ALSA: hda: cs35l56: Fix missing RESET GPIO if _SUB is missing

In cs35l56_hda_read_acpi() do not return if ACPI _SUB is missing.

A missing _SUB means that the driver cannot load a system-specific
firmware, because the firmware is identified by the _SUB. But it can
fallback to a generic firmware. Unfortunately this was being handled
by immediately returning 0, which would skip the remaining ACPI
configuration in cs35l56_hda_read_acpi() and so it would not get the
RESET GPIO.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Fixes: 73cfbfa9caea ("ALSA: hda/cs35l56: Add driver for Cirrus Logic CS35L56 amplifier")
Link: https://lore.kernel.org/r/20230914152525.20829-1-rf@opensource.cirrus.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/hda/cs35l56_hda.c b/sound/pci/hda/cs35l56_hda.c
index bc75865b5de873be93725bf0b4388e589c7abf86..87ffe8fbff991f042b862f93deb91659a46777bb 100644 (file)
--- a/sound/pci/hda/cs35l56_hda.c
+++ b/sound/pci/hda/cs35l56_hda.c
@@ -865,15 +865,13 @@ static int cs35l56_hda_read_acpi(struct cs35l56_hda *cs35l56, int id)
        sub = acpi_get_subsystem_id(ACPI_HANDLE(cs35l56->base.dev));
 
        if (IS_ERR(sub)) {
-               /* If no ACPI SUB, return 0 and fallback to legacy firmware path, otherwise fail */
-               if (PTR_ERR(sub) == -ENODATA)
-                       return 0;
-               else
-                       return PTR_ERR(sub);
+               dev_info(cs35l56->base.dev,
+                        "Read ACPI _SUB failed(%ld): fallback to generic firmware\n",
+                        PTR_ERR(sub));
+       } else {
+               cs35l56->system_name = sub;
        }
 
-       cs35l56->system_name = sub;
-
        cs35l56->base.reset_gpio = devm_gpiod_get_index_optional(cs35l56->base.dev,
                                                                 "reset",
                                                                 cs35l56->index,