{"type":"doc","content":[{"type":"paragraph","content":[{"text":"Since 3.x kernel version in order to set a different LVDS panel resolution a device tree file modification is required.","type":"text"}]},{"type":"paragraph","content":[{"text":"The file which should be modified is ","type":"text"},{"text":"arch/arm64/boot/dts/imx8qxp-qx8x.dtsi","type":"text","marks":[{"type":"em"}]},{"text":" under the kernel root folder, into ","type":"text"},{"text":"&ldb1","type":"text","marks":[{"type":"em"}]},{"text":" section, in particular ","type":"text"},{"text":"display-timings","type":"text","marks":[{"type":"em"}]}]},{"type":"paragraph","content":[{"text":"

","type":"text"},{"type":"hardBreak"},{"text":"

The default version looks like this ","type":"text"},{"text":"(click here)","type":"text","marks":[{"type":"em"}]},{"text":"

","type":"text"}]},{"type":"codeBlock","attrs":{"language":"shell"},"content":[{"text":"&ldb1 {\n status = \"okay\";\n\n lvds-channel@0 {\n fsl,data-mapping = \"spwg\";\n fsl,data-width = <18>;\n primary;\n status = \"okay\";\n\n display-timings {\n native-mode = <&timing0>;\n timing0: hsd100pxn1 {\n clock-frequency = <65000000>;\n hactive = <1024>;\n vactive = <768>;\n hback-porch = <220>;\n hfront-porch = <40>;\n vback-porch = <21>;\n vfront-porch = <7>;\n hsync-len = <60>;\n vsync-len = <10>;\n };\n };\n };\n\n lvds-channel@1 {\n fsl,data-mapping = \"spwg\";\n fsl,data-width = <18>;\n status = \"okay\";\n\n display-timings {\n native-mode = <&timing1>;\n timing1: hsd100pxn1 {\n clock-frequency = <65000000>;\n hactive = <1024>;\n vactive = <768>;\n hback-porch = <220>;\n hfront-porch = <40>;\n vback-porch = <21>;\n vfront-porch = <7>;\n hsync-len = <60>;\n vsync-len = <10>;\n };\n };\n };\n};","type":"text"}]},{"type":"paragraph","content":[{"text":"

","type":"text"}]},{"type":"paragraph","content":[{"text":"Check if the panel is 18 or 24 bit, and change fsl,data-width = <18>; if needed.","type":"text"}]},{"type":"paragraph","content":[{"text":"As an example here you can find values for some different resolutions","type":"text"}]},{"type":"paragraph","content":[{"text":"

","type":"text"},{"type":"hardBreak"},{"text":"

800x480 ","type":"text"},{"text":"(click here)","type":"text","marks":[{"type":"em"}]},{"text":"

","type":"text"}]},{"type":"codeBlock","attrs":{"language":"shell"},"content":[{"text":" clock-frequency = <33000000>;\n hactive = <800>;\n vactive = <480>;\n hback-porch = <56>;\n hfront-porch = <50>;\n vback-porch = <20>;\n vfront-porch = <53>;\n hsync-len = <180>;\n vsync-len = <30>;","type":"text"}]},{"type":"paragraph","content":[{"text":"

","type":"text"}]},{"type":"paragraph","content":[{"text":"

","type":"text"},{"type":"hardBreak"},{"text":"

800x600 ","type":"text"},{"text":"(click here)","type":"text","marks":[{"type":"em"}]},{"text":"

","type":"text"}]},{"type":"codeBlock","attrs":{"language":"shell"},"content":[{"text":" clock-frequency = <40000000>; \n hactive = <800>;\n vactive = <600>;\n hfront-porch = <88>;\n hback-porch = <72>;\n hsync-len = <64>; \n vback-porch = <15>; \n vfront-porch = <4>; \n vsync-len = <6>; \n hsync-active = <2>;\n vsync-active = <2>;","type":"text"}]},{"type":"paragraph","content":[{"text":"

","type":"text"}]},{"type":"paragraph","content":[{"text":"

","type":"text"},{"type":"hardBreak"},{"text":"

1024x600 ","type":"text"},{"text":"(click here)","type":"text","marks":[{"type":"em"}]},{"text":"

","type":"text"}]},{"type":"codeBlock","attrs":{"language":"shell"},"content":[{"text":" clock-frequency = <45000000>;\n hactive = <1024>;\n vactive = <600>;\n hback-porch = <50>;\n hfront-porch = <50>;\n vback-porch = <10>;\n vfront-porch = <10>;\n hsync-len = <76>;\n vsync-len = <5>;","type":"text"}]},{"type":"paragraph","content":[{"text":"

","type":"text"}]},{"type":"paragraph","content":[{"text":"

","type":"text"},{"type":"hardBreak"},{"text":"

1024x768 ","type":"text"},{"text":"(click here)","type":"text","marks":[{"type":"em"}]},{"text":"

","type":"text"}]},{"type":"codeBlock","attrs":{"language":"shell"},"content":[{"text":" clock-frequency = <65000000>;\n hactive = <1024>;\n vactive = <768>;\n hback-porch = <220>;\n hfront-porch = <40>;\n vback-porch = <21>;\n vfront-porch = <7>;\n hsync-len = <60>;\n vsync-len = <10>;\n vsync-len = <4>;","type":"text"}]},{"type":"paragraph","content":[{"text":"

","type":"text"}]},{"type":"paragraph","content":[{"text":"

","type":"text"},{"type":"hardBreak"},{"text":"

1280x800 ","type":"text"},{"text":"(click here)","type":"text","marks":[{"type":"em"}]},{"text":"

","type":"text"}]},{"type":"codeBlock","attrs":{"language":"shell"},"content":[{"text":" clock-frequency = <71000000>;\n hactive = <1280>;\n vactive = <800>;\n hback-porch = <40>;\n hfront-porch = <40>;\n vback-porch = <10>;\n vfront-porch = <3>;\n hsync-len = <80>;\n vsync-len = <10>;","type":"text"}]},{"type":"paragraph","content":[{"text":"

","type":"text"}]},{"type":"paragraph","content":[{"text":"

","type":"text"},{"type":"hardBreak"},{"text":"

1368x768 ","type":"text"},{"text":"(click here)","type":"text","marks":[{"type":"em"}]},{"text":"

","type":"text"}]},{"type":"codeBlock","attrs":{"language":"shell"},"content":[{"text":" clock-frequency = <72000000>;\n hactive = <1368>;\n vactive = <768>;\n hback-porch = <93>;\n hfront-porch = <33>;\n vback-porch = <22>;\n vfront-porch = <7>;\n hsync-len = <40>;\n vsync-len = <4>;","type":"text"}]},{"type":"paragraph","content":[{"text":"

","type":"text"}]},{"type":"paragraph","content":[{"text":"

","type":"text"},{"type":"hardBreak"},{"text":"

1920x1050 ","type":"text"},{"text":"(click here)","type":"text","marks":[{"type":"em"}]},{"text":"

","type":"text"}]},{"type":"codeBlock","attrs":{"language":"shell"},"content":[{"text":" clock-frequency = <110000000>;\n hactive = <1920>;\n vactive = <1050>;\n hback-porch = <40>;\n hfront-porch = <80>;\n vback-porch = <15>;\n vfront-porch = <15>;\n hsync-len = <40>;\n vsync-len = <5>;","type":"text"}]},{"type":"paragraph","content":[{"text":"

","type":"text"}]},{"type":"paragraph","content":[{"text":"

","type":"text"},{"type":"hardBreak"},{"text":"

1920x1080 ","type":"text"},{"text":"(click here)","type":"text","marks":[{"type":"em"}]},{"text":"

","type":"text"}]},{"type":"codeBlock","attrs":{"language":"shell"},"content":[{"text":" clock-frequency = <130000000>;\n hactive = <1920>;\n vactive = <1080>;\n hback-porch = <100>;\n hfront-porch = <40>;\n vback-porch = <30>;\n vfront-porch = <2>;\n hsync-len = <10>;\n vsync-len = <2>;","type":"text"}]},{"type":"paragraph","content":[{"text":"

","type":"text"}]},{"type":"paragraph","content":[{"text":"After saving the changes made into the device tree file, it should be recompiled and transferred to the target system (instructions under ","type":"text"},{"text":"Kernel standalone","type":"text","marks":[{"type":"link","attrs":{"href":"i.MX+8X+Kernel+standalone"}}]},{"text":")","type":"text"}]},{"type":"paragraph","content":[{"text":"Before plugging in the panel, the jumper settings on the conga-QEVAL/Qseven 2.0 should be properly set (X46, X47, X50).","type":"text"},{"type":"hardBreak"},{"text":"Also is highly recommendable measure the signals on connector X41","type":"text"}]},{"type":"bulletList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"text":"Pin 16: 1st channel clock","type":"text"}]}]},{"type":"listItem","content":[{"type":"paragraph","content":[{"text":"Ping 30: 2nd channel clock","type":"text"}]}]}]}],"version":1}