[PATCH 14/15] ALSA: usb-audio: Add quirk_flags module option

[Takashi Iwai]

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.

Signed-off-by: Takashi Iwai <tiwai at suse.de>
---
 sound/usb/card.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/sound/usb/card.c b/sound/usb/card.c
index 9535df39c02f..cf8f3953f78f 100644
--- 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;
 
-- 
2.26.2