diff options
Diffstat (limited to 'sound/pci')
| -rw-r--r-- | sound/pci/hda/patch_hdmi.c | 167 |
1 files changed, 166 insertions, 1 deletions
diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c index fd11ad7fe9f4..fc08946e36bb 100644 --- a/sound/pci/hda/patch_hdmi.c +++ b/sound/pci/hda/patch_hdmi.c @@ -2930,6 +2930,171 @@ static int patch_nvhdmi(struct hda_codec *codec) } /* + * The HDA codec on NVIDIA Tegra contains two scratch registers that are + * accessed using vendor-defined verbs. These registers can be used for + * interoperability between the HDA and HDMI drivers. + */ + +/* Audio Function Group node */ +#define NVIDIA_AFG_NID 0x01 + +/* + * The SCRATCH0 register is used to notify the HDMI codec of changes in audio + * format. On Tegra, bit 31 is used as a trigger that causes an interrupt to + * be raised in the HDMI codec. The remainder of the bits is arbitrary. This + * implementation stores the HDA format (see AC_FMT_*) in bits [15:0] and an + * additional bit (at position 30) to signal the validity of the format. + * + * | 31 | 30 | 29 16 | 15 0 | + * +---------+-------+--------+--------+ + * | TRIGGER | VALID | UNUSED | FORMAT | + * +-----------------------------------| + * + * Note that for the trigger bit to take effect it needs to change value + * (i.e. it needs to be toggled). + */ +#define NVIDIA_GET_SCRATCH0 0xfa6 +#define NVIDIA_SET_SCRATCH0_BYTE0 0xfa7 +#define NVIDIA_SET_SCRATCH0_BYTE1 0xfa8 +#define NVIDIA_SET_SCRATCH0_BYTE2 0xfa9 +#define NVIDIA_SET_SCRATCH0_BYTE3 0xfaa +#define NVIDIA_SCRATCH_TRIGGER (1 << 7) +#define NVIDIA_SCRATCH_VALID (1 << 6) + +#define NVIDIA_GET_SCRATCH1 0xfab +#define NVIDIA_SET_SCRATCH1_BYTE0 0xfac +#define NVIDIA_SET_SCRATCH1_BYTE1 0xfad +#define NVIDIA_SET_SCRATCH1_BYTE2 0xfae +#define NVIDIA_SET_SCRATCH1_BYTE3 0xfaf + +/* + * The format parameter is the HDA audio format (see AC_FMT_*). If set to 0, + * the format is invalidated so that the HDMI codec can be disabled. + */ +static void tegra_hdmi_set_format(struct hda_codec *codec, unsigned int format) +{ + unsigned int value; + + /* bits [31:30] contain the trigger and valid bits */ + value = snd_hda_codec_read(codec, NVIDIA_AFG_NID, 0, + NVIDIA_GET_SCRATCH0, 0); + value = (value >> 24) & 0xff; + + /* bits [15:0] are used to store the HDA format */ + snd_hda_codec_write(codec, NVIDIA_AFG_NID, 0, + NVIDIA_SET_SCRATCH0_BYTE0, + (format >> 0) & 0xff); + snd_hda_codec_write(codec, NVIDIA_AFG_NID, 0, + NVIDIA_SET_SCRATCH0_BYTE1, + (format >> 8) & 0xff); + + /* bits [16:24] are unused */ + snd_hda_codec_write(codec, NVIDIA_AFG_NID, 0, + NVIDIA_SET_SCRATCH0_BYTE2, 0); + + /* + * Bit 30 signals that the data is valid and hence that HDMI audio can + * be enabled. + */ + if (format == 0) + value &= ~NVIDIA_SCRATCH_VALID; + else + value |= NVIDIA_SCRATCH_VALID; + + /* + * Whenever the trigger bit is toggled, an interrupt is raised in the + * HDMI codec. The HDMI driver will use that as trigger to update its + * configuration. + */ + value ^= NVIDIA_SCRATCH_TRIGGER; + + snd_hda_codec_write(codec, NVIDIA_AFG_NID, 0, + NVIDIA_SET_SCRATCH0_BYTE3, value); +} + +static int tegra_hdmi_pcm_prepare(struct hda_pcm_stream *hinfo, + struct hda_codec *codec, + unsigned int stream_tag, + unsigned int format, + struct snd_pcm_substream *substream) +{ + int err; + + err = generic_hdmi_playback_pcm_prepare(hinfo, codec, stream_tag, + format, substream); + if (err < 0) + return err; + + /* notify the HDMI codec of the format change */ + tegra_hdmi_set_format(codec, format); + + return 0; +} + +static int tegra_hdmi_pcm_cleanup(struct hda_pcm_stream *hinfo, + struct hda_codec *codec, + struct snd_pcm_substream *substream) +{ + /* invalidate the format in the HDMI codec */ + tegra_hdmi_set_format(codec, 0); + + return generic_hdmi_playback_pcm_cleanup(hinfo, codec, substream); +} + +static struct hda_pcm *hda_find_pcm_by_type(struct hda_codec *codec, int type) +{ + struct hdmi_spec *spec = codec->spec; + unsigned int i; + + for (i = 0; i < spec->num_pins; i++) { + struct hda_pcm *pcm = get_pcm_rec(spec, i); + + if (pcm->pcm_type == type) + return pcm; + } + + return NULL; +} + +static int tegra_hdmi_build_pcms(struct hda_codec *codec) +{ + struct hda_pcm_stream *stream; + struct hda_pcm *pcm; + int err; + + err = generic_hdmi_build_pcms(codec); + if (err < 0) + return err; + + pcm = hda_find_pcm_by_type(codec, HDA_PCM_TYPE_HDMI); + if (!pcm) + return -ENODEV; + + /* + * Override ->prepare() and ->cleanup() operations to notify the HDMI + * codec about format changes. + */ + stream = &pcm->stream[SNDRV_PCM_STREAM_PLAYBACK]; + stream->ops.prepare = tegra_hdmi_pcm_prepare; + stream->ops.cleanup = tegra_hdmi_pcm_cleanup; + + return 0; +} + +static int patch_tegra_hdmi(struct hda_codec *codec) +{ + int err; + + err = patch_generic_hdmi(codec); + if (err) + return err; + + codec->patch_ops.build_pcms = tegra_hdmi_build_pcms; + + return 0; +} + +/* * ATI/AMD-specific implementations */ @@ -3328,7 +3493,7 @@ static const struct hda_codec_preset snd_hda_preset_hdmi[] = { { .id = 0x10de001a, .name = "GPU 1a HDMI/DP", .patch = patch_nvhdmi }, { .id = 0x10de001b, .name = "GPU 1b HDMI/DP", .patch = patch_nvhdmi }, { .id = 0x10de001c, .name = "GPU 1c HDMI/DP", .patch = patch_nvhdmi }, -{ .id = 0x10de0028, .name = "Tegra12x HDMI", .patch = patch_nvhdmi }, +{ .id = 0x10de0028, .name = "Tegra124 HDMI", .patch = patch_tegra_hdmi }, { .id = 0x10de0040, .name = "GPU 40 HDMI/DP", .patch = patch_nvhdmi }, { .id = 0x10de0041, .name = "GPU 41 HDMI/DP", .patch = patch_nvhdmi }, { .id = 0x10de0042, .name = "GPU 42 HDMI/DP", .patch = patch_nvhdmi }, |