Linux/AM5728: OSD070T2649-19TS LCD Porting

Hi Manish,

Thanks for the reply.

I have enabled the default driver panel-dpi and its getting probed.

With the below dts configuration, Backlight of the LCD is enabled in my device.

        aliases {
                display0 = &lcd;
                display1 = &hdmi0;
        };

        lcd: display {
                compatible = "osddisplays,osd070t2649-19ts", "panel-dpi";

                label = "lcd";

                backlight = <&lcd_bl>;

                enable-gpios = <&gpio2 5 GPIO_ACTIVE_HIGH>;

                panel-timing {

                        clock-frequency = <33000000>;
                        hactive = <800>;
                        vactive = <480>;
                        hfront-porch = <210>;
                        hback-porch = <16>;
                        hsync-len = <30>;
                        vback-porch = <10>;
                        vfront-porch = <22>;
                        vsync-len = <13>;
                        hsync-active = <0>;
                        vsync-active = <0>;
                        de-active = <1>;
                        pixelclk-active = <1>;

                };

                port {
                        lcd_in: endpoint {
                                remote-endpoint = <&dpi_out>;
                        };
                };
        };

        vmmcwl_fixed: fixedregulator-mmcwl {
                compatible = "regulator-fixed";
                regulator-name = "vmmcwl_fixed";
                regulator-min-microvolt = <1800000>;
                regulator-max-microvolt = <1800000>;
                gpio = <&gpio5 8 GPIO_ACTIVE_HIGH>;
                enable-active-high;
        };
};

&dss {
        status = "okay";
        ports {
                #address-cells = <1>;
                #size-cells = <0>;

                port {
                        reg = <0>;

                        dpi_out: endpoint {
                                remote-endpoint = <&lcd_in>;
                                data-lines = <24>;
                        };
                };
        };
};

&epwmss1 {
        status = "okay";
};

&ehrpwm1 {
        status = "okay";
};

But I can see only brightness in screen. I didnt get the boot logo and login prompt detail in lcd.

Below mentioned the fbset command details.

root@am57xx-evm:~# fbset  

mode "800x480-0"
        # D: 0.000 MHz, H: 0.000 kHz, V: 0.000 Hz
        geometry 800 480 800 480 32
        timings 0 0 0 0 0 0 0
        accel true
        rgba 8/16,8/8,8/0,0/0
endmode

root@am57xx-evm:~#

In this, LCD mode has configured perfectly, But clock frequency and timing sections are ZEROs.

I can able to control the framebuffer console blanks using this command

root@am57xx-evm:/# echo 0 > ./sys/class/graphics/fb0/blank   //enabling                                                                                                                                                        
root@am57xx-evm:/#
root@am57xx-evm:/# echo 1 > ./sys/class/graphics/fb0/blank  //disbling

I tried dumping image into framebuffer. cat 800*400.jpg > /dev/fb0

But no effect in LCD.

Please provide me the feedback.

Adding Data sheet timing information

Hi,

Our DSS driver don't use fbdev but drm. The fb layer with DRM is just a thin emulation, so it doesn't print any timing information. Please try kmstest.

Please check if your panel needs GPIO enable, or  anything such.

I will recommend you to probe the VOUTs pins and LCD panel input pins signals and see which one is creating problem.

Regards,

Manisha

Hi Manisha,

Thanks for the reply. Below is the result of kmstest

root@am57xx-evm:~# kmstest

trying to open device 'i915'...failed

trying to open device 'radeon'...failed

trying to open device 'nouveau'...failed

trying to open device 'vmwgfx'...failed

trying to open device 'omapdrm'...done

main: All ok!

root@am57xx-evm:~#

root@am57xx-evm:~#

Is it initialized properly ?

You should expect to see something on below line as a part of kmstest

root@am57xx-evm:~# kmstest
Connector 0/@35: HDMI-A-1
Crtc 0/@39 (plane 0/@36): 1920x1080 148.500 1920/88/44/148 1080/4/5/36 60 (60.00) 0x5 0x48
Fb 55 1920x1080-XR24

Did you probe the signals as I asked in previous post?

Hi Manisha,

PMIC of my board has got damaged. Sorry for the late reply.

I have verified my LCD power supply unit. All the VGH, VGL, AVDD, VDD is fine according to design.


Can you please tell me the PCLK frequency according to the EVM design. Let me check the PCLK and update you.

I m using zImage-am57xx-evm.dtb renamed to am57xx-beagle-x15.dtb since my board defaultly accessing beagle-x15.

CPU  : DRA752-GP ES2.0
Model: TI AM5728 IDK
Board: UNKNOWN(BeagleBoard X15?) REV UNKNOWN

There are some lcd related dtb files too. May i know the EVM specific dtb file ?

Karthikeyan R said:

I m using zImage-am57xx-evm.dtb renamed to am57xx-beagle-x15.dtb since my board defaultly accessing beagle-x15.

CPU  : DRA752-GP ES2.0
Model: TI AM5728 IDK
Board: UNKNOWN(BeagleBoard X15?) REV UNKNOWN

I am little lost with your hardware and software setup in above comment. Which EVM are you using from TI? The beagle-X15 board is not supported by processor SDK Linux.  The software version you mentioned is Processor-sdk-04.02.00.09. That's a year old  old version. I will recommend you to move to latest version of the software.

Regards,

Manisha