[alsa-devel] [PATCH 3/3 v2] ASoC: sh: fsi: Add module/port clock control function

[Kuninori Morimoto]

The FIFO of each port were always working though it was not used
in current FSI driver.
This patch add module/port clock control function for fixing it.
This patch is also caring suspend/resume.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx at renesas.com>
---
 sound/soc/sh/fsi.c |   81 ++++++++++++++++++++++++++++++++--------------------
 1 files changed, 50 insertions(+), 31 deletions(-)

diff --git a/sound/soc/sh/fsi.c b/sound/soc/sh/fsi.c
index 1029a03..4a9da6b 100644
--- a/sound/soc/sh/fsi.c
+++ b/sound/soc/sh/fsi.c
@@ -86,8 +86,8 @@
 #define SE	(1 << 0)	/* Fix the master clock */
 
 /* CLK_RST */
-#define B_CLK		0x00000010
-#define A_CLK		0x00000001
+#define CRB	(1 << 4)
+#define CRA	(1 << 0)
 
 /* IO SHIFT / MACRO */
 #define BI_SHIFT	12
@@ -187,6 +187,7 @@ struct fsi_master {
 	u32 saved_iemsk;
 	u32 saved_imsk;
 	u32 saved_clk_rst;
+	u32 saved_soft_rst;
 };
 
 /*
@@ -556,20 +557,45 @@ static void fsi_spdif_clk_ctrl(struct fsi_priv *fsi, int enable)
 }
 
 /*
- *		ctrl function
+ *		clock function
  */
+#define fsi_module_init(m, d)	__fsi_module_clk_ctrl(m, d, 1)
+#define fsi_module_kill(m, d)	__fsi_module_clk_ctrl(m, d, 0)
+static void __fsi_module_clk_ctrl(struct fsi_master *master,
+				  struct device *dev,
+				  int enable)
+{
+	pm_runtime_get_sync(dev);
+
+	if (enable) {
+		/* enable only SR */
+		fsi_master_mask_set(master, SOFT_RST, FSISR, FSISR);
+		fsi_master_mask_set(master, SOFT_RST, PASR | PBSR, 0);
+	} else {
+		/* clear all registers */
+		fsi_master_mask_set(master, SOFT_RST, FSISR, 0);
+	}
+
+	pm_runtime_put_sync(dev);
+}
 
-static void fsi_clk_ctrl(struct fsi_priv *fsi, int enable)
+#define fsi_port_start(f)	__fsi_port_clk_ctrl(f, 1)
+#define fsi_port_stop(f)	__fsi_port_clk_ctrl(f, 0)
+static void __fsi_port_clk_ctrl(struct fsi_priv *fsi, int enable)
 {
-	u32 val = fsi_is_port_a(fsi) ? (1 << 0) : (1 << 4);
 	struct fsi_master *master = fsi_get_master(fsi);
+	u32 soft = fsi_is_port_a(fsi) ? PASR : PBSR;
+	u32 clk  = fsi_is_port_a(fsi) ? CRA  : CRB;
+	int is_master = fsi_is_clk_master(fsi);
 
-	if (enable)
-		fsi_master_mask_set(master, CLK_RST, val, val);
-	else
-		fsi_master_mask_set(master, CLK_RST, val, 0);
+	fsi_master_mask_set(master, SOFT_RST, soft, (enable) ? soft : 0);
+	if (is_master)
+		fsi_master_mask_set(master, CLK_RST, clk, (enable) ? clk : 0);
 }
 
+/*
+ *		ctrl function
+ */
 static void fsi_fifo_init(struct fsi_priv *fsi,
 			  int is_play,
 			  struct snd_soc_dai *dai)
@@ -622,18 +648,6 @@ static void fsi_fifo_init(struct fsi_priv *fsi,
 	}
 }
 
-static void fsi_soft_all_reset(struct fsi_master *master)
-{
-	/* port AB reset */
-	fsi_master_mask_set(master, SOFT_RST, PASR | PBSR, 0);
-	mdelay(10);
-
-	/* soft reset */
-	fsi_master_mask_set(master, SOFT_RST, FSISR, 0);
-	fsi_master_mask_set(master, SOFT_RST, FSISR, FSISR);
-	mdelay(10);
-}
-
 static int fsi_fifo_data_ctrl(struct fsi_priv *fsi, int stream)
 {
 	struct snd_pcm_runtime *runtime;
@@ -818,10 +832,8 @@ static void fsi_dai_shutdown(struct snd_pcm_substream *substream,
 
 	fsi_irq_disable(fsi, is_play);
 
-	if (fsi_is_clk_master(fsi)) {
-		fsi_clk_ctrl(fsi, 0);
+	if (fsi_is_clk_master(fsi))
 		set_rate(dai->dev, fsi_is_port_a(fsi), fsi->rate, 0);
-	}
 
 	fsi->rate = 0;
 
@@ -843,8 +855,10 @@ static int fsi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
 				frames_to_bytes(runtime, runtime->period_size));
 		ret = is_play ? fsi_data_push(fsi) : fsi_data_pop(fsi);
 		fsi_irq_enable(fsi, is_play);
+		fsi_port_start(fsi);
 		break;
 	case SNDRV_PCM_TRIGGER_STOP:
+		fsi_port_stop(fsi);
 		fsi_irq_disable(fsi, is_play);
 		fsi_stream_pop(fsi, is_play);
 		break;
@@ -1018,7 +1032,6 @@ static int fsi_dai_hw_params(struct snd_pcm_substream *substream,
 
 		fsi_reg_mask_set(fsi, CKG1, (ACKMD_MASK | BPFMD_MASK) , data);
 		udelay(10);
-		fsi_clk_ctrl(fsi, 1);
 		ret = 0;
 	}
 
@@ -1233,9 +1246,7 @@ static int fsi_probe(struct platform_device *pdev)
 	pm_runtime_enable(&pdev->dev);
 	dev_set_drvdata(&pdev->dev, master);
 
-	pm_runtime_get_sync(&pdev->dev);
-	fsi_soft_all_reset(master);
-	pm_runtime_put_sync(&pdev->dev);
+	fsi_module_init(master, &pdev->dev);
 
 	ret = request_irq(irq, &fsi_interrupt, IRQF_DISABLED,
 			  id_entry->name, master);
@@ -1279,6 +1290,8 @@ static int fsi_remove(struct platform_device *pdev)
 
 	master = dev_get_drvdata(&pdev->dev);
 
+	fsi_module_kill(master, &pdev->dev);
+
 	free_irq(master->irq, master);
 	pm_runtime_disable(&pdev->dev);
 
@@ -1334,6 +1347,9 @@ static int fsi_suspend(struct device *dev)
 	master->saved_iemsk	= fsi_core_read(master, iemsk);
 	master->saved_imsk	= fsi_core_read(master, imsk);
 	master->saved_clk_rst	= fsi_master_read(master, CLK_RST);
+	master->saved_soft_rst	= fsi_master_read(master, SOFT_RST);
+
+	fsi_module_kill(master, dev);
 
 	pm_runtime_put_sync(dev);
 
@@ -1347,14 +1363,17 @@ static int fsi_resume(struct device *dev)
 
 	pm_runtime_get_sync(dev);
 
-	__fsi_resume(&master->fsia, dev, set_rate);
-	__fsi_resume(&master->fsib, dev, set_rate);
+	fsi_module_init(master, dev);
 
+	fsi_master_mask_set(master, SOFT_RST, 0xffff, master->saved_soft_rst);
+	fsi_master_mask_set(master, CLK_RST, 0xffff, master->saved_clk_rst);
 	fsi_core_mask_set(master, a_mclk, 0xffff, master->saved_a_mclk);
 	fsi_core_mask_set(master, b_mclk, 0xffff, master->saved_b_mclk);
 	fsi_core_mask_set(master, iemsk, 0xffff, master->saved_iemsk);
 	fsi_core_mask_set(master, imsk, 0xffff, master->saved_imsk);
-	fsi_master_mask_set(master, CLK_RST, 0xffff, master->saved_clk_rst);
+
+	__fsi_resume(&master->fsia, dev, set_rate);
+	__fsi_resume(&master->fsib, dev, set_rate);
 
 	pm_runtime_put_sync(dev);
 
-- 
1.7.1