From: Marc Zyngier <maz@kernel.org>
To: Jianjun Wang <jianjun.wang@mediatek.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
Rob Herring <robh+dt@kernel.org>,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Ryder Lee <ryder.lee@mediatek.com>,
Philipp Zabel <p.zabel@pengutronix.de>,
"Matthias\ Brugger" <matthias.bgg@gmail.com>,
<linux-pci@vger.kernel.org>, <linux-mediatek@lists.infradead.org>,
<devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
"Sj\ Huang" <sj.huang@mediatek.com>, <youlin.pei@mediatek.com>,
<chuanjia.liu@mediatek.com>, <qizhong.cheng@mediatek.com>,
<sin_jieyang@mediatek.com>, <drinkcat@chromium.org>,
<Rex-BC.Chen@mediatek.com>, <anson.chuang@mediatek.com>
Subject: Re: [v8,4/7] PCI: mediatek-gen3: Add INTx support
Date: Wed, 10 Mar 2021 09:29:04 +0000 [thread overview]
Message-ID: <87czw7xspr.wl-maz@kernel.org> (raw)
In-Reply-To: <1615345515.25662.12.camel@mhfsdcap03>
On Wed, 10 Mar 2021 03:05:15 +0000,
Jianjun Wang <jianjun.wang@mediatek.com> wrote:
>
> On Tue, 2021-03-09 at 11:10 +0000, Marc Zyngier wrote:
> > On Wed, 24 Feb 2021 06:11:29 +0000,
> > Jianjun Wang <jianjun.wang@mediatek.com> wrote:
> > >
> > > +static struct irq_chip mtk_intx_irq_chip = {
> > > + .irq_enable = mtk_intx_unmask,
> > > + .irq_disable = mtk_intx_mask,
> >
> > Please get rid of enable/disable. Given that you already have
> > mask/unmask with the *same* implementation, this offers zero benefit.
>
> Hi Marc,
>
> Thanks for your review.
>
> We need to support suspend/resume feature, the HW will be powered off
> when the system is suspended, and its register value will be cleared. If
> the enable/disable callback is not implemented, the unmask function will
> not be called when the system resume, so INTx will remain disabled.
>
> Can I keep the enable/disable callback? Or do we have any solutions to
> restore the register value when the system resume?
Isn't that the job of the suspend/resume support to save and restore
the full state of the device? You shouldn't rely on the implicit
behaviours of the irq subsystem across suspend/resume.
Thanks,
M.
--
Without deviation from the norm, progress is not possible.
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next prev parent reply other threads:[~2021-03-10 9:30 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-24 6:11 [v8,0/7] PCI: mediatek: Add new generation controller support Jianjun Wang
2021-02-24 6:11 ` [v8,1/7] dt-bindings: PCI: mediatek-gen3: Add YAML schema Jianjun Wang
2021-03-06 20:09 ` Rob Herring
2021-02-24 6:11 ` [v8,2/7] PCI: Export pci_pio_to_address() for module use Jianjun Wang
2021-02-24 6:11 ` [v8,3/7] PCI: mediatek-gen3: Add MediaTek Gen3 driver for MT8192 Jianjun Wang
2021-02-24 13:36 ` Krzysztof Wilczyński
2021-02-25 3:07 ` Jianjun Wang
2021-03-11 12:38 ` Pali Rohár
2021-03-13 7:43 ` Jianjun Wang
2021-03-18 0:02 ` Pali Rohár
2021-03-18 5:48 ` Jianjun Wang
2021-03-19 18:53 ` Pali Rohár
2021-03-23 1:31 ` Jianjun Wang
2021-03-23 14:51 ` Pali Rohár
2021-03-29 22:58 ` Pali Rohár
2021-02-24 6:11 ` [v8,4/7] PCI: mediatek-gen3: Add INTx support Jianjun Wang
2021-02-24 14:24 ` Krzysztof Wilczyński
2021-02-25 3:10 ` Jianjun Wang
2021-03-09 11:10 ` Marc Zyngier
2021-03-10 3:05 ` Jianjun Wang
2021-03-10 9:29 ` Marc Zyngier [this message]
2021-02-24 6:11 ` [v8,5/7] PCI: mediatek-gen3: Add MSI support Jianjun Wang
2021-02-24 14:31 ` Krzysztof Wilczyński
2021-02-25 3:09 ` Jianjun Wang
2021-03-09 11:23 ` Marc Zyngier
2021-03-10 6:48 ` Jianjun Wang
2021-03-10 9:41 ` Marc Zyngier
2021-03-11 9:47 ` Jianjun Wang
2021-03-12 9:14 ` Marc Zyngier
2021-03-11 0:05 ` Pali Rohár
2021-03-11 8:19 ` Marc Zyngier
2021-03-11 9:50 ` Jianjun Wang
2021-02-24 6:11 ` [v8,6/7] PCI: mediatek-gen3: Add system PM support Jianjun Wang
2021-02-24 14:10 ` Krzysztof Wilczyński
2021-02-25 3:34 ` Jianjun Wang
2021-02-25 22:00 ` Krzysztof Wilczyński
2021-02-26 10:06 ` Jianjun Wang
2021-02-24 6:11 ` [v8,7/7] MAINTAINERS: Add Jianjun Wang as MediaTek PCI co-maintainer Jianjun Wang
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