linux-kernel - Re: [PATCH v13 09/10] PCI: kirin: fix poweroff sequence

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Message-ID: <20211018153716.0370a66c@sal.lan>
Date:   Mon, 18 Oct 2021 15:37:16 +0100
From:   Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc:     linuxarm@...wei.com, mauro.chehab@...wei.com,
        Krzysztof Wilczyński 
        <kw@...ux.com>, Songxiaowei <songxiaowei@...ilicon.com>,
        Binghui Wang <wangbinghui@...ilicon.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh@...nel.org>, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org
Subject: Re: [PATCH v13 09/10] PCI: kirin: fix poweroff sequence

Em Mon, 18 Oct 2021 11:21:27 +0100
Lorenzo Pieralisi <lorenzo.pieralisi@....com> escreveu:

> On Mon, Oct 18, 2021 at 08:07:34AM +0100, Mauro Carvalho Chehab wrote:
> > This driver currently doesn't call dw_pcie_host_deinit()
> > at the .remove() callback. This can cause an OOPS if the driver
> > is unbound.  
> 
> This looks like a fix, it has to be marked as such.

Well, without patch 10/10, the .remove() ops won't be called,
so, it is not really a fix, but I can surely add a c/c
stable@...r.kernel.org and add a Fixes: tag here.

> 
> > While here, add a poweroff function, in order to abstract
> > between the internal and external PHY logic.
> > 
> > Acked-by: Xiaowei Song <songxiaowei@...ilicon.com>
> > Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
> > ---
> > 
> > See [PATCH v13 00/10] at: https://lore.kernel.org/all/cover.1634539769.git.mchehab+huawei@kernel.org/
> > 
> >  drivers/pci/controller/dwc/pcie-kirin.c | 30 ++++++++++++++++---------
> >  1 file changed, 20 insertions(+), 10 deletions(-)
> > 
> > diff --git a/drivers/pci/controller/dwc/pcie-kirin.c b/drivers/pci/controller/dwc/pcie-kirin.c
> > index b17a194cf78d..ffc63d12f8ed 100644
> > --- a/drivers/pci/controller/dwc/pcie-kirin.c
> > +++ b/drivers/pci/controller/dwc/pcie-kirin.c
> > @@ -680,6 +680,23 @@ static const struct dw_pcie_host_ops kirin_pcie_host_ops = {
> >  	.host_init = kirin_pcie_host_init,
> >  };
> >  
> > +static int kirin_pcie_power_off(struct kirin_pcie *kirin_pcie)
> > +{
> > +	int i;
> > +
> > +	if (kirin_pcie->type == PCIE_KIRIN_INTERNAL_PHY)
> > +		return hi3660_pcie_phy_power_off(kirin_pcie);
> > +
> > +	for (i = 0; i < kirin_pcie->n_gpio_clkreq; i++) {
> > +		gpio_direction_output(kirin_pcie->gpio_id_clkreq[i], 1);
> > +	}  
> 
> It looks like you are adding functionality here (ie gpio), not
> just wrapping common code in a function.

It is just reverting the power on logic there.

> 
> Also, remove the braces, they aren't needed.

Yeah, I forgot to drop it, when I dropped a tem code that had some
dev_dbg() on it.

I'll drop on v14.

Regards,
Mauro