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From:   Sugar Zhang <sugar.zhang@rock-chips.com>
To:     broonie@kernel.org, heiko@sntech.de
Cc:     linux-rockchip@lists.infradead.org,
        Sugar Zhang <sugar.zhang@rock-chips.com>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Jaroslav Kysela <perex@perex.cz>,
        Takashi Iwai <tiwai@suse.com>, alsa-devel@alsa-project.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: [PATCH v1 01/15] ASoC: rockchip: i2s: Add support for set bclk ratio
Date:   Mon, 23 Aug 2021 18:48:15 +0800
Message-Id: <1629715710-21137-2-git-send-email-sugar.zhang@rock-chips.com>
In-Reply-To: <1629715710-21137-1-git-send-email-sugar.zhang@rock-chips.com>
References: <1629715710-21137-1-git-send-email-sugar.zhang@rock-chips.com>
Precedence: bulk

This patch adds support for set bclk ratio from machine driver.

Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
---

 sound/soc/rockchip/rockchip_i2s.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/sound/soc/rockchip/rockchip_i2s.c b/sound/soc/rockchip/rockchip_i2s.c
index c7dc350..c9d5c52 100644
--- a/sound/soc/rockchip/rockchip_i2s.c
+++ b/sound/soc/rockchip/rockchip_i2s.c
@@ -49,6 +49,7 @@ struct rk_i2s_dev {
 	bool rx_start;
 	bool is_master_mode;
 	const struct rk_i2s_pins *pins;
+	unsigned int bclk_ratio;
 };
 
 static int i2s_runtime_suspend(struct device *dev)
@@ -278,7 +279,7 @@ static int rockchip_i2s_hw_params(struct snd_pcm_substream *substream,
 
 	if (i2s->is_master_mode) {
 		mclk_rate = clk_get_rate(i2s->mclk);
-		bclk_rate = 2 * 32 * params_rate(params);
+		bclk_rate = i2s->bclk_ratio * params_rate(params);
 		if (bclk_rate == 0 || mclk_rate % bclk_rate)
 			return -EINVAL;
 
@@ -413,6 +414,16 @@ static int rockchip_i2s_trigger(struct snd_pcm_substream *substream,
 	return ret;
 }
 
+static int rockchip_i2s_set_bclk_ratio(struct snd_soc_dai *dai,
+				       unsigned int ratio)
+{
+	struct rk_i2s_dev *i2s = to_info(dai);
+
+	i2s->bclk_ratio = ratio;
+
+	return 0;
+}
+
 static int rockchip_i2s_set_sysclk(struct snd_soc_dai *cpu_dai, int clk_id,
 				   unsigned int freq, int dir)
 {
@@ -441,6 +452,7 @@ static int rockchip_i2s_dai_probe(struct snd_soc_dai *dai)
 
 static const struct snd_soc_dai_ops rockchip_i2s_dai_ops = {
 	.hw_params = rockchip_i2s_hw_params,
+	.set_bclk_ratio	= rockchip_i2s_set_bclk_ratio,
 	.set_sysclk = rockchip_i2s_set_sysclk,
 	.set_fmt = rockchip_i2s_set_fmt,
 	.trigger = rockchip_i2s_trigger,
@@ -638,6 +650,8 @@ static int rockchip_i2s_probe(struct platform_device *pdev)
 	i2s->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 	i2s->capture_dma_data.maxburst = 4;
 
+	i2s->bclk_ratio = 64;
+
 	dev_set_drvdata(&pdev->dev, i2s);
 
 	pm_runtime_enable(&pdev->dev);
-- 
2.7.4