From: Bard Liao <yung-chuan.liao@linux.intel.com>
To: alsa-devel@alsa-project.org, vkoul@kernel.org
Cc: vinod.koul@linaro.org, linux-kernel@vger.kernel.org,
gregkh@linuxfoundation.org, srinivas.kandagatla@linaro.org,
rander.wang@linux.intel.com, hui.wang@canonical.com,
pierre-louis.bossart@linux.intel.com, sanyog.r.kale@intel.com,
bard.liao@intel.com
Subject: [PATCH] soundwire: cadence: only prepare attached devices on clock stop
Date: Tue, 23 Mar 2021 09:37:07 +0800 [thread overview]
Message-ID: <20210323013707.21455-1-yung-chuan.liao@linux.intel.com> (raw)
From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
We sometimes see COMMAND_IGNORED responses during the clock stop
sequence. It turns out we already have information if devices are
present on a link, so we should only prepare those when they
are attached.
In addition, even when COMMAND_IGNORED are received, we should still
proceed with the clock stop. The device will not be prepared but
that's not a problem.
The only case where the clock stop will fail is if the Cadence IP
reports an error (including a timeout), or if the devices throw a
COMMAND_FAILED response.
BugLink: https://github.com/thesofproject/linux/issues/2621
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
---
drivers/soundwire/cadence_master.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c
index d05442e646a3..57c59a33ce61 100644
--- a/drivers/soundwire/cadence_master.c
+++ b/drivers/soundwire/cadence_master.c
@@ -1450,10 +1450,12 @@ int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake)
}
/* Prepare slaves for clock stop */
- ret = sdw_bus_prep_clk_stop(&cdns->bus);
- if (ret < 0) {
- dev_err(cdns->dev, "prepare clock stop failed %d", ret);
- return ret;
+ if (slave_present) {
+ ret = sdw_bus_prep_clk_stop(&cdns->bus);
+ if (ret < 0 && ret != -ENODATA) {
+ dev_err(cdns->dev, "prepare clock stop failed %d\n", ret);
+ return ret;
+ }
}
/*
--
2.17.1
next reply other threads:[~2021-03-23 1:37 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-23 1:37 Bard Liao [this message]
2021-03-30 9:06 ` [PATCH] soundwire: cadence: only prepare attached devices on clock stop Vinod Koul
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