diff options
Diffstat (limited to 'pkgs/kpatches/dragonfly/0001-ALSA-usb-audio-Add-a-volume-scale-quirk-for-AudioQue.patch')
| -rw-r--r-- | pkgs/kpatches/dragonfly/0001-ALSA-usb-audio-Add-a-volume-scale-quirk-for-AudioQue.patch | 95 |
1 files changed, 0 insertions, 95 deletions
diff --git a/pkgs/kpatches/dragonfly/0001-ALSA-usb-audio-Add-a-volume-scale-quirk-for-AudioQue.patch b/pkgs/kpatches/dragonfly/0001-ALSA-usb-audio-Add-a-volume-scale-quirk-for-AudioQue.patch deleted file mode 100644 index e04df9ed..00000000 --- a/pkgs/kpatches/dragonfly/0001-ALSA-usb-audio-Add-a-volume-scale-quirk-for-AudioQue.patch +++ /dev/null @@ -1,95 +0,0 @@ -From 8ccfffa0584532d9a98646bc39ead0e2361a86a2 Mon Sep 17 00:00:00 2001 -From: Anssi Hannula <anssi.hannula@iki.fi> -Date: Sun, 16 Aug 2015 15:50:12 +0300 -Subject: [PATCH 1/3] ALSA: usb-audio: Add a volume scale quirk for AudioQuest - DragonFly - -AudioQuest DragonFly DAC reports a volume control range of 0..50 -(0x0000..0x0032) which in USB Audio means a range of 0 .. 0.2dB, which -is obviously incorrect and causes software using the dB information in -e.g. volume sliders to have a massive volume difference in 100..102% -range. - -The actual volume mapping seems to be neither linear volume nor linear -dB scale, but instead quite close to the cubic mapping e.g. alsamixer -uses, with a range of -53...0 dB. - -Add a quirk for DragonFly to use a custom dB mapping, based on my -measurements, using a 10-item range TLV (so it still fits in alsa-lib -MAX_TLV_RANGE_SIZE). - -Tested on AudioQuest DragonFly HW v1.2. The quirk is only applied if the -range is 0..50, so if this gets fixed/changed in later HW revisions it -will no longer be applied. - -Signed-off-by: Anssi Hannula <anssi.hannula@iki.fi> -Cc: <stable@vger.kernel.org> ---- - sound/usb/mixer_quirks.c | 37 +++++++++++++++++++++++++++++++++++++ - 1 file changed, 37 insertions(+) - -diff --git a/sound/usb/mixer_quirks.c b/sound/usb/mixer_quirks.c -index d3608c0..dee73fa 100644 ---- a/sound/usb/mixer_quirks.c -+++ b/sound/usb/mixer_quirks.c -@@ -37,6 +37,7 @@ - #include <sound/control.h> - #include <sound/hwdep.h> - #include <sound/info.h> -+#include <sound/tlv.h> - - #include "usbaudio.h" - #include "mixer.h" -@@ -1715,6 +1716,38 @@ static int snd_microii_controls_create(struct usb_mixer_interface *mixer) - return 0; - } - -+static void snd_dragonfly_quirk_db_scale(struct usb_mixer_interface *mixer) -+{ -+ struct usb_mixer_elem_list *list; -+ struct usb_mixer_elem_info *cval; -+ static const int unit_id = 7; -+ -+ /* approximation using 10 ranges based on output measurement on hw v1.2 */ -+ static const DECLARE_TLV_DB_RANGE(scale, -+ 0, 1, TLV_DB_MINMAX_ITEM(-5300, -4970), -+ 2, 5, TLV_DB_MINMAX_ITEM(-4710, -4160), -+ 6, 7, TLV_DB_MINMAX_ITEM(-3884, -3710), -+ 8, 14, TLV_DB_MINMAX_ITEM(-3443, -2560), -+ 15, 16, TLV_DB_MINMAX_ITEM(-2475, -2324), -+ 17, 19, TLV_DB_MINMAX_ITEM(-2228, -2031), -+ 20, 26, TLV_DB_MINMAX_ITEM(-1910, -1393), -+ 27, 31, TLV_DB_MINMAX_ITEM(-1322, -1032), -+ 32, 40, TLV_DB_MINMAX_ITEM(-968, -490), -+ 41, 50, TLV_DB_MINMAX_ITEM(-441, 0), -+ ); -+ -+ for (list = mixer->id_elems[unit_id]; list; list = list->next_id_elem) { -+ cval = (struct usb_mixer_elem_info *)list; -+ if (cval->control == UAC_FU_VOLUME && -+ cval->min == 0 && cval->max == 50) { -+ usb_audio_info(mixer->chip, "applying DragonFly dB scale quirk\n"); -+ list->kctl->tlv.p = scale; -+ list->kctl->vd[0].access |= SNDRV_CTL_ELEM_ACCESS_TLV_READ; -+ list->kctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK; -+ } -+ } -+} -+ - int snd_usb_mixer_apply_create_quirk(struct usb_mixer_interface *mixer) - { - int err = 0; -@@ -1792,6 +1825,10 @@ int snd_usb_mixer_apply_create_quirk(struct usb_mixer_interface *mixer) - case USB_ID(0x1235, 0x800c): /* Focusrite Scarlett 18i20 */ - err = snd_scarlett_controls_create(mixer); - break; -+ -+ case USB_ID(0x21b4, 0x0081): /* AudioQuest DragonFly */ -+ snd_dragonfly_quirk_db_scale(mixer); -+ break; - } - - return err; --- -2.5.3 - |