DRA726: LCD colors

Hi Michael,

If the same binary, which was working on earlier LCD, is stopped working, it seems something in the LCD. Are you sure the new LCD supports same format/interface/resolution etc.?

Regards,

Brijesh

Brijesh,

The touch screen device is different version of egalax. I had to modify the kernel module to support the 8k since 4k wasn't supported.

Since the LCD is different I had to modify the devicetree for the frequency used and the

Old LCD

        lcd0: display {
        compatible = "panel-dpi";

                label = "lcd0";

        backlight = <&lcd_bl>;

                panel-timing {
                        clock-frequency = <66800000>;
                        hactive = <800>;
                        vactive = <1280>;
                        hfront-porch = <51>;
                        hback-porch = <10>;
                        hsync-len = <3>;
                        vback-porch = <2>;
                        vfront-porch = <4>;
                        vsync-len = <2>;
                        hsync-active = <0>;
                        vsync-active = <0>;
                        de-active = <1>;
                        pixelclk-active = <1>;
                };

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

New LCD

        lcd0: display {
        compatible = "panel-dpi";

                label = "lcd0";

        backlight = <&lcd_bl>;

                panel-timing {
                        clock-frequency = <71900000>;
                        hactive = <1280>;
                        vactive = <800>;
                        hfront-porch = <139>;
                        hback-porch = <5>;
                        hsync-len = <1>;
                        vback-porch = <2>;
                        vfront-porch = <40>;
                        vsync-len = <1>;
                        hsync-active = <0>;
                        vsync-active = <0>;
                        de-active = <1>;
                        pixelclk-active = <1>;
                };

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

Is there a way to adjust the hue for a particular color?  On the previous design I was able to swap red and blue as there was a hardware error.

Michel Catudal

ACTIA Corp

Hi Michael,

Unfortunately, hue cannot be controlled in DSS. 

As such parameters look fine 

Regards,

Brijesh