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authorRichard Fitzgerald <rf@opensource.cirrus.com>2023-09-12 19:32:07 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2023-11-28 20:19:42 +0300
commit66a492c7667e5abbd4e21e93b991a523d9735813 (patch)
tree376869754a5bee9075a609c3625c0425fcdc2edf /sound
parente9083128b156209d0d18e26b88adf680d069c60b (diff)
downloadlinux-66a492c7667e5abbd4e21e93b991a523d9735813.tar.xz
ASoC: cs35l56: Use PCI SSID as the firmware UID
[ Upstream commit 1a1c3d794ef65ef2978c5e65e1aed3fe6f014e90 ] If the driver properties do not define a cirrus,firmware-uid try to get the PCI SSID as the UID. On PCI-based systems the PCI SSID is used to uniquely identify the specific sound hardware. This is the standard mechanism for x86 systems and is the way to get a unique system identifier for systems that use the CS35L56 on SoundWire. For non-SoundWire systems there is no Windows equivalent of the ASoC driver in I2C/SPI mode. These would be: 1. HDA systems, which are handled by the HDA subsystem. 2. Linux-specific systems. 3. Composite devices where the cs35l56 is not present in ACPI and is configured using software nodes. Case 2 can use the firmware-uid property, though the PCI SSID is supported as an alternative, as it is the standard PCI mechanism. Case 3 is a SoundWire system where some other codec is the SoundWire bridge device and CS35L56 is not listed in ACPI. As these are SoundWire systems they will normally use the PCI SSID. Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com> Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Link: https://lore.kernel.org/r/20230912163207.3498161-5-rf@opensource.cirrus.com Signed-off-by: Mark Brown <broonie@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'sound')
-rw-r--r--sound/soc/codecs/cs35l56.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/sound/soc/codecs/cs35l56.c b/sound/soc/codecs/cs35l56.c
index f9059780b7a7..32d4ab2cd672 100644
--- a/sound/soc/codecs/cs35l56.c
+++ b/sound/soc/codecs/cs35l56.c
@@ -772,9 +772,20 @@ static int cs35l56_component_probe(struct snd_soc_component *component)
{
struct cs35l56_private *cs35l56 = snd_soc_component_get_drvdata(component);
struct dentry *debugfs_root = component->debugfs_root;
+ unsigned short vendor, device;
BUILD_BUG_ON(ARRAY_SIZE(cs35l56_tx_input_texts) != ARRAY_SIZE(cs35l56_tx_input_values));
+ if (!cs35l56->dsp.system_name &&
+ (snd_soc_card_get_pci_ssid(component->card, &vendor, &device) == 0)) {
+ cs35l56->dsp.system_name = devm_kasprintf(cs35l56->base.dev,
+ GFP_KERNEL,
+ "%04x%04x",
+ vendor, device);
+ if (!cs35l56->dsp.system_name)
+ return -ENOMEM;
+ }
+
if (!wait_for_completion_timeout(&cs35l56->init_completion,
msecs_to_jiffies(5000))) {
dev_err(cs35l56->base.dev, "%s: init_completion timed out\n", __func__);