[alsa-devel] [PATCH 3/5 v2] ASoC: rsnd: call clk_prepare/unprepare() in probe/remove

[Kuninori Morimoto]

From: Kuninori Morimoto <kuninori.morimoto.gx at renesas.com>

clk_prepare_enable()/clk_disable_unprepare() uses mutex inside,
in concretely clk_prepare()/clk_unprepare().And it uses __schedule().
Then, raw_spin_lock/unlock_irq() is called, and it breaks Renesas
sound driver's spin lock irq.
This patch separates thesse into clk_prepare()/clk_unprepare() and
clk_enable/clk_disable. And call clk_prepare()/clk_unprepare() from
probe/remove function. Special thanks to Das Biju.

Reported-by: Das Biju <biju.das at bp.renesas.com>
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx at renesas.com>
---
v1 -> v2

 - separate clk_prepare_enable()/clk_disable_unprepare() into
   clk_prepare()/clk_unprepare() and clk_enable()/clk_disable()

 sound/soc/sh/rcar/core.c | 24 +++++++++++++++++++++++-
 sound/soc/sh/rcar/dvc.c  | 17 +++++++++++++++--
 sound/soc/sh/rcar/rsnd.h | 11 ++++++++---
 sound/soc/sh/rcar/src.c  | 17 +++++++++++++++--
 sound/soc/sh/rcar/ssi.c  | 17 +++++++++++++++--
 5 files changed, 76 insertions(+), 10 deletions(-)

diff --git a/sound/soc/sh/rcar/core.c b/sound/soc/sh/rcar/core.c
index 8d67042..b20e5bd 100644
--- a/sound/soc/sh/rcar/core.c
+++ b/sound/soc/sh/rcar/core.c
@@ -145,16 +145,29 @@ struct dma_chan *rsnd_mod_dma_req(struct rsnd_mod *mod)
 	return mod->ops->dma_req(mod);
 }
 
-void rsnd_mod_init(struct rsnd_mod *mod,
+int rsnd_mod_init(struct rsnd_mod *mod,
 		   struct rsnd_mod_ops *ops,
 		   struct clk *clk,
 		   enum rsnd_mod_type type,
 		   int id)
 {
+	int ret = clk_prepare(clk);
+
+	if (ret)
+		return ret;
+
 	mod->id		= id;
 	mod->ops	= ops;
 	mod->type	= type;
 	mod->clk	= clk;
+
+	return ret;
+}
+
+void rsnd_mod_quit(struct rsnd_mod *mod)
+{
+	if (mod->clk)
+		clk_unprepare(mod->clk);
 }
 
 /*
@@ -1073,6 +1086,12 @@ static int rsnd_remove(struct platform_device *pdev)
 {
 	struct rsnd_priv *priv = dev_get_drvdata(&pdev->dev);
 	struct rsnd_dai *rdai;
+	void (*remove_func[])(struct platform_device *pdev,
+			      struct rsnd_priv *priv) = {
+		rsnd_ssi_remove,
+		rsnd_src_remove,
+		rsnd_dvc_remove,
+	};
 	int ret = 0, i;
 
 	pm_runtime_disable(&pdev->dev);
@@ -1082,6 +1101,9 @@ static int rsnd_remove(struct platform_device *pdev)
 		ret |= rsnd_dai_call(remove, &rdai->capture, priv);
 	}
 
+	for (i = 0; i < ARRAY_SIZE(remove_func); i++)
+		remove_func[i](pdev, priv);
+
 	snd_soc_unregister_component(&pdev->dev);
 	snd_soc_unregister_platform(&pdev->dev);
 
diff --git a/sound/soc/sh/rcar/dvc.c b/sound/soc/sh/rcar/dvc.c
index aeeef13..d8a0837 100644
--- a/sound/soc/sh/rcar/dvc.c
+++ b/sound/soc/sh/rcar/dvc.c
@@ -345,7 +345,7 @@ int rsnd_dvc_probe(struct platform_device *pdev,
 	struct rsnd_dvc *dvc;
 	struct clk *clk;
 	char name[RSND_DVC_NAME_SIZE];
-	int i, nr;
+	int i, nr, ret;
 
 	rsnd_of_parse_dvc(pdev, of_data, priv);
 
@@ -378,11 +378,24 @@ int rsnd_dvc_probe(struct platform_device *pdev,
 
 		dvc->info = &info->dvc_info[i];
 
-		rsnd_mod_init(&dvc->mod, &rsnd_dvc_ops,
+		ret = rsnd_mod_init(&dvc->mod, &rsnd_dvc_ops,
 			      clk, RSND_MOD_DVC, i);
+		if (ret)
+			return ret;
 
 		dev_dbg(dev, "CMD%d probed\n", i);
 	}
 
 	return 0;
 }
+
+void rsnd_dvc_remove(struct platform_device *pdev,
+		     struct rsnd_priv *priv)
+{
+	struct rsnd_dvc *dvc;
+	int i;
+
+	for_each_rsnd_dvc(dvc, priv, i) {
+		rsnd_mod_quit(&dvc->mod);
+	}
+}
diff --git a/sound/soc/sh/rcar/rsnd.h b/sound/soc/sh/rcar/rsnd.h
index 5f35af7..f7af0be 100644
--- a/sound/soc/sh/rcar/rsnd.h
+++ b/sound/soc/sh/rcar/rsnd.h
@@ -285,14 +285,15 @@ struct rsnd_mod {
 #define rsnd_mod_to_dma(mod) (&(mod)->dma)
 #define rsnd_mod_to_io(mod) ((mod)->io)
 #define rsnd_mod_id(mod) ((mod)->id)
-#define rsnd_mod_hw_start(mod)	clk_prepare_enable((mod)->clk)
-#define rsnd_mod_hw_stop(mod)	clk_disable_unprepare((mod)->clk)
+#define rsnd_mod_hw_start(mod)	clk_enable((mod)->clk)
+#define rsnd_mod_hw_stop(mod)	clk_disable((mod)->clk)
 
-void rsnd_mod_init(struct rsnd_mod *mod,
+int rsnd_mod_init(struct rsnd_mod *mod,
 		   struct rsnd_mod_ops *ops,
 		   struct clk *clk,
 		   enum rsnd_mod_type type,
 		   int id);
+void rsnd_mod_quit(struct rsnd_mod *mod);
 char *rsnd_mod_name(struct rsnd_mod *mod);
 struct dma_chan *rsnd_mod_dma_req(struct rsnd_mod *mod);
 
@@ -496,6 +497,8 @@ int rsnd_kctrl_new_e(struct rsnd_mod *mod,
 int rsnd_src_probe(struct platform_device *pdev,
 		   const struct rsnd_of_data *of_data,
 		   struct rsnd_priv *priv);
+void rsnd_src_remove(struct platform_device *pdev,
+		     struct rsnd_priv *priv);
 struct rsnd_mod *rsnd_src_mod_get(struct rsnd_priv *priv, int id);
 unsigned int rsnd_src_get_ssi_rate(struct rsnd_priv *priv,
 				   struct rsnd_dai_stream *io,
@@ -514,6 +517,8 @@ int rsnd_src_ssi_irq_disable(struct rsnd_mod *ssi_mod);
 int rsnd_ssi_probe(struct platform_device *pdev,
 		   const struct rsnd_of_data *of_data,
 		   struct rsnd_priv *priv);
+void rsnd_ssi_remove(struct platform_device *pdev,
+		     struct rsnd_priv *priv);
 struct rsnd_mod *rsnd_ssi_mod_get(struct rsnd_priv *priv, int id);
 int rsnd_ssi_is_pin_sharing(struct rsnd_mod *mod);
 int rsnd_ssi_is_dma_mode(struct rsnd_mod *mod);
diff --git a/sound/soc/sh/rcar/src.c b/sound/soc/sh/rcar/src.c
index cc93f32..6099a8e 100644
--- a/sound/soc/sh/rcar/src.c
+++ b/sound/soc/sh/rcar/src.c
@@ -867,7 +867,7 @@ int rsnd_src_probe(struct platform_device *pdev,
 	struct rsnd_mod_ops *ops;
 	struct clk *clk;
 	char name[RSND_SRC_NAME_SIZE];
-	int i, nr;
+	int i, nr, ret;
 
 	ops = NULL;
 	if (rsnd_is_gen1(priv))
@@ -907,10 +907,23 @@ int rsnd_src_probe(struct platform_device *pdev,
 
 		src->info = &info->src_info[i];
 
-		rsnd_mod_init(&src->mod, ops, clk, RSND_MOD_SRC, i);
+		ret = rsnd_mod_init(&src->mod, ops, clk, RSND_MOD_SRC, i);
+		if (ret)
+			return ret;
 
 		dev_dbg(dev, "SRC%d probed\n", i);
 	}
 
 	return 0;
 }
+
+void rsnd_src_remove(struct platform_device *pdev,
+		     struct rsnd_priv *priv)
+{
+	struct rsnd_src *src;
+	int i;
+
+	for_each_rsnd_src(src, priv, i) {
+		rsnd_mod_quit(&src->mod);
+	}
+}
diff --git a/sound/soc/sh/rcar/ssi.c b/sound/soc/sh/rcar/ssi.c
index 060d3d2..79dc7a3 100644
--- a/sound/soc/sh/rcar/ssi.c
+++ b/sound/soc/sh/rcar/ssi.c
@@ -710,7 +710,7 @@ int rsnd_ssi_probe(struct platform_device *pdev,
 	struct clk *clk;
 	struct rsnd_ssi *ssi;
 	char name[RSND_SSI_NAME_SIZE];
-	int i, nr;
+	int i, nr, ret;
 
 	rsnd_of_parse_ssi(pdev, of_data, priv);
 
@@ -745,10 +745,23 @@ int rsnd_ssi_probe(struct platform_device *pdev,
 		else if (rsnd_ssi_pio_available(ssi))
 			ops = &rsnd_ssi_pio_ops;
 
-		rsnd_mod_init(&ssi->mod, ops, clk, RSND_MOD_SSI, i);
+		ret = rsnd_mod_init(&ssi->mod, ops, clk, RSND_MOD_SSI, i);
+		if (ret)
+			return ret;
 
 		rsnd_ssi_parent_clk_setup(priv, ssi);
 	}
 
 	return 0;
 }
+
+void rsnd_ssi_remove(struct platform_device *pdev,
+		     struct rsnd_priv *priv)
+{
+	struct rsnd_ssi *ssi;
+	int i;
+
+	for_each_rsnd_ssi(ssi, priv, i) {
+		rsnd_mod_quit(&ssi->mod);
+	}
+}
-- 
1.9.1