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Message-Id: <20191107231548.17454-1-michael@walle.cc>
Date: Fri, 8 Nov 2019 00:15:48 +0100
From: Michael Walle <michael@...le.cc>
To: alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Cc: Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>,
Jaroslav Kysela <perex@...ex.cz>,
Takashi Iwai <tiwai@...e.com>, patches@...nsource.cirrus.com,
Michael Walle <michael@...le.cc>
Subject: [PATCH] ASoC: wm8904: configure sysclk/FLL automatically
This adds a new mode WM8904_CLK_AUTO which automatically enables the FLL
if a frequency different than the MCLK is set.
These additions make the codec work with the simple-card driver in
general and especially in systems where the MCLK doesn't match the
requested clock.
Signed-off-by: Michael Walle <michael@...le.cc>
---
Unfortunately, I had to move wm8904_sys_sysclk() below wm8904_set_fll(). So
that makes this patch a bit ugly. The added part is the WM8904_CLK_AUTO
branch.
sound/soc/codecs/wm8904.c | 72 ++++++++++++++++++++++++---------------
sound/soc/codecs/wm8904.h | 1 +
2 files changed, 45 insertions(+), 28 deletions(-)
diff --git a/sound/soc/codecs/wm8904.c b/sound/soc/codecs/wm8904.c
index bcb3c9d5abf0..2dd7addfd1a8 100644
--- a/sound/soc/codecs/wm8904.c
+++ b/sound/soc/codecs/wm8904.c
@@ -1410,34 +1410,6 @@ static int wm8904_hw_params(struct snd_pcm_substream *substream,
return 0;
}
-
-static int wm8904_set_sysclk(struct snd_soc_dai *dai, int clk_id,
- unsigned int freq, int dir)
-{
- struct snd_soc_component *component = dai->component;
- struct wm8904_priv *priv = snd_soc_component_get_drvdata(component);
-
- switch (clk_id) {
- case WM8904_CLK_MCLK:
- priv->sysclk_src = clk_id;
- priv->mclk_rate = freq;
- break;
-
- case WM8904_CLK_FLL:
- priv->sysclk_src = clk_id;
- break;
-
- default:
- return -EINVAL;
- }
-
- dev_dbg(dai->dev, "Clock source is %d at %uHz\n", clk_id, freq);
-
- wm8904_configure_clocking(component);
-
- return 0;
-}
-
static int wm8904_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
{
struct snd_soc_component *component = dai->component;
@@ -1824,6 +1796,50 @@ static int wm8904_set_fll(struct snd_soc_dai *dai, int fll_id, int source,
return 0;
}
+static int wm8904_set_sysclk(struct snd_soc_dai *dai, int clk_id,
+ unsigned int freq, int dir)
+{
+ struct snd_soc_component *component = dai->component;
+ struct wm8904_priv *priv = snd_soc_component_get_drvdata(component);
+ unsigned long mclk_freq;
+ int ret;
+
+ switch (clk_id) {
+ case WM8904_CLK_AUTO:
+ mclk_freq = clk_get_rate(priv->mclk);
+ /* enable FLL if a different sysclk is desired */
+ if (mclk_freq != freq) {
+ priv->sysclk_src = WM8904_CLK_FLL;
+ ret = wm8904_set_fll(dai, WM8904_FLL_MCLK,
+ WM8904_FLL_MCLK,
+ clk_get_rate(priv->mclk), freq);
+ if (ret)
+ return ret;
+ break;
+ }
+ clk_id = WM8904_CLK_MCLK;
+ /* fallthrough */
+
+ case WM8904_CLK_MCLK:
+ priv->sysclk_src = clk_id;
+ priv->mclk_rate = freq;
+ break;
+
+ case WM8904_CLK_FLL:
+ priv->sysclk_src = clk_id;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ dev_dbg(dai->dev, "Clock source is %d at %uHz\n", clk_id, freq);
+
+ wm8904_configure_clocking(component);
+
+ return 0;
+}
+
static int wm8904_digital_mute(struct snd_soc_dai *codec_dai, int mute)
{
struct snd_soc_component *component = codec_dai->component;
diff --git a/sound/soc/codecs/wm8904.h b/sound/soc/codecs/wm8904.h
index c1bca52f9927..de6340446b1f 100644
--- a/sound/soc/codecs/wm8904.h
+++ b/sound/soc/codecs/wm8904.h
@@ -10,6 +10,7 @@
#ifndef _WM8904_H
#define _WM8904_H
+#define WM8904_CLK_AUTO 0
#define WM8904_CLK_MCLK 1
#define WM8904_CLK_FLL 2
--
2.20.1
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