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([183.91.15.56]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-36a238da3e1sm7521881eec.8.2026.10.28.03.41.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 28 Oct 2026 03:42:01 -0700 (PDT) From: phucduc.bui@gmail.com To: Binbin Zhou , Binbin Zhou , Mark Brown Cc: Liam Girdwood , Jaroslav Kysela , Takashi Iwai , Yingkun Meng , linux-sound@vger.kernel.org, linux-kernel@vger.kernel.org, bui duc phuc Subject: [PATCH v2 1/3] ASoC: loongson: Fix IISConfig0 update in hw_params for rev 1 Date: Wed, 28 Oct 2026 17:41:36 +0700 Message-ID: <20261028104138.26973-2-phucduc.bui@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261028104138.26973-1-phucduc.bui@gmail.com> References: <20261028104138.26973-1-phucduc.bui@gmail.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: bui duc phuc On revision 1 controllers, loongson_i2s_hw_params() reads LS_I2S_CFG and ORs the new LR_LEN, BCLK_RATIO and RES_DEPTH values into it without clearing the old ones. The first stream after boot is configured correctly, but any later stream with a different rate or sample width ends up with a mix of old and new bits, so it may run with the wrong rate or sample width. Use regmap_update_bits() to replace LR_LEN, BCLK_RATIO and the RES_DEPTH field for the current direction while preserving the other direction's RES_DEPTH field. Fixes: d84881e06836 ("ASoC: Add support for Loongson I2S controller") Signed-off-by: bui duc phuc --- Changes in v2: - Use FIELD_PREP() for register fields as suggested by Binbin. sound/soc/loongson/loongson_i2s.c | 21 +++++++++++++-------- sound/soc/loongson/loongson_i2s.h | 6 ++++++ 2 files changed, 19 insertions(+), 8 deletions(-) diff --git a/sound/soc/loongson/loongson_i2s.c b/sound/soc/loongson/loongson_i2s.c index da0d029c028a..aebea177e7e0 100644 --- a/sound/soc/loongson/loongson_i2s.c +++ b/sound/soc/loongson/loongson_i2s.c @@ -6,6 +6,7 @@ // Author: Yingkun Meng // +#include #include #include #include @@ -69,6 +70,7 @@ static int loongson_i2s_hw_params(struct snd_pcm_substream *substream, u32 fs = params_rate(params); u32 bclk_ratio, mclk_ratio; u32 mclk_ratio_frac; + u32 mask; u32 val = 0; switch (i2s->rev_id) { @@ -92,14 +94,17 @@ static int loongson_i2s_hw_params(struct snd_pcm_substream *substream, mclk_ratio_frac = DIV_ROUND_CLOSEST_ULL(((u64)clk_rate << 16), sysclk) - (mclk_ratio << 16); - regmap_read(i2s->regmap, LS_I2S_CFG, &val); - val |= (bits << 24); - val |= (bclk_ratio << 8); - if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) - val |= (bits << 16); - else - val |= bits; - regmap_write(i2s->regmap, LS_I2S_CFG, val); + mask = LS_I2S_CFG_LR_LEN_MASK | LS_I2S_CFG_BCLK_RATIO_MASK; + val = FIELD_PREP(LS_I2S_CFG_LR_LEN_MASK, bits) | + FIELD_PREP(LS_I2S_CFG_BCLK_RATIO_MASK, bclk_ratio); + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { + mask |= LS_I2S_CFG_TX_RES_DEPTH_MASK; + val |= FIELD_PREP(LS_I2S_CFG_TX_RES_DEPTH_MASK, bits); + } else { + mask |= LS_I2S_CFG_RX_RES_DEPTH_MASK; + val |= FIELD_PREP(LS_I2S_CFG_RX_RES_DEPTH_MASK, bits); + } + regmap_update_bits(i2s->regmap, LS_I2S_CFG, mask, val); val = (mclk_ratio_frac << 16) | mclk_ratio; regmap_write(i2s->regmap, LS_I2S_CFG1, val); diff --git a/sound/soc/loongson/loongson_i2s.h b/sound/soc/loongson/loongson_i2s.h index 8b4603c876c5..457d90e3d5b6 100644 --- a/sound/soc/loongson/loongson_i2s.h +++ b/sound/soc/loongson/loongson_i2s.h @@ -40,6 +40,12 @@ #define I2S_CTRL_RX_INT_EN BIT(1) /* RX interrupt enable */ #define I2S_CTRL_TX_INT_EN BIT(0) /* TX interrupt enable */ +/* Loongson I2S Config Register */ +#define LS_I2S_CFG_LR_LEN_MASK GENMASK(31, 24) +#define LS_I2S_CFG_TX_RES_DEPTH_MASK GENMASK(23, 16) +#define LS_I2S_CFG_BCLK_RATIO_MASK GENMASK(15, 8) +#define LS_I2S_CFG_RX_RES_DEPTH_MASK GENMASK(7, 0) /* rev 1 */ + #define LS_I2S_DRVNAME "loongson-i2s" struct loongson_idma_data { -- 2.43.0