linux-kernel - Re: [PATCH v9 06/10] PCI: dwc: ep: Call dw_pcie_ep_init_registers() API directly from all glue drivers

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Message-ID: <20240308053624.GB3789@thinkpad>
Date: Fri, 8 Mar 2024 11:06:24 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Niklas Cassel <cassel@...nel.org>
Cc: Jingoo Han <jingoohan1@...il.com>,
	Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Marek Vasut <marek.vasut+renesas@...il.com>,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
	Thierry Reding <thierry.reding@...il.com>,
	Jonathan Hunter <jonathanh@...dia.com>,
	Kishon Vijay Abraham I <kishon@...com>,
	Vidya Sagar <vidyas@...dia.com>,
	Vignesh Raghavendra <vigneshr@...com>,
	Richard Zhu <hongxing.zhu@....com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	NXP Linux Team <linux-imx@....com>,
	Minghuan Lian <minghuan.Lian@....com>,
	Mingkai Hu <mingkai.hu@....com>, Roy Zang <roy.zang@....com>,
	Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Jesper Nilsson <jesper.nilsson@...s.com>,
	Srikanth Thokala <srikanth.thokala@...el.com>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-tegra@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org,
	linux-arm-kernel@...s.com
Subject: Re: [PATCH v9 06/10] PCI: dwc: ep: Call dw_pcie_ep_init_registers()
 API directly from all glue drivers

On Thu, Mar 07, 2024 at 09:36:56PM +0100, Niklas Cassel wrote:
> On Mon, Mar 04, 2024 at 02:52:18PM +0530, Manivannan Sadhasivam wrote:
> > Currently, dw_pcie_ep_init_registers() API is directly called by the glue
> > drivers requiring active refclk from host. But for the other drivers, it is
> > getting called implicitly by dw_pcie_ep_init(). This is due to the fact
> > that this API initializes DWC EP specific registers and that requires an
> > active refclk (either from host or generated locally by endpoint itsef).
> > 
> > But, this causes a discrepancy among the glue drivers. So to avoid this
> > confusion, let's call this API directly from all glue drivers irrespective
> > of refclk dependency. Only difference here is that the drivers requiring
> > refclk from host will call this API only after the refclk is received and
> > other drivers without refclk dependency will call this API right after
> > dw_pcie_ep_init().
> > 
> > With this change, the check for 'core_init_notifier' flag can now be
> > dropped from dw_pcie_ep_init() API. This will also allow us to remove the
> > 'core_init_notifier' flag completely in the later commits.
> > 
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > ---
> >  drivers/pci/controller/dwc/pci-dra7xx.c           |  7 +++++++
> >  drivers/pci/controller/dwc/pci-imx6.c             |  8 ++++++++
> >  drivers/pci/controller/dwc/pci-keystone.c         |  9 +++++++++
> >  drivers/pci/controller/dwc/pci-layerscape-ep.c    |  7 +++++++
> >  drivers/pci/controller/dwc/pcie-artpec6.c         | 13 ++++++++++++-
> >  drivers/pci/controller/dwc/pcie-designware-ep.c   | 22 ----------------------
> >  drivers/pci/controller/dwc/pcie-designware-plat.c |  9 +++++++++
> >  drivers/pci/controller/dwc/pcie-keembay.c         | 16 +++++++++++++++-
> >  drivers/pci/controller/dwc/pcie-rcar-gen4.c       | 12 +++++++++++-
> >  drivers/pci/controller/dwc/pcie-uniphier-ep.c     | 13 ++++++++++++-
> >  10 files changed, 90 insertions(+), 26 deletions(-)
> > 
> > diff --git a/drivers/pci/controller/dwc/pci-dra7xx.c b/drivers/pci/controller/dwc/pci-dra7xx.c
> > index 0e406677060d..395042b29ffc 100644
> > --- a/drivers/pci/controller/dwc/pci-dra7xx.c
> > +++ b/drivers/pci/controller/dwc/pci-dra7xx.c
> > @@ -467,6 +467,13 @@ static int dra7xx_add_pcie_ep(struct dra7xx_pcie *dra7xx,
> >  		return ret;
> >  	}
> >  
> > +	ret = dw_pcie_ep_init_registers(ep);
> > +	if (ret) {
> 
> Here you are using if (ret) to error check the return from
> dw_pcie_ep_init_registers().
> 
> 
> > index c0c62533a3f1..8392894ed286 100644
> > --- a/drivers/pci/controller/dwc/pci-keystone.c
> > +++ b/drivers/pci/controller/dwc/pci-keystone.c
> > @@ -1286,6 +1286,13 @@ static int ks_pcie_probe(struct platform_device *pdev)
> >  		ret = dw_pcie_ep_init(&pci->ep);
> >  		if (ret < 0)
> >  			goto err_get_sync;
> > +
> > +		ret = dw_pcie_ep_init_registers(&pci->ep);
> > +		if (ret < 0) {
> 
> Here you are using if (ret < 0) to error check the return from
> dw_pcie_ep_init_registers(). Please be consistent.
> 

I maintained the consistency w.r.t individual drivers. Please check them
individually.

If I maintain consistency w.r.t this patch, then the style will change within
the drivers.

- Mani

> 
> > diff --git a/drivers/pci/controller/dwc/pcie-artpec6.c b/drivers/pci/controller/dwc/pcie-artpec6.c
> > index 9ed0a9ba7619..0edd9ab3f139 100644
> > --- a/drivers/pci/controller/dwc/pcie-artpec6.c
> > +++ b/drivers/pci/controller/dwc/pcie-artpec6.c
> > @@ -441,7 +441,18 @@ static int artpec6_pcie_probe(struct platform_device *pdev)
> >  
> >  		pci->ep.ops = &pcie_ep_ops;
> >  
> > -		return dw_pcie_ep_init(&pci->ep);
> > +		ret = dw_pcie_ep_init(&pci->ep);
> > +		if (ret < 0)
> 
> Here you are using if (ret < 0) to error check the return from
> dw_pcie_ep_init().
> 
> 
> > index 778588b4be70..ca9b22e654cd 100644
> > --- a/drivers/pci/controller/dwc/pcie-designware-plat.c
> > +++ b/drivers/pci/controller/dwc/pcie-designware-plat.c
> > @@ -145,6 +145,15 @@ static int dw_plat_pcie_probe(struct platform_device *pdev)
> >  
> >  		pci->ep.ops = &pcie_ep_ops;
> >  		ret = dw_pcie_ep_init(&pci->ep);
> > +		if (ret)
> 
> Here you are using if (ret) to error check the return from
> dw_pcie_ep_init(). Please be consistent.

-- 
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