[PATCH 1/8] hw/audio/es1370: reset current sample counter

Volker Rümelin posted 8 patches 2 months, 3 weeks ago
Maintainers: Gerd Hoffmann <kraxel@redhat.com>
[PATCH 1/8] hw/audio/es1370: reset current sample counter
Posted by Volker Rümelin 2 months, 3 weeks ago
Reset the current sample counter when writing the Channel Sample
Count Register. The Linux ens1370 driver and the AROS sb128
driver expect the current sample counter counts down from sample
count to 0 after a write to the Channel Sample Count Register.
Currently the current sample counter starts from 0 after a reset
or the last count when the counter was stopped.

The current sample counter is used to raise an interrupt whenever
a complete buffer was transferred. When the counter starts with a
value lower than the reload value, the interrupt triggeres before
the buffer was completly transferred. This may lead to corrupted
audio streams.

Tested-by: Rene Engel <ReneEngel80@emailn.de>
Signed-off-by: Volker Rümelin <vr_qemu@t-online.de>
 hw/audio/es1370.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/audio/es1370.c b/hw/audio/es1370.c
index 4f738a0ad8..9a8e29c39c 100644
--- a/hw/audio/es1370.c
+++ b/hw/audio/es1370.c
@@ -502,7 +502,7 @@ static void es1370_write(void *opaque, hwaddr addr, uint64_t val, unsigned size)
     case ES1370_REG_DAC2_SCOUNT:
     case ES1370_REG_ADC_SCOUNT:
         d += (addr - ES1370_REG_DAC1_SCOUNT) >> 2;
-        d->scount = (val & 0xffff) | (d->scount & ~0xffff);
+        d->scount = (val & 0xffff) << 16 | (val & 0xffff);
         ldebug ("chan %td CURR_SAMP_CT %d, SAMP_CT %d\n",
                 d - &s->chan[0], val >> 16, (val & 0xffff));