linux-kernel - Re: [PATCH v2 3/3] soundwire: qcom: add in-band wake up interrupt support

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Message-ID: <87f434b5-0e99-d1d1-e4d1-248cf35cd05c@linux.intel.com>
Date:   Thu, 24 Feb 2022 09:44:23 -0600
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        robh+dt@...nel.org, vkoul@...nel.org,
        yung-chuan.liao@...ux.intel.com
Cc:     devicetree@...r.kernel.org, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, quic_srivasam@...cinc.com
Subject: Re: [PATCH v2 3/3] soundwire: qcom: add in-band wake up interrupt
 support



On 2/24/22 07:31, Srinivas Kandagatla wrote:
> Some of the Qualcomm SoundWire Controller instances like the ones that are
> connected to RX path along with Headset connections support Waking up
> Controller from Low power clock stop state using SoundWire In-band interrupt.
> SoundWire Slave on the bus would intiate this by pulling the data line high,

typo: initiate

> during clock stop condition.

while the clock is stopped.

A peripheral cannot generate an interrupt after a successful completion
of a write to the ClockStopNow bitfield.