linux-kernel - Re: [RESEND PATCH] soundwire: cadence_master: always set CMD

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Date:   Tue, 11 May 2021 17:52:21 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Bard Liao <yung-chuan.liao@...ux.intel.com>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        gregkh@...uxfoundation.org, srinivas.kandagatla@...aro.org,
        rander.wang@...ux.intel.com, hui.wang@...onical.com,
        pierre-louis.bossart@...ux.intel.com, sanyog.r.kale@...el.com,
        bard.liao@...el.com
Subject: Re: [RESEND PATCH] soundwire: cadence_master: always set CMD_ACCEPT

On 11-05-21, 10:52, Bard Liao wrote:
> From: Pierre-Louis Bossart <pierre-louis.bossart@...ux.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

-- 
~Vinod