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 8b262e7f5275f9cd5f8d102a3c47aec276cb54e2..c8f6f5122cacb77e6ca6aa1baef21ef9027f2bb5 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)