drm/vc4: hdmi: Set HD_CTL_WHOLSMP and HD_CTL_CHALIGN_SET

Symptom is random switching of speakers when using multichannel.

Repeatedly running speakertest -c8 occasionally starts with
channels jumbled. This is fixed with HD_CTL_WHOLSMP.

The other bit looks beneficial and apears harmless in testing so
I'd suggest adding it too.

Documentation says: HD_CTL_WHILSMP_SET
Wait for whole sample. When this bit is set MAI transmit will start
only when there is at least one whole sample available in the fifo.

Documentation says: HD_CTL_CHALIGN_SET
Channel Align When Overflow. This bit is used to realign the audio
channels in case of an overflow.
If this bit is set, after the detection of an overflow, equal
amount of dummy words to the missing words will be written to fifo,
filling up the broken sample and maintaining alignment.

Signed-off-by: Dom Cobley <popcornmix@gmail.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Reviewed-by: Nicolas Saenz Julienne <nsaenz@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210525132354.297468-7-maxime@cerno.tech

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 971c65a4d8235fa5a20bacc9f245b16fdf7466b1..9ab83fc1cfab6c7437f6580df6738fc4390c53c7 100644 (file)
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -1378,7 +1378,9 @@ static int vc4_hdmi_audio_trigger(struct snd_pcm_substream *substream, int cmd,
                HDMI_WRITE(HDMI_MAI_CTL,
                           VC4_SET_FIELD(vc4_hdmi->audio.channels,
                                         VC4_HD_MAI_CTL_CHNUM) |
-                          VC4_HD_MAI_CTL_ENABLE);
+                                        VC4_HD_MAI_CTL_WHOLSMP |
+                                        VC4_HD_MAI_CTL_CHALIGN |
+                                        VC4_HD_MAI_CTL_ENABLE);
                break;
        case SNDRV_PCM_TRIGGER_STOP:
                HDMI_WRITE(HDMI_MAI_CTL,