ASoC: tas2764: Fix set_tdm_slot in case of single slot

[ Upstream commit faac764ea1ea6898d93e46c403271fb105c0906e ]

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: 827ed8a0fa50 ("ASoC: tas2764: Add the driver for the TAS2764")
Suggested-by: Jos Dehaes <jos.dehaes@gmail.com>
Signed-off-by: Martin Povišer <povik+lin@cutebit.org>
Link: https://lore.kernel.org/r/20221027095800.16094-2-povik+lin@cutebit.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/sound/soc/codecs/tas2764.c b/sound/soc/codecs/tas2764.c
index 39902f77a2e0f9bfdc1055dec1f3439b7c2b4e2a..6c87c3cf5ef749b934b8e2353abfd5eaa5a5ffeb 100644 (file)
--- a/sound/soc/codecs/tas2764.c
+++ b/sound/soc/codecs/tas2764.c
@@ -386,20 +386,13 @@ static int tas2764_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)