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drm/bridge: dw-hdmi-i2s: reset audio fifo before applying new params

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When changing the audio hw params, reset the audio fifo to make sure
any old remaining data is flushed.

The databook mentions that such reset should be followed by a reset of
the i2s block to make sure the samples stay aligned

Reviewed-by: Jonas Karlman <jonas@kwiboo.se>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190812120726.1528-7-jbrunet@baylibre.com
This commit is contained in:
Jerome Brunet 2019-08-12 14:07:24 +02:00 • committed by Neil Armstrong
parent 0c60988591
commit 46cecde310
2 changed files with 5 additions and 2 deletions
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6
drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
View file

@ -49,6 +49,10 @@ static int dw_hdmi_i2s_hw_params(struct device *dev, void *data,
return -EINVAL;
}
/* Reset the FIFOs before applying new params */
hdmi_write(audio, HDMI_AUD_CONF0_SW_RESET, HDMI_AUD_CONF0);
hdmi_write(audio, (u8)~HDMI_MC_SWRSTZ_I2SSWRST_REQ, HDMI_MC_SWRSTZ);
inputclkfs = HDMI_AUD_INPUTCLKFS_64FS;
conf0 = HDMI_AUD_CONF0_I2S_ALL_ENABLE;
@ -102,8 +106,6 @@ static void dw_hdmi_i2s_audio_shutdown(struct device *dev, void *data)
struct dw_hdmi *hdmi = audio->hdmi;
dw_hdmi_audio_disable(hdmi);
hdmi_write(audio, HDMI_AUD_CONF0_SW_RESET, HDMI_AUD_CONF0);
}
static int dw_hdmi_i2s_get_dai_id(struct snd_soc_component *component,

1
drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
View file

@ -940,6 +940,7 @@ enum {
HDMI_MC_CLKDIS_PIXELCLK_DISABLE = 0x1,
/* MC_SWRSTZ field values */
HDMI_MC_SWRSTZ_I2SSWRST_REQ = 0x08,
HDMI_MC_SWRSTZ_TMDSSWRST_REQ = 0x02,
/* MC_FLOWCTRL field values */