[src/trunk]: src/sys/dev Improved hw draining. Draining of hw will only comp...

[nat <nat%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/44992d754523
branches:  trunk
changeset: 353425:44992d754523
user:      nat <nat%NetBSD.org@localhost>
date:      Sat May 06 00:13:25 2017 +0000

description:
Improved hw draining.  Draining of hw will only complete if silence has
been played in the mix ring.

Must hold sc_intr_lock when gettin used value of mix ring.

Clearing of the next block to be written to of the mix ring has moved into
audio_mix.

diffstat:

 sys/dev/audio.c    |  34 ++++++++++++++++++++--------------
 sys/dev/audiovar.h |   3 ++-
 2 files changed, 22 insertions(+), 15 deletions(-)

diffs (119 lines):

diff -r df02d07acf2a -r 44992d754523 sys/dev/audio.c
--- a/sys/dev/audio.c   Fri May 05 14:23:47 2017 +0000
+++ b/sys/dev/audio.c   Sat May 06 00:13:25 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: audio.c,v 1.334 2017/05/05 05:46:49 nat Exp $  */
+/*     $NetBSD: audio.c,v 1.335 2017/05/06 00:13:25 nat Exp $  */
 
 /*-
  * Copyright (c) 2016 Nathanial Sloss <nathanialsloss%yahoo.com.au@localhost>
@@ -148,7 +148,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: audio.c,v 1.334 2017/05/05 05:46:49 nat Exp $");
+__KERNEL_RCSID(0, "$NetBSD: audio.c,v 1.335 2017/05/06 00:13:25 nat Exp $");
 
 #include "audio.h"
 #if NAUDIO > 0
@@ -2161,6 +2161,7 @@
                audio_init_ringbuffer(sc, &sc->sc_rr, AUMODE_RECORD);
                sc->schedule_wih = false;
                sc->schedule_rih = false;
+               sc->sc_last_drops = 0;
                sc->sc_eof = 0;
                vc->sc_rbus = false;
                sc->sc_async_audio = 0;
@@ -3607,10 +3608,12 @@
        if (sc->sc_dying == true || sc->sc_trigger_started == false)
                return;
 
-       if (vc->sc_draining == true) {
+       if (vc->sc_draining == true && sc->sc_pr.drops !=
+                                               sc->sc_last_drops) {
                vc->sc_mpr.drops += blksize;
                cv_broadcast(&sc->sc_wchan);
        }
+       sc->sc_last_drops = sc->sc_pr.drops;
 
        vc->sc_mpr.s.outp = audio_stream_add_outp(&vc->sc_mpr.s,
            vc->sc_mpr.s.outp, blksize);
@@ -3646,7 +3649,7 @@
        struct audio_ringbuffer *cb;
        stream_fetcher_t *fetcher;
        uint8_t *inp;
-       int cc, used, blksize;
+       int cc, cc1, used, blksize;
        
        sc = v;
 
@@ -3809,9 +3812,19 @@
        if (sc->sc_writeme == false) {
                DPRINTFN(3, ("MIX RING EMPTY - INSERT SILENCE\n"));
                audio_fill_silence(&vc->sc_mpr.s.param, inp, cc);
+               sc->sc_pr.drops += cc;
        } else
                cc = blksize;
        cb->s.inp = audio_stream_add_inp(&cb->s, cb->s.inp, cc);
+       cc = blksize;
+       cc1 = sc->sc_pr.s.end - sc->sc_pr.s.inp;
+       if (cc1 < cc) {
+               memset(sc->sc_pr.s.inp, 0, cc1);
+               cc -= cc1;
+               memset(sc->sc_pr.s.start, 0, cc);
+       } else
+               memset(sc->sc_pr.s.inp, 0, cc);
+
        mutex_exit(sc->sc_intr_lock);
 
        kpreempt_disable();
@@ -5493,15 +5506,6 @@
        vc->sc_pustream->inp = audio_stream_add_inp(vc->sc_pustream,
            inp, blksize);
 
-       cc = blksize;
-       cc2 = sc->sc_pr.s.end - sc->sc_pr.s.inp;
-       if (cc2 < cc) {
-               memset(sc->sc_pr.s.inp, 0, cc2);
-               cc -= cc2;
-               memset(sc->sc_pr.s.start, 0, cc);
-       } else
-               memset(sc->sc_pr.s.inp, 0, cc);
-
        sc->sc_pr.s.outp = audio_stream_add_outp(&sc->sc_pr.s,
            sc->sc_pr.s.outp, blksize);
 
@@ -5819,13 +5823,15 @@
                        mutex_exit(sc->sc_intr_lock);
                        kthread_exit(0);
                }
-               mutex_exit(sc->sc_intr_lock);
 
                while (audio_stream_get_used(&sc->sc_pr.s) < sc->sc_pr.blksize) {
+                       mutex_exit(sc->sc_intr_lock);
                        mutex_enter(sc->sc_lock);
                        audio_mix(sc);
                        mutex_exit(sc->sc_lock);
+                       mutex_enter(sc->sc_intr_lock);
                }
+               mutex_exit(sc->sc_intr_lock);
        }
 }
 
diff -r df02d07acf2a -r 44992d754523 sys/dev/audiovar.h
--- a/sys/dev/audiovar.h        Fri May 05 14:23:47 2017 +0000
+++ b/sys/dev/audiovar.h        Sat May 06 00:13:25 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: audiovar.h,v 1.53 2017/04/17 22:40:06 nat Exp $        */
+/*     $NetBSD: audiovar.h,v 1.54 2017/05/06 00:13:25 nat Exp $        */
 
 /*-
  * Copyright (c) 2002 The NetBSD Foundation, Inc.
@@ -255,6 +255,7 @@
         *  userland
         */
        struct audio_ringbuffer sc_rr;          /* Record ring */
+       ulong           sc_last_drops;          /* Drops from mix ring */
 
        int             sc_eof;         /* EOF, i.e. zero sized write, counter */
        struct  au_mixer_ports sc_inports, sc_outports;