target/linux/bcm27xx/patches-5.4/950-0608-drm-vc4-Set-the-b-frame-marker-to-the-match-ALSA-s-d.patch

   1 From 1cf3e20f13378430cd1fc929548bca9f5e517afe Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.com>
   3 Date: Wed, 25 Mar 2020 18:03:42 +0000
   4 Subject: [PATCH] drm/vc4: Set the b-frame marker to the match ALSA's
   5  default.
   6
   7 ALSA's iec958 plugin by default sets the block start preamble
   8 to 8, whilst this driver was programming the hardware to expect
   9 0xF.
  10 Amend the hardware config to match ALSA.
  11
  12 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  13 ---
  14  drivers/gpu/drm/vc4/vc4_hdmi.c | 3 ++-
  15  1 file changed, 2 insertions(+), 1 deletion(-)
  16
  17 --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
  18 +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
  19 @@ -885,10 +885,11 @@ static int vc4_hdmi_audio_hw_params(stru
  20
  21         vc4_hdmi_audio_set_mai_clock(vc4_hdmi);
  22
  23 +       /* The B frame identifier should match the value used by alsa-lib (8) */
  24         audio_packet_config =
  25                 VC4_HDMI_AUDIO_PACKET_ZERO_DATA_ON_SAMPLE_FLAT |
  26                 VC4_HDMI_AUDIO_PACKET_ZERO_DATA_ON_INACTIVE_CHANNELS |
  27 -               VC4_SET_FIELD(0xf, VC4_HDMI_AUDIO_PACKET_B_FRAME_IDENTIFIER);
  28 +               VC4_SET_FIELD(0x8, VC4_HDMI_AUDIO_PACKET_B_FRAME_IDENTIFIER);
  29
  30         channel_mask = GENMASK(vc4_hdmi->audio.channels - 1, 0);
  31         audio_packet_config |= VC4_SET_FIELD(channel_mask,