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ASoC: fsl_sai: Fix 32 slots TDM broken by integer shift UB in xMR write

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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: 770f58d7d2 ("ASoC: fsl_sai: Support multiple data channel enable bits")
Cc: stable@vger.kernel.org
Signed-off-by: Chancel Liu <chancel.liu@nxp.com>
Reviewed-by: Shengjiu Wang <shengjiu.wang@gmail.com>
Link: https://patch.msgid.link/20260601083327.1535185-1-chancel.liu@oss.nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Chancel Liu 2026-06-01 17:33:27 +09:00 committed by Mark Brown
parent c9c64820a4
commit 4790af1cc2
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GPG Key ID: 24D68B725D5487D0
1 changed files with 1 additions and 1 deletions
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2
sound/soc/fsl/fsl_sai.c
View File

@ -793,7 +793,7 @@ 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),
~0UL - ((1 << min(channels, slots)) - 1));
~GENMASK_U32(min(channels, slots) - 1, 0));
return 0;
}