ALSA: usb-audio: Add quirk_flags module option

This patch adds a new module option, quirk_flags, for allowing user to
try some additional device-specific quirk behavior more easily.
When this option is set to non-zero, it overrides the quirk_flags, and
the specific workaround is applied.

Link: https://lore.kernel.org/r/20210729074404.19728-5-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/usb/card.c b/sound/usb/card.c
index 9535df3..cf8f395 100644 (file)
--- a/sound/usb/card.c
+++ b/sound/usb/card.c
@@ -71,6 +71,7 @@ static bool autoclock = true;
 static char *quirk_alias[SNDRV_CARDS];
 static char *delayed_register[SNDRV_CARDS];
 static bool implicit_fb[SNDRV_CARDS];
+static unsigned int quirk_flags[SNDRV_CARDS];
 
 bool snd_usb_use_vmalloc = true;
 bool snd_usb_skip_validation;
@@ -98,6 +99,8 @@ module_param_array(delayed_register, charp, NULL, 0444);
 MODULE_PARM_DESC(delayed_register, "Quirk for delayed registration, given by id:iface, e.g. 0123abcd:4.");
 module_param_array(implicit_fb, bool, NULL, 0444);
 MODULE_PARM_DESC(implicit_fb, "Apply generic implicit feedback sync mode.");
+module_param_array(quirk_flags, uint, NULL, 0444);
+MODULE_PARM_DESC(quirk_flags, "Driver quirk bit flags.");
 module_param_named(use_vmalloc, snd_usb_use_vmalloc, bool, 0444);
 MODULE_PARM_DESC(use_vmalloc, "Use vmalloc for PCM intermediate buffers (default: yes).");
 module_param_named(skip_validation, snd_usb_skip_validation, bool, 0444);
@@ -631,7 +634,10 @@ static int snd_usb_audio_create(struct usb_interface *intf,
        INIT_LIST_HEAD(&chip->midi_list);
        INIT_LIST_HEAD(&chip->mixer_list);
 
-       snd_usb_init_quirk_flags(chip);
+       if (quirk_flags[idx])
+               chip->quirk_flags = quirk_flags[idx];
+       else
+               snd_usb_init_quirk_flags(chip);
 
        card->private_free = snd_usb_audio_free;