topic Re: LCD preview issue after HDMI Display start in i.MX Processors

LCD preview issue after HDMI Display start

jignesh1 — Mon, 19 Sep 2016 07:26:01 GMT

Hi all,

We are using imx6q processor with TM050RVHG01-00 LCD and using kernel version : 3.14.28 .

We have following issue.

1. After booting system, if we run LCD preview then it is correct as you find in attachment.

2. After booting system, first we run HDMI preview and then LCD preview then LCD preview gets corrupted. This corrupted also found in attachment.

3. After booting system, if we start both LCD and HDMI preview together then also we face same issue.

Following is the device tree of our product. we are using mxcfb1 for LCD and mxcfb2 for HDMI. Let us know if we are missing anything to configure IPU.

        mxcfb1: fb@0 {
                compatible = "fsl,mxc_sdc_fb";
                disp_dev = "lcd";
                interface_pix_fmt = "RGB24";
                mode_str ="TM050RVHG01-00";
                default_bpp = <24>;
                int_clk = <0>;
                late_init = <0>;
                status = "okay";
        };

        mxcfb2: fb@1 {
                compatible = "fsl,mxc_sdc_fb";
                disp_dev = "hdmi";
                interface_pix_fmt = "RGB24";
                mode_str ="1920x1080M@60";
                default_bpp = <32>;
                int_clk = <0>;
                late_init = <0>;
                status = "okay";
        };

We are using standard V4L2 base application to get preview on LCD and HDMI. So let us know if you need application source code.

Thanks,

Jignesh R Patel

Re: LCD preview issue after HDMI Display start

jignesh1 — Mon, 26 Sep 2016 07:23:04 GMT

Hi All,

Please help me for this. One more information I got that when I start HDMI output then it show following message.

imx-ipuv3 2400000.ipu: IPU DMFC DC HIGH RESOLUTION: 1(0~3), 5B(4,5), 5F(6,7)

So after this message I do see issue on LCD.

Thanks,

Jignesh R Patel

Re: LCD preview issue after HDMI Display start

igorpadykov — Tue, 27 Sep 2016 00:06:40 GMT

Hi Jignesh

please try kernel boot parameter dmfc=3

Best regards
igor
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Re: LCD preview issue after HDMI Display start

jignesh1 — Tue, 27 Sep 2016 08:02:48 GMT

Hi Igor,

Thanks for reply. I set bootargs as you mention but I got worst display output at HDMI and LCD.

Please find LCD and HDMI preview snapshot in attachment.

Let me know if any setting I am missing.

Thanks,

Jignesh Patel

Re: LCD preview issue after HDMI Display start

igorpadykov — Tue, 27 Sep 2016 10:46:18 GMT

Hi Jignesh

please try to reproduce issue on nxp Sabre reference board.

Best regards
igor

Re: LCD preview issue after HDMI Display start

jignesh1 — Tue, 27 Sep 2016 11:40:34 GMT

Hi igor,

We do not have Sabre board. we have wand board but that does not support LCD. So please advice us if any alternative.

Default as I mention only LCD preview is working correct but issue start after I start HDMI preview. We have 800x480 resolution for LCD and 1920x1080 resolution for HDMI.

Thanks,

Jignesh Patel