target/linux/bcm27xx/patches-5.4/950-0607-drm-vc4-Reset-audio-infoframe-on-encoder_enable-if-p.patch

   1 From 3e45488069e20b07b83d8cbba88c7fa2b205e559 Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.com>
   3 Date: Wed, 25 Mar 2020 18:01:04 +0000
   4 Subject: [PATCH] drm/vc4: Reset audio infoframe on encoder_enable if
   5  previously streaming
   6
   7 If the encoder is disabled and re-enabled (eg mode change) all infoframes
   8 are reset, whilst the audio subsystem know nothing about this change.
   9 The driver therefore needs to reinstate the audio infoframe for
  10 itself.
  11
  12 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  13 ---
  14  drivers/gpu/drm/vc4/vc4_hdmi.c | 12 ++++++++++++
  15  drivers/gpu/drm/vc4/vc4_hdmi.h |  2 ++
  16  2 files changed, 14 insertions(+)
  17
  18 --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
  19 +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
  20 @@ -344,8 +344,16 @@ static void vc4_hdmi_set_audio_infoframe
  21
  22  static void vc4_hdmi_set_infoframes(struct drm_encoder *encoder)
  23  {
  24 +       struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
  25 +
  26         vc4_hdmi_set_avi_infoframe(encoder);
  27         vc4_hdmi_set_spd_infoframe(encoder);
  28 +       /*
  29 +        * If audio was streaming, then we need to reenabled the audio
  30 +        * infoframe here during encoder_enable.
  31 +        */
  32 +       if (vc4_hdmi->audio.streaming)
  33 +               vc4_hdmi_set_audio_infoframe(encoder);
  34  }
  35
  36  static void vc4_hdmi_encoder_disable(struct drm_encoder *encoder)
  37 @@ -825,6 +833,7 @@ static void vc4_hdmi_audio_reset(struct
  38         struct device *dev = &vc4_hdmi->pdev->dev;
  39         int ret;
  40
  41 +       vc4_hdmi->audio.streaming = false;
  42         ret = vc4_hdmi_stop_packet(encoder, HDMI_INFOFRAME_TYPE_AUDIO);
  43         if (ret)
  44                 dev_err(dev, "Failed to stop audio infoframe: %d\n", ret);
  45 @@ -928,6 +937,7 @@ static int vc4_hdmi_audio_trigger(struct
  46         switch (cmd) {
  47         case SNDRV_PCM_TRIGGER_START:
  48                 vc4_hdmi_set_audio_infoframe(encoder);
  49 +               vc4_hdmi->audio.streaming = true;
  50
  51                 if (vc4_hdmi->variant->phy_rng_enable)
  52                         vc4_hdmi->variant->phy_rng_enable(vc4_hdmi);
  53 @@ -946,6 +956,8 @@ static int vc4_hdmi_audio_trigger(struct
  54                 if (vc4_hdmi->variant->phy_rng_disable)
  55                         vc4_hdmi->variant->phy_rng_disable(vc4_hdmi);
  56
  57 +               vc4_hdmi->audio.streaming = false;
  58 +
  59                 break;
  60         default:
  61                 break;
  62 --- a/drivers/gpu/drm/vc4/vc4_hdmi.h
  63 +++ b/drivers/gpu/drm/vc4/vc4_hdmi.h
  64 @@ -101,6 +101,8 @@ struct vc4_hdmi_audio {
  65         int channels;
  66         struct snd_dmaengine_dai_dma_data dma_data;
  67         struct snd_pcm_substream *substream;
  68 +
  69 +       bool streaming;
  70  };
  71
  72  /* General HDMI hardware state. */