linux-kernel - [PATCH v2 86/91] drm/vc4: hdmi: Reset audio infoframe on encoder

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Message-Id: <b91d9f9de4a55d8bba5bcce4ae2b35ac6b94dfca.1587742492.git-series.maxime@cerno.tech>
Date:   Fri, 24 Apr 2020 17:35:07 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Eric Anholt <eric@...olt.net>
Cc:     dri-devel@...ts.freedesktop.org,
        linux-rpi-kernel@...ts.infradead.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Tim Gover <tim.gover@...pberrypi.com>,
        Phil Elwell <phil@...pberrypi.com>,
        Maxime Ripard <maxime@...no.tech>
Subject: [PATCH v2 86/91] drm/vc4: hdmi: Reset audio infoframe on encoder_enable if previously streaming

From: Dave Stevenson <dave.stevenson@...pberrypi.com>

If the encoder is disabled and re-enabled (eg mode change) all infoframes
are reset, whilst the audio subsystem know nothing about this change.
The driver therefore needs to reinstate the audio infoframe for
itself.

Signed-off-by: Dave Stevenson <dave.stevenson@...pberrypi.com>
Signed-off-by: Maxime Ripard <maxime@...no.tech>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c | 12 ++++++++++++
 drivers/gpu/drm/vc4/vc4_hdmi.h |  2 ++
 2 files changed, 14 insertions(+)

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 07304d156eeb..cac55386236f 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -310,8 +310,16 @@ static void vc4_hdmi_set_audio_infoframe(struct drm_encoder *encoder)
 
 static void vc4_hdmi_set_infoframes(struct drm_encoder *encoder)
 {
+	struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
+
 	vc4_hdmi_set_avi_infoframe(encoder);
 	vc4_hdmi_set_spd_infoframe(encoder);
+	/*
+	 * If audio was streaming, then we need to reenabled the audio
+	 * infoframe here during encoder_enable.
+	 */
+	if (vc4_hdmi->audio.streaming)
+		vc4_hdmi_set_audio_infoframe(encoder);
 }
 
 static void vc4_hdmi_encoder_disable(struct drm_encoder *encoder)
@@ -696,6 +704,7 @@ static void vc4_hdmi_audio_reset(struct vc4_hdmi *vc4_hdmi)
 	struct device *dev = &vc4_hdmi->pdev->dev;
 	int ret;
 
+	vc4_hdmi->audio.streaming = false;
 	ret = vc4_hdmi_stop_packet(encoder, HDMI_INFOFRAME_TYPE_AUDIO);
 	if (ret)
 		dev_err(dev, "Failed to stop audio infoframe: %d\n", ret);
@@ -799,6 +808,7 @@ static int vc4_hdmi_audio_trigger(struct snd_pcm_substream *substream, int cmd,
 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 		vc4_hdmi_set_audio_infoframe(encoder);
+		vc4_hdmi->audio.streaming = true;
 
 		if (vc4_hdmi->variant->phy_rng_enable)
 			vc4_hdmi->variant->phy_rng_enable(vc4_hdmi);
@@ -817,6 +827,8 @@ static int vc4_hdmi_audio_trigger(struct snd_pcm_substream *substream, int cmd,
 		if (vc4_hdmi->variant->phy_rng_disable)
 			vc4_hdmi->variant->phy_rng_disable(vc4_hdmi);
 
+		vc4_hdmi->audio.streaming = false;
+
 		break;
 	default:
 		break;
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.h b/drivers/gpu/drm/vc4/vc4_hdmi.h
index 9a6831b941d9..eb0f91b57316 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.h
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.h
@@ -85,6 +85,8 @@ struct vc4_hdmi_audio {
 	int channels;
 	struct snd_dmaengine_dai_dma_data dma_data;
 	struct snd_pcm_substream *substream;
+
+	bool streaming;
 };
 
 /* General HDMI hardware state. */
-- 
git-series 0.9.1