[PATCH 4/5] ASoC: rt5682: DAI wclk supports 44100 Hz output

[derek.fang at realtek.com]

From: "derek.fang" <derek.fang at realtek.com>

DAI Wclk of rt5682 only supports 48000Hz output so far,
this patch lets it support 44100Hz.

Signed-off-by: derek.fang <derek.fang at realtek.com>
---
 sound/soc/codecs/rt5682.c | 49 ++++++++++++++++++++++++++++++-----------------
 1 file changed, 31 insertions(+), 18 deletions(-)

diff --git a/sound/soc/codecs/rt5682.c b/sound/soc/codecs/rt5682.c
index 5959b6a..f9d8d8c 100644
--- a/sound/soc/codecs/rt5682.c
+++ b/sound/soc/codecs/rt5682.c
@@ -2461,8 +2461,8 @@ static int rt5682_set_bias_level(struct snd_soc_component *component,
 
 #ifdef CONFIG_COMMON_CLK
 #define CLK_PLL2_FIN 48000000
-#define CLK_PLL2_FOUT 24576000
 #define CLK_48 48000
+#define CLK_44 44100
 
 static bool rt5682_clk_check(struct rt5682_priv *rt5682)
 {
@@ -2544,13 +2544,22 @@ static unsigned long rt5682_wclk_recalc_rate(struct clk_hw *hw,
 	struct rt5682_priv *rt5682 =
 		container_of(hw, struct rt5682_priv,
 			     dai_clks_hw[RT5682_DAI_WCLK_IDX]);
+	struct snd_soc_component *component = rt5682->component;
+	const char * const clk_name = __clk_get_name(hw->clk);
 
 	if (!rt5682_clk_check(rt5682))
 		return 0;
 	/*
-	 * Only accept to set wclk rate to 48kHz temporarily.
+	 * Only accept to set wclk rate to 44.1k or 48kHz.
 	 */
-	return CLK_48;
+	if (rt5682->lrck[RT5682_AIF1] != CLK_48 &&
+	    rt5682->lrck[RT5682_AIF1] != CLK_44) {
+		dev_warn(component->dev, "%s: clk %s only support %d or %d Hz output\n",
+			__func__, clk_name, CLK_44, CLK_48);
+		return 0;
+	}
+
+	return rt5682->lrck[RT5682_AIF1];
 }
 
 static long rt5682_wclk_round_rate(struct clk_hw *hw, unsigned long rate,
@@ -2559,13 +2568,22 @@ static long rt5682_wclk_round_rate(struct clk_hw *hw, unsigned long rate,
 	struct rt5682_priv *rt5682 =
 		container_of(hw, struct rt5682_priv,
 			     dai_clks_hw[RT5682_DAI_WCLK_IDX]);
+	struct snd_soc_component *component = rt5682->component;
+	const char * const clk_name = __clk_get_name(hw->clk);
 
 	if (!rt5682_clk_check(rt5682))
 		return -EINVAL;
 	/*
-	 * Only accept to set wclk rate to 48kHz temporarily.
+	 * Only accept to set wclk rate to 44.1k or 48kHz.
+	 * It will force to 48kHz if not both.
 	 */
-	return CLK_48;
+	if (rate != CLK_48 && rate != CLK_44) {
+		dev_warn(component->dev, "%s: clk %s only support %d or %d Hz output\n",
+			__func__, clk_name, CLK_44, CLK_48);
+		rate = CLK_48;
+	}
+
+	return rate;
 }
 
 static int rt5682_wclk_set_rate(struct clk_hw *hw, unsigned long rate,
@@ -2578,6 +2596,7 @@ static int rt5682_wclk_set_rate(struct clk_hw *hw, unsigned long rate,
 	struct clk *parent_clk;
 	const char * const clk_name = __clk_get_name(hw->clk);
 	int pre_div;
+	unsigned int clk_pll2_out;
 
 	if (!rt5682_clk_check(rt5682))
 		return -EINVAL;
@@ -2600,23 +2619,17 @@ static int rt5682_wclk_set_rate(struct clk_hw *hw, unsigned long rate,
 			clk_name, CLK_PLL2_FIN);
 
 	/*
-	 * It's a temporary limitation. Only accept to set wclk rate to 48kHz.
-	 * It will force wclk to 48kHz even it's not.
-	 */
-	if (rate != CLK_48) {
-		dev_warn(component->dev, "clk %s only support %d Hz output\n",
-			clk_name, CLK_48);
-		rate = CLK_48;
-	}
-
-	/*
-	 * To achieve the rate conversion from 48MHz to 48kHz, PLL2 is needed.
+	 * To achieve the rate conversion from 48MHz to 44.1k or 48kHz,
+	 * PLL2 is needed.
 	 */
+	clk_pll2_out = rate * 512;
 	rt5682_set_component_pll(component, RT5682_PLL2, RT5682_PLL2_S_MCLK,
-		CLK_PLL2_FIN, CLK_PLL2_FOUT);
+		CLK_PLL2_FIN, clk_pll2_out);
 
 	rt5682_set_component_sysclk(component, RT5682_SCLK_S_PLL2, 0,
-		CLK_PLL2_FOUT, SND_SOC_CLOCK_IN);
+		clk_pll2_out, SND_SOC_CLOCK_IN);
+
+	rt5682->lrck[RT5682_AIF1] = rate;
 
 	pre_div = rl6231_get_clk_info(rt5682->sysclk, rate);
 
-- 
2.7.4