linux-kernel - Re: [PATCH 10/16] PCI: dwc: Drop iATU regions enumeration

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Date:   Tue, 29 Mar 2022 10:31:18 -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>,
        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
Subject: Re: [PATCH 10/16] PCI: dwc: Drop iATU regions enumeration -
 dw_pcie_region_type

On Thu, Mar 24, 2022 at 04:37:28AM +0300, Serge Semin wrote:
> There is no point in having the dw_pcie_region_type enumeration for almost
> the same reasons as it was stated for dw_pcie_as_type. First of all it's
> redundant since the driver already has a set of macro declared which
> describe the possible inbound and outbound iATU regions. Having an
> addition abstraction just needlessly complicates the code. Secondly
> checking the region index passed to the dw_pcie_disable_atu() method for
> validity is pointless since the erroneous situation will be just
> ignored in the current code implementation. So to speak let's drop the
> redundant dw_pcie_region_type enumeration replacing it with the direct
> iATU direction macro usage.
> 
> While at it we suggest to convert the dw_pcie_disable_atu() method to
> being more consistent with the dw_pcie_readl_atu{_ib}() and
> dw_pcie_readl_atu{_ob}() functions by having the direction parameter
> specified ahead of the region index. Thus the code will be a little bit
> more pleasant to read.
> 
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> ---
>  drivers/pci/controller/dwc/pcie-designware-ep.c  |  4 ++--
>  .../pci/controller/dwc/pcie-designware-host.c    |  2 +-
>  drivers/pci/controller/dwc/pcie-designware.c     | 16 +---------------
>  drivers/pci/controller/dwc/pcie-designware.h     |  9 +--------
>  4 files changed, 5 insertions(+), 26 deletions(-)

This answers my question. I would have expected this to come before the 
previous patch, but if it's easier to do it this way it's fine.

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