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From: Linus Walleij <linus.walleij@linaro.org>
To: Hans Verkuil <hverkuil@xs4all.nl>, Russell King <linux@armlinux.org.uk>
Cc: Maulik Shah <mkshah@codeaurora.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Marc Zyngier <maz@kernel.org>, Stephen Boyd <swboyd@chromium.org>,
	Evan Green <evgreen@chromium.org>,
	Matthias Kaehlcke <mka@chromium.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	MSM <linux-arm-msm@vger.kernel.org>,
	"open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
	Andy Gross <agross@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Jason Cooper <jason@lakedaemon.net>,
	Doug Anderson <dianders@chromium.org>,
	Rajendra Nayak <rnayak@codeaurora.org>,
	Lina Iyer <ilina@codeaurora.org>,
	lsrao@codeaurora.org
Subject: Re: [PATCH v2 1/4] gpio: gpiolib: Allow GPIO IRQs to lazy disable
Date: Wed, 27 May 2020 15:56:16 +0200	[thread overview]
Message-ID: <CACRpkdY3pJVvAi_a=pVVQQbQyA3_b=o2pJqb5W8Wivp-SSy+tA@mail.gmail.com> (raw)
In-Reply-To: <3efa1f69-1e1d-f919-d47e-b4c5c73532b7@xs4all.nl>

On Wed, May 27, 2020 at 12:38 PM Hans Verkuil <hverkuil@xs4all.nl> wrote:

> However, I discovered that patch 256efaea1fdc ("gpiolib: fix up emulated
> open drain outputs") broke the cec-gpio driver on the Raspberry Pi starting
> with kernel v5.5.
>
> The CEC pin is an open drain pin that is used in both input and output
> directions and has an interrupt (which is of course disabled while in
> output mode).
>
> With this patch the interrupt can no longer be requested:
>
> [    4.157806] gpio gpiochip0: (pinctrl-bcm2835): gpiochip_lock_as_irq: tried to flag a GPIO set as output for IRQ
>
> [    4.168086] gpio gpiochip0: (pinctrl-bcm2835): unable to lock HW IRQ 7 for IRQ
> [    4.175425] genirq: Failed to request resources for cec-gpio@7 (irq 79) on irqchip pinctrl-bcm2835
> [    4.184597] cec-gpio: probe of cec-gpio@7 failed with error -5

There is nothing conceptually wrong with that patch so I think we
need to have the irqchip code check if it is input *OR* open drain.

I'll send a separate patch for this, it should be an easy fix.

Yours,
Linus Walleij

  reply	other threads:[~2020-05-27 13:56 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-23 17:11 [PATCH v2 0/4] irqchip: qcom: pdc: Introduce irq_set_wake call Maulik Shah
2020-05-23 17:11 ` [PATCH v2 1/4] gpio: gpiolib: Allow GPIO IRQs to lazy disable Maulik Shah
2020-05-25 11:55   ` Linus Walleij
2020-05-25 12:22     ` Hans Verkuil
2020-05-26  4:45       ` Maulik Shah
2020-05-27 10:38     ` Hans Verkuil
2020-05-27 13:56       ` Linus Walleij [this message]
2020-05-27 14:15         ` Russell King - ARM Linux admin
2020-05-27  9:44   ` Stephen Boyd
2020-05-27 11:26     ` Maulik Shah
2020-05-28  1:08       ` Stephen Boyd
2020-05-28 13:11         ` Maulik Shah
2020-05-28 22:22           ` Stephen Boyd
2020-05-29  9:57             ` Maulik Shah
2020-05-28 21:33   ` Linus Walleij
     [not found]     ` <159070486671.69627.662167272601689396@swboyd.mtv.corp.google.com>
2020-06-03 12:28       ` Linus Walleij
2020-05-23 17:11 ` [PATCH v2 2/4] pinctrl: qcom: Remove irq_disable callback from msmgpio irqchip Maulik Shah
2020-05-23 17:11 ` [PATCH v2 3/4] pinctrl: qcom: Add msmgpio irqchip flags Maulik Shah
2020-05-27  9:47   ` Stephen Boyd
2020-05-27 12:30     ` Maulik Shah
2020-05-23 17:11 ` [PATCH v2 4/4] irqchip: qcom-pdc: Introduce irq_set_wake call Maulik Shah
2020-05-27 10:15   ` Stephen Boyd
2020-05-29  9:20     ` Maulik Shah
2020-05-30 19:26       ` Stephen Boyd
2020-06-01 11:38         ` Maulik Shah
2020-06-16 11:57           ` Stephen Boyd
2020-06-18 10:03             ` Maulik Shah
2020-06-19  9:26               ` Stephen Boyd
2020-06-22  9:19                 ` Maulik Shah

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