linux-kernel - [PATCH 4.16 084/113] ASoC: dmic: Fix clock parenting

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Message-Id: <20180430184018.745129600@linuxfoundation.org>
Date:   Mon, 30 Apr 2018 12:24:55 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Tero Kristo <t-kristo@...com>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        Mark Brown <broonie@...nel.org>
Subject: [PATCH 4.16 084/113] ASoC: dmic: Fix clock parenting

4.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tero Kristo <t-kristo@...com>

commit 573eda59c772d11fc2b56d525dfb698b0f87ddb3 upstream.

In 4.16 the clock hierarchy got changed by
a5c82a09d876 ARM: dts: omap4: add clkctrl nodes

The fck of dmic is no longer a mux clock, it's parent is.

Signed-off-by: Tero Kristo <t-kristo@...com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
Signed-off-by: Mark Brown <broonie@...nel.org>
Cc: stable@...r.kernel.org # 4.16+
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 sound/soc/omap/omap-dmic.c |   14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

--- a/sound/soc/omap/omap-dmic.c
+++ b/sound/soc/omap/omap-dmic.c
@@ -281,7 +281,7 @@ static int omap_dmic_dai_trigger(struct
 static int omap_dmic_select_fclk(struct omap_dmic *dmic, int clk_id,
 				 unsigned int freq)
 {
-	struct clk *parent_clk;
+	struct clk *parent_clk, *mux;
 	char *parent_clk_name;
 	int ret = 0;
 
@@ -329,14 +329,21 @@ static int omap_dmic_select_fclk(struct
 		return -ENODEV;
 	}
 
+	mux = clk_get_parent(dmic->fclk);
+	if (IS_ERR(mux)) {
+		dev_err(dmic->dev, "can't get fck mux parent\n");
+		clk_put(parent_clk);
+		return -ENODEV;
+	}
+
 	mutex_lock(&dmic->mutex);
 	if (dmic->active) {
 		/* disable clock while reparenting */
 		pm_runtime_put_sync(dmic->dev);
-		ret = clk_set_parent(dmic->fclk, parent_clk);
+		ret = clk_set_parent(mux, parent_clk);
 		pm_runtime_get_sync(dmic->dev);
 	} else {
-		ret = clk_set_parent(dmic->fclk, parent_clk);
+		ret = clk_set_parent(mux, parent_clk);
 	}
 	mutex_unlock(&dmic->mutex);
 
@@ -349,6 +356,7 @@ static int omap_dmic_select_fclk(struct
 	dmic->fclk_freq = freq;
 
 err_busy:
+	clk_put(mux);
 	clk_put(parent_clk);
 
 	return ret;