linux-kernel - [PATCH 10/10] soundwire: bus: don't treat CMD

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Message-Id: <20200115000844.14695-11-pierre-louis.bossart@linux.intel.com>
Date:   Tue, 14 Jan 2020 18:08:44 -0600
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     alsa-devel@...a-project.org
Cc:     linux-kernel@...r.kernel.org, tiwai@...e.de, broonie@...nel.org,
        vkoul@...nel.org, gregkh@...uxfoundation.org, jank@...ence.com,
        srinivas.kandagatla@...aro.org, slawomir.blauciak@...el.com,
        Bard liao <yung-chuan.liao@...ux.intel.com>,
        Rander Wang <rander.wang@...ux.intel.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>
Subject: [PATCH 10/10] soundwire: bus: don't treat CMD_IGNORED as error on ClockStop

If a SoundWire link is enabled, but there are no Slave devices exposed
in firmware tables for this link, or no Slaves in ATTACHED or ALERT
mode, the CMD_IGNORED/-ENODATA error code on a broadcast write is
perfectly legit.

Filter this case to report errors and let the caller deal with the
CMD_IGNORED case.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
---
 drivers/soundwire/bus.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c
index 3395abd2ed39..13887713f311 100644
--- a/drivers/soundwire/bus.c
+++ b/drivers/soundwire/bus.c
@@ -922,8 +922,12 @@ int sdw_bus_clk_stop(struct sdw_bus *bus)
 	ret = sdw_bwrite_no_pm(bus, SDW_BROADCAST_DEV_NUM,
 			       SDW_SCP_CTRL, SDW_SCP_CTRL_CLK_STP_NOW);
 	if (ret < 0) {
-		dev_err(bus->dev,
-			"ClockStopNow Broadcast message failed %d", ret);
+		if (ret == -ENODATA)
+			dev_dbg(bus->dev,
+				"ClockStopNow Broadcast msg ignored %d", ret);
+		else
+			dev_err(bus->dev,
+				"ClockStopNow Broadcast msg failed %d", ret);
 		return ret;
 	}
 
-- 
2.20.1