linux-kernel - [PATCH] ASoC: SOF: ipc4-pcm: Fix incorrect comparison with number of tdm

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Message-Id: <20250819160525.423416-1-rf@opensource.cirrus.com>
Date: Tue, 19 Aug 2025 17:05:25 +0100
From: Richard Fitzgerald <rf@...nsource.cirrus.com>
To: broonie@...nel.org, peter.ujfalusi@...ux.intel.com,
        yung-chuan.liao@...ux.intel.com, ranjani.sridharan@...ux.intel.com,
        kai.vehmanen@...ux.intel.com
Cc: sound-open-firmware@...a-project.org, linux-sound@...r.kernel.org,
        linux-kernel@...r.kernel.org, patches@...nsource.cirrus.com
Subject: [PATCH] ASoC: SOF: ipc4-pcm: Fix incorrect comparison with number of tdm_slots

In ipc4_ssp_dai_config_pcm_params_match() when comparing params_channels()
against hw_config->tdm_slots the comparison should be a <= not a ==.

The number of TDM slots must be enough for the number of required channels.
But it can be greater. There are various reason why a I2S/TDM link has more
TDM slots than a particular audio stream needs.

The original comparison would fail on systems that had more TDM slots.

Signed-off-by: Richard Fitzgerald <rf@...nsource.cirrus.com>
Fixes: 8a07944a77e9 ("ASoC: SOF: ipc4-pcm: Look for best matching hw_config for SSP")
---
 sound/soc/sof/ipc4-pcm.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sound/soc/sof/ipc4-pcm.c b/sound/soc/sof/ipc4-pcm.c
index 374dc10d10fd..86f7377fb92f 100644
--- a/sound/soc/sof/ipc4-pcm.c
+++ b/sound/soc/sof/ipc4-pcm.c
@@ -639,14 +639,14 @@ static int ipc4_ssp_dai_config_pcm_params_match(struct snd_sof_dev *sdev,
 
 		if (params_rate(params) == le32_to_cpu(hw_config->fsync_rate) &&
 		    params_width(params) == le32_to_cpu(hw_config->tdm_slot_width) &&
-		    params_channels(params) == le32_to_cpu(hw_config->tdm_slots)) {
+		    params_channels(params) <= le32_to_cpu(hw_config->tdm_slots)) {
 			current_config = le32_to_cpu(hw_config->id);
 			partial_match = false;
 			/* best match found */
 			break;
 		} else if (current_config < 0 &&
 			   params_rate(params) == le32_to_cpu(hw_config->fsync_rate) &&
-			   params_channels(params) == le32_to_cpu(hw_config->tdm_slots)) {
+			   params_channels(params) <= le32_to_cpu(hw_config->tdm_slots)) {
 			current_config = le32_to_cpu(hw_config->id);
 			partial_match = true;
 			/* keep looking for better match */
-- 
2.39.5