lkml.org 
[lkml]   [2023]   [May]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH v6 2/2] can: m_can: Add hrtimer to generate software interrupt
From
Hello,

On 5/22/23 1:37 PM, Marc Kleine-Budde wrote:
> On 22.05.2023 10:17:38, Judith Mendez wrote:
>>>> diff --git a/drivers/net/can/m_can/m_can_platform.c b/drivers/net/can/m_can/m_can_platform.c
>>>> index 94dc82644113..3e60cebd9d12 100644
>>>> --- a/drivers/net/can/m_can/m_can_platform.c
>>>> +++ b/drivers/net/can/m_can/m_can_platform.c
>>>> @@ -5,6 +5,7 @@
>>>> //
>>>> // Copyright (C) 2018-19 Texas Instruments Incorporated - http://www.ti.com/
>>>> +#include <linux/hrtimer.h>
>>>> #include <linux/phy/phy.h>
>>>> #include <linux/platform_device.h>
>>>> @@ -96,12 +97,40 @@ static int m_can_plat_probe(struct platform_device *pdev)
>>>> goto probe_fail;
>>>> addr = devm_platform_ioremap_resource_byname(pdev, "m_can");
>>>> - irq = platform_get_irq_byname(pdev, "int0");
>>>> - if (IS_ERR(addr) || irq < 0) {
>>>> - ret = -EINVAL;
>>>> + if (IS_ERR(addr)) {
>>>> + ret = PTR_ERR(addr);
>>>> goto probe_fail;
>>>> }
>>>
>>> As we don't use an explicit "poll-interval" anymore, this needs some
>>> cleanup. The flow should be (pseudo code, error handling omitted):
>>>
>>> if (device_property_present("interrupts") {
>>> platform_get_irq_byname();
>>> polling = false;
>>> } else {
>>> hrtimer_init();
>>> polling = true;
>>> }
>>
>> Ok.
>>
>>>
>>>> + irq = platform_get_irq_byname_optional(pdev, "int0");
>>>
>>> Remove the "_optional" and....
>>
>> On V2, you asked to add the _optional?.....
>>
>>> irq = platform_get_irq_byname(pdev, "int0");
>>
>> use platform_get_irq_byname_optional(), it doesn't print an error
>> message.
>
> ACK - I said that back in v2, when there was "poll-interval". But now we
> don't use "poll-interval" anymore, but test if interrupt properties are
> present.
>
> See again pseudo-code I posted in my last mail:
>
> | if (device_property_present("interrupts") {
> | platform_get_irq_byname();
>
> If this throws an error, it's fatal, bail out.
>
> | polling = false;
> | } else {
> | hrtimer_init();
> | polling = true;
> | }
>

Ok, will add this then..


>>
>>>
>>>> + if (irq == -EPROBE_DEFER) {
>>>> + ret = -EPROBE_DEFER;
>>>> + goto probe_fail;
>>>> + }
>>>> +
>>>> + if (device_property_present(mcan_class->dev, "interrupts") ||
>>>> + device_property_present(mcan_class->dev, "interrupt-names"))
>>>> + mcan_class->polling = false;
>>>
>>> ...move the platform_get_irq_byname() here
>>
>> ok,
>>
>>>
>>>> + else
>>>> + mcan_class->polling = true;
>>>> +
>>>> + if (!mcan_class->polling && irq < 0) {
>>>> + ret = -ENXIO;
>>>> + dev_err_probe(mcan_class->dev, ret, "IRQ int0 not found, polling not activated\n");
>>>> + goto probe_fail;
>>>> + }
>>>
>>> Remove this check.
>>
>> Should we not go to 'probe fail' if polling is not activated and irq is not
>> found?
>
> If an interrupt property is present in the DT, we use it - if request
> IRQ fails, something is broken and we've already bailed out. See above.
> If there is no interrupt property we use polling.

Got it, thanks.

>>
>>>
>>>> +
>>>> + if (mcan_class->polling) {
>>>> + if (irq > 0) {
>>>> + mcan_class->polling = false;
>>>> + dev_info(mcan_class->dev, "Polling enabled, using hardware IRQ\n");
>>>
>>> Remove this.
>>
>> Remove the dev_info?
>
> ACK, this is not possible anymore - we cannot have polling enabled and
> HW IRQs configured.

Sounds good, will submit a v7 with these cleanup changes.

regards,
Judith

\
 
 \ /
  Last update: 2023-05-22 21:02    [W:1.199 / U:0.208 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site