ST7789V not working

[devikaesd]

I'm using ST7789V display with 4.9.41 Kernel. My DTS file looks like this.

&spi1 
{
     status = "okay";
     pinctrl-names = "default";
     pinctrl-0 = <&myspi1_pins_default>;
     ti,spi-num-cs = <2>;
     ti,pindir-d0-out-d1-in = <1>;
     #address-cells = <1>;
     #size-cells = <0>;   

         spidev@0
        {

          compatible = "sitronix,st7789v";
          buswidth = <0x8>;
          //spi-3wire = <0x01>;
          spi-max-frequency = <2800000>;
          reg = <0x481a0000 0x400>;
          dc-gpios = <&gpio0 7 0>;
          reset-gpios = <&gpio3 8 0>;   
                };
};

All pins looks fine, I'm able to see data, clk, cs, dc pins but not reset pins. And LCD only blinks when I'm sending some data.

I have configured for 8 bits 3-wire. For 3-wire I have shorted MOSI and MISO pins with 10K.

Any suggestion, what I'm missing in DTS file to make reset work and make my display up.

Edit: Add codetags to DTS snippet

[notro]

reg = <0x481a0000 0x400>;

This should be the chip select number.

Is your spi device registered?

pi@pi2835:~$ ls -l /sys/bus/spi/devices/
total 0
lrwxrwxrwx 1 root root 0 Apr  6 15:15 spi0.0 -> ../../../devices/platform/soc/20204000.spi/spi_master/spi0/spi0.0
lrwxrwxrwx 1 root root 0 Apr  6 15:15 spi0.1 -> ../../../devices/platform/soc/20204000.spi/spi_master/spi0/spi0.1

This will show if the driver is loaded: dmesg | grep 'frame buffer'

[waelabd]

@devikaesd have you resolved this issue?

[devikaesd]

Yes..it got solved..

I configured regular 4Wire SPI for that.

But in device tree you need to specify one pin and one pin as out.

Your's Sincere

On Mon, 8 Jun 2020, 9:06 p.m. Wael aboudahr, notifications@github.com wrote:

@devikaesd https://github.com/devikaesd have you resolved this issue?

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[temoto]

@devikaesd please please share final working dts.

[wamanprabhu]

myspi1_pins_default: myspi1_pins_default {
pinctrl-single,pins = <
    0x190 ( PIN_INPUT | MUX_MODE3 ) /* (A13) mcasp0_aclkx.spi1_sclk */
    0x194 ( PIN_INPUT | MUX_MODE3 ) /* (B13) mcasp0_fsx.spi1_d0 */
    0x198 ( PIN_INPUT | MUX_MODE3 ) /* (D12) mcasp0_axr0.spi1_d1 */
            /*Below line was modified from */
            //0x164 ( PIN_INPUT | MUX_MODE2 ) /* (C18) eCAP0_in_PWM0_out.spi1_cs1 */
            //to
    0x19c ( PIN_INPUT | MUX_MODE3 ) /* (C12) mcasp0_ahclkr.spi1_cs0 */
>;

&spi1 { status = "okay"; pinctrl-names = "default"; pinctrl-0 = <&myspi1_pins_default>; ti,spi-num-cs = <2>; ti,pindir-d0-out-d1-in = <1>;

address-cells = <1>;

 #size-cells = <0>;   

     spidev@0{
              compatible = "sitronix,st7789v";
      buswidth = <0x8>;
      //spi-3wire = <0x01>;
      spi-max-frequency = <12000000>;
      reg = <0x481a0000 0x400>;
      reset-gpios = <&gpio3 8 0>;
      dc-gpios = <&gpio0 7 0>;
            };

};

Hope this help

[temoto]

FYI for ST7789 to display colors correctly, driver must contain this patch, merged into Linux since 5.8: https://github.com/torvalds/linux/commit/f03c9b7884720973d1673fbb64f808897ca88a12 Armbian has just accepted to apply this patch when building any kernel version.

Here's our working dts file for Orange Pi Lite:

/dts-v1/;
/plugin/;

/ {
        compatible = "allwinner,sun8i-h3";

        fragment@0 {
                target = <&spi0>;
                __overlay__ {
                        #address-cells = <1>;
                        #size-cells = <0>;
                        pinctrl-names = "default", "default";
                        pinctrl-1 = <&spi0_cs1>;
                        cs-gpios = <0>, <&pio 0 20 0>;

// NOTE irrelevant for display config, but we use spidev concurrently with chip select and it works
                        spidev@0 {
                                compatible = "spidev";
                                reg = <0>;
                                status = "okay";
                                spi-max-frequency = <16000000>;
                        };

                        st7789v@1 {
                                compatible = "sitronix,st7789v";
                                reg = <1>; // NOTE SPI chip select number
                                pinctrl-1 = <&st7789v_pins>;
                                spi-max-frequency = <32000000>;
                                spi-cpol;
                                spi-cpha;
                                rotate = <90>; // NOTE 90/270 for horizontal orientation
                                fps = <25>;
                                buswidth = <8>;
                txbuflen = <16384>; // NOTE supposed to speed up overall transfer and make SPI device more available for other uses
                                // NOTE obviously your pins will vary but last 0 or GPIO_ACTIVE_HIGH is important
                                reset-gpios = <&pio 0 10 0>;
                                dc-gpios = <&pio 0 9 0>;
                                led-gpios = <&pio 0 8 0>;
                                debug = <0>; // NOTE high value like 9 will print lots of debug info to dmesg
                        };
                };
        };

        fragment@1 {
                target = <&pio>;
                __overlay__ {
                        spi0_cs1: spi0_cs1 {
                                pins = "PA20";
                                function = "gpio_out";
                                output-high;
                        };

                        st7789v_pins: st7789v_pins {
                                pins = "PA8", "PA9", "PA10";
                                function = "gpio_out", "gpio_out", "gpio_out";
                        };
                };
        };

};

@notro thank you for your hard work. Have a great time.

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[tuanphan1790]

Hi,

I'm troubling with ST7789V controller. My LCD is using RGB interface for transfer data and SPI for config LCD. But it's not work.

In the initialize, st7789v_probe func is success but st7789v_prepare func return -92 when send data over SPI meaning transfer failed

my device tree: /****/

spi0: spi@400 { compatible = "microchip,sam9x60-spi", "atmel,at91rm9200-spi"; reg = <0x400 0x200>; interrupts = <13 IRQ_TYPE_LEVEL_HIGH 7>; clocks = <&pmc PMC_TYPE_PERIPHERAL 13>; clock-names = "spi_clk"; pinctrl-names = "default"; pinctrl-0 = <&pinctrl_flx4_default>; atmel,fifo-size = <16>;

address-cells = <1>;

            #size-cells = <0>;

            status = "okay";

            lcd@0 {
                compatible = "sitronix,st7789v";
                reg = <0>;
                spi-max-frequency = <10000000>;
                rotate = <270>;
                bgr;
                fps = <50>;
                buswidth = <8>;
                reset-gpios= <&pioA 2 0>;
                dc-gpios = <&pioA 4 0>;
                spi-cpol;
                spi-cpha;
                status = "okay";
            };

/****/

Does anyone help me?