bb_x15 : DCAN communication problem

[ezio H]

Link on ti e2e:  https://e2e.ti.com/support/arm/sitara_arm/f/791/t/710355.

bb_x15 's DCAM1 don't work on either ubuntu-16.04.3-minimal-armhf-2017-10-10   or  TI's Arogo

On Arogo,I use:

root@am57xx-evm:~# canconfig can0 bitrate 50000 ctrlmode triple-samplin
[  757.361582] omap_hwmod: dcan1: _wait_target_disable failed
can0 bitrate: 50000, sample-point: 0.875                               
[  757.376837] omap_hwmod: dcan1: _wait_target_disable failed          
can0 ctrlmode: loopback[OFF], listen-only[OFF], tripple-sampling[ON],one-shot[OFF], berr-reporting[OFF]
root@am57xx-evm:~# ifconfig can0 up 

And everything about CAN looks good 

root@am57xx-evm:~# lsmod | grep can                                
can_raw                 6589  2                                              
can                    29904  1 can_raw                                      
c_can_platform          6638  0         
c_can                   9718  1 c_can_platform
can_dev                12397  1 c_can

root@am57xx-evm:~# cat /proc/device-tree/ocp/can\@481cc000/status      
okay

Except: omap_hwmod: dcan1: _wait_target_disable failed.
What should I do with this error messagge 

[ezio H]

arch/arm/mach-omap2/omap_hwmod.c:  line 1845

/**

 * _omap4_disable_module - enable CLKCTRL modulemode on OMAP4

 * @oh: struct omap_hwmod *

 *

 * Disable the PRCM module mode related to the hwmod @oh.

 * Return EINVAL if the modulemode is not supported and 0 in case of success.

 */

static int _omap4_disable_module(struct omap_hwmod *oh)

{

int v;

if (!oh->clkdm || !oh->prcm.omap4.modulemode)

return -EINVAL;

/*

* Since integration code might still be doing something, only

* disable if all lines are under hardreset.

*/

if (_are_any_hardreset_lines_asserted(oh))

return 0;

pr_debug("omap_hwmod: %s: %s\n", oh->name, __func__);

omap_cm_module_disable(oh->clkdm->prcm_partition, oh->clkdm->cm_inst,

       oh->prcm.omap4.clkctrl_offs);

v = _omap4_wait_target_disable(oh);

if (v)

pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",

oh->name);

return 0;

}

在 2018年8月14日星期二 UTC+8下午3:27:31，ezio H写道：

[arim...@gmail.com]

Hi,

Now can you use dcan on bb-x15?

If yes, please advise me how do open it

I see this link https://e2e.ti.com/support/processors/f/791/p/715990/2645332#pi239031349=1

but it cannot use

เมื่อ วันอังคารที่ 14 สิงหาคม ค.ศ. 2018 14 นาฬิกา 27 นาที 31 วินาที UTC+7, ezio H เขียนว่า:

[ezio H]

Hello ,Thanks for reply.

en...Good news is that DCAN can work in loopback mode !

Bad news is still that  DCAN can't use in nomal mode .I keep consulting the TI engineer.

referring to https://e2e.ti.com/support/processors/f/791/p/739907/2731843#2731843

在 2018年10月11日星期四 UTC+8下午7:53:59，arim...@gmail.com写道：

[arim...@gmail.com]

Within the past week I tried to open DCAN. Now it work.

I can send and receive package through DCAN.

1. I follow cross-compiler kernel this link

https://www.digikey.com/eewiki/display/linuxonarm/BeagleBoard-X15 

2. After step download kernel I edit file am57xx-beagle-x15-common.dtsi by reference from am57xx-idk-common.dtsi

&dra7_pmx_core {
        dcan1_pins_default: dcan1_pins_default {
                pinctrl-single,pins = <
                        DRA7XX_CORE_IOPAD(0x37d0, PIN_OUTPUT_PULLUP | MUX_MODE0)        /* dcan1_tx */
                        DRA7XX_CORE_IOPAD(0x37d4, PIN_INPUT_PULLUP | MUX_MODE0)                /* dcan1_rx */
                >;
        };

        dcan1_pins_sleep: dcan1_pins_sleep {
                pinctrl-single,pins = <
                        DRA7XX_CORE_IOPAD(0x37d0, MUX_MODE15 | PULL_UP)        /* dcan1_tx.off */
                        DRA7XX_CORE_IOPAD(0x37d4, MUX_MODE15 | PULL_UP)        /* dcan1_rx.off */
                >;
        };
};

&dcan1 {
        status = "okay";
        pinctrl-names = "default", "sleep", "active";
        pinctrl-0 = <&dcan1_pins_sleep>;
        pinctrl-1 = <&dcan1_pins_sleep>;
        pinctrl-2 = <&dcan1_pins_default>;
};

3. After login debian I open dcan with command : ip link set can0 type can; ifconfig can0 up;

you can see my forum talked with TI engineer

https://e2e.ti.com/support/processors/f/791/t/732131?tisearch=e2e-quicksearch&keymatch=beagleboard#pi320627=1

Thank

เมื่อ วันพุธที่ 24 ตุลาคม ค.ศ. 2018 16 นาฬิกา 43 นาที 09 วินาที UTC+7, ezio H เขียนว่า:

[ezio H]

Thanks for reply.

Good for you ,but I still can't make dcan1 work using am57xx-beagle-x15-revc.dtb.And what's more ,I even meet a problem that pin (dcan_tx) cannot be control by cpu,no matter in what pin mode (really really annoying ,and I try another bb_X15 board.Then it worked normally .I think that pin is broken ).

Now intead ,I am using dcan2 ,and it works perfectly ,referring to https://e2e.ti.com/support/processors/f/791/p/739907/2743480#2743480.

在 2018年10月25日星期四 UTC+8上午2:13:01，arim...@gmail.com写道：