From: Stefan Binding sbinding@opensource.cirrus.com

[ Upstream commit e43a93c41982e82c1b703dd7fa9c1d965260fbb3 ]

Fixes audio channel assignment from ACPI using configuration table.

Signed-off-by: Stefan Binding sbinding@opensource.cirrus.com Link: https://patch.msgid.link/20250515162848.405055-3-sbinding@opensource.cirrus.... Signed-off-by: Takashi Iwai tiwai@suse.de Signed-off-by: Sasha Levin sashal@kernel.org ---

**YES** This commit should be backported to stable kernel trees. **Extensive Analysis:** **1. Nature of the Fix:** The commit fixes swapped left/right audio channels for Acer Helios laptops by adding three new entries to the `cs35l41_config_table[]`: - `{ "10251826", 2, EXTERNAL, { CS35L41_LEFT, CS35L41_RIGHT, 0, 0 }, 0, -1, -1, 0, 0, 0 }` - `{ "1025182C", 2, EXTERNAL, { CS35L41_LEFT, CS35L41_RIGHT, 0, 0 }, 0, -1, -1, 0, 0, 0 }` - `{ "10251844", 2, EXTERNAL, { CS35L41_LEFT, CS35L41_RIGHT, 0, 0 }, 0, -1, -1, 0, 0, 0 }` The corresponding model table entries are also added to enable these configurations. **2. Comparison with Historical Similar Commits:** This commit is **very similar to Similar Commit #1 (Status: YES)** which also fixed swapped l/r audio channels for Lenovo ThinkBook laptops. Both commits: - Fix the same fundamental issue: swapped audio channels - Make identical types of changes: correcting channel assignment in configuration tables - Are small, contained fixes affecting only audio configuration data - Target specific laptop models with broken audio channel mapping The primary difference is that Similar Commit #1 modified existing entries by swapping `CS35L41_LEFT` and `CS35L41_RIGHT`, while this commit adds new entries with correct channel assignments. **3. Why This Qualifies for Backporting:** **✅ Fixes Important User-Affecting Bug:** Swapped audio channels are a significant usability issue that directly impacts users' audio experience on affected Acer Helios laptops. **✅ Small and Contained Change:** The fix only adds static configuration data - three new entries in a lookup table. No algorithmic changes or complex logic modifications. **✅ Minimal Risk of Regression:** Adding new entries to a device-specific configuration table cannot break existing functionality for other devices. The changes only affect the three specific Acer laptop models. **✅ No Architectural Changes:** This is purely data- driven configuration, not structural code changes. **✅ Specific Hardware Support:** The SSID values (10251826, 1025182C, 10251844) are vendor- specific identifiers for Acer devices (1025 = Acer vendor ID), ensuring the fix only applies to the intended hardware. **4. Code Analysis Verification:** From examining the current kernel tree at `/home/sasha/linux/sound/pci/hda/cs35l41_hda_property.c`, I confirmed that: - The file exists and contains the same structure as the commit - No "1025" entries currently exist in the configuration table - The pattern matches exactly with other vendor entries (HP: 103C, ASUS: 1043, Lenovo: 17AA) **5. Risk Assessment:** - **Regression Risk: MINIMAL** - Adding device-specific entries cannot affect other hardware - **Side Effects: NONE** - Changes are isolated to specific Acer laptop models - **Complexity: LOW** - Simple data table additions with no logic changes **Conclusion:** This commit perfectly fits the stable tree criteria: it's an important hardware-specific bug fix that affects users, with minimal risk and no architectural changes. The historical precedent (Similar Commit #1 with identical nature receiving YES status) strongly supports backporting this fix.

sound/pci/hda/cs35l41_hda_property.c | 6 ++++++ 1 file changed, 6 insertions(+)

diff --git a/sound/pci/hda/cs35l41_hda_property.c b/sound/pci/hda/cs35l41_hda_property.c index 61d2314834e7b..d8249d997c2a0 100644 --- a/sound/pci/hda/cs35l41_hda_property.c +++ b/sound/pci/hda/cs35l41_hda_property.c @@ -31,6 +31,9 @@ struct cs35l41_config { };

static const struct cs35l41_config cs35l41_config_table[] = { + { "10251826", 2, EXTERNAL, { CS35L41_LEFT, CS35L41_RIGHT, 0, 0 }, 0, -1, -1, 0, 0, 0 }, + { "1025182C", 2, EXTERNAL, { CS35L41_LEFT, CS35L41_RIGHT, 0, 0 }, 0, -1, -1, 0, 0, 0 }, + { "10251844", 2, EXTERNAL, { CS35L41_LEFT, CS35L41_RIGHT, 0, 0 }, 0, -1, -1, 0, 0, 0 }, { "10280B27", 2, INTERNAL, { CS35L41_LEFT, CS35L41_RIGHT, 0, 0 }, 1, 2, 0, 1000, 4500, 24 }, { "10280B28", 2, INTERNAL, { CS35L41_LEFT, CS35L41_RIGHT, 0, 0 }, 1, 2, 0, 1000, 4500, 24 }, { "10280BEB", 2, EXTERNAL, { CS35L41_LEFT, CS35L41_RIGHT, 0, 0 }, 1, -1, 0, 0, 0, 0 }, @@ -452,6 +455,9 @@ struct cs35l41_prop_model { static const struct cs35l41_prop_model cs35l41_prop_model_table[] = { { "CLSA0100", NULL, lenovo_legion_no_acpi }, { "CLSA0101", NULL, lenovo_legion_no_acpi }, + { "CSC3551", "10251826", generic_dsd_config }, + { "CSC3551", "1025182C", generic_dsd_config }, + { "CSC3551", "10251844", generic_dsd_config }, { "CSC3551", "10280B27", generic_dsd_config }, { "CSC3551", "10280B28", generic_dsd_config }, { "CSC3551", "10280BEB", generic_dsd_config },