[v3] drm: bridge/dw_hdmi: add audio sample channel status setting

Submitted by Cheng-Yi Chiang on Sept. 11, 2019, 8:26 a.m.

Details

Message ID 20190911082646.134347-1-cychiang@chromium.org
State New
Headers show
Series "drm: bridge/dw_hdmi: add audio sample channel status setting" ( rev: 3 ) in DRI devel

Not browsing as part of any series.

Commit Message

Cheng-Yi Chiang Sept. 11, 2019, 8:26 a.m.
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(+)

Patch hide | download patch | download mbox

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);

Comments

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
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

>>>
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
>>>>