drm/vc4: hdmi: Reset audio infoframe on encoder_enable if previously streaming

If the encoder is disabled and re-enabled (eg mode change) all infoframes
are reset, whilst the audio subsystem know nothing about this change.
The driver therefore needs to reinstate the audio infoframe for
itself.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Tested-by: Chanwoo Choi <cw00.choi@samsung.com>
Tested-by: Hoegeun Kwon <hoegeun.kwon@samsung.com>
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Link: https://patchwork.freedesktop.org/patch/msgid/cd579ccc2c9b9d2fce0ebaf32f847cedb0e4a7a2.1599120059.git-series.maxime@cerno.tech

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 53c3b5a..43e5946 100644 (file)
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -308,8 +308,16 @@ static void vc4_hdmi_set_audio_infoframe(struct drm_encoder *encoder)
 
 static void vc4_hdmi_set_infoframes(struct drm_encoder *encoder)
 {
+       struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
+
        vc4_hdmi_set_avi_infoframe(encoder);
        vc4_hdmi_set_spd_infoframe(encoder);
+       /*
+        * If audio was streaming, then we need to reenabled the audio
+        * infoframe here during encoder_enable.
+        */
+       if (vc4_hdmi->audio.streaming)
+               vc4_hdmi_set_audio_infoframe(encoder);
 }
 
 static void vc4_hdmi_encoder_disable(struct drm_encoder *encoder)
@@ -694,6 +702,7 @@ static void vc4_hdmi_audio_reset(struct vc4_hdmi *vc4_hdmi)
        struct device *dev = &vc4_hdmi->pdev->dev;
        int ret;
 
+       vc4_hdmi->audio.streaming = false;
        ret = vc4_hdmi_stop_packet(encoder, HDMI_INFOFRAME_TYPE_AUDIO);
        if (ret)
                dev_err(dev, "Failed to stop audio infoframe: %d\n", ret);
@@ -797,6 +806,7 @@ static int vc4_hdmi_audio_trigger(struct snd_pcm_substream *substream, int cmd,
        switch (cmd) {
        case SNDRV_PCM_TRIGGER_START:
                vc4_hdmi_set_audio_infoframe(encoder);
+               vc4_hdmi->audio.streaming = true;
 
                if (vc4_hdmi->variant->phy_rng_enable)
                        vc4_hdmi->variant->phy_rng_enable(vc4_hdmi);
@@ -815,6 +825,8 @@ static int vc4_hdmi_audio_trigger(struct snd_pcm_substream *substream, int cmd,
                if (vc4_hdmi->variant->phy_rng_disable)
                        vc4_hdmi->variant->phy_rng_disable(vc4_hdmi);
 
+               vc4_hdmi->audio.streaming = false;
+
                break;
        default:
                break;

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.h b/drivers/gpu/drm/vc4/vc4_hdmi.h
index 342f6e0..77d47d1 100644 (file)
--- a/drivers/gpu/drm/vc4/vc4_hdmi.h
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.h
@@ -85,6 +85,8 @@ struct vc4_hdmi_audio {
        int channels;
        struct snd_dmaengine_dai_dma_data dma_data;
        struct snd_pcm_substream *substream;
+
+       bool streaming;
 };
 
 /* General HDMI hardware state. */