@altera.com>