linux-kernel - [PATCH v2 1/3] ASoC: rockchip: i2s: change bclk and lrck according to sample rates

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri,  6 Nov 2015 19:38:14 +0800
From:	Caesar Wang <wxt@...k-chips.com>
To:	Heiko Stuebner <heiko@...ech.de>, Mark Brown <broonie@...nel.org>
Cc:	kmixter@...omium.org, Sonny Rao <sonnyrao@...omium.org>,
	Doug Anderson <dianders@...omium.org>,
	linux-rockchip@...ts.infradead.org,
	Dylan Reid <dgreid@...omium.org>, benchan@...omium.org,
	Cheng-Yi Chiang <cychiang@...omium.org>,
	Caesar Wang <wxt@...k-chips.com>,
	Jaroslav Kysela <perex@...ex.cz>, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org, Takashi Iwai <tiwai@...e.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v2 1/3] ASoC: rockchip: i2s: change bclk and lrck according to sample rates

This patch sets the dividers autonomously.

when i2s works on master mode, and sample rates changed. We need to change
bclk and lrck at the same time for cpu internal side.

As the input source clock to the module is MCLK_I2S,
and by the divider of the module, the clock generator generates
SCLK and LRCK to transmitter and receiver.

Signed-off-by: Caesar Wang <wxt@...k-chips.com>

---

Changes in v2:
- move the set clock divider into rockchip i2s.

 sound/soc/rockchip/rockchip_i2s.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/sound/soc/rockchip/rockchip_i2s.c b/sound/soc/rockchip/rockchip_i2s.c
index b936102..b349935 100644
--- a/sound/soc/rockchip/rockchip_i2s.c
+++ b/sound/soc/rockchip/rockchip_i2s.c
@@ -41,6 +41,7 @@ struct rk_i2s_dev {
 */
 	bool tx_start;
 	bool rx_start;
+	bool is_master_mode;
 };
 
 static int i2s_runtime_suspend(struct device *dev)
@@ -174,9 +175,11 @@ static int rockchip_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
 	case SND_SOC_DAIFMT_CBS_CFS:
 		/* Set source clock in Master mode */
 		val = I2S_CKR_MSS_MASTER;
+		i2s->is_master_mode = true;
 		break;
 	case SND_SOC_DAIFMT_CBM_CFM:
 		val = I2S_CKR_MSS_SLAVE;
+		i2s->is_master_mode = false;
 		break;
 	default:
 		return -EINVAL;
@@ -227,6 +230,26 @@ static int rockchip_i2s_hw_params(struct snd_pcm_substream *substream,
 {
 	struct rk_i2s_dev *i2s = to_info(dai);
 	unsigned int val = 0;
+	unsigned int mclk_rate, bclk_rate, div_bclk, div_lrck;
+
+	if (i2s->is_master_mode) {
+		mclk_rate = clk_get_rate(i2s->mclk);
+		bclk_rate = 2 * 32 * params_rate(params);
+		if (bclk_rate && mclk_rate % bclk_rate)
+			return -EINVAL;
+
+		div_bclk = mclk_rate / bclk_rate;
+		div_lrck = bclk_rate / params_rate(params);
+		regmap_update_bits(i2s->regmap, I2S_CKR,
+				   I2S_CKR_MDIV_MASK,
+				   I2S_CKR_MDIV(div_bclk));
+
+		regmap_update_bits(i2s->regmap, I2S_CKR,
+				   I2S_CKR_TSD_MASK |
+				   I2S_CKR_RSD_MASK,
+				   I2S_CKR_TSD(div_lrck) |
+				   I2S_CKR_RSD(div_lrck));
+	}
 
 	switch (params_format(params)) {
 	case SNDRV_PCM_FORMAT_S8:
-- 
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/