I am wondering how I can merge two 4-lanes (8 lanes) on the TX2 Developer Carrier Board for the 4K HDMI input (HDMI2CSI). I read the spec as well as technical reference. But I don’t know how to use CSIMUX or merge CSI lanes to set the registers on the board. Thanks.
hello ysjeong,
may I know which JetPack release you’re currently working with.
you should check below kernel sources to parse 8-lane device tree settings and also the configuration.
<i>$l4t-r32.1/kernel_src/kernel/nvidia/drivers/media/platform/tegra/camera/vi/graph.c</i>
int tegra_vi_get_port_info(struct tegra_channel *chan, struct device_node *node, unsigned int index)
{...}
you might also check TC358840 bridge driver as below for more details.
thanks
$l4t-r32.1/kernel_src/kernel/nvidia/drivers/media/i2c/tc358840.c
$l4t-r32.1/kernel_src/hardware/nvidia/platform/t18x/quill/kernel-dts/quill-modules/tegra186-camera-imx274.dtsi
Thank you. I am working with JetPack-L4T-3.2.1.
Where I should change the code on graph.c/tegra186-camera-imx274.dtsi to use 8-lanes?
hello ysjeong,
you should define the 8-lane configuration in your sensor device tree.
kernel driver will parse the settings and choose gang mode to handle a 8-lane device.
thanks
Hi, JerryChang. Thanks.
Maybe the below code(tegra186-quill-p3310-1000-c03-00-base-hdmi2csi.dts) is what you mentioned.
Do I have to fix this code to adjust something like HDMI input sync?
i2c@3180000 {
status = “okay”;
#address-cells = <1>;
#size-cells = <0>;
/* HDMI IN A (4K) */
tc358840@0f {
compatible = "toshiba,tc358840";
reg = <0x0f>;
status = "okay";
devnode = "video0";
/* Power Supply */
vdig-supply = <&en_vdd_cam_1v2>;
vif-supply = <&en_vdd_cam>;
/* Reset */
reset-gpios = <&tegra_main_gpio TEGRA_MAIN_GPIO(R, 5) GPIO_ACTIVE_LOW>;
/* Interrupt */
interrupt-parent = <&tegra_main_gpio>;
interrupts = <TEGRA_MAIN_GPIO(R, 0) IRQ_TYPE_LEVEL_HIGH>;
refclk_hz = <48000000>; /* 40 - 50 MHz */
ddc5v_delay = <1>; /* 50 ms */
/* HDCP */
/* TODO: Not yet implemented */
enable_hdcp = <0>;
/* CSI Output */
/* Enable TX0 (4 lanes) & TX1 (4 lanes) */
csi_port = <3>;
lineinitcnt = <0x00000FA0>;
lptxtimecnt = <0x00000004>;
tclk_headercnt = <0x00180203>;
tclk_trailcnt = <0x00040005>;
ths_headercnt = <0x000D0004>;
twakeup = <0x00003E80>;
tclk_postcnt = <0x0000000A>;
ths_trailcnt = <0x00080006>;
hstxvregcnt = <0x00000020>;
/* PLL */
/* Bps per lane is (refclk_hz / pll_prd) * pll_fbd */
pll_prd = <10>;
pll_fbd = <125>;
port@0 {
ret = <0>;
hdmi2csi_tc358840_out0: endpoint {
csi-port = <0>;
bus-width = <8>;
remote-endpoint = <&hdmi2csi_csi_in0>;
};
};
};
hello ysjeong,
please create a sensor device tree for your customize device.
please check tutorials page and refer to [V4L2 Sensor Driver Development Tutorial] for implementation hands-on video.
you may also refer to Sensor Driver Programming Guide for the details.
thanks
Hi,Jerry .In tutorials page,can’t find [V4L2 Sensor Driver Development Tutorial]
hello sunzhongmeng,
there’re several tutorial files.
you’ll need to expand [DEVELOPER TOOLS] block, and click [+SHOW MORE] to browse all contents.
thanks
thank you，I got it.