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hw/display/xlnx_dp: update comments

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Clarify somewhat misleading code comments.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This commit is contained in:
Peter Maydell 2023-08-24 13:26:01 +01:00 • committed by Michael Tokarev
parent 3202d8e404
commit d864cf2592
1 changed files with 6 additions and 3 deletions
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9
hw/display/xlnx_dp.c
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@ -380,13 +380,16 @@ static inline void xlnx_dp_audio_mix_buffer(XlnxDPState *s)
static void xlnx_dp_audio_callback(void *opaque, int avail) static void xlnx_dp_audio_callback(void *opaque, int avail)
{ {
/* /*
* Get some data from the DPDMA and compute these data. * Get the individual left and right audio streams from the DPDMA,
* Then wait for QEMU's audio subsystem to call this callback. * and fill the output buffer with the combined stereo audio data
* adjusted by the volume controls.
* QEMU's audio subsystem will call this callback repeatedly;
* we return the data from the output buffer until it is emptied,
* and then we will read data from the DPDMA again.
*/ */
XlnxDPState *s = XLNX_DP(opaque); XlnxDPState *s = XLNX_DP(opaque);
size_t written = 0; size_t written = 0;
/* If there are already some data don't get more data. */
if (s->byte_left == 0) { if (s->byte_left == 0) {
s->audio_data_available[0] = xlnx_dpdma_start_operation(s->dpdma, 4, s->audio_data_available[0] = xlnx_dpdma_start_operation(s->dpdma, 4,
true); true);