On 11-05-21, 10:52, Bard Liao wrote:
From: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com
The Cadence IP can be configured in two different ways to deal with CMD_IGNORED replies to broadcast commands. The CMD_ACCEPT bitfield controls whether the command is discarded or if the IP proceeds with the change (typically a bank switch or clock stop command).
The existing code seems to be inconsistent: a) For some historical reason, we set this CMD_ACCEPT bitfield during the initialization, but we don't during a resume from a clock-stoppped state. b) In addition, the loop used in the clock-stop sequence is quite racy, it's possible that a device has lost sync but it's still tagged as ATTACHED. c) If somehow a Device loses sync and is unable to ack a broadcast command, we do not have an error handling mechanism anyways. The IP should go ahead and let the Device regain sync at a later time.
Make sure the CMD_ACCEPT bit is always set.
Applied, thanks