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From: Ben Dooks <ben.dooks@codethink.co.uk>
To: alsa-devel@alsa-project.org
Cc: kuninori.morimoto.gx@renesas.com, broonie@kernel.org,
	lgirdwood@gmail.com, linux-sh@vger.kernel.org,
	magnus.damm@opensource.se, linux-kernel@lists.codethink.co.uk,
	William Towle <william.towle@codethink.co.uk>
Subject: [PATCH] ASoC: rsnd: SSI needs to prepare clocks before enabling
Date: Fri, 28 Mar 2014 12:27:06 +0000	[thread overview]
Message-ID: <1396009626-24699-1-git-send-email-ben.dooks@codethink.co.uk> (raw)

From: William Towle <william.towle@codethink.co.uk>

The rsnd_ssi_hw_{stop|start} functions need to call clk_prepare_enable()
and clk_disable_unprepare(), otherwise the following warning occurs on
attempt to play sound:

WARNING: CPU: 2 PID: 1176 at drivers/clk/clk.c:926 __clk_enable+0x30/0x9c()

due to drivers/clk/clk.c:

    926         if (WARN_ON(clk->prepare_count = 0))
    927                 return -ESHUTDOWN;

Signed-off-by: William Towle <william.towle@codethink.co.uk>
[ben.dooks@codethink.co.uk: add more bug info to report]
Tested-by: Ben Dooks <ben.dooks@codethink.co.uk>
---
 sound/soc/sh/rcar/ssi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sound/soc/sh/rcar/ssi.c b/sound/soc/sh/rcar/ssi.c
index 4b8cf7c..1c07ef7 100644
--- a/sound/soc/sh/rcar/ssi.c
+++ b/sound/soc/sh/rcar/ssi.c
@@ -250,7 +250,7 @@ static void rsnd_ssi_hw_start(struct rsnd_ssi *ssi,
 	u32 cr;
 
 	if (0 = ssi->usrcnt) {
-		clk_enable(ssi->clk);
+		clk_prepare_enable(ssi->clk);
 
 		if (rsnd_rdai_is_clk_master(rdai)) {
 			if (rsnd_ssi_clk_from_parent(ssi))
@@ -309,7 +309,7 @@ static void rsnd_ssi_hw_stop(struct rsnd_ssi *ssi,
 				rsnd_ssi_master_clk_stop(ssi);
 		}
 
-		clk_disable(ssi->clk);
+		clk_disable_unprepare(ssi->clk);
 	}
 
 	dev_dbg(dev, "ssi%d hw stopped\n", rsnd_mod_id(&ssi->mod));
-- 
1.9.0


WARNING: multiple messages have this Message-ID (diff)
From: Ben Dooks <ben.dooks@codethink.co.uk>
To: alsa-devel@alsa-project.org
Cc: kuninori.morimoto.gx@renesas.com, broonie@kernel.org,
	lgirdwood@gmail.com, linux-sh@vger.kernel.org,
	magnus.damm@opensource.se, linux-kernel@lists.codethink.co.uk,
	William Towle <william.towle@codethink.co.uk>
Subject: [PATCH] ASoC: rsnd: SSI needs to prepare clocks before enabling
Date: Fri, 28 Mar 2014 12:27:06 +0000	[thread overview]
Message-ID: <1396009626-24699-1-git-send-email-ben.dooks@codethink.co.uk> (raw)

From: William Towle <william.towle@codethink.co.uk>

The rsnd_ssi_hw_{stop|start} functions need to call clk_prepare_enable()
and clk_disable_unprepare(), otherwise the following warning occurs on
attempt to play sound:

WARNING: CPU: 2 PID: 1176 at drivers/clk/clk.c:926 __clk_enable+0x30/0x9c()

due to drivers/clk/clk.c:

    926         if (WARN_ON(clk->prepare_count == 0))
    927                 return -ESHUTDOWN;

Signed-off-by: William Towle <william.towle@codethink.co.uk>
[ben.dooks@codethink.co.uk: add more bug info to report]
Tested-by: Ben Dooks <ben.dooks@codethink.co.uk>
---
 sound/soc/sh/rcar/ssi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sound/soc/sh/rcar/ssi.c b/sound/soc/sh/rcar/ssi.c
index 4b8cf7c..1c07ef7 100644
--- a/sound/soc/sh/rcar/ssi.c
+++ b/sound/soc/sh/rcar/ssi.c
@@ -250,7 +250,7 @@ static void rsnd_ssi_hw_start(struct rsnd_ssi *ssi,
 	u32 cr;
 
 	if (0 == ssi->usrcnt) {
-		clk_enable(ssi->clk);
+		clk_prepare_enable(ssi->clk);
 
 		if (rsnd_rdai_is_clk_master(rdai)) {
 			if (rsnd_ssi_clk_from_parent(ssi))
@@ -309,7 +309,7 @@ static void rsnd_ssi_hw_stop(struct rsnd_ssi *ssi,
 				rsnd_ssi_master_clk_stop(ssi);
 		}
 
-		clk_disable(ssi->clk);
+		clk_disable_unprepare(ssi->clk);
 	}
 
 	dev_dbg(dev, "ssi%d hw stopped\n", rsnd_mod_id(&ssi->mod));
-- 
1.9.0


             reply	other threads:[~2014-03-28 12:27 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-03-28 12:27 Ben Dooks [this message]
2014-03-28 12:27 ` [PATCH] ASoC: rsnd: SSI needs to prepare clocks before enabling Ben Dooks
2014-03-29 10:09 ` Mark Brown
2014-04-04 11:42   ` [alsa-devel] " Ben Dooks
2014-04-04 11:42     ` Ben Dooks

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