From: Coiby Xu <coiby.xu@gmail.com>
To: Linus Walleij <linus.walleij@linaro.org>
Cc: Hans de Goede <hdegoede@redhat.com>,
"open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
wang jun <availa@outlook.com>,
Nehal Shah <Nehal-bakulchandra.Shah@amd.com>,
Shyam Sundar S K <Shyam-sundar.S-k@amd.com>,
linux-kernel-mentees@lists.linuxfoundation.org
Subject: Re: Any other ways to debug GPIO interrupt controller (pinctrl-amd) for broken touchpads of a new laptop model?
Date: Fri, 9 Oct 2020 00:40:41 +0800 [thread overview]
Message-ID: <20201008164041.7nidwia2jzfgrcon@Rk> (raw)
In-Reply-To: <CACRpkdaK-WpQdKu-tBOyvB1HLZ10ivjEPrVFqGjPSvLJuPXG8Q@mail.gmail.com>
On Tue, Oct 06, 2020 at 11:16:50AM +0200, Linus Walleij wrote:
>On Tue, Oct 6, 2020 at 10:32 AM Coiby Xu <coiby.xu@gmail.com> wrote:
>
>> Disabling the glitch filter works like a charm! Other enthusiastic
>> Linux users who have been troubled by this issue for months would
>> also feel great to know this small tweaking could bring their
>> touchpad back to life:) Thank you!
>
>Oh you found the bug :D
>
The credit should goes to Hans. Thanks to his expertise, only
one shot (disabling glitch filter) is needed. Thank you for
introducing him to me:)
>> $ git diff
>> diff --git a/drivers/pinctrl/pinctrl-amd.c b/drivers/pinctrl/pinctrl-amd.c
>> index 9a760f5cd7ed..e786d779d6c8 100644
>> --- a/drivers/pinctrl/pinctrl-amd.c
>> +++ b/drivers/pinctrl/pinctrl-amd.c
>> @@ -463,7 +463,7 @@ static int amd_gpio_irq_set_type(struct irq_data *d, unsigned int type)
>> pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
>> pin_reg |= ACTIVE_LOW << ACTIVE_LEVEL_OFF;
>> pin_reg &= ~(DB_CNTRl_MASK << DB_CNTRL_OFF);
>> - pin_reg |= DB_TYPE_PRESERVE_HIGH_GLITCH << DB_CNTRL_OFF;
>> + /** pin_reg |= DB_TYPE_PRESERVE_HIGH_GLITCH << DB_CNTRL_OFF; */
>> irq_set_handler_locked(d, handle_level_irq);
>> break;
>>
>> I will learn more about the glitch filter and the implementation of
>> pinctrl and see if I can disable glitch filter only for this touchpad.
>
>Yes we certainly need a quirk for this of some kind, examine the ACPI
>quirk infrastructure in drivers/gpio/gpiolib-acpi.c to see if you can use
>that to handle this.
>
Thank you for pointing out where I should look at! A quirk is the only
foolproof way before we confirm the other two suggestions given by Hans.
>Yours,
>Linus Walleij
--
Best regards,
Coiby
next prev parent reply other threads:[~2020-10-08 16:40 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-01 13:22 Any other ways to debug GPIO interrupt controller (pinctrl-amd) for broken touchpads of a new laptop model? Coiby Xu
2020-10-01 20:57 ` Linus Walleij
2020-10-02 9:40 ` Hans de Goede
2020-10-02 12:42 ` Coiby Xu
2020-10-02 13:36 ` Hans de Goede
2020-10-02 14:51 ` Coiby Xu
2020-10-02 19:44 ` Hans de Goede
2020-10-02 22:45 ` Coiby Xu
2020-10-03 13:22 ` Hans de Goede
2020-10-03 23:03 ` Coiby Xu
2020-10-04 5:16 ` Coiby Xu
2020-10-06 4:49 ` Coiby Xu
2020-10-06 6:28 ` Hans de Goede
2020-10-06 8:31 ` Coiby Xu
2020-10-06 8:55 ` Hans de Goede
2020-10-06 9:28 ` Hans de Goede
2020-10-06 9:29 ` Hans de Goede
2020-10-08 16:32 ` Coiby Xu
2020-10-14 4:24 ` Coiby Xu
2020-10-14 11:34 ` Coiby Xu
2020-10-14 11:46 ` Hans de Goede
2020-10-15 3:27 ` Coiby Xu
2020-10-15 4:06 ` Coiby Xu
2020-10-26 22:54 ` Coiby Xu
2020-10-27 9:52 ` Andy Shevchenko
2020-10-30 4:58 ` Coiby Xu
2020-10-27 10:09 ` Hans de Goede
2020-10-27 15:13 ` Andy Shevchenko
2020-10-27 16:00 ` Hans de Goede
2020-10-27 16:09 ` Andy Shevchenko
2020-10-29 8:04 ` Mika Westerberg
2020-10-30 4:54 ` Coiby Xu
2020-11-02 19:06 ` Andy Shevchenko
2020-11-02 22:56 ` Coiby Xu
2020-11-03 0:05 ` Coiby Xu
2020-11-03 10:12 ` Hans de Goede
2020-11-03 10:49 ` Andy Shevchenko
2020-11-03 11:00 ` Hans de Goede
2020-10-08 16:26 ` Coiby Xu
2020-10-06 9:16 ` Linus Walleij
2020-10-08 16:40 ` Coiby Xu [this message]
2020-10-02 10:59 ` Coiby Xu
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