topic Re: IMX6_ST7701s_MIPI_DSI_Display in i.MX Processors

IMX6_ST7701s_MIPI_DSI_Display

svnatraj — Thu, 18 Jul 2019 13:17:49 GMT

Am trying to Enable MIPI DSI display driver imx6 with linux kernel 4.1.15

i followed the NXP community to modify the following part in device tree file

aliases {

mxcfb0 = &mxcfb1;

};

reg_mipi_dsi_pwr_on: mipi_dsi_pwr_on {

compatible = "regulator-fixed";

regulator-name = "mipi_dsi_pwr_on";

gpio = <&gpio6 14 0>;

enable-active-high;

};

mipi_dsi_reset: mipi-dsi-reset {
compatible = "gpio-reset";
reset-gpios = <&gpio7 12 1>; //GPIO_ACTIVE_LOW
reset-delay-us = <50>;
#reset-cells = <0>;
};

&mipi_dsi {
dev_id = <0>;
disp_id = <0>;
lcd_panel = "TRULY-WVGA";
disp-power-on-supply = <&reg_mipi_dsi_pwr_on>;
resets = <&mipi_dsi_reset>;
status = "okay";
};

mxcfb1: fb@0 {

compatible = "fsl,mxc_sdc_fb";

disp_dev = "mipi_dsi";

interface_pix_fmt = "RGB565";

mode_str ="TRULY-WVGA";

default_bpp = <24>;

int_clk = <0>;

late_init = <0>;

status = "okay";

};

and am using LCD panel driver ST7701s..320X480

and i got the following three line of debug message regarding MIPI DSI

and nothing..

21e0000.mipi supply disp-power-on not found, using dummy regulator
mxc_mipi_dsi 21e0000.mipi: i.MX MIPI DSI driver probed
mxc_mipi_dsi mipi-phy: failed to get platform resource 0
MIPI DSI driver module loaded
mxc_sdc_fb fb@1: can not get alias id

Re: IMX6_ST7701s_MIPI_DSI_Display

igorpadykov — Thu, 18 Jul 2019 23:38:26 GMT

Hi Natarajan

one can try to adjust timings and initialization for specific lcd using

description in sect.6.4.2.2 Source Code Structure attached Linux Manual,

in driver: linux/drivers/video/fbdev/mxc/mxcfb_hx8369_wvga.c adjust
fb_videomode truly_lcd_modedb[], mipid_hx8369_lcd_setup()

mxcfb_hx8369_wvga.c\mxc\fbdev\video\drivers - linux-imx - i.MX Linux kernel

Best regards
igor
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Re: IMX6_ST7701s_MIPI_DSI_Display

svnatraj — Fri, 19 Jul 2019 13:38:37 GMT

Hi Igor

Thank you for your kind reply..

am using custom board. anyway never mind the ST7701 ...now just i want to enable hx8369 lcd driver through

mxcfb_hx8369_wvga.c
fb_videomode truly_lcd_modedb[],

mipid_hx8369_lcd_setup()

that driver come with BSP.

i never get any debug message from mipi_hx8369_lcd_setup()

function.. just i expect kernel debug message " LCD panel not Matched" something like that because

am using different LCD controller.. i guess mipi_hx8369_lcd_setup() function never called.

i receive only following debug message from kernel log

i added the driver part

and edited KConfig...Makefile and device tree file