diff options
| author | Yakir Yang <ykk@rock-chips.com> | 2019-09-11 16:26:46 +0800 |
|---|---|---|
| committer | Neil Armstrong <narmstrong@baylibre.com> | 2019-09-13 10:43:51 +0200 |
| commit | 3250cdf938dce5447cf4f895bb3ec3b929a95e09 (patch) | |
| tree | 0152d047929dc1715c0e3254fe6526b2e7767d50 /drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | |
| parent | de2358050ab8225117d3252de52f85e260b5dad5 (diff) | |
drm: bridge/dw_hdmi: add audio sample channel status setting
When transmitting IEC60985 linear PCM audio, we configure the
Aduio Sample Channel Status information in the IEC60958 frame.
The status bit is already available in iec.status of hdmi_codec_params.
This fix the issue that audio does not come out on some monitors
(e.g. LG 22CV241)
Note that these registers are only for interfaces:
I2S audio interface, General Purpose Audio (GPA), or AHB audio DMA
(AHBAUDDMA).
For S/PDIF interface this information comes from the stream.
Currently this function dw_hdmi_set_channel_status is only called
from dw-hdmi-i2s-audio in I2S setup.
Signed-off-by: Yakir Yang <ykk@rock-chips.com>
Signed-off-by: Cheng-Yi Chiang <cychiang@chromium.org>
Reviewed-by: Jonas Karlman <jonas@kwiboo.se>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190911082646.134347-1-cychiang@chromium.org
Diffstat (limited to 'drivers/gpu/drm/bridge/synopsys/dw-hdmi.c')
| -rw-r--r-- | drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c index bd65d0479683..aa7efd4da1c8 100644 --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c @@ -582,6 +582,26 @@ static unsigned int hdmi_compute_n(unsigned int freq, unsigned long pixel_clk) return n; } +/* + * When transmitting IEC60958 linear PCM audio, these registers allow to + * configure the channel status information of all the channel status + * bits in the IEC60958 frame. For the moment this configuration is only + * used when the I2S audio interface, General Purpose Audio (GPA), + * or AHB audio DMA (AHBAUDDMA) interface is active + * (for S/PDIF interface this information comes from the stream). + */ +void dw_hdmi_set_channel_status(struct dw_hdmi *hdmi, + u8 *channel_status) +{ + /* + * Set channel status register for frequency and word length. + * Use default values for other registers. + */ + hdmi_writeb(hdmi, channel_status[3], HDMI_FC_AUDSCHNLS7); + hdmi_writeb(hdmi, channel_status[4], HDMI_FC_AUDSCHNLS8); +} +EXPORT_SYMBOL_GPL(dw_hdmi_set_channel_status); + static void hdmi_set_clk_regenerator(struct dw_hdmi *hdmi, unsigned long pixel_clk, unsigned int sample_rate) { |