ARM: mach-shmobile: ap4evb: FSI clock use proper process for HDMI

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>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

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 d3260542b943..61c1068198ec 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 13226323e4e0..4191e2921127 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 fa60cbda90a4..d79894192ae3 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 507e709f2807..136414f163e9 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;