[PATCH] ASoC: rockchip: rockchip_sai: Set slot width for non-TDM mode

[Alexey Charkov]

Currently the slot width in non-TDM mode is always kept at the POR value
of 32 bits, regardless of the sample width, which doesn't work well for
some codecs such as NAU8822.

Set the slot width according to the sample width in non-TDM mode, which
is what other CPU DAI drivers do.

Tested on the following RK3576 configurations:
- SAI2 + NAU8822 (codec as the clock master), custom board
- SAI1 + ES8388 (codec as the clock master), RK3576 EVB1
- SAI2 + RT5616 (SAI as the clock master), FriendlyElec NanoPi M5

NAU8822 didn't work prior to this patch but works after the patch. Other
two configurations work both before and after the patch.

Fixes: cc78d1eaabad ("ASoC: rockchip: add Serial Audio Interface (SAI) driver")
Signed-off-by: Alexey Charkov <alchark at flipper.net>
---
 sound/soc/rockchip/rockchip_sai.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sound/soc/rockchip/rockchip_sai.c b/sound/soc/rockchip/rockchip_sai.c
index 1bf614dbdf4d..ed393e5034a4 100644
--- a/sound/soc/rockchip/rockchip_sai.c
+++ b/sound/soc/rockchip/rockchip_sai.c
@@ -628,6 +628,10 @@ static int rockchip_sai_hw_params(struct snd_pcm_substream *substream,
 
 	regmap_update_bits(sai->regmap, reg, SAI_XCR_VDW_MASK | SAI_XCR_CSR_MASK, val);
 
+	if (!sai->is_tdm)
+		regmap_update_bits(sai->regmap, reg, SAI_XCR_SBW_MASK,
+				   SAI_XCR_SBW(params_physical_width(params)));
+
 	regmap_read(sai->regmap, reg, &val);
 
 	slot_width = SAI_XCR_SBW_V(val);

---
base-commit: 8e5a478b6d6a5bb0a3d52147862b15e4d826af19
change-id: 20260318-sai-slot-width-378eed5c22cd

Best regards,
-- 
Alexey Charkov <alchark at flipper.net>