ecspi1 write data slow

brli — Thu, 25 Apr 2019 08:55:33 GMT

Hi,

We connect one 240*320 SPI interface LCD to ecspi1 and developed it's driver on Yocto BSP.

It can display UI now, but flash frame rate is very slow.

could you suggest how to improve spi speed? thanks!

Here is its DTS config

&ecspi1 {
compatible = "fsl,imx6q-ecspi", "fsl,imx51-ecspi";
fsl,spi-num-chipselects = <1>;
cs-gpios = <&gpio4 9 0>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_ecspi1>;
status = "okay";
lcd:startek@0 {
compatible = "startek,startek-lcd";
#address-cells = <1>;
#size-cells = <1>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_ecspi1_rest>;
spi-max-frequency = <20000000>;
rest-gpios = <&gpio6 11 GPIO_ACTIVE_HIGH>;
rs-gpios = <&gpio4 8 GPIO_ACTIVE_LOW>;
reg = <0>;
};
};

Re: ecspi1 write data slow

igorpadykov — Thu, 25 Apr 2019 23:31:59 GMT

Hi br

one can try to use dma, as in ecspi5 example :

imx6q.dtsi\dts\boot\arm\arch - linux-imx - i.MX Linux kernel

also one can try to increase burst size using BURST_LENGTH register ECSPIx_CONREG.

Best regards
igor
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