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@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Jonas Karlman <jonas@kwiboo.se>
Tested-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190902035435.44463-1-cychiang@chromium.org

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 1d15cf9..34d8e83 100644 (file)
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
@@ -109,6 +109,14 @@ 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;
@@ -153,6 +161,7 @@ static int dw_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
 
 static struct hdmi_codec_ops dw_hdmi_i2s_ops = {
        .hw_params      = dw_hdmi_i2s_hw_params,
+       .audio_startup  = dw_hdmi_i2s_audio_startup,
        .audio_shutdown = dw_hdmi_i2s_audio_shutdown,
        .get_eld        = dw_hdmi_i2s_get_eld,
        .get_dai_id     = dw_hdmi_i2s_get_dai_id,