linux-kernel - Re: [PATCH v2 05/11] mfd: pm8xxx: disassociate old virq if hwirq mapping already exists

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Date:   Tue, 12 Feb 2019 08:39:16 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Brian Masney <masneyb@...tation.org>
Cc:     linus.walleij@...aro.org, sboyd@...nel.org,
        bjorn.andersson@...aro.org, andy.gross@...aro.org,
        marc.zyngier@....com, tglx@...utronix.de, shawnguo@...nel.org,
        dianders@...omium.org, linux-gpio@...r.kernel.org,
        nicolas.dechesne@...aro.org, niklas.cassel@...aro.org,
        david.brown@...aro.org, robh+dt@...nel.org, mark.rutland@....com,
        thierry.reding@...il.com, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 05/11] mfd: pm8xxx: disassociate old virq if hwirq
 mapping already exists

On Thu, 07 Feb 2019, Brian Masney wrote:

> Check to see if the hwirq is already associated with another virq on
> this IRQ domain. If so, then disassociate it before associating the
> hwirq with the new virq.
> 
> This is a temporary hack that is needed in order to not break git
> bisect for existing boards. The next patch in this series converts
> ssbi-gpio to be a hierarchical IRQ chip, then there are several patches
> to update all of the device tree files, and finally this patch will be
> reverted within the same patch series.
> 
> IRQs for ssbi-gpio are all initially setup without an IRQ hierarchy
> this driver is probed due to the interrupts property in device tree.
> Once ssbi-gpio is converted to be a hierarchical IRQ chip in the next
> patch, existing users of gpio[d]_to_irq() will call pmic_gpio_to_irq(),
> and that will use the new IRQ chip code in ssbi-gpio that sets up the
> IRQ in an IRQ hierarchy. The hwirq is now associated with two Linux
> virqs and interrupts will not work as expected. This patch corrects
> that issue.
> 
> This change was tested on an APQ8060 DragonBoard.
> 
> Signed-off-by: Brian Masney <masneyb@...tation.org>
> Tested-by: Linus Walleij <linus.walleij@...aro.org>
> ---
> Changes since v1:
> - None
> 
>  drivers/mfd/qcom-pm8xxx.c | 6 ++++++
>  1 file changed, 6 insertions(+)

For Linus:
  
  Acked-by: Lee Jones <lee.jones@...aro.org>

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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