Re: mcp251x hangs during ifup

[Marc Kleine-Budde <mkl@pengutronix.de>]

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On 02.03.2021 22:10:49, ukrfoil.com, Cтудиопак Украина, Восточный регион wrote:
> The reason for the terminal freezing on these boards (as an example of
> Nanopi NEO) occurs in this function when trying to disable interrupts
> disable_irq(spi->irq); If you comment out this given call, the hangs
> do not occur.

Nice debugging!

Can you give us the complete device tree and the output of:

    cat /proc/interrupts

Maybe there's a shared interrupt that's vital for your system.

One note:

| can0: can@0 {
|	reg = <0>;
|	compatible = "microchip,mcp2515";
|	pinctrl-names = "default";
|	pinctrl-0 = <&can0_pin_irq>;
|	interrupt-parent = <&pio>;
|	interrupts = <6 8 IRQ_TYPE_EDGE_FALLING>;

You better use IRQ_TYPE_LEVEL_LOW instead of IRQ_TYPE_EDGE_FALLING, but
that's unrelated to this problem.

|	clocks = <&can0_osc_fixed>;
|	spi-max-frequency = <10000000>;
|	gpio-controller;
|	gpio-cells = <2>;
|	status = "okay";
| };

regards,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
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