[Intel-gfx] [PATCH 2/7] drm/i915/sdvo: Implement proper HDMI audio support for SDVO
Ville Syrjälä
ville.syrjala at linux.intel.com
Tue Apr 9 20:00:10 UTC 2019
On Tue, Apr 09, 2019 at 05:40:49PM +0300, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
>
> Our SDVO audio support is pretty bogus. We can't push audio over the
> SDVO bus, so trying to enable audio in the SDVO control register doesn't
> do anything. In fact it looks like the SDVO encoder will always mix in
> the audio coming over HDA, and there's no (at least documented) way to
> disable that from our side. So HDMI audio does work currently but only by
> luck really. What is missing though is the ELD.
Hmm. Looks like I forgot to update this text after the gen3 bug was
reported. The situation is that audio works on gen4 by luck. On gen3
it got broken by the referenced commit since we no longer enable
HDMI encoding on the SDVO device (that will stop audio transmission
entirely).
>
> To pass the ELD to the audio driver we need to write it to magic buffer
> in the SDVO encoder hardware which then gets pulled out via HDA in the
> other end. Ie. pretty much the same thing we had for native HDMI before
> we started to just pass the ELD between the drivers. This sort of
> explains why we even have that silly hardware buffer with native HDMI.
>
> $ cat /proc/asound/card0/eld#1.0
> -monitor_present 0
> -eld_valid 0
> +monitor_present 1
> +eld_valid 1
> +monitor_name LG TV
> +connection_type HDMI
> +...
>
> This also fixes our state readout since we can now query the SDVO
> encoder about the state of the "ELD valid" and "presence detect"
> bits. As mentioned those don't actually control whether audio
> gets sent over the HDMI cable, but it's the best we can do.
>
> Cc: stable at vger.kernel.org
> Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
> Cc: zardam at gmail.com
> Tested-by: zardam at gmail.com
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=108976
> Fixes: de44e256b92c ("drm/i915/sdvo: Shut up state checker with hdmi cards on gen3")
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
> drivers/gpu/drm/i915/intel_sdvo.c | 58 +++++++++++++++++++++-----
> drivers/gpu/drm/i915/intel_sdvo_regs.h | 3 ++
> 2 files changed, 50 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
> index 61db07244296..7f64352a3413 100644
> --- a/drivers/gpu/drm/i915/intel_sdvo.c
> +++ b/drivers/gpu/drm/i915/intel_sdvo.c
> @@ -916,6 +916,13 @@ static bool intel_sdvo_set_colorimetry(struct intel_sdvo *intel_sdvo,
> return intel_sdvo_set_value(intel_sdvo, SDVO_CMD_SET_COLORIMETRY, &mode, 1);
> }
>
> +static bool intel_sdvo_set_audio_state(struct intel_sdvo *intel_sdvo,
> + u8 audio_state)
> +{
> + return intel_sdvo_set_value(intel_sdvo, SDVO_CMD_SET_AUDIO_STAT,
> + &audio_state, 1);
> +}
> +
> #if 0
> static void intel_sdvo_dump_hdmi_buf(struct intel_sdvo *intel_sdvo)
> {
> @@ -1487,11 +1494,6 @@ static void intel_sdvo_pre_enable(struct intel_encoder *intel_encoder,
> else
> sdvox |= SDVO_PIPE_SEL(crtc->pipe);
>
> - if (crtc_state->has_audio) {
> - WARN_ON_ONCE(INTEL_GEN(dev_priv) < 4);
> - sdvox |= SDVO_AUDIO_ENABLE;
> - }
> -
> if (INTEL_GEN(dev_priv) >= 4) {
> /* done in crtc_mode_set as the dpll_md reg must be written early */
> } else if (IS_I945G(dev_priv) || IS_I945GM(dev_priv) ||
> @@ -1635,8 +1637,13 @@ static void intel_sdvo_get_config(struct intel_encoder *encoder,
> if (sdvox & HDMI_COLOR_RANGE_16_235)
> pipe_config->limited_color_range = true;
>
> - if (sdvox & SDVO_AUDIO_ENABLE)
> - pipe_config->has_audio = true;
> + if (intel_sdvo_get_value(intel_sdvo, SDVO_CMD_GET_AUDIO_STAT,
> + &val, 1)) {
> + u8 mask = SDVO_AUDIO_ELD_VALID | SDVO_AUDIO_PRESENCE_DETECT;
> +
> + if ((val & mask) == mask)
> + pipe_config->has_audio = true;
> + }
>
> if (intel_sdvo_get_value(intel_sdvo, SDVO_CMD_GET_ENCODE,
> &val, 1)) {
> @@ -1647,6 +1654,32 @@ static void intel_sdvo_get_config(struct intel_encoder *encoder,
> intel_sdvo_get_avi_infoframe(intel_sdvo, pipe_config);
> }
>
> +static void intel_sdvo_disable_audio(struct intel_sdvo *intel_sdvo)
> +{
> + intel_sdvo_set_audio_state(intel_sdvo, 0);
> +}
> +
> +static void intel_sdvo_enable_audio(struct intel_sdvo *intel_sdvo,
> + const struct intel_crtc_state *crtc_state,
> + const struct drm_connector_state *conn_state)
> +{
> + const struct drm_display_mode *adjusted_mode =
> + &crtc_state->base.adjusted_mode;
> + struct drm_connector *connector = conn_state->connector;
> + u8 *eld = connector->eld;
> +
> + eld[6] = drm_av_sync_delay(connector, adjusted_mode) / 2;
> +
> + intel_sdvo_set_audio_state(intel_sdvo, 0);
> +
> + intel_sdvo_write_infoframe(intel_sdvo, SDVO_HBUF_INDEX_ELD,
> + SDVO_HBUF_TX_DISABLED,
> + eld, drm_eld_size(eld));
> +
> + intel_sdvo_set_audio_state(intel_sdvo, SDVO_AUDIO_ELD_VALID |
> + SDVO_AUDIO_PRESENCE_DETECT);
> +}
> +
> static void intel_disable_sdvo(struct intel_encoder *encoder,
> const struct intel_crtc_state *old_crtc_state,
> const struct drm_connector_state *conn_state)
> @@ -1656,6 +1689,9 @@ static void intel_disable_sdvo(struct intel_encoder *encoder,
> struct intel_crtc *crtc = to_intel_crtc(old_crtc_state->base.crtc);
> u32 temp;
>
> + if (old_crtc_state->has_audio)
> + intel_sdvo_disable_audio(intel_sdvo);
> +
> intel_sdvo_set_active_outputs(intel_sdvo, 0);
> if (0)
> intel_sdvo_set_encoder_power_state(intel_sdvo,
> @@ -1741,6 +1777,9 @@ static void intel_enable_sdvo(struct intel_encoder *encoder,
> intel_sdvo_set_encoder_power_state(intel_sdvo,
> DRM_MODE_DPMS_ON);
> intel_sdvo_set_active_outputs(intel_sdvo, intel_sdvo->attached_output);
> +
> + if (pipe_config->has_audio)
> + intel_sdvo_enable_audio(intel_sdvo, pipe_config, conn_state);
> }
>
> static enum drm_mode_status
> @@ -2603,7 +2642,6 @@ static bool
> intel_sdvo_dvi_init(struct intel_sdvo *intel_sdvo, int device)
> {
> struct drm_encoder *encoder = &intel_sdvo->base.base;
> - struct drm_i915_private *dev_priv = to_i915(encoder->dev);
> struct drm_connector *connector;
> struct intel_encoder *intel_encoder = to_intel_encoder(encoder);
> struct intel_connector *intel_connector;
> @@ -2640,9 +2678,7 @@ intel_sdvo_dvi_init(struct intel_sdvo *intel_sdvo, int device)
> encoder->encoder_type = DRM_MODE_ENCODER_TMDS;
> connector->connector_type = DRM_MODE_CONNECTOR_DVID;
>
> - /* gen3 doesn't do the hdmi bits in the SDVO register */
> - if (INTEL_GEN(dev_priv) >= 4 &&
> - intel_sdvo_is_hdmi_connector(intel_sdvo, device)) {
> + if (intel_sdvo_is_hdmi_connector(intel_sdvo, device)) {
> connector->connector_type = DRM_MODE_CONNECTOR_HDMIA;
> intel_sdvo_connector->is_hdmi = true;
> }
> diff --git a/drivers/gpu/drm/i915/intel_sdvo_regs.h b/drivers/gpu/drm/i915/intel_sdvo_regs.h
> index db0ed499268a..e9ba3b047f93 100644
> --- a/drivers/gpu/drm/i915/intel_sdvo_regs.h
> +++ b/drivers/gpu/drm/i915/intel_sdvo_regs.h
> @@ -707,6 +707,9 @@ struct intel_sdvo_enhancements_arg {
> #define SDVO_CMD_GET_AUDIO_ENCRYPT_PREFER 0x90
> #define SDVO_CMD_SET_AUDIO_STAT 0x91
> #define SDVO_CMD_GET_AUDIO_STAT 0x92
> + #define SDVO_AUDIO_ELD_VALID (1 << 0)
> + #define SDVO_AUDIO_PRESENCE_DETECT (1 << 1)
> + #define SDVO_AUDIO_CP_READY (1 << 2)
> #define SDVO_CMD_SET_HBUF_INDEX 0x93
> #define SDVO_HBUF_INDEX_ELD 0
> #define SDVO_HBUF_INDEX_AVI_IF 1
> --
> 2.21.0
--
Ville Syrjälä
Intel
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