linux-kernel - [PATCH] soundwire: stream: Revert "soundwire: stream: fix programming slave ports for non-continous port maps"

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Message-ID: <20240904145228.289891-1-krzysztof.kozlowski@linaro.org>
Date: Wed,  4 Sep 2024 16:52:28 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Vinod Koul <vkoul@...nel.org>,
	Bard Liao <yung-chuan.liao@...ux.intel.com>,
	Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
	Sanyog Kale <sanyog.r.kale@...el.com>,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] soundwire: stream: Revert "soundwire: stream: fix programming slave ports for non-continous port maps"

This reverts commit ab8d66d132bc8f1992d3eb6cab8d32dda6733c84 because it
breaks codecs using non-continuous masks in source and sink ports.  The
commit missed the point that port numbers are not used as indices for
iterating over prop.sink_ports or prop.source_ports.

Soundwire core and existing codecs expect that the array passed as
prop.sink_ports and prop.source_ports is continuous.  The port mask still
might be non-continuous, but that's unrelated.

Reported-by: Bard Liao <yung-chuan.liao@...ux.intel.com>
Closes: https://lore.kernel.org/all/b6c75eee-761d-44c8-8413-2a5b34ee2f98@linux.intel.com/
Fixes: ab8d66d132bc ("soundwire: stream: fix programming slave ports for non-continous port maps")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

---

I will need to fix my codec drivers, but that's independent.
---
 drivers/soundwire/stream.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/soundwire/stream.c b/drivers/soundwire/stream.c
index f275143d7b18..7aa4900dcf31 100644
--- a/drivers/soundwire/stream.c
+++ b/drivers/soundwire/stream.c
@@ -1291,18 +1291,18 @@ struct sdw_dpn_prop *sdw_get_slave_dpn_prop(struct sdw_slave *slave,
 					    unsigned int port_num)
 {
 	struct sdw_dpn_prop *dpn_prop;
-	unsigned long mask;
+	u8 num_ports;
 	int i;
 
 	if (direction == SDW_DATA_DIR_TX) {
-		mask = slave->prop.source_ports;
+		num_ports = hweight32(slave->prop.source_ports);
 		dpn_prop = slave->prop.src_dpn_prop;
 	} else {
-		mask = slave->prop.sink_ports;
+		num_ports = hweight32(slave->prop.sink_ports);
 		dpn_prop = slave->prop.sink_dpn_prop;
 	}
 
-	for_each_set_bit(i, &mask, 32) {
+	for (i = 0; i < num_ports; i++) {
 		if (dpn_prop[i].num == port_num)
 			return &dpn_prop[i];
 	}
-- 
2.43.0