[PULL 2/3] display: xlnx_dp: Provide sufficient bytes for silent audio channel

[Gerd Hoffmann <kraxel@redhat.com>]

From: Sai Pavan Boddu <sai.pavan.boddu@xilinx.com>

Fill the audio channel with required number of bytes to cover the
elapsed time. This prevents rate control reset, and avoids debug prints
like below

log:
	Resetting rate control (65692 samples)
	...
	Resetting rate control (65721 samples)
	...

Signed-off-by: Sai Pavan Boddu <sai.pavan.boddu@xilinx.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 1573833408-2388-1-git-send-email-sai.pavan.boddu@xilinx.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/display/xlnx_dp.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/hw/display/xlnx_dp.c b/hw/display/xlnx_dp.c
index fde3b21ea5f4..705844379794 100644
--- a/hw/display/xlnx_dp.c
+++ b/hw/display/xlnx_dp.c
@@ -394,13 +394,18 @@ static void xlnx_dp_audio_callback(void *opaque, int avail)
             written = AUD_write(s->amixer_output_stream,
                                 &s->out_buffer[s->data_ptr], s->byte_left);
         } else {
+             int len_to_copy;
             /*
              * There is nothing to play.. We don't have any data! Fill the
              * buffer with zero's and send it.
              */
             written = 0;
-            memset(s->out_buffer, 0, 1024);
-            AUD_write(s->amixer_output_stream, s->out_buffer, 1024);
+            while (avail) {
+                len_to_copy = MIN(AUD_CHBUF_MAX_DEPTH, avail);
+                memset(s->out_buffer, 0, len_to_copy);
+                avail -= AUD_write(s->amixer_output_stream, s->out_buffer,
+                                   len_to_copy);
+            }
         }
     } else {
         written = AUD_write(s->amixer_output_stream,
-- 
2.18.1