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The patches were generated from the RPi repo with the following command: git format-patch v6.6.34..rpi-6.1.y Some patches needed rebasing and, as usual, the applied and reverted, wireless drivers, Github workflows, READMEs and defconfigs patches were removed. Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
133 lines
4.9 KiB
Diff
133 lines
4.9 KiB
Diff
From 18851c5d16707ee628bd771da8822e9402ec7a1a Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.com>
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Date: Wed, 17 Apr 2024 17:20:05 +0100
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Subject: [PATCH 1029/1085] ASoC: bcm: Use power-of-2 bclk_ratios
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The soundcard drivers originally used snd_pcm_format_physical_width,
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but a later commit changed that to snd_pcm_format_width because the
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in-memory sample storage width should not be a factor in determining
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the bclk_ratio. However, the physical width rounds the sample bits up
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to the nearest power of 2, which makes it easier to find integer clock
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divisors.
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Restore the old behaviour, but with an implementation that makes it
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clear what is going on.
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See: https://github.com/raspberrypi/linux/issues/6104
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Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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---
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sound/soc/bcm/allo-boss-dac.c | 3 +++
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sound/soc/bcm/dionaudio_loco.c | 3 +++
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sound/soc/bcm/hifiberry_dacplus.c | 3 +++
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sound/soc/bcm/hifiberry_dacplusadc.c | 3 +++
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sound/soc/bcm/hifiberry_dacplusadcpro.c | 3 +++
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sound/soc/bcm/i-sabre-q2m.c | 5 +++--
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sound/soc/bcm/rpi-cirrus.c | 3 +++
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sound/soc/bcm/rpi-simple-soundcard.c | 5 ++++-
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8 files changed, 25 insertions(+), 3 deletions(-)
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--- a/sound/soc/bcm/allo-boss-dac.c
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+++ b/sound/soc/bcm/allo-boss-dac.c
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@@ -278,6 +278,9 @@ static int snd_allo_boss_hw_params(
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struct snd_soc_component *component = asoc_rtd_to_codec(rtd, 0)->component;
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struct snd_soc_card *card = rtd->card;
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+ /* Using powers of 2 allows for an integer clock divisor */
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+ width = width <= 16 ? 16 : 32;
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+
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/* Mute before changing sample rate */
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snd_allo_boss_gpio_mute(card);
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--- a/sound/soc/bcm/dionaudio_loco.c
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+++ b/sound/soc/bcm/dionaudio_loco.c
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@@ -34,6 +34,9 @@ static int snd_rpi_dionaudio_loco_hw_par
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unsigned int sample_bits =
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snd_pcm_format_width(params_format(params));
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+ /* Using powers of 2 allows for an integer clock divisor */
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+ sample_bits = sample_bits <= 16 ? 16 : 32;
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+
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return snd_soc_dai_set_bclk_ratio(cpu_dai, sample_bits * 2);
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}
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--- a/sound/soc/bcm/hifiberry_dacplus.c
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+++ b/sound/soc/bcm/hifiberry_dacplus.c
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@@ -297,6 +297,9 @@ static int snd_rpi_hifiberry_dacplus_hw_
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int channels = params_channels(params);
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int width = snd_pcm_format_width(params_format(params));
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+ /* Using powers of 2 allows for an integer clock divisor */
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+ width = width <= 16 ? 16 : 32;
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+
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if (snd_rpi_hifiberry_is_dacpro) {
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struct snd_soc_component *component = asoc_rtd_to_codec(rtd, 0)->component;
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--- a/sound/soc/bcm/hifiberry_dacplusadc.c
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+++ b/sound/soc/bcm/hifiberry_dacplusadc.c
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@@ -231,6 +231,9 @@ static int snd_rpi_hifiberry_dacplusadc_
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int channels = params_channels(params);
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int width = snd_pcm_format_width(params_format(params));
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+ /* Using powers of 2 allows for an integer clock divisor */
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+ width = width <= 16 ? 16 : 32;
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+
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if (snd_rpi_hifiberry_is_dacpro) {
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struct snd_soc_component *component = asoc_rtd_to_codec(rtd, 0)->component;
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--- a/sound/soc/bcm/hifiberry_dacplusadcpro.c
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+++ b/sound/soc/bcm/hifiberry_dacplusadcpro.c
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@@ -389,6 +389,9 @@ static int snd_rpi_hifiberry_dacplusadcp
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struct snd_soc_dai_driver *drv = dai->driver;
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const struct snd_soc_dai_ops *ops = drv->ops;
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+ /* Using powers of 2 allows for an integer clock divisor */
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+ width = width <= 16 ? 16 : 32;
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+
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if (snd_rpi_hifiberry_is_dacpro) {
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snd_rpi_hifiberry_dacplusadcpro_set_sclk(dac,
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params_rate(params));
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--- a/sound/soc/bcm/i-sabre-q2m.c
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+++ b/sound/soc/bcm/i-sabre-q2m.c
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@@ -53,8 +53,9 @@ static int snd_rpi_i_sabre_q2m_hw_params
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struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
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int bclk_ratio;
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- bclk_ratio = snd_pcm_format_width(
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- params_format(params)) * params_channels(params);
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+ /* Using powers of 2 allows for an integer clock divisor */
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+ bclk_ratio = (snd_pcm_format_width(params_format(params)) <= 16 ? 16 : 32) *
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+ params_channels(params);
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return snd_soc_dai_set_bclk_ratio(cpu_dai, bclk_ratio);
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}
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--- a/sound/soc/bcm/rpi-cirrus.c
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+++ b/sound/soc/bcm/rpi-cirrus.c
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@@ -708,6 +708,9 @@ static int rpi_cirrus_hw_params(struct s
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unsigned int rate = params_rate(params);
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unsigned int clk_freq = calc_sysclk(rate);
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+ /* Using powers of 2 allows for an integer clock divisor */
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+ width = width <= 16 ? 16 : 32;
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+
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mutex_lock(&priv->lock);
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dev_dbg(card->dev, "hw_params: setting rate to %d\n", rate);
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--- a/sound/soc/bcm/rpi-simple-soundcard.c
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+++ b/sound/soc/bcm/rpi-simple-soundcard.c
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@@ -134,10 +134,13 @@ static int snd_rpi_simple_hw_params(stru
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return 0; // BCLK is configured in .init
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/* The simple drivers just set the bclk_ratio to sample_bits * 2 so
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- * hard-code this for now. More complex drivers could just replace
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+ * hard-code this for now, but sticking to powers of 2 to allow for
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+ * integer clock divisors. More complex drivers could just replace
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* the hw_params routine.
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*/
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sample_bits = snd_pcm_format_width(params_format(params));
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+ sample_bits = sample_bits <= 16 ? 16 : 32;
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+
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return snd_soc_dai_set_bclk_ratio(cpu_dai, sample_bits * 2);
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}
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