linux-kernel - [PATCH 3/3] ASoC: tas2780: Fix set_tdm

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Message-Id: <20221027095800.16094-3-povik+lin@cutebit.org>
Date:   Thu, 27 Oct 2022 11:58:00 +0200
From:   Martin Povišer <povik+lin@...ebit.org>
To:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>
Cc:     Stephen Kitt <steve@....org>, Raphael-Xu <13691752556@....com>,
        Frank Shi <shifu0704@...ndersoft.com>, shenghao-ding@...com,
        kevin-lu@...com, Jos Dehaes <jos.dehaes@...il.com>,
        alsa-devel@...a-project.org, asahi@...ts.linux.dev,
        linux-kernel@...r.kernel.org,
        Martin Povišer <povik+lin@...ebit.org>
Subject: [PATCH 3/3] ASoC: tas2780: Fix set_tdm_slot in case of single slot

There's a special branch in the set_tdm_slot op for the case of nslots
being 1, but:

 (1) That branch can never work (there's a check for tx_mask being
     non-zero, later there's another check for it *being* zero; one or
     the other always throws -EINVAL).

 (2) The intention of the branch seems to be what the general other
     branch reduces to in case of nslots being 1.

For those reasons remove the 'nslots being 1' special case.

Fixes: eae9f9ce181b ("ASoC: add tas2780 driver")
Suggested-by: Jos Dehaes <jos.dehaes@...il.com>
Signed-off-by: Martin Povišer <povik+lin@...ebit.org>
---
 sound/soc/codecs/tas2780.c | 19 ++++++-------------
 1 file changed, 6 insertions(+), 13 deletions(-)

diff --git a/sound/soc/codecs/tas2780.c b/sound/soc/codecs/tas2780.c
index a6db6f0e5431..afdf0c863aa1 100644
--- a/sound/soc/codecs/tas2780.c
+++ b/sound/soc/codecs/tas2780.c
@@ -380,20 +380,13 @@ static int tas2780_set_dai_tdm_slot(struct snd_soc_dai *dai,
 	if (tx_mask == 0 || rx_mask != 0)
 		return -EINVAL;
 
-	if (slots == 1) {
-		if (tx_mask != 1)
-			return -EINVAL;
-		left_slot = 0;
-		right_slot = 0;
+	left_slot = __ffs(tx_mask);
+	tx_mask &= ~(1 << left_slot);
+	if (tx_mask == 0) {
+		right_slot = left_slot;
 	} else {
-		left_slot = __ffs(tx_mask);
-		tx_mask &= ~(1 << left_slot);
-		if (tx_mask == 0) {
-			right_slot = left_slot;
-		} else {
-			right_slot = __ffs(tx_mask);
-			tx_mask &= ~(1 << right_slot);
-		}
+		right_slot = __ffs(tx_mask);
+		tx_mask &= ~(1 << right_slot);
 	}
 
 	if (tx_mask != 0 || left_slot >= slots || right_slot >= slots)
-- 
2.33.0