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Message-Id: <20211202162341.1791-14-digetx@gmail.com>
Date: Thu, 2 Dec 2021 19:23:34 +0300
From: Dmitry Osipenko <digetx@...il.com>
To: Thierry Reding <thierry.reding@...il.com>,
Jonathan Hunter <jonathanh@...dia.com>,
Mark Brown <broonie@...nel.org>, Takashi Iwai <tiwai@...e.com>,
Jaroslav Kysela <perex@...ex.cz>,
Liam Girdwood <lgirdwood@...il.com>,
Agneli <poczt@...tonmail.ch>, Rob Herring <robh+dt@...nel.org>
Cc: linux-tegra@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: [PATCH v3 13/20] ASoC: tegra20: i2s: Filter out unsupported rates
Support new nvidia,fixed-parent-rate device-tree property which instructs
I2S that board wants parent clock rate to stay at a fixed rate. This allows
to play audio over S/PDIF and I2S simultaneously. The root of the problem
is that audio components on Tegra share the same audio PLL, and thus, only
a subset of rates can be supported if we want to play audio simultaneously.
Filter out audio rates that don't match parent clock rate if device-tree
has the nvidia,fixed-parent-rate property.
Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
sound/soc/tegra/tegra20_i2s.c | 49 +++++++++++++++++++++++++++++++++++
1 file changed, 49 insertions(+)
diff --git a/sound/soc/tegra/tegra20_i2s.c b/sound/soc/tegra/tegra20_i2s.c
index 266d2cab9f49..27365a877e47 100644
--- a/sound/soc/tegra/tegra20_i2s.c
+++ b/sound/soc/tegra/tegra20_i2s.c
@@ -262,10 +262,59 @@ static int tegra20_i2s_probe(struct snd_soc_dai *dai)
return 0;
}
+static const unsigned int tegra20_i2s_rates[] = {
+ 8000, 11025, 16000, 22050, 32000, 44100, 48000, 64000, 88200, 96000
+};
+
+static int tegra20_i2s_filter_rates(struct snd_pcm_hw_params *params,
+ struct snd_pcm_hw_rule *rule)
+{
+ struct snd_interval *r = hw_param_interval(params, rule->var);
+ struct snd_soc_dai *dai = rule->private;
+ struct tegra20_i2s *i2s = dev_get_drvdata(dai->dev);
+ struct clk *parent = clk_get_parent(i2s->clk_i2s);
+ long i, parent_rate, valid_rates = 0;
+
+ parent_rate = clk_get_rate(parent);
+ if (parent_rate <= 0) {
+ dev_err(dai->dev, "Can't get parent clock rate: %ld\n",
+ parent_rate);
+ return parent_rate ?: -EINVAL;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(tegra20_i2s_rates); i++) {
+ if (parent_rate % (tegra20_i2s_rates[i] * 128) == 0)
+ valid_rates |= BIT(i);
+ }
+
+ /*
+ * At least one rate must be valid, otherwise the parent clock isn't
+ * audio PLL. Nothing should be filtered in this case.
+ */
+ if (!valid_rates)
+ valid_rates = BIT(ARRAY_SIZE(tegra20_i2s_rates)) - 1;
+
+ return snd_interval_list(r, ARRAY_SIZE(tegra20_i2s_rates),
+ tegra20_i2s_rates, valid_rates);
+}
+
+static int tegra20_i2s_startup(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ if (!device_property_read_bool(dai->dev, "nvidia,fixed-parent-rate"))
+ return 0;
+
+ return snd_pcm_hw_rule_add(substream->runtime, 0,
+ SNDRV_PCM_HW_PARAM_RATE,
+ tegra20_i2s_filter_rates, dai,
+ SNDRV_PCM_HW_PARAM_RATE, -1);
+}
+
static const struct snd_soc_dai_ops tegra20_i2s_dai_ops = {
.set_fmt = tegra20_i2s_set_fmt,
.hw_params = tegra20_i2s_hw_params,
.trigger = tegra20_i2s_trigger,
+ .startup = tegra20_i2s_startup,
};
static const struct snd_soc_dai_driver tegra20_i2s_dai_template = {
--
2.33.1
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