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| author |   Takashi Iwai <tiwai@suse.de> | 2019-12-12 20:11:00 +0100 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2019-12-13 14:36:44 +0100 |
| commit | 89698ed5cc76d8de6c2b51d132c06bf4cd930314 (patch) | |
| tree | 2d3217f19152cbeec9fa92f544ca555739e0f7e7 /sound/hda | |
| parent | ALSA: hda: tegra: Fix unused variable compile warning (diff) | |
| download | linux-dev-89698ed5cc76d8de6c2b51d132c06bf4cd930314.tar.xz linux-dev-89698ed5cc76d8de6c2b51d132c06bf4cd930314.zip | |
ALSA: hda: Use waitqueue for RIRB in HDA-core helper, too
This patch implements the same logic that was done for the legacy
HD-audio controller driver by the commit 88452da92ba2 ("ALSA: hda: Use
standard waitqueue for RIRB wakeup") to the HDA-core helper code,
too. This makes snd_hdac_bus_get_response() waiting for the response
with bus->rirb_wq instead of polling when bus->polling is false.
It'll save both CPU time and response latency.
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20191212191101.19517-2-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/hda')
| -rw-r--r-- | sound/hda/hdac_controller.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/sound/hda/hdac_controller.c b/sound/hda/hdac_controller.c index cd1c3b282657..61950b83b8c9 100644 --- a/sound/hda/hdac_controller.c +++ b/sound/hda/hdac_controller.c @@ -241,30 +241,42 @@ int snd_hdac_bus_get_response(struct hdac_bus *bus, unsigned int addr, { unsigned long timeout; unsigned long loopcounter; + wait_queue_entry_t wait; + init_wait_entry(&wait, 0); timeout = jiffies + msecs_to_jiffies(1000); for (loopcounter = 0;; loopcounter++) { spin_lock_irq(&bus->reg_lock); + if (!bus->polling_mode) + prepare_to_wait(&bus->rirb_wq, &wait, + TASK_UNINTERRUPTIBLE); if (bus->polling_mode) snd_hdac_bus_update_rirb(bus); if (!bus->rirb.cmds[addr]) { if (res) *res = bus->rirb.res[addr]; /* the last value */ + if (!bus->polling_mode) + finish_wait(&bus->rirb_wq, &wait); spin_unlock_irq(&bus->reg_lock); return 0; } spin_unlock_irq(&bus->reg_lock); if (time_after(jiffies, timeout)) break; - if (loopcounter > 3000) + if (!bus->polling_mode) { + schedule_timeout(msecs_to_jiffies(2)); + } else if (loopcounter > 3000) { msleep(2); /* temporary workaround */ - else { + } else { udelay(10); cond_resched(); } } + if (!bus->polling_mode) + finish_wait(&bus->rirb_wq, &wait); + return -EIO; } EXPORT_SYMBOL_GPL(snd_hdac_bus_get_response); |