From: Chancel Liu <[email protected]>
When configuring 32 slots TDM (channels == slots == 32), the xMR
(Mask Register) write used:
~0UL - ((1 << min(channels, slots)) - 1)
The literal "1" is a signed 32-bit int. Shifting it by 32 positions is
undefined behaviour which may set this register to 0xFFFFFFFF, masking
all 32 slots.
Use GENMASK_U32() macro instead. For 32 slots this produces a zero mask:
~GENMASK_U32(31, 0) = ~0xFFFFFFFF = 0x00000000
Behaviour for fewer than 32 slots is unchanged.
Fixes: 770f58d7d2c5 ("ASoC: fsl_sai: Support multiple data channel enable bits")
Cc: [email protected]
Signed-off-by: Chancel Liu <[email protected]>
---
Changes in v2
- Use GENMASK_U32() macro instead to make it clearer and safer
sound/soc/fsl/fsl_sai.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c
index 821e3bd51b6e..9661602b53c5 100644
--- a/sound/soc/fsl/fsl_sai.c
+++ b/sound/soc/fsl/fsl_sai.c
@@ -797,7 +797,7 @@ static int fsl_sai_hw_params(struct snd_pcm_substream
*substream,
FSL_SAI_CR4_FSD_MSTR, FSL_SAI_CR4_FSD_MSTR);
regmap_write(sai->regmap, FSL_SAI_xMR(tx),
- ~0ULL - ((1ULL << min(channels, slots)) - 1));
+ ~GENMASK_U32(min(channels, slots) - 1, 0));
return 0;
}
--
2.50.1
