ALSA: hda/tegra: get clock handles early in probe

This change “ALSA: hda/tegra: get clock handles early in probe” in Linux kernel is authored by Sameer Pujar <spujar [at] nvidia.com> on Tue Jan 22 13:03:17 2019 +0530.

ALSA: hda/tegra: get clock handles early in probe

Moved devm_clk_get() API calls to a separate function and the same
can be called early in the probe. This is done before runtime PM
for the device is enabled. The runtime resume/suspend callbacks can
later enable/disable clocks respectively(the support would be added
in subsequent patches). Clock handles should be available by the
time runtime suspend/resume calls can happen.

Signed-off-by: Sameer Pujar <spujar@nvidia.com>
Reviewed-by: Ravindra Lokhande <rlokhande@nvidia.com>
Reviewed-by: Mohan Kumar D <mkumard@nvidia.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

This Linux change may have been applied to various maintained Linux releases and you can find Linux releases including commit 65af212.

There are 43 lines of Linux source code added/deleted in this change. Code changes to Linux kernel are as follows.

 sound/pci/hda/hda_tegra.c | 43 +++++++++++++++++++++++++++----------------
 1 file changed, 27 insertions(+), 16 deletions(-)

diff --git a/sound/pci/hda/hda_tegra.c b/sound/pci/hda/hda_tegra.c
index 2f9dd23..28e1656 100644
--- a/sound/pci/hda/hda_tegra.c
+++ b/sound/pci/hda/hda_tegra.c
@@ -306,22 +306,6 @@ static int hda_tegra_init_chip(struct azx *chip, struct platform_device *pdev)
 	struct resource *res;
 	int err;
 
-	hda->hda_clk = devm_clk_get(dev, "hda");
-	if (IS_ERR(hda->hda_clk)) {
-		dev_err(dev, "failed to get hda clockn");
-		return PTR_ERR(hda->hda_clk);
-	}
-	hda->hda2codec_2x_clk = devm_clk_get(dev, "hda2codec_2x");
-	if (IS_ERR(hda->hda2codec_2x_clk)) {
-		dev_err(dev, "failed to get hda2codec_2x clockn");
-		return PTR_ERR(hda->hda2codec_2x_clk);
-	}
-	hda->hda2hdmi_clk = devm_clk_get(dev, "hda2hdmi");
-	if (IS_ERR(hda->hda2hdmi_clk)) {
-		dev_err(dev, "failed to get hda2hdmi clockn");
-		return PTR_ERR(hda->hda2hdmi_clk);
-	}
-
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	hda->regs = devm_ioremap_resource(dev, res);
 	if (IS_ERR(hda->regs))
@@ -341,6 +325,29 @@ static int hda_tegra_init_chip(struct azx *chip, struct platform_device *pdev)
 	return 0;
 }
 
+static int hda_tegra_init_clk(struct hda_tegra *hda)
+{
+	struct device *dev = hda->dev;
+
+	hda->hda_clk = devm_clk_get(dev, "hda");
+	if (IS_ERR(hda->hda_clk)) {
+		dev_err(dev, "failed to get hda clockn");
+		return PTR_ERR(hda->hda_clk);
+	}
+	hda->hda2codec_2x_clk = devm_clk_get(dev, "hda2codec_2x");
+	if (IS_ERR(hda->hda2codec_2x_clk)) {
+		dev_err(dev, "failed to get hda2codec_2x clockn");
+		return PTR_ERR(hda->hda2codec_2x_clk);
+	}
+	hda->hda2hdmi_clk = devm_clk_get(dev, "hda2hdmi");
+	if (IS_ERR(hda->hda2hdmi_clk)) {
+		dev_err(dev, "failed to get hda2hdmi clockn");
+		return PTR_ERR(hda->hda2hdmi_clk);
+	}
+
+	return 0;
+}
+
 static int hda_tegra_first_init(struct azx *chip, struct platform_device *pdev)
 {
 	struct hdac_bus *bus = azx_bus(chip);
@@ -507,6 +514,10 @@ static int hda_tegra_probe(struct platform_device *pdev)
 		return err;
 	}
 
+	err = hda_tegra_init_clk(hda);
+	if (err < 0)
+		goto out_free;
+
 	err = hda_tegra_create(card, driver_flags, hda);
 	if (err < 0)
 		goto out_free;

The commit for this change in Linux stable tree is 65af212 (patch).

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