linux-kernel - Re: [PATCH v6 3/4] PCI: qcom: Add equalization settings for 16.0 GT/s

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Message-ID: <20240910170052.qorc7hedfy4oqzgt@thinkpad>
Date: Tue, 10 Sep 2024 22:30:52 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Johan Hovold <johan@...nel.org>
Cc: Richard Zhu <hongxing.zhu@....com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	Jingoo Han <jingoohan1@...il.com>,
	Chuanhua Lei <lchuanhua@...linear.com>,
	Marek Vasut <marek.vasut+renesas@...il.com>,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
	linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	imx@...ts.linux.dev, linux-kernel@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	abel.vesa@...aro.org, johan+linaro@...nel.org,
	Shashank Babu Chinta Venkata <quic_schintav@...cinc.com>
Subject: Re: [PATCH v6 3/4] PCI: qcom: Add equalization settings for 16.0 GT/s

On Fri, Sep 06, 2024 at 08:49:03AM +0200, Johan Hovold wrote:
> On Thu, Sep 05, 2024 at 11:04:37PM +0530, Manivannan Sadhasivam wrote:
> > On Thu, Sep 05, 2024 at 06:27:36PM +0200, Johan Hovold wrote:
> > > On Thu, Sep 05, 2024 at 08:57:42PM +0530, Manivannan Sadhasivam wrote:
>  
> > > > Perhaps we can just get rid of the Kconfig entry and build it by default for
> > > > both RC and EP drivers? I don't see a value in building it as a separate module.
> > > > And we may also move more common code in the future.
> > > 
> > > It is already built by default for both drivers. I'm not sure what
> > > you're suggesting here.
> > 
> > Right now it is selected by both drivers using a Kconfig symbol. But I'm
> > thinking of building it by default as below:
> > 
> > -obj-$(CONFIG_PCIE_QCOM) += pcie-qcom.o
> > -obj-$(CONFIG_PCIE_QCOM_EP) += pcie-qcom-ep.o
> > +obj-$(CONFIG_PCIE_QCOM) += pcie-qcom.o pcie-qcom-common.o
> > +obj-$(CONFIG_PCIE_QCOM_EP) += pcie-qcom-ep.o pcie-qcom-common.o
> > 
> > A separate Kconfig symbol is not really needed here as this file contains common
> > code required by both the drivers.
> 
> But the separate Kconfig symbol will only be enabled via either PCI
> driver's option (e.g. can't be enabled on its own).
> 

True. But since the common file is required by both drivers, I thought of just
building it by default. But looking at your below reply, it won't be possible.

> I'm also not sure if the above works if you build one driver as a module
> and the other into the kernel (yes, I still intend to resubmit my patch
> for making the rc driver modular).
> 

Hmm, I thought you dropped that patch ;) Anyway, if that happens, it will be a
problem. I'll keep it as it is.

- Mani

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