linux-kernel - [RFC PATCH 23/40] soundwire: stream: fix disable sequence

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Message-Id: <20190725234032.21152-24-pierre-louis.bossart@linux.intel.com>
Date:   Thu, 25 Jul 2019 18:40:15 -0500
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,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>
Subject: [RFC PATCH 23/40] soundwire: stream: fix disable sequence

When we disable the stream and then call hw_free, two bank switches
will be handled and as a result we re-enable the stream on hw_free.

Make sure the stream is disabled on both banks.

TODO: we need to completely revisit all this and make sure we have a
mirroring mechanism between current and alternate banks.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
---
 drivers/soundwire/stream.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/drivers/soundwire/stream.c b/drivers/soundwire/stream.c
index 53f5e790fcd7..75b9ad1fb1a6 100644
--- a/drivers/soundwire/stream.c
+++ b/drivers/soundwire/stream.c
@@ -1637,7 +1637,24 @@ static int _sdw_disable_stream(struct sdw_stream_runtime *stream)
 		}
 	}
 
-	return do_bank_switch(stream);
+	ret = do_bank_switch(stream);
+	if (ret < 0) {
+		dev_err(bus->dev, "Bank switch failed: %d\n", ret);
+		return ret;
+	}
+
+	/* make sure alternate bank (previous current) is also disabled */
+	list_for_each_entry(m_rt, &stream->master_list, stream_node) {
+		bus = m_rt->bus;
+		/* Disable port(s) */
+		ret = sdw_enable_disable_ports(m_rt, false);
+		if (ret < 0) {
+			dev_err(bus->dev, "Disable port(s) failed: %d\n", ret);
+			return ret;
+		}
+	}
+
+	return 0;
 }
 
 /**
-- 
2.20.1