[SRU][OEM-5.6][PATCH 12/15] soundwire: bus: filter-out unwanted interrupt reports

Hui Wang hui.wang at canonical.com
Fri Oct 16 01:22:34 UTC 2020

From: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>

BugLink: https://bugs.launchpad.net/bugs/1900069

Unlike the traditional usage, in the SoundWire specification the
interrupt masks only gate the propagation of an interrupt condition to
the PING frame status. They do not gate the changes of the INT_STAT
registers, which will happen regardless of the mask settings. See
Figure 116 of the SoundWire 1.2 specification for an in-depth
description of the interrupt model.

When the bus driver reads the SCP_INT1_STAT register, it will retrieve
all the interrupt status, including for the mask fields that were not
explicitly set. For example, even if the PARITY mask is not set, the
PARITY error status will be reported if an implementation-defined
interrupt for jack detection is enabled and occurs.

Filtering undesired interrupt reports and handling has to be
implemented in software. This patch enables this filtering for the
INT1_IMPL_DEF, PARITY and BUS_CLASH interrupt sources.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao at linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen at linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski at linux.intel.com>
Link: https://lore.kernel.org/r/20200908134521.6781-3-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul at kernel.org>
(backported from commit 310f6dc6dc5d7372e878e3e401ae087b63d545de linux-next)
Signed-off-by: Hui Wang <hui.wang at canonical.com>
 drivers/soundwire/bus.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c
index 930dce04b793..9b74d38511e6 100644
--- a/drivers/soundwire/bus.c
+++ b/drivers/soundwire/bus.c
@@ -1258,12 +1258,14 @@ static int sdw_handle_slave_alerts(struct sdw_slave *slave)
 		 * interrupt
 		if (buf & SDW_SCP_INT1_PARITY) {
-			dev_err(&slave->dev, "Parity error detected\n");
+			if (slave->prop.scp_int1_mask & SDW_SCP_INT1_PARITY)
+				dev_err(&slave->dev, "Parity error detected\n");
 			clear |= SDW_SCP_INT1_PARITY;
 		if (buf & SDW_SCP_INT1_BUS_CLASH) {
-			dev_err(&slave->dev, "Bus clash error detected\n");
+			if (slave->prop.scp_int1_mask & SDW_SCP_INT1_BUS_CLASH)
+				dev_err(&slave->dev, "Bus clash detected\n");
 			clear |= SDW_SCP_INT1_BUS_CLASH;
@@ -1275,9 +1277,11 @@ static int sdw_handle_slave_alerts(struct sdw_slave *slave)
 		if (buf & SDW_SCP_INT1_IMPL_DEF) {
-			dev_dbg(&slave->dev, "Slave impl defined interrupt\n");
+			if (slave->prop.scp_int1_mask & SDW_SCP_INT1_IMPL_DEF) {
+				dev_dbg(&slave->dev, "Slave impl defined interrupt\n");
+				slave_notify = true;
+			}
 			clear |= SDW_SCP_INT1_IMPL_DEF;
-			slave_notify = true;
 		/* Check port 0 - 3 interrupts */

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