linux-kernel - [PATCH] drm: dw-hdmi-i2s: enable audio clock in audio

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Date:   Thu, 29 Aug 2019 12:29:57 +0800
From:   Cheng-Yi Chiang <cychiang@...omium.org>
To:     linux-kernel@...r.kernel.org
Cc:     alsa-devel@...a-project.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, a.hajda@...sung.com,
        Laurent.pinchart@...asonboard.com, airlied@...ux.ie,
        daniel@...ll.ch, kuninori.morimoto.gx@...esas.com,
        sam@...nborg.org, cychiang@...omium.org, dianders@...omium.org,
        dgreid@...omium.org, tzungbi@...omium.org,
        zhengxing@...k-chips.com, cain.cai@...k-chips.com,
        eddie.cai@...k-chips.com, jeffy.chen@...k-chips.com,
        enric.balletbo@...labora.com, dri-devel@...ts.freedesktop.org
Subject: [PATCH] drm: dw-hdmi-i2s: enable audio clock in audio_startup

In the designware databook, the sequence of enabling audio clock and
setting format is not clearly specified.
Currently, audio clock is enabled in the end of hw_param ops after
setting format.

On some monitors, there is a possibility that audio does not come out.
Fix this by enabling audio clock in audio_startup ops
before hw_param ops setting format.

Signed-off-by: Cheng-Yi Chiang <cychiang@...omium.org>
---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
index 5cbb71a866d5..08b4adbb1ddc 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
@@ -69,6 +69,14 @@ static int dw_hdmi_i2s_hw_params(struct device *dev, void *data,
 	hdmi_write(audio, conf0, HDMI_AUD_CONF0);
 	hdmi_write(audio, conf1, HDMI_AUD_CONF1);
 
+	return 0;
+}
+
+static int dw_hdmi_i2s_audio_startup(struct device *dev, void *data)
+{
+	struct dw_hdmi_i2s_audio_data *audio = data;
+	struct dw_hdmi *hdmi = audio->hdmi;
+
 	dw_hdmi_audio_enable(hdmi);
 
 	return 0;
@@ -105,6 +113,7 @@ static int dw_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
 }
 
 static struct hdmi_codec_ops dw_hdmi_i2s_ops = {
+	.audio_startup = dw_hdmi_i2s_audio_startup,
 	.hw_params	= dw_hdmi_i2s_hw_params,
 	.audio_shutdown	= dw_hdmi_i2s_audio_shutdown,
 	.get_dai_id	= dw_hdmi_i2s_get_dai_id,
-- 
2.23.0.187.g17f5b7556c-goog