linux/sound
Takashi Iwai bc4e94aa8e ALSA: usb-audio: Handle discrete rates properly in hw constraints
In the current code, when the device provides the discrete sample rate
tables with unusual sample rates, the driver tries to gather the whole
values from the audioformat entries and create a hw-constraint rule to
restrict with this single rate list.  This is rather inefficient and
may overlook the rates that are associated only with the certain
audioformat entries.

This patch improves the hw constraint setup by rewriting the existing
hw_rule_rate().  The discrete sample rates (identified by rate_table
and nr_rates of format entry) are checked in the existing
hw_rule_rate() instead of extra rules; in the case of discrete rates,
the function compares with each rate table entry and calculates the
min/max values from there.  For the contiguous rates, the behavior
doesn't change.

Along with it, snd_usb_pcm_check_knot() and snb_usb_substream
rate_list field become superfluous, thus those are dropped.

Tested-by: Keith Milner <kamilner@superlative.org>
Tested-by: Dylan Robinson <dylan_robinson@motu.com>
Link: https://lore.kernel.org/r/20201123085347.19667-2-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2020-11-23 15:11:02 +01:00
..
ac97 ALSA: ac97: (cosmetic) align argument names 2020-09-03 09:27:27 +02:00
aoa ALSA: aoa: i2sbus: use DECLARE_COMPLETION_ONSTACK() macro 2020-09-03 09:26:52 +02:00
arm
atmel ALSA: atmel: ac97: clarify operator precedence 2020-09-03 09:27:34 +02:00
core ALSA: ctl: fix error path at adding user-defined element set 2020-11-13 11:33:55 +01:00
drivers ALSA: portman2x4: fix repeated word 'if' 2020-10-06 18:08:19 +02:00
firewire ALSA: firewire: Clean up a locking issue in copy_resp_to_buf() 2020-11-13 18:37:22 +01:00
hda ALSA: hda: prevent undefined shift in snd_hdac_ext_bus_get_link() 2020-11-03 14:11:38 +01:00
i2c
isa sound fixes for 5.9-rc2 2020-08-21 10:07:54 -07:00
mips hal2: convert to dma_alloc_noncoherent 2020-09-25 06:20:44 +02:00
oss ALSA: Use fallthrough pseudo-keyword 2020-07-09 13:01:29 +02:00
parisc
pci ALSA: mixart: Fix mutex deadlock 2020-11-19 18:26:30 +01:00
pcmcia ALSA: Use fallthrough pseudo-keyword 2020-07-09 13:01:29 +02:00
ppc treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
sh
soc ASoC: Fixes for v5.11 2020-11-19 19:56:29 +01:00
sparc ALSA: sparc: dbri: fix repeated word 'the' 2020-10-17 09:58:35 +02:00
spi
synth
usb ALSA: usb-audio: Handle discrete rates properly in hw constraints 2020-11-23 15:11:02 +01:00
x86 ALSA: hda: use consistent HDAudio spelling in comments/docs 2020-09-02 19:31:32 +02:00
xen ALSA: xen: Remove superfluous fall through comments 2020-07-09 19:10:37 +02:00
ac97_bus.c
Kconfig
last.c
Makefile
sound_core.c