topic tsc2007 working strangely in i.MX Processors

tsc2007 working strangely

dluberger — Fri, 21 Sep 2018 14:39:26 GMT

I'm using a tsc2007 touchscreen controller, and if i set status="disabled" in my device tree, i can see it with i2cdetect (shows up as address 49), however, if i enable the driver to load during boot, the kernel first hangs until i tap the touchscreen, then the OS loads, but during that time i get lots of errors that show "tsc2007 1-0049: i2c io error: -11" over and over. eventually the OS comes up but the touchscreen doesn't respond to my touches. I was able to get it to work on the imx6ull eval board (though it was really jumpy and sensitive). I found other posts on this site and a recommendation I saw was to copy an existing device tree. Here's the relevant info from my device tree:

&i2c2 {
clock_frequency = <100000>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_i2c2>;
status = "okay";

touchscreen: tsc2007@49 {
compatible = "ti,tsc2007";
reg = <0x49>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_tsc2007>;
  interrupt-parent = <&gpio1>;
  interrupts = <0x0 0x8>;
  gpios = <&gpio1 1 GPIO_ACTIVE_LOW>;
  ti,x-plate-ohms = <660>;
  linux,wakeup;
  };
};
&iomuxc {
  pinctrl-names = "default";
  pinctrl-0 = <&pinctrl_hog_1>;
  pinctrl_hog_1: hoggrp-1 {
    fsl,pins = <
          MX6UL_PAD_SNVS_TAMPER0__GPIO5_IO00 0x17059
    >;
  };
  pinctrl_i2c1: i2c1grp {
    fsl,pins = <
      MX6UL_PAD_UART4_TX_DATA__I2C1_SCL 0x4001b8b0
      MX6UL_PAD_UART4_RX_DATA__I2C1_SDA 0x4001b8b0
    >;
  };
  pinctrl_tsc2007: tsc2007grp {
    fsl,pins = <
      MX6UL_PAD_GPIO1_IO01__GPIO1_IO01 0x1b0b0
    >;
  };
};

Re: tsc2007 working strangely

igorpadykov — Fri, 21 Sep 2018 23:41:20 GMT

Hi David

one can try to rebuild image anew, also if this a copy from other processor recheck

if used pins are not used for other modules. One can try to find place where processor hangs

using AN4553 Using Open Source Debugging Tools for Linux on i.MX Processors
https://www.nxp.com/docs/en/application-note/AN4553.pdf

Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

Re: tsc2007 working strangely

dluberger — Tue, 25 Sep 2018 17:01:15 GMT

Which image do you mean to rebuild? The zImage file for the kernel? Shouldn't modifying and rebuilding the device tree always be sufficient? Is there nothing in the device tree settings for this device that would cause the kernel to wait for a touch input? It's interrupt-driven, so it would seem to me that there's simply something about the interrupt setup that would make it high priority enough that the kernel waits for the interrupt.

Re: tsc2007 working strangely

igorpadykov — Wed, 26 Sep 2018 01:43:45 GMT

one can try general touchscreen suggestions on

Why doesn't the tsc2007 touchscreen device appear? iMX6 Sabre Solox Eval Board

Best regards
igor

Re: tsc2007 working strangely

trevor_gta — Thu, 29 Jun 2023 19:33:50 GMT

Did you managed to solve this problem?
I have the same strange random "i2c io error: -11" error with TSC2007.