[PATCH 2/6 v2] ARM: mach-shmobile: ap4evb: FSI clock use proper

[PATCH 2/6 v2] ARM: mach-shmobile: ap4evb: FSI clock use proper

[Kuninori Morimoto]

Current AP4 FSI set_rate function used bogus clock process
which didn't care enable/disable and clk->usecound.
To solve this issue, this patch also modify FSI driver to call
set_rate with enough options.
This patch modify it.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
---
v1 -> v2

- modify clock value (0xXXXXX -> rate * 256)
- return 0 -> return ret

 arch/arm/mach-shmobile/board-ap4evb.c |   58 +++++++++++++++++++++++++-------
 arch/arm/mach-shmobile/clock-sh7372.c |    2 +-
 include/sound/sh_fsi.h                |    6 ++-
 sound/soc/sh/fsi.c                    |   19 +++++++++-
 4 files changed, 67 insertions(+), 18 deletions(-)

diff --git a/arch/arm/mach-shmobile/board-ap4evb.c b/arch/arm/mach-shmobile/board-ap4evb.c
index d326054..61c1068 100644
--- a/arch/arm/mach-shmobile/board-ap4evb.c
+++ b/arch/arm/mach-shmobile/board-ap4evb.c
@@ -567,40 +567,72 @@ static struct platform_device *qhd_devices[] __initdata = {
 
 /* FSI */
 #define IRQ_FSI		evt2irq(0x1840)
+static int __fsi_set_rate(struct clk *clk, long rate, int enable)
+{
+	int ret = 0;
+
+	if (rate <= 0)
+		return ret;
 
-static int fsi_set_rate(int is_porta, int rate)
+	if (enable) {
+		ret = clk_set_rate(clk, clk_round_rate(clk, rate));
+		if (0 = ret)
+			ret = clk_enable(clk);
+	} else {
+		clk_disable(clk);
+	}
+
+	return ret;
+}
+
+static int fsi_set_rate(struct device *dev, int is_porta, int rate, int enable)
 {
 	struct clk *fsib_clk;
 	struct clk *fdiv_clk = &sh7372_fsidivb_clk;
+	long fsib_rate = 0;
+	long fdiv_rate = 0;
+	int ackmd_bpfmd;
 	int ret;
 
 	/* set_rate is not needed if port A */
 	if (is_porta)
 		return 0;
 
-	fsib_clk = clk_get(NULL, "fsib_clk");
-	if (IS_ERR(fsib_clk))
-		return -EINVAL;
-
 	switch (rate) {
 	case 44100:
-		clk_set_rate(fsib_clk, clk_round_rate(fsib_clk, 11283000));
-		ret = SH_FSI_ACKMD_256 | SH_FSI_BPFMD_64;
+		fsib_rate	= rate * 256;
+		ackmd_bpfmd	= SH_FSI_ACKMD_256 | SH_FSI_BPFMD_64;
 		break;
 	case 48000:
-		clk_set_rate(fsib_clk, clk_round_rate(fsib_clk, 85428000));
-		clk_set_rate(fdiv_clk, clk_round_rate(fdiv_clk, 12204000));
-		ret = SH_FSI_ACKMD_256 | SH_FSI_BPFMD_64;
+		fsib_rate	= 85428000; /* around 48kHz x 256 x 7 */
+		fdiv_rate	= rate * 256;
+		ackmd_bpfmd	= SH_FSI_ACKMD_256 | SH_FSI_BPFMD_64;
 		break;
 	default:
 		pr_err("unsupported rate in FSI2 port B\n");
-		ret = -EINVAL;
-		break;
+		return -EINVAL;
 	}
 
+	/* FSI B setting */
+	fsib_clk = clk_get(dev, "ickb");
+	if (IS_ERR(fsib_clk))
+		return -EIO;
+
+	ret = __fsi_set_rate(fsib_clk, fsib_rate, enable);
 	clk_put(fsib_clk);
+	if (ret < 0)
+		return ret;
 
-	return ret;
+	/* FSI DIV setting */
+	ret = __fsi_set_rate(fdiv_clk, fdiv_rate, enable);
+	if (ret < 0) {
+		/* disable FSI B */
+		if (enable)
+			__fsi_set_rate(fsib_clk, fsib_rate, 0);
+		return ret;
+	}
+
+	return ackmd_bpfmd;
 }
 
 static struct sh_fsi_platform_info fsi_info = {
diff --git a/arch/arm/mach-shmobile/clock-sh7372.c b/arch/arm/mach-shmobile/clock-sh7372.c
index 1322632..4191e29 100644
--- a/arch/arm/mach-shmobile/clock-sh7372.c
+++ b/arch/arm/mach-shmobile/clock-sh7372.c
@@ -471,7 +471,7 @@ static int fsidiv_set_rate(struct clk *clk,
 		return -ENOENT;
 
 	__raw_writel(idx << 16, clk->mapping->base);
-	return fsidiv_enable(clk);
+	return 0;
 }
 
 static struct clk_ops fsidiv_clk_ops = {
diff --git a/include/sound/sh_fsi.h b/include/sound/sh_fsi.h
index fa60cbd..d798941 100644
--- a/include/sound/sh_fsi.h
+++ b/include/sound/sh_fsi.h
@@ -85,7 +85,9 @@
  *     ACK_MD (FSI2)
  *     CKG1   (FSI)
  *
- * err:  return value < 0
+ * err		: return value <  0
+ * no change	: return value = 0
+ * change xMD	: return value >  0
  *
  * 0x-00000AB
  *
@@ -111,7 +113,7 @@
 struct sh_fsi_platform_info {
 	unsigned long porta_flags;
 	unsigned long portb_flags;
-	int (*set_rate)(int is_porta, int rate); /* for master mode */
+	int (*set_rate)(struct device *dev, int is_porta, int rate, int enable);
 };
 
 #endif /* __SOUND_FSI_H */
diff --git a/sound/soc/sh/fsi.c b/sound/soc/sh/fsi.c
index 507e709..136414f 100644
--- a/sound/soc/sh/fsi.c
+++ b/sound/soc/sh/fsi.c
@@ -132,6 +132,8 @@ struct fsi_priv {
 	struct fsi_stream playback;
 	struct fsi_stream capture;
 
+	long rate;
+
 	u32 mst_ctrl;
 };
 
@@ -854,10 +856,17 @@ static void fsi_dai_shutdown(struct snd_pcm_substream *substream,
 {
 	struct fsi_priv *fsi = fsi_get_priv(substream);
 	int is_play = fsi_is_play(substream);
+	struct fsi_master *master = fsi_get_master(fsi);
+	int (*set_rate)(struct device *dev, int is_porta, int rate, int enable);
 
 	fsi_irq_disable(fsi, is_play);
 	fsi_clk_ctrl(fsi, 0);
 
+	set_rate = master->info->set_rate;
+	if (set_rate && fsi->rate)
+		set_rate(dai->dev, fsi_is_port_a(fsi), fsi->rate, 0);
+	fsi->rate = 0;
+
 	pm_runtime_put_sync(dai->dev);
 }
 
@@ -891,9 +900,10 @@ static int fsi_dai_hw_params(struct snd_pcm_substream *substream,
 {
 	struct fsi_priv *fsi = fsi_get_priv(substream);
 	struct fsi_master *master = fsi_get_master(fsi);
-	int (*set_rate)(int is_porta, int rate) = master->info->set_rate;
+	int (*set_rate)(struct device *dev, int is_porta, int rate, int enable);
 	int fsi_ver = master->core->ver;
 	int is_play = fsi_is_play(substream);
+	long rate = params_rate(params);
 	int ret;
 
 	/* if slave mode, set_rate is not needed */
@@ -901,10 +911,15 @@ static int fsi_dai_hw_params(struct snd_pcm_substream *substream,
 		return 0;
 
 	/* it is error if no set_rate */
+	set_rate = master->info->set_rate;
 	if (!set_rate)
 		return -EIO;
 
-	ret = set_rate(fsi_is_port_a(fsi), params_rate(params));
+	ret = set_rate(dai->dev, fsi_is_port_a(fsi), rate, 1);
+	if (ret < 0) /* error */
+		return ret;
+
+	fsi->rate = rate;
 	if (ret > 0) {
 		u32 data = 0;
 
-- 
1.7.0.4

Re: [PATCH 2/6 v2] ARM: mach-shmobile: ap4evb: FSI clock use

[Mark Brown]

On Wed, Nov 24, 2010 at 11:44:06AM +0900, Kuninori Morimoto wrote:
> Current AP4 FSI set_rate function used bogus clock process
> which didn't care enable/disable and clk->usecound.
> To solve this issue, this patch also modify FSI driver to call
> set_rate with enough options.
> This patch modify it.
> 
> Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>

Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>