linux-kernel - RE: [PATCH V1] PCI: tegra194: Add support for PCIe RC & EP in Tegra234 Platforms

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Message-ID:
 <BN9PR12MB53239715E7131254B07CCAE9B8F22@BN9PR12MB5323.namprd12.prod.outlook.com>
Date: Mon, 10 Feb 2025 17:56:35 +0000
From: Vidya Sagar <vidyas@...dia.com>
To: "manivannan.sadhasivam@...aro.org" <manivannan.sadhasivam@...aro.org>
CC: Niklas Cassel <cassel@...nel.org>, "lpieralisi@...nel.org"
	<lpieralisi@...nel.org>, "kw@...ux.com" <kw@...ux.com>, "robh@...nel.org"
	<robh@...nel.org>, "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
	"quic_schintav@...cinc.com" <quic_schintav@...cinc.com>,
	"johan+linaro@...nel.org" <johan+linaro@...nel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Thierry Reding
	<treding@...dia.com>, Jon Hunter <jonathanh@...dia.com>, Krishna Thota
	<kthota@...dia.com>, Manikanta Maddireddy <mmaddireddy@...dia.com>,
	"sagar.tv@...il.com" <sagar.tv@...il.com>
Subject: RE: [PATCH V1] PCI: tegra194: Add support for PCIe RC & EP in
 Tegra234 Platforms



> -----Original Message-----
> From: manivannan.sadhasivam@...aro.org <manivannan.sadhasivam@...aro.org>
> Sent: 10 February 2025 23:21
> To: Vidya Sagar <vidyas@...dia.com>
> Cc: Niklas Cassel <cassel@...nel.org>; lpieralisi@...nel.org; kw@...ux.com;
> robh@...nel.org; bhelgaas@...gle.com; quic_schintav@...cinc.com;
> johan+linaro@...nel.org; linux-pci@...r.kernel.org; linux-kernel@...r.kernel.org;
> Thierry Reding <treding@...dia.com>; Jon Hunter <jonathanh@...dia.com>; Krishna
> Thota <kthota@...dia.com>; Manikanta Maddireddy <mmaddireddy@...dia.com>;
> sagar.tv@...il.com
> Subject: Re: [PATCH V1] PCI: tegra194: Add support for PCIe RC & EP in Tegra234
> Platforms
> 
> External email: Use caution opening links or attachments
> 
> 
> On Mon, Feb 10, 2025 at 02:25:43PM +0000, Vidya Sagar wrote:
> > Thanks Niklas for the review.
> > I'll rewrite the commit message add the following line
> > Fixes: a54e19073718 ("PCI: tegra194: Add Tegra234 PCIe support")
> >
> 
> No, please. Try to use the generic ARCH symbol dependency as suggested.
We wanted to have more granularity in terms of enabling the driver
for only those SoCs where the respective hardware is available.
But, if the community has strong preference towards enabling
the drivers at a higher level, I'll modify and send next version
of the patch accordingly.

- Vidya Sagar

> 
> - Mani
> 
> > Thanks
> > Vidya Sagar
> >
> > ________________________________
> > From: Niklas Cassel <cassel@...nel.org>
> > Sent: Tuesday, January 28, 2025 17:34
> > To: Vidya Sagar <vidyas@...dia.com>
> > Cc: lpieralisi@...nel.org <lpieralisi@...nel.org>; kw@...ux.com
> > <kw@...ux.com>; manivannan.sadhasivam@...aro.org
> > <manivannan.sadhasivam@...aro.org>; robh@...nel.org <robh@...nel.org>;
> > bhelgaas@...gle.com <bhelgaas@...gle.com>; quic_schintav@...cinc.com
> > <quic_schintav@...cinc.com>; johan+linaro@...nel.org
> > <johan+linaro@...nel.org>; linux-pci@...r.kernel.org
> > <linux-pci@...r.kernel.org>; linux-kernel@...r.kernel.org
> > <linux-kernel@...r.kernel.org>; Thierry Reding <treding@...dia.com>;
> > Jon Hunter <jonathanh@...dia.com>; Krishna Thota <kthota@...dia.com>;
> > Manikanta Maddireddy <mmaddireddy@...dia.com>; sagar.tv@...il.com
> > <sagar.tv@...il.com>
> > Subject: Re: [PATCH V1] PCI: tegra194: Add support for PCIe RC & EP in
> > Tegra234 Platforms
> >
> > External email: Use caution opening links or attachments
> >
> >
> > Hello Vidya,
> >
> > On Tue, Jan 28, 2025 at 10:12:44AM +0530, Vidya Sagar wrote:
> > > Add PCIe RC & EP support for Tegra234 Platforms.
> >
> > The commit log does leave quite a few questions unanswered.
> >
> > Since you are just updating the Kconfig and nothing else:
> > Does the DT binding already have support for the Tegra234 SoC?
> > Does the driver already have support for the Tegra234 SoC?
> >
> > Looking at the DT binding and driver, the answer to both questions is
> > yes. (This should have been in the commit message IMO.)
> >
> >
> > But that leads me to the question, since there is support for Tegra234
> > SoC in the driver, does this means that this fixes a regression, e.g.
> > the Kconfig ARCH_TEGRA_234_SOC was added after the driver support in
> > this driver was added. In this case, you should have a Fixes: tag that
> > points to the commit that added ARCH_TEGRA_234_SOC.
> >
> > Or has the the driver support for Tegra234 been "dead-code" since it
> > was originally added? (Because without this patch, no one can have
> > tested it, at least not without COMPILE_TEST.) In this case, you
> > should add:
> > Fixes: a54e19073718 ("PCI: tegra194: Add Tegra234 PCIe support")
> >
> >
> > Kind regards,
> > Niklas
> 
> --
> மணிவண்ணன் சதாசிவம்