i.MX ProcessorsのトピックRe: hdmi mxc_cec_test.out function is not working

hdmi mxc_cec_test.out function is not working

weikeng-jimmy — Thu, 07 Nov 2013 07:52:06 GMT

Hi SIr,

We would test HDMI CEC function. I open the Device Drivers > MXC HDMI CEC support.
We would use mxc_cec_test.out to get version and poweroff TV. But nothing is happen.
The message as below.

./mxc_cec_test.out
Start CEC testing!
sleep for ready!
Try to get CEC Version !
-------------------------> Power off TV <-----------------------
end of test!

My BSP is L3.0.35.4.1 . Test environment is Sabre-SD board.

Can you help me how to use the test function ! Thanks!

Re: hdmi mxc_cec_test.out function is not working

jimmychan — Wed, 13 Nov 2013 03:14:44 GMT

mxc_cec_test is not a complete code.

Re: hdmi mxc_cec_test.out function is not working

weikeng-jimmy — Wed, 13 Nov 2013 06:17:32 GMT

Hi JIMMY,

According to "i.MX_6Dual6Quad_Linux_Reference_Manual.pdf" comes along with 4.1.0 Linux BSP-docs for MX6Q, in "chapter 11 HDMI", page 102, it said "$/unit_test/mxc_cec_test" can be used to simple verify HDMI CEC function, and it also said HDMI CEC will send Poweroff command to HDMI sink after execute the command.

This is really confusing, can "mxc_cec_test" do what it said in BSP reference manual? Or it's not a complete code?(so what's the purpose of this test command?) Could you please escalate this item to AE/R&D?

Re: hdmi mxc_cec_test.out function is not working

YixingKong — Wed, 13 Nov 2013 06:25:44 GMT

Jimmy, it is suggestive that you ask the customer to create DI next time in i.MX Community where the information could be shared by everyone.

Regards,

Yixing

Re: hdmi mxc_cec_test.out function is not working

qiang_li-mpu_se — Fri, 15 Nov 2013 07:00:08 GMT

Default, the HDMI CEC was not enabled in kernel, you need enable it first in imx6_defconfig:

# MXC HDMI CEC (Consumer Electronics Control) support

# CONFIG_MXC_HDMI_CEC is not set

And you also need make sure the TV supports HDMI CEC.

Re: hdmi mxc_cec_test.out function is not working

yuming_lin — Fri, 15 Nov 2013 08:07:56 GMT

Hi Yixing Kong:

I am following the issue always. Please help to check it.

Thanks~

Yuming

Re: hdmi mxc_cec_test.out function is not working

weikeng-jimmy — Fri, 15 Nov 2013 08:15:14 GMT

Hi Qiang,

My kernel had CEC config setting as below.

# MXC HDMI CEC (Consumer Electronics Control) support

CONFIG_MXC_HDMI_CEC=y

And I found the CEC waveform not match HDMI-CEC spec. The HDMI CEC spec describe the start bit must be 3.5 ~ 3.9 ms . But we are only 2.793 ms.

The attachment file is imx6 CEC waveform.

Re: hdmi mxc_cec_test.out function is not working

qiang_li-mpu_se — Mon, 25 Nov 2013 09:06:06 GMT

Hi Jimmy, did you measure it on SabreSD or customer's board?

From HDMI side, I haven't found any setting to adjust this timing.

Re: hdmi mxc_cec_test.out function is not working

qiang_li-mpu_se — Mon, 25 Nov 2013 10:23:07 GMT

Hi Jimmy, on SabreSD, we had measured the CEC signal, the start bit is about 3.6ms, which board are you used for the test?

Can you attach detail waveform?

Re: hdmi mxc_cec_test.out function is not working

weikeng-jimmy — Tue, 10 Dec 2013 06:38:39 GMT

My BSP is Linux version L3.0.35_4.1.0 And test platform is Sabre-SD board.
The attach file is waveform for first command. --> Try to get CEC Version !

Re: hdmi mxc_cec_test.out function is not working

qiang_li-mpu_se — Thu, 02 Jan 2014 06:06:24 GMT

I'm not sure where there will be different result in your side and my side, do you check on other SabreSD board?

Re: hdmi mxc_cec_test.out function is not working

YixingKong — Thu, 02 Jan 2014 06:18:17 GMT

Jimmy, this DI had been closed. If you still have questions please let me know.

Regards,

Yixing

Re: hdmi mxc_cec_test.out function is not working

weikeng-jimmy — Fri, 03 Jan 2014 09:28:00 GMT

Can you give me your workable SDP board version ?

My SDP number : SCH27392 REV C3