[alsa-devel] [PATCH v3] drm: bridge/dw_hdmi: add audio sample channel status setting

[alsa-devel] [PATCH v3] drm: bridge/dw_hdmi: add audio sample channel status setting

[Cheng-Yi Chiang]

From: Yakir Yang <ykk@rock-chips.com>

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>
---

Change from v2 to v3:
1. Reuse what is already set in iec.status in hw_param.
2. Remove all useless definition of registers and values.
3. Note that the original sampling frequency is not written to
   the channel status as we reuse create_iec958_consumer in pcm_iec958.c.
   Without that it can still play audio fine.

 .../drm/bridge/synopsys/dw-hdmi-i2s-audio.c   |  1 +
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c     | 20 +++++++++++++++++++
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.h     |  2 ++
 include/drm/bridge/dw_hdmi.h                  |  1 +
 4 files changed, 24 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 34d8e837555f..20f4f92dd866 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
@@ -102,6 +102,7 @@ static int dw_hdmi_i2s_hw_params(struct device *dev, void *data,
 	}
 
 	dw_hdmi_set_sample_rate(hdmi, hparms->sample_rate);
+	dw_hdmi_set_channel_status(hdmi, hparms->iec.status);
 	dw_hdmi_set_channel_count(hdmi, hparms->channels);
 	dw_hdmi_set_channel_allocation(hdmi, hparms->cea.channel_allocation);
 
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)
 {
diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
index 6988f12d89d9..fcff5059db24 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
@@ -158,6 +158,8 @@
 #define HDMI_FC_SPDDEVICEINF                    0x1062
 #define HDMI_FC_AUDSCONF                        0x1063
 #define HDMI_FC_AUDSSTAT                        0x1064
+#define HDMI_FC_AUDSCHNLS7                      0x106e
+#define HDMI_FC_AUDSCHNLS8                      0x106f
 #define HDMI_FC_DATACH0FILL                     0x1070
 #define HDMI_FC_DATACH1FILL                     0x1071
 #define HDMI_FC_DATACH2FILL                     0x1072
diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h
index cf528c289857..4b3e863c4f8a 100644
--- a/include/drm/bridge/dw_hdmi.h
+++ b/include/drm/bridge/dw_hdmi.h
@@ -156,6 +156,7 @@ void dw_hdmi_setup_rx_sense(struct dw_hdmi *hdmi, bool hpd, bool rx_sense);
 
 void dw_hdmi_set_sample_rate(struct dw_hdmi *hdmi, unsigned int rate);
 void dw_hdmi_set_channel_count(struct dw_hdmi *hdmi, unsigned int cnt);
+void dw_hdmi_set_channel_status(struct dw_hdmi *hdmi, u8 *channel_status);
 void dw_hdmi_set_channel_allocation(struct dw_hdmi *hdmi, unsigned int ca);
 void dw_hdmi_audio_enable(struct dw_hdmi *hdmi);
 void dw_hdmi_audio_disable(struct dw_hdmi *hdmi);
-- 
2.23.0.162.g0b9fbb3734-goog

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Re: [alsa-devel] [PATCH v3] drm: bridge/dw_hdmi: add audio sample channel status setting

[Neil Armstrong]

On 11/09/2019 10:26, Cheng-Yi Chiang wrote:
> From: Yakir Yang <ykk@rock-chips.com>
> 
> 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>
> ---
> 
> Change from v2 to v3:
> 1. Reuse what is already set in iec.status in hw_param.
> 2. Remove all useless definition of registers and values.
> 3. Note that the original sampling frequency is not written to
>    the channel status as we reuse create_iec958_consumer in pcm_iec958.c.
>    Without that it can still play audio fine.
> 
>  .../drm/bridge/synopsys/dw-hdmi-i2s-audio.c   |  1 +
>  drivers/gpu/drm/bridge/synopsys/dw-hdmi.c     | 20 +++++++++++++++++++
>  drivers/gpu/drm/bridge/synopsys/dw-hdmi.h     |  2 ++
>  include/drm/bridge/dw_hdmi.h                  |  1 +
>  4 files changed, 24 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 34d8e837555f..20f4f92dd866 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
> @@ -102,6 +102,7 @@ static int dw_hdmi_i2s_hw_params(struct device *dev, void *data,
>  	}
>  
>  	dw_hdmi_set_sample_rate(hdmi, hparms->sample_rate);
> +	dw_hdmi_set_channel_status(hdmi, hparms->iec.status);
>  	dw_hdmi_set_channel_count(hdmi, hparms->channels);
>  	dw_hdmi_set_channel_allocation(hdmi, hparms->cea.channel_allocation);
>  
> 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)
>  {
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
> index 6988f12d89d9..fcff5059db24 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
> @@ -158,6 +158,8 @@
>  #define HDMI_FC_SPDDEVICEINF                    0x1062
>  #define HDMI_FC_AUDSCONF                        0x1063
>  #define HDMI_FC_AUDSSTAT                        0x1064
> +#define HDMI_FC_AUDSCHNLS7                      0x106e
> +#define HDMI_FC_AUDSCHNLS8                      0x106f
>  #define HDMI_FC_DATACH0FILL                     0x1070
>  #define HDMI_FC_DATACH1FILL                     0x1071
>  #define HDMI_FC_DATACH2FILL                     0x1072
> diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h
> index cf528c289857..4b3e863c4f8a 100644
> --- a/include/drm/bridge/dw_hdmi.h
> +++ b/include/drm/bridge/dw_hdmi.h
> @@ -156,6 +156,7 @@ void dw_hdmi_setup_rx_sense(struct dw_hdmi *hdmi, bool hpd, bool rx_sense);
>  
>  void dw_hdmi_set_sample_rate(struct dw_hdmi *hdmi, unsigned int rate);
>  void dw_hdmi_set_channel_count(struct dw_hdmi *hdmi, unsigned int cnt);
> +void dw_hdmi_set_channel_status(struct dw_hdmi *hdmi, u8 *channel_status);
>  void dw_hdmi_set_channel_allocation(struct dw_hdmi *hdmi, unsigned int ca);
>  void dw_hdmi_audio_enable(struct dw_hdmi *hdmi);
>  void dw_hdmi_audio_disable(struct dw_hdmi *hdmi);
> 

Looks fine for me:
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>

Jonas ? Jernej ? Russell ?

If it's ok for you I'll apply it.

Neil
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Re: [alsa-devel] [PATCH v3] drm: bridge/dw_hdmi: add audio sample channel status setting

[Jernej Škrabec]

Dne sreda, 11. september 2019 ob 18:23:59 CEST je Neil Armstrong napisal(a):
> On 11/09/2019 10:26, Cheng-Yi Chiang wrote:
> > From: Yakir Yang <ykk@rock-chips.com>
> > 
> > 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>
> > ---
> > 
> > Change from v2 to v3:
> > 1. Reuse what is already set in iec.status in hw_param.
> > 2. Remove all useless definition of registers and values.
> > 3. Note that the original sampling frequency is not written to
> > 
> >    the channel status as we reuse create_iec958_consumer in pcm_iec958.c.
> >    Without that it can still play audio fine.
> >  
> >  .../drm/bridge/synopsys/dw-hdmi-i2s-audio.c   |  1 +
> >  drivers/gpu/drm/bridge/synopsys/dw-hdmi.c     | 20 +++++++++++++++++++
> >  drivers/gpu/drm/bridge/synopsys/dw-hdmi.h     |  2 ++
> >  include/drm/bridge/dw_hdmi.h                  |  1 +
> >  4 files changed, 24 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
> > 34d8e837555f..20f4f92dd866 100644
> > --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
> > +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
> > @@ -102,6 +102,7 @@ static int dw_hdmi_i2s_hw_params(struct device *dev,
> > void *data,> 
> >  	}
> >  	
> >  	dw_hdmi_set_sample_rate(hdmi, hparms->sample_rate);
> > 
> > +	dw_hdmi_set_channel_status(hdmi, hparms->iec.status);
> > 
> >  	dw_hdmi_set_channel_count(hdmi, hparms->channels);
> >  	dw_hdmi_set_channel_allocation(hdmi, hparms-
>cea.channel_allocation);
> > 
> > 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)
> >  
> >  {
> > 
> > diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
> > b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h index
> > 6988f12d89d9..fcff5059db24 100644
> > --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
> > +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
> > @@ -158,6 +158,8 @@
> > 
> >  #define HDMI_FC_SPDDEVICEINF                    0x1062
> >  #define HDMI_FC_AUDSCONF                        0x1063
> >  #define HDMI_FC_AUDSSTAT                        0x1064
> > 
> > +#define HDMI_FC_AUDSCHNLS7                      0x106e
> > +#define HDMI_FC_AUDSCHNLS8                      0x106f
> > 
> >  #define HDMI_FC_DATACH0FILL                     0x1070
> >  #define HDMI_FC_DATACH1FILL                     0x1071
> >  #define HDMI_FC_DATACH2FILL                     0x1072
> > 
> > diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h
> > index cf528c289857..4b3e863c4f8a 100644
> > --- a/include/drm/bridge/dw_hdmi.h
> > +++ b/include/drm/bridge/dw_hdmi.h
> > @@ -156,6 +156,7 @@ void dw_hdmi_setup_rx_sense(struct dw_hdmi *hdmi, bool
> > hpd, bool rx_sense);> 
> >  void dw_hdmi_set_sample_rate(struct dw_hdmi *hdmi, unsigned int rate);
> >  void dw_hdmi_set_channel_count(struct dw_hdmi *hdmi, unsigned int cnt);
> > 
> > +void dw_hdmi_set_channel_status(struct dw_hdmi *hdmi, u8
> > *channel_status);
> > 
> >  void dw_hdmi_set_channel_allocation(struct dw_hdmi *hdmi, unsigned int
> >  ca);
> >  void dw_hdmi_audio_enable(struct dw_hdmi *hdmi);
> >  void dw_hdmi_audio_disable(struct dw_hdmi *hdmi);
> 
> Looks fine for me:
> Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
> 
> Jonas ? Jernej ? Russell ?

Patch itself is fine, I'm just wondering if more information should be copied 
from status array to registers. But I think they are not 1:1 mapping so some 
more work would be needed. Anyway, patch is:

Reviewed-by: Jernej Skrabec <jernej.skrabec@siol.net>

Best regards,
Jernej

> 
> If it's ok for you I'll apply it.
> 
> Neil




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Re: [alsa-devel] [PATCH v3] drm: bridge/dw_hdmi: add audio sample channel status setting

[Cheng-yi Chiang]

On Thu, Sep 12, 2019 at 12:54 AM Jernej Škrabec <jernej.skrabec@siol.net> wrote:
>
> Dne sreda, 11. september 2019 ob 18:23:59 CEST je Neil Armstrong napisal(a):
> > On 11/09/2019 10:26, Cheng-Yi Chiang wrote:
> > > From: Yakir Yang <ykk@rock-chips.com>
> > >
> > > 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>
> > > ---
> > >
> > > Change from v2 to v3:
> > > 1. Reuse what is already set in iec.status in hw_param.
> > > 2. Remove all useless definition of registers and values.
> > > 3. Note that the original sampling frequency is not written to
> > >
> > >    the channel status as we reuse create_iec958_consumer in pcm_iec958.c.
> > >    Without that it can still play audio fine.
> > >
> > >  .../drm/bridge/synopsys/dw-hdmi-i2s-audio.c   |  1 +
> > >  drivers/gpu/drm/bridge/synopsys/dw-hdmi.c     | 20 +++++++++++++++++++
> > >  drivers/gpu/drm/bridge/synopsys/dw-hdmi.h     |  2 ++
> > >  include/drm/bridge/dw_hdmi.h                  |  1 +
> > >  4 files changed, 24 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
> > > 34d8e837555f..20f4f92dd866 100644
> > > --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
> > > +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
> > > @@ -102,6 +102,7 @@ static int dw_hdmi_i2s_hw_params(struct device *dev,
> > > void *data,>
> > >     }
> > >
> > >     dw_hdmi_set_sample_rate(hdmi, hparms->sample_rate);
> > >
> > > +   dw_hdmi_set_channel_status(hdmi, hparms->iec.status);
> > >
> > >     dw_hdmi_set_channel_count(hdmi, hparms->channels);
> > >     dw_hdmi_set_channel_allocation(hdmi, hparms-
> >cea.channel_allocation);
> > >
> > > 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)
> > >
> > >  {
> > >
> > > diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
> > > b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h index
> > > 6988f12d89d9..fcff5059db24 100644
> > > --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
> > > +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
> > > @@ -158,6 +158,8 @@
> > >
> > >  #define HDMI_FC_SPDDEVICEINF                    0x1062
> > >  #define HDMI_FC_AUDSCONF                        0x1063
> > >  #define HDMI_FC_AUDSSTAT                        0x1064
> > >
> > > +#define HDMI_FC_AUDSCHNLS7                      0x106e
> > > +#define HDMI_FC_AUDSCHNLS8                      0x106f
> > >
> > >  #define HDMI_FC_DATACH0FILL                     0x1070
> > >  #define HDMI_FC_DATACH1FILL                     0x1071
> > >  #define HDMI_FC_DATACH2FILL                     0x1072
> > >
> > > diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h
> > > index cf528c289857..4b3e863c4f8a 100644
> > > --- a/include/drm/bridge/dw_hdmi.h
> > > +++ b/include/drm/bridge/dw_hdmi.h
> > > @@ -156,6 +156,7 @@ void dw_hdmi_setup_rx_sense(struct dw_hdmi *hdmi, bool
> > > hpd, bool rx_sense);>
> > >  void dw_hdmi_set_sample_rate(struct dw_hdmi *hdmi, unsigned int rate);
> > >  void dw_hdmi_set_channel_count(struct dw_hdmi *hdmi, unsigned int cnt);
> > >
> > > +void dw_hdmi_set_channel_status(struct dw_hdmi *hdmi, u8
> > > *channel_status);
> > >
> > >  void dw_hdmi_set_channel_allocation(struct dw_hdmi *hdmi, unsigned int
> > >  ca);
> > >  void dw_hdmi_audio_enable(struct dw_hdmi *hdmi);
> > >  void dw_hdmi_audio_disable(struct dw_hdmi *hdmi);
> >
> > Looks fine for me:
> > Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
> >
> > Jonas ? Jernej ? Russell ?
>
> Patch itself is fine, I'm just wondering if more information should be copied
> from status array to registers. But I think they are not 1:1 mapping so some
> more work would be needed. Anyway, patch is:

Hi Jernej,
Yes you are right. I was thinking about the same thing.
But there are also some fields in the IEC60958 spec not mapped to the
registers on dw-hdmi.
So I ended up just writing the two registers in the original ykk's
patch, and ignoring "original sampling frequency" like pcm_iec958.
It turns out that audio plays fine on my LG monitor. So I suggest we
can keep this patch as simple as it is, and add more register setting
if we find issue.
Thanks!

>
>
> Reviewed-by: Jernej Skrabec <jernej.skrabec@siol.net>
>
> Best regards,
> Jernej
>
> >
> > If it's ok for you I'll apply it.
> >
> > Neil
>
>
>
>
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Re: [alsa-devel] [PATCH v3] drm: bridge/dw_hdmi: add audio sample channel status setting

[Jernej Škrabec]

Dne sreda, 11. september 2019 ob 19:02:38 CEST je Cheng-yi Chiang napisal(a):
> On Thu, Sep 12, 2019 at 12:54 AM Jernej Škrabec <jernej.skrabec@siol.net> 
wrote:
> > Dne sreda, 11. september 2019 ob 18:23:59 CEST je Neil Armstrong 
napisal(a):
> > > On 11/09/2019 10:26, Cheng-Yi Chiang wrote:
> > > > From: Yakir Yang <ykk@rock-chips.com>
> > > > 
> > > > 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>
> > > > ---
> > > > 
> > > > Change from v2 to v3:
> > > > 1. Reuse what is already set in iec.status in hw_param.
> > > > 2. Remove all useless definition of registers and values.
> > > > 3. Note that the original sampling frequency is not written to
> > > > 
> > > >    the channel status as we reuse create_iec958_consumer in
> > > >    pcm_iec958.c.
> > > >    Without that it can still play audio fine.
> > > >  
> > > >  .../drm/bridge/synopsys/dw-hdmi-i2s-audio.c   |  1 +
> > > >  drivers/gpu/drm/bridge/synopsys/dw-hdmi.c     | 20
> > > >  +++++++++++++++++++
> > > >  drivers/gpu/drm/bridge/synopsys/dw-hdmi.h     |  2 ++
> > > >  include/drm/bridge/dw_hdmi.h                  |  1 +
> > > >  4 files changed, 24 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
> > > > 34d8e837555f..20f4f92dd866 100644
> > > > --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
> > > > +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
> > > > @@ -102,6 +102,7 @@ static int dw_hdmi_i2s_hw_params(struct device
> > > > *dev,
> > > > void *data,>
> > > > 
> > > >     }
> > > >     
> > > >     dw_hdmi_set_sample_rate(hdmi, hparms->sample_rate);
> > > > 
> > > > +   dw_hdmi_set_channel_status(hdmi, hparms->iec.status);
> > > > 
> > > >     dw_hdmi_set_channel_count(hdmi, hparms->channels);
> > > >     dw_hdmi_set_channel_allocation(hdmi, hparms-
> > >
> > >cea.channel_allocation);
> > >
> > > > 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)
> > > >  
> > > >  {
> > > > 
> > > > diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
> > > > b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h index
> > > > 6988f12d89d9..fcff5059db24 100644
> > > > --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
> > > > +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
> > > > @@ -158,6 +158,8 @@
> > > > 
> > > >  #define HDMI_FC_SPDDEVICEINF                    0x1062
> > > >  #define HDMI_FC_AUDSCONF                        0x1063
> > > >  #define HDMI_FC_AUDSSTAT                        0x1064
> > > > 
> > > > +#define HDMI_FC_AUDSCHNLS7                      0x106e
> > > > +#define HDMI_FC_AUDSCHNLS8                      0x106f
> > > > 
> > > >  #define HDMI_FC_DATACH0FILL                     0x1070
> > > >  #define HDMI_FC_DATACH1FILL                     0x1071
> > > >  #define HDMI_FC_DATACH2FILL                     0x1072
> > > > 
> > > > diff --git a/include/drm/bridge/dw_hdmi.h
> > > > b/include/drm/bridge/dw_hdmi.h
> > > > index cf528c289857..4b3e863c4f8a 100644
> > > > --- a/include/drm/bridge/dw_hdmi.h
> > > > +++ b/include/drm/bridge/dw_hdmi.h
> > > > @@ -156,6 +156,7 @@ void dw_hdmi_setup_rx_sense(struct dw_hdmi *hdmi,
> > > > bool
> > > > hpd, bool rx_sense);>
> > > > 
> > > >  void dw_hdmi_set_sample_rate(struct dw_hdmi *hdmi, unsigned int
> > > >  rate);
> > > >  void dw_hdmi_set_channel_count(struct dw_hdmi *hdmi, unsigned int
> > > >  cnt);
> > > > 
> > > > +void dw_hdmi_set_channel_status(struct dw_hdmi *hdmi, u8
> > > > *channel_status);
> > > > 
> > > >  void dw_hdmi_set_channel_allocation(struct dw_hdmi *hdmi, unsigned
> > > >  int
> > > >  ca);
> > > >  void dw_hdmi_audio_enable(struct dw_hdmi *hdmi);
> > > >  void dw_hdmi_audio_disable(struct dw_hdmi *hdmi);
> > > 
> > > Looks fine for me:
> > > Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
> > > 
> > > Jonas ? Jernej ? Russell ?
> > 
> > Patch itself is fine, I'm just wondering if more information should be
> > copied from status array to registers. But I think they are not 1:1
> > mapping so some
> > more work would be needed. Anyway, patch is:
> Hi Jernej,
> Yes you are right. I was thinking about the same thing.
> But there are also some fields in the IEC60958 spec not mapped to the
> registers on dw-hdmi.
> So I ended up just writing the two registers in the original ykk's
> patch, and ignoring "original sampling frequency" like pcm_iec958.
> It turns out that audio plays fine on my LG monitor. So I suggest we
> can keep this patch as simple as it is, and add more register setting
> if we find issue.
> Thanks!

I think that for reliable audio passthrough support these registers will have 
to be updated, but as I said, I'm fine with this patch as-is.

Best regards,
Jernej

> 
> > Reviewed-by: Jernej Skrabec <jernej.skrabec@siol.net>
> > 
> > Best regards,
> > Jernej
> > 
> > > If it's ok for you I'll apply it.
> > > 
> > > Neil




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Re: [alsa-devel] [PATCH v3] drm: bridge/dw_hdmi: add audio sample channel status setting

[Jonas Karlman]

On 2019-09-11 19:02, Cheng-yi Chiang wrote:
> On Thu, Sep 12, 2019 at 12:54 AM Jernej Škrabec <jernej.skrabec@siol.net> wrote:
>> Dne sreda, 11. september 2019 ob 18:23:59 CEST je Neil Armstrong napisal(a):
>>> On 11/09/2019 10:26, Cheng-Yi Chiang wrote:
>>>> From: Yakir Yang <ykk@rock-chips.com>
>>>>
>>>> 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>
>>>> ---
>>>>
>>>> Change from v2 to v3:
>>>> 1. Reuse what is already set in iec.status in hw_param.
>>>> 2. Remove all useless definition of registers and values.
>>>> 3. Note that the original sampling frequency is not written to
>>>>
>>>>    the channel status as we reuse create_iec958_consumer in pcm_iec958.c.
>>>>    Without that it can still play audio fine.
>>>>
>>>>  .../drm/bridge/synopsys/dw-hdmi-i2s-audio.c   |  1 +
>>>>  drivers/gpu/drm/bridge/synopsys/dw-hdmi.c     | 20 +++++++++++++++++++
>>>>  drivers/gpu/drm/bridge/synopsys/dw-hdmi.h     |  2 ++
>>>>  include/drm/bridge/dw_hdmi.h                  |  1 +
>>>>  4 files changed, 24 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
>>>> 34d8e837555f..20f4f92dd866 100644
>>>> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
>>>> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
>>>> @@ -102,6 +102,7 @@ static int dw_hdmi_i2s_hw_params(struct device *dev,
>>>> void *data,>
>>>>     }
>>>>
>>>>     dw_hdmi_set_sample_rate(hdmi, hparms->sample_rate);
>>>>
>>>> +   dw_hdmi_set_channel_status(hdmi, hparms->iec.status);
>>>>
>>>>     dw_hdmi_set_channel_count(hdmi, hparms->channels);
>>>>     dw_hdmi_set_channel_allocation(hdmi, hparms-
>>> cea.channel_allocation);
>>>> 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)
>>>>
>>>>  {
>>>>
>>>> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
>>>> b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h index
>>>> 6988f12d89d9..fcff5059db24 100644
>>>> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
>>>> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
>>>> @@ -158,6 +158,8 @@
>>>>
>>>>  #define HDMI_FC_SPDDEVICEINF                    0x1062
>>>>  #define HDMI_FC_AUDSCONF                        0x1063
>>>>  #define HDMI_FC_AUDSSTAT                        0x1064
>>>>
>>>> +#define HDMI_FC_AUDSCHNLS7                      0x106e
>>>> +#define HDMI_FC_AUDSCHNLS8                      0x106f
>>>>
>>>>  #define HDMI_FC_DATACH0FILL                     0x1070
>>>>  #define HDMI_FC_DATACH1FILL                     0x1071
>>>>  #define HDMI_FC_DATACH2FILL                     0x1072
>>>>
>>>> diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h
>>>> index cf528c289857..4b3e863c4f8a 100644
>>>> --- a/include/drm/bridge/dw_hdmi.h
>>>> +++ b/include/drm/bridge/dw_hdmi.h
>>>> @@ -156,6 +156,7 @@ void dw_hdmi_setup_rx_sense(struct dw_hdmi *hdmi, bool
>>>> hpd, bool rx_sense);>
>>>>  void dw_hdmi_set_sample_rate(struct dw_hdmi *hdmi, unsigned int rate);
>>>>  void dw_hdmi_set_channel_count(struct dw_hdmi *hdmi, unsigned int cnt);
>>>>
>>>> +void dw_hdmi_set_channel_status(struct dw_hdmi *hdmi, u8
>>>> *channel_status);
>>>>
>>>>  void dw_hdmi_set_channel_allocation(struct dw_hdmi *hdmi, unsigned int
>>>>  ca);
>>>>  void dw_hdmi_audio_enable(struct dw_hdmi *hdmi);
>>>>  void dw_hdmi_audio_disable(struct dw_hdmi *hdmi);
>>> Looks fine for me:
>>> Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
>>>
>>> Jonas ? Jernej ? Russell ?
>> Patch itself is fine, I'm just wondering if more information should be copied
>> from status array to registers. But I think they are not 1:1 mapping so some
>> more work would be needed. Anyway, patch is:
> Hi Jernej,
> Yes you are right. I was thinking about the same thing.
> But there are also some fields in the IEC60958 spec not mapped to the
> registers on dw-hdmi.
> So I ended up just writing the two registers in the original ykk's
> patch, and ignoring "original sampling frequency" like pcm_iec958.
> It turns out that audio plays fine on my LG monitor. So I suggest we
> can keep this patch as simple as it is, and add more register setting
> if we find issue.
> Thanks!

In my old multi-channel lpcm patch [1] I only wrote sample rate to FC_AUDSCHNLS7.
This is much cleaner and simpler, and setting FC_AUDSCHNLS8 does not cause any
problems when I tested on ASUS Tinker Board S (RK3288).

Reviewed-by: Jonas Karlman <jonas@kwiboo.se>


[1] https://github.com/Kwiboo/linux-rockchip/commit/4af9ebc567ccf0a0851fa260097021c27aebbb6b

Regards,
Jonas

>
>>
>> Reviewed-by: Jernej Skrabec <jernej.skrabec@siol.net>
>>
>> Best regards,
>> Jernej
>>
>>> If it's ok for you I'll apply it.
>>>
>>> Neil
>>>
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Re: [alsa-devel] [PATCH v3] drm: bridge/dw_hdmi: add audio sample channel status setting

[Neil Armstrong]

On 13/09/2019 08:37, Jonas Karlman wrote:
> On 2019-09-11 19:02, Cheng-yi Chiang wrote:
>> On Thu, Sep 12, 2019 at 12:54 AM Jernej Škrabec <jernej.skrabec@siol.net> wrote:
>>> Dne sreda, 11. september 2019 ob 18:23:59 CEST je Neil Armstrong napisal(a):
>>>> On 11/09/2019 10:26, Cheng-Yi Chiang wrote:
>>>>> From: Yakir Yang <ykk@rock-chips.com>
>>>>>
>>>>> 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>
>>>>> ---
>>>>>
>>>>> Change from v2 to v3:
>>>>> 1. Reuse what is already set in iec.status in hw_param.
>>>>> 2. Remove all useless definition of registers and values.
>>>>> 3. Note that the original sampling frequency is not written to
>>>>>
>>>>>    the channel status as we reuse create_iec958_consumer in pcm_iec958.c.
>>>>>    Without that it can still play audio fine.
>>>>>
>>>>>  .../drm/bridge/synopsys/dw-hdmi-i2s-audio.c   |  1 +
>>>>>  drivers/gpu/drm/bridge/synopsys/dw-hdmi.c     | 20 +++++++++++++++++++
>>>>>  drivers/gpu/drm/bridge/synopsys/dw-hdmi.h     |  2 ++
>>>>>  include/drm/bridge/dw_hdmi.h                  |  1 +
>>>>>  4 files changed, 24 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
>>>>> 34d8e837555f..20f4f92dd866 100644
>>>>> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
>>>>> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
>>>>> @@ -102,6 +102,7 @@ static int dw_hdmi_i2s_hw_params(struct device *dev,
>>>>> void *data,>
>>>>>     }
>>>>>
>>>>>     dw_hdmi_set_sample_rate(hdmi, hparms->sample_rate);
>>>>>
>>>>> +   dw_hdmi_set_channel_status(hdmi, hparms->iec.status);
>>>>>
>>>>>     dw_hdmi_set_channel_count(hdmi, hparms->channels);
>>>>>     dw_hdmi_set_channel_allocation(hdmi, hparms-
>>>> cea.channel_allocation);
>>>>> 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)
>>>>>
>>>>>  {
>>>>>
>>>>> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
>>>>> b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h index
>>>>> 6988f12d89d9..fcff5059db24 100644
>>>>> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
>>>>> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
>>>>> @@ -158,6 +158,8 @@
>>>>>
>>>>>  #define HDMI_FC_SPDDEVICEINF                    0x1062
>>>>>  #define HDMI_FC_AUDSCONF                        0x1063
>>>>>  #define HDMI_FC_AUDSSTAT                        0x1064
>>>>>
>>>>> +#define HDMI_FC_AUDSCHNLS7                      0x106e
>>>>> +#define HDMI_FC_AUDSCHNLS8                      0x106f
>>>>>
>>>>>  #define HDMI_FC_DATACH0FILL                     0x1070
>>>>>  #define HDMI_FC_DATACH1FILL                     0x1071
>>>>>  #define HDMI_FC_DATACH2FILL                     0x1072
>>>>>
>>>>> diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h
>>>>> index cf528c289857..4b3e863c4f8a 100644
>>>>> --- a/include/drm/bridge/dw_hdmi.h
>>>>> +++ b/include/drm/bridge/dw_hdmi.h
>>>>> @@ -156,6 +156,7 @@ void dw_hdmi_setup_rx_sense(struct dw_hdmi *hdmi, bool
>>>>> hpd, bool rx_sense);>
>>>>>  void dw_hdmi_set_sample_rate(struct dw_hdmi *hdmi, unsigned int rate);
>>>>>  void dw_hdmi_set_channel_count(struct dw_hdmi *hdmi, unsigned int cnt);
>>>>>
>>>>> +void dw_hdmi_set_channel_status(struct dw_hdmi *hdmi, u8
>>>>> *channel_status);
>>>>>
>>>>>  void dw_hdmi_set_channel_allocation(struct dw_hdmi *hdmi, unsigned int
>>>>>  ca);
>>>>>  void dw_hdmi_audio_enable(struct dw_hdmi *hdmi);
>>>>>  void dw_hdmi_audio_disable(struct dw_hdmi *hdmi);
>>>> Looks fine for me:
>>>> Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
>>>>
>>>> Jonas ? Jernej ? Russell ?
>>> Patch itself is fine, I'm just wondering if more information should be copied
>>> from status array to registers. But I think they are not 1:1 mapping so some
>>> more work would be needed. Anyway, patch is:
>> Hi Jernej,
>> Yes you are right. I was thinking about the same thing.
>> But there are also some fields in the IEC60958 spec not mapped to the
>> registers on dw-hdmi.
>> So I ended up just writing the two registers in the original ykk's
>> patch, and ignoring "original sampling frequency" like pcm_iec958.
>> It turns out that audio plays fine on my LG monitor. So I suggest we
>> can keep this patch as simple as it is, and add more register setting
>> if we find issue.
>> Thanks!
> 
> In my old multi-channel lpcm patch [1] I only wrote sample rate to FC_AUDSCHNLS7.
> This is much cleaner and simpler, and setting FC_AUDSCHNLS8 does not cause any
> problems when I tested on ASUS Tinker Board S (RK3288).
> 
> Reviewed-by: Jonas Karlman <jonas@kwiboo.se>
> 
> 
> [1] https://github.com/Kwiboo/linux-rockchip/commit/4af9ebc567ccf0a0851fa260097021c27aebbb6b

Thanks Jonas, Jernej,

Applying now.

Neil

> 
> Regards,
> Jonas
> 
>>
>>>
>>> Reviewed-by: Jernej Skrabec <jernej.skrabec@siol.net>
>>>
>>> Best regards,
>>> Jernej
>>>
>>>> If it's ok for you I'll apply it.
>>>>
>>>> Neil
>>>>

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