From: Dom Cobley popcornmix@gmail.com
The hardware uses this for generating the right audio data island packets when using formats other than PCM
Signed-off-by: Dom Cobley popcornmix@gmail.com Signed-off-by: Maxime Ripard maxime@cerno.tech --- drivers/gpu/drm/vc4/vc4_hdmi.c | 48 ++++++++++++++++++++++++++++++++++ drivers/gpu/drm/vc4/vc4_regs.h | 30 +++++++++++++++++++++ 2 files changed, 78 insertions(+)
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c index 212b5df11d73..2c2f21ee0451 100644 --- a/drivers/gpu/drm/vc4/vc4_hdmi.c +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c @@ -1181,6 +1181,44 @@ static void vc4_hdmi_audio_shutdown(struct snd_pcm_substream *substream, vc4_hdmi->audio.substream = NULL; }
+static int sample_rate_to_mai_fmt(int samplerate) +{ + switch (samplerate) { + case 8000: + return VC4_HDMI_MAI_SAMPLE_RATE_8000; + case 11025: + return VC4_HDMI_MAI_SAMPLE_RATE_11025; + case 12000: + return VC4_HDMI_MAI_SAMPLE_RATE_12000; + case 16000: + return VC4_HDMI_MAI_SAMPLE_RATE_16000; + case 22050: + return VC4_HDMI_MAI_SAMPLE_RATE_22050; + case 24000: + return VC4_HDMI_MAI_SAMPLE_RATE_24000; + case 32000: + return VC4_HDMI_MAI_SAMPLE_RATE_32000; + case 44100: + return VC4_HDMI_MAI_SAMPLE_RATE_44100; + case 48000: + return VC4_HDMI_MAI_SAMPLE_RATE_48000; + case 64000: + return VC4_HDMI_MAI_SAMPLE_RATE_64000; + case 88200: + return VC4_HDMI_MAI_SAMPLE_RATE_88200; + case 96000: + return VC4_HDMI_MAI_SAMPLE_RATE_96000; + case 128000: + return VC4_HDMI_MAI_SAMPLE_RATE_128000; + case 176400: + return VC4_HDMI_MAI_SAMPLE_RATE_176400; + case 192000: + return VC4_HDMI_MAI_SAMPLE_RATE_192000; + default: + return VC4_HDMI_MAI_SAMPLE_RATE_NOT_INDICATED; + } +} + /* HDMI audio codec callbacks */ static int vc4_hdmi_audio_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, @@ -1191,6 +1229,8 @@ static int vc4_hdmi_audio_hw_params(struct snd_pcm_substream *substream, struct device *dev = &vc4_hdmi->pdev->dev; u32 audio_packet_config, channel_mask; u32 channel_map; + u32 mai_audio_format; + u32 mai_sample_rate;
if (substream != vc4_hdmi->audio.substream) return -EINVAL; @@ -1211,6 +1251,14 @@ static int vc4_hdmi_audio_hw_params(struct snd_pcm_substream *substream,
vc4_hdmi_audio_set_mai_clock(vc4_hdmi);
+ mai_sample_rate = sample_rate_to_mai_fmt(vc4_hdmi->audio.samplerate); + mai_audio_format = VC4_HDMI_MAI_FORMAT_PCM; + HDMI_WRITE(HDMI_MAI_FMT, + VC4_SET_FIELD(mai_sample_rate, + VC4_HDMI_MAI_FORMAT_SAMPLE_RATE) | + VC4_SET_FIELD(mai_audio_format, + VC4_HDMI_MAI_FORMAT_AUDIO_FORMAT)); + /* The B frame identifier should match the value used by alsa-lib (8) */ audio_packet_config = VC4_HDMI_AUDIO_PACKET_ZERO_DATA_ON_SAMPLE_FLAT | diff --git a/drivers/gpu/drm/vc4/vc4_regs.h b/drivers/gpu/drm/vc4/vc4_regs.h index be2c32a519b3..489f921ef44d 100644 --- a/drivers/gpu/drm/vc4/vc4_regs.h +++ b/drivers/gpu/drm/vc4/vc4_regs.h @@ -516,6 +516,36 @@ # define VC4_HDMI_AUDIO_PACKET_CEA_MASK_MASK VC4_MASK(7, 0) # define VC4_HDMI_AUDIO_PACKET_CEA_MASK_SHIFT 0
+# define VC4_HDMI_MAI_FORMAT_AUDIO_FORMAT_MASK VC4_MASK(23, 16) +# define VC4_HDMI_MAI_FORMAT_AUDIO_FORMAT_SHIFT 16 + +enum { + VC4_HDMI_MAI_FORMAT_PCM = 2, + VC4_HDMI_MAI_FORMAT_HBR = 200, +}; + +# define VC4_HDMI_MAI_FORMAT_SAMPLE_RATE_MASK VC4_MASK(15, 8) +# define VC4_HDMI_MAI_FORMAT_SAMPLE_RATE_SHIFT 8 + +enum { + VC4_HDMI_MAI_SAMPLE_RATE_NOT_INDICATED = 0, + VC4_HDMI_MAI_SAMPLE_RATE_8000 = 1, + VC4_HDMI_MAI_SAMPLE_RATE_11025 = 2, + VC4_HDMI_MAI_SAMPLE_RATE_12000 = 3, + VC4_HDMI_MAI_SAMPLE_RATE_16000 = 4, + VC4_HDMI_MAI_SAMPLE_RATE_22050 = 5, + VC4_HDMI_MAI_SAMPLE_RATE_24000 = 6, + VC4_HDMI_MAI_SAMPLE_RATE_32000 = 7, + VC4_HDMI_MAI_SAMPLE_RATE_44100 = 8, + VC4_HDMI_MAI_SAMPLE_RATE_48000 = 9, + VC4_HDMI_MAI_SAMPLE_RATE_64000 = 10, + VC4_HDMI_MAI_SAMPLE_RATE_88200 = 11, + VC4_HDMI_MAI_SAMPLE_RATE_96000 = 12, + VC4_HDMI_MAI_SAMPLE_RATE_128000 = 13, + VC4_HDMI_MAI_SAMPLE_RATE_176400 = 14, + VC4_HDMI_MAI_SAMPLE_RATE_192000 = 15, +}; + # define VC4_HDMI_RAM_PACKET_ENABLE BIT(16)
/* When set, the CTS_PERIOD counts based on MAI bus sync pulse instead