This is a note to let you know that I've just added the patch titled
ASoC: cs35l56: Fix to ensure ASP1 registers match cache
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
asoc-cs35l56-fix-to-ensure-asp1-registers-match-cach.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 5a2cccb4dd8a9bc756d5d80c0a38f8e70189ace0
Author: Richard Fitzgerald <rf@xxxxxxxxxxxxxxxxxxxxx>
Date: Mon Jan 29 16:27:26 2024 +0000
ASoC: cs35l56: Fix to ensure ASP1 registers match cache
[ Upstream commit 72a77d7631c6e392677c0134343cf5edcd3a4572 ]
Add a dummy SUPPLY widget connected to the ASP that forces the
chip registers to match the regmap cache when the ASP is
powered-up.
On a SoundWire system the ASP is free for use as a chip-to-chip
interconnect. This can be either for the firmware on multiple
CS35L56 to share reference audio; or as a bridge to another
device. If it is a firmware interconnect it is owned by the
firmware and the Linux driver should avoid writing the registers.
However. If it is a bridge then Linux may take over and handle
it as a normal codec-to-codec link.
CS35L56 is designed for SDCA and a generic SDCA driver would
know nothing about these chip-specific registers. So if the
ASP is being used on a SoundWire system the firmware sets up the
ASP registers. This means that we can't assume the default
state of the ASP registers. But we don't know the initial state
that the firmware set them to until after the firmware has been
downloaded and booted, which can take several seconds when
downloading multiple amps.
To avoid blocking probe() for several seconds waiting for the
firmware, the silicon defaults are assumed. This allows the machine
driver to setup the ASP configuration during probe() without being
blocked. If the ASP is hooked up and used, the SUPPLY widget
ensures that the chip registers match what was configured in the
regmap cache.
If the machine driver does not hook up the ASP, it is assumed that
it won't call any functions to configure the ASP DAI. Therefore
the regmap cache will be clean for these registers so a
regcache_sync() will not overwrite the chip registers. If the
DAI is not hooked up, the dummy SUPPLY widget will not be
invoked so it will never force-overwrite the chip registers.
Backport note:
This won't apply cleanly to kernels older than v6.6.
Signed-off-by: Richard Fitzgerald <rf@xxxxxxxxxxxxxxxxxxxxx>
Fixes: e49611252900 ("ASoC: cs35l56: Add driver for Cirrus Logic CS35L56")
Link: https://msgid.link/r/20240129162737.497-8-rf@xxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Stable-dep-of: d344873c4cbd ("ALSA: hda: cs35l56: Fix lifetime of cs_dsp instance")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/include/sound/cs35l56.h b/include/sound/cs35l56.h
index 3950322bf3cbb..4e5f35dc042a1 100644
--- a/include/sound/cs35l56.h
+++ b/include/sound/cs35l56.h
@@ -273,6 +273,7 @@ extern const char * const cs35l56_tx_input_texts[CS35L56_NUM_INPUT_SRC];
extern const unsigned int cs35l56_tx_input_values[CS35L56_NUM_INPUT_SRC];
int cs35l56_set_patch(struct cs35l56_base *cs35l56_base);
+int cs35l56_force_sync_asp1_registers_from_cache(struct cs35l56_base *cs35l56_base);
int cs35l56_mbox_send(struct cs35l56_base *cs35l56_base, unsigned int command);
int cs35l56_firmware_shutdown(struct cs35l56_base *cs35l56_base);
int cs35l56_wait_for_firmware_boot(struct cs35l56_base *cs35l56_base);
diff --git a/sound/soc/codecs/cs35l56-shared.c b/sound/soc/codecs/cs35l56-shared.c
index afd12d853ce4c..12291242362b4 100644
--- a/sound/soc/codecs/cs35l56-shared.c
+++ b/sound/soc/codecs/cs35l56-shared.c
@@ -194,6 +194,47 @@ static bool cs35l56_volatile_reg(struct device *dev, unsigned int reg)
}
}
+/*
+ * The firmware boot sequence can overwrite the ASP1 config registers so that
+ * they don't match regmap's view of their values. Rewrite the values from the
+ * regmap cache into the hardware registers.
+ */
+int cs35l56_force_sync_asp1_registers_from_cache(struct cs35l56_base *cs35l56_base)
+{
+ struct reg_sequence asp1_regs[] = {
+ { .reg = CS35L56_ASP1_ENABLES1 },
+ { .reg = CS35L56_ASP1_CONTROL1 },
+ { .reg = CS35L56_ASP1_CONTROL2 },
+ { .reg = CS35L56_ASP1_CONTROL3 },
+ { .reg = CS35L56_ASP1_FRAME_CONTROL1 },
+ { .reg = CS35L56_ASP1_FRAME_CONTROL5 },
+ { .reg = CS35L56_ASP1_DATA_CONTROL1 },
+ { .reg = CS35L56_ASP1_DATA_CONTROL5 },
+ };
+ int i, ret;
+
+ /* Read values from regmap cache into a write sequence */
+ for (i = 0; i < ARRAY_SIZE(asp1_regs); ++i) {
+ ret = regmap_read(cs35l56_base->regmap, asp1_regs[i].reg, &asp1_regs[i].def);
+ if (ret)
+ goto err;
+ }
+
+ /* Write the values cache-bypassed so that they will be written to silicon */
+ ret = regmap_multi_reg_write_bypassed(cs35l56_base->regmap, asp1_regs,
+ ARRAY_SIZE(asp1_regs));
+ if (ret)
+ goto err;
+
+ return 0;
+
+err:
+ dev_err(cs35l56_base->dev, "Failed to sync ASP1 registers: %d\n", ret);
+
+ return ret;
+}
+EXPORT_SYMBOL_NS_GPL(cs35l56_force_sync_asp1_registers_from_cache, SND_SOC_CS35L56_SHARED);
+
int cs35l56_mbox_send(struct cs35l56_base *cs35l56_base, unsigned int command)
{
unsigned int val;
diff --git a/sound/soc/codecs/cs35l56.c b/sound/soc/codecs/cs35l56.c
index 530f6e06b41d5..c855ef3ec665e 100644
--- a/sound/soc/codecs/cs35l56.c
+++ b/sound/soc/codecs/cs35l56.c
@@ -277,6 +277,21 @@ static SOC_VALUE_ENUM_SINGLE_DECL(cs35l56_sdw1tx4_enum,
static const struct snd_kcontrol_new sdw1_tx4_mux =
SOC_DAPM_ENUM("SDW1TX4 SRC", cs35l56_sdw1tx4_enum);
+static int cs35l56_asp1_cfg_event(struct snd_soc_dapm_widget *w,
+ struct snd_kcontrol *kcontrol, int event)
+{
+ struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
+ struct cs35l56_private *cs35l56 = snd_soc_component_get_drvdata(component);
+
+ switch (event) {
+ case SND_SOC_DAPM_PRE_PMU:
+ /* Override register values set by firmware boot */
+ return cs35l56_force_sync_asp1_registers_from_cache(&cs35l56->base);
+ default:
+ return 0;
+ }
+}
+
static int cs35l56_play_event(struct snd_soc_dapm_widget *w,
struct snd_kcontrol *kcontrol, int event)
{
@@ -313,6 +328,9 @@ static const struct snd_soc_dapm_widget cs35l56_dapm_widgets[] = {
SND_SOC_DAPM_REGULATOR_SUPPLY("VDD_B", 0, 0),
SND_SOC_DAPM_REGULATOR_SUPPLY("VDD_AMP", 0, 0),
+ SND_SOC_DAPM_SUPPLY("ASP1 CFG", SND_SOC_NOPM, 0, 0, cs35l56_asp1_cfg_event,
+ SND_SOC_DAPM_PRE_PMU),
+
SND_SOC_DAPM_SUPPLY("PLAY", SND_SOC_NOPM, 0, 0, cs35l56_play_event,
SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),
@@ -380,6 +398,9 @@ static const struct snd_soc_dapm_route cs35l56_audio_map[] = {
{ "AMP", NULL, "VDD_B" },
{ "AMP", NULL, "VDD_AMP" },
+ { "ASP1 Playback", NULL, "ASP1 CFG" },
+ { "ASP1 Capture", NULL, "ASP1 CFG" },
+
{ "ASP1 Playback", NULL, "PLAY" },
{ "SDW1 Playback", NULL, "PLAY" },
