RK3188 No HDMI Sound on KitKat on some TVs FIX !!!

[smic717394]

On KitKat, some TV you may get sound from HDMI, this is not a fault actually is feature of the SOC. Basically your unit tries to communicate with the TV and if the TV does not reply back in a certain time the unit assume you are connecting to a DVI monitor rather than a TV so it cuts the sound.

I looked around and I count find a solution and at the request of some members I spent one night trying to fix this issue and in the end I fix it and decide to share the findings with the community, maybe somebody else can benefit from them.

If there is a easier way I don’t know. If it helped you let me know.

1. Open file drivers/video/rockchip/hdmi/rk_hdmi.h

Find the line

int    audio_num;

and immediately after add:

int        base_audio_support;

2. Open file drivers/video/rockchip/hdmi/hdmi_edid.c

Find the following line and comment it out.

hdmi_edid_debug("[EDID-CEA] ddc_offset %d underscan_support %d baseaudio_support %d yuv_support %d native_dtd_num %d\n", ddc_offset, underscan_support, baseaudio_support, yuv_support, native_dtd_num);

and imediattly after add:

       pedid->base_audio_support = baseaudio_support;

3 Open drivers/video/rockchip/hdmi/hdmi_lcdc.c

Find the following two lines and comment them out.

dev_err(hdmi->dev, "warning: EDID error, assume sink as DVI !!!!"); 
hdmi->edid.sink_hdmi = 0;

And immediately after add:

  dev_err(hdmi->dev, "warning: EDID error, assume sink as HDMI!!!!"); 
  hdmi->edid.sink_hdmi = 1; 
  hdmi->edid.base_audio_support = 1;

Thats it... Now you should get sound....

[scooter2014]

Awsome work yet again Smic this will help alot of users! Well done.

[PolloLoco]

Awsome work yet again Smic this will help alot of users! Well done.

Smic's kernel for the MK809III worked wonderfully with my Motorola Lapdock. It's the first and only kernel to give me audio out on a kitkat ROM.

[helloben1980]

Which github source do you use?
You just set base_audio_support, but where does it be used?

On KitKat, some TV you may get sound from HDMI, this is not a fault actually is feature of the SOC. Basically your unit tries to communicate with the TV and if the TV does not reply back in a certain time the unit assume you are connecting to a DVI monitor rather than a TV so it cuts the sound.

I looked around and I count find a solution and at the request of some members I spent one night trying to fix this issue and in the end I fix it and decide to share the findings with the community, maybe somebody else can benefit from them.

If there is a easier way I don’t know. If it helped you let me know.

1. Open file drivers/video/rockchip/hdmi/rk_hdmi.h

Find the line

int    audio_num;

and immediately after add:

int        base_audio_support;

2. Open file drivers/video/rockchip/hdmi/hdmi_edid.c

Find the following line and comment it out.

hdmi_edid_debug("[EDID-CEA] ddc_offset %d underscan_support %d baseaudio_support %d yuv_support %d native_dtd_num %d\n", ddc_offset, underscan_support, baseaudio_support, yuv_support, native_dtd_num);

and imediattly after add:

       pedid->base_audio_support = baseaudio_support;

3 Open drivers/video/rockchip/hdmi/hdmi_lcdc.c

Find the following two lines and comment them out.

dev_err(hdmi->dev, "warning: EDID error, assume sink as DVI !!!!"); 
hdmi->edid.sink_hdmi = 0;

And immediately after add:

  dev_err(hdmi->dev, "warning: EDID error, assume sink as HDMI!!!!"); 
  hdmi->edid.sink_hdmi = 1; 
  hdmi->edid.base_audio_support = 1;

Thats it... Now you should get sound....

[smic717394]

I use RK3188_R-BOX_ANDROID, the base_audio_support is use by RK hdmi driver I think since 3066. What git you have? cant you find the lines in hdmi_edid.c, rk_hdmi.h, hdmi_lcdc.c. Strange it could be called diferent in your sdk, just look at the code and see how they define the default basic sound

[helloben1980]

I use https://github.com/linux-rockchip/ke...ip-3.0-rbox-kk
what's your git url?

I use RK3188_R-BOX_ANDROID, the base_audio_support is use by RK hdmi driver I think since 3066. What git you have? cant you find the lines in hdmi_edid.c, rk_hdmi.h, hdmi_lcdc.c. Strange it could be called diferent in your sdk, just look at the code and see how they define the default basic sound

[smic717394]

I use https://github.com/linux-rockchip/ke...ip-3.0-rbox-kk
what's your git url?

I use a private SDk and I promised that I wouldn't make it public or next time they will not provide it for me. But I look at the code from yours and Its fine, you have the new drivers, just look for the code and replace it, easy peasy.

[plightsup]

Cool...thx a lot.
I have seen many roms suffering from this issue.

[d33]

I looked around and I count find a solution and at the request of some members I spent one night trying to fix this issue and in the end I fix it and decide to share the findings with the community, maybe somebody else can benefit from them.

Excellent, are you okay with me using this in my builds?

[smic717394]

Re: RK3188 No HDMI Sound on KitKat on some TVs FIX !!!

Excellent, are you okay with me using this in my builds?

sure men, its all yours.

[mo123]

Get the following error with https://github.com/linux-rockchip/ke...ip-3.0-rbox-kk

drivers/video/rockchip/hdmi/hdmi-edid.c: In function ‘hdmi_edid_parse_extensions_cea’:
drivers/video/rockchip/hdmi/hdmi-edid.c:277:30: error: ‘baseaudio_support’ undeclared (first use in this function)
  pedid->base_audio_support = baseaudio_support;

[smic717394]

Re: RK3188 No HDMI Sound on KitKat on some TVs FIX !!!

Get the following error with https://github.com/linux-rockchip/ke...ip-3.0-rbox-kk

drivers/video/rockchip/hdmi/hdmi-edid.c: In function ‘hdmi_edid_parse_extensions_cea’:
drivers/video/rockchip/hdmi/hdmi-edid.c:277:30: error: ‘baseaudio_support’ undeclared (first use in this function)
  pedid->base_audio_support = baseaudio_support;

The line that actually changes DVI to HDMI is hdmi->edid.sink_hdmi = 1; but the base support was also use in JB so I would use it even it it looks like its no longer need it.

You get this errors, because in some SDKs the baseaudio_support is not defined or its been commented out. So open rk_hdmi_edid.c and find this lines and uncomment the lines as bellow.

around line 255 you have, uncomment this line:
//unsigned int underscan_support, baseaudio_support;

Change to:
unsigned int underscan_support, baseaudio_support;
also around line 270 you have
//baseaudio_support = (buf[3] >> 6) & 0x01;

Change to:
baseaudio_support = (buf[3] >> 6) & 0x01;

[d33]

RK3188 No HDMI Sound on KitKat on some TVs FIX !!!

As SMIC says you need to declare it first. It was commented out in my source


Sent from my iPhone using Tapatalk

[Stainy]

RK3188 No HDMI Sound on KitKat on some TVs FIX !!!

Is this to fix the sound resorting to something when you reboot?
I have to turn the sound on when I reboot on my mk802iv


Sent from my iPad using Tapatalk HD

[prahjister]

Awesome

It was driving me nuts....Thank you.