linux-kernel - Re: [PATCH v2 05/17] PCI: dwc: Convert to using native IP-core versions representation

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Message-ID: <20220516203122.GC3209795-robh@kernel.org>
Date:   Mon, 16 May 2022 15:31:22 -0500
From:   Rob Herring <robh@...nel.org>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     Jingoo Han <jingoohan1@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rahul Tanwar <rtanwar@...linear.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Frank Li <Frank.Li@....com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org
Subject: Re: [PATCH v2 05/17] PCI: dwc: Convert to using native IP-core
 versions representation

On Wed, May 04, 2022 at 12:46:26AM +0300, Serge Semin wrote:
> Since DWC PCIe v4.70a the controller version can be read from the
> PORT_LOGIC.PCIE_VERSION_OFF register. Version is represented in the FourCC
> format [1]. It's standard versioning approach for the Synopsys DWC
> IP-cores. Moreover some of the DWC kernel drivers already make use of it
> to fixup version-dependent functionality (See DWC USB3, Stmicro STMMAC or
> recent DW SPI driver). In order to preserve the standard version
> representation and prevent the data conversion back and forth, we suggest
> to preserve the native version representation in the DWC PCIe driver too
> in the same way as it has already been done in the rest of the DWC
> drivers. IP-core version reading from the CSR will be introduced in the
> next commit together with a simple macro-based API to use it.
> 
> [1] https://en.wikipedia.org/wiki/FourCC
> 
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> ---
>  drivers/pci/controller/dwc/pci-keystone.c    | 12 ++++++------
>  drivers/pci/controller/dwc/pcie-designware.c |  8 ++++----
>  drivers/pci/controller/dwc/pcie-designware.h | 10 +++++++++-
>  drivers/pci/controller/dwc/pcie-intel-gw.c   |  4 ++--
>  drivers/pci/controller/dwc/pcie-tegra194.c   |  2 +-
>  5 files changed, 22 insertions(+), 14 deletions(-)

Reviewed-by: Rob Herring <robh@...nel.org>