linux-kernel - Re: [PATCH v2 04/17] PCI: dwc: Detect iATU settings after getting "addr

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Message-ID: <20220516202122.GA3209795-robh@kernel.org>
Date:   Mon, 16 May 2022 15:21:22 -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>,
        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 v2 04/17] PCI: dwc: Detect iATU settings after getting
 "addr_space" resource

On Wed, May 04, 2022 at 12:46:25AM +0300, Serge Semin wrote:
> The iATU detection procedure was introduced in the commit 281f1f99cf3a
> ("PCI: dwc: Detect number of iATU windows"). A bit later the procedure
> execution was moved to Host/EP-specific methods in the framework of commit
> 8bcca2658558 ("PCI: dwc: Move iATU detection earlier"). The later
> modification wasn't done in the most optimal way since the "addr_space"
> CSR region resource doesn't depend on anything detected in the
> dw_pcie_iatu_detect() method. Thus the detection can be postponed to be
> executed after the resource request which can fail and make the detection
> pointless. It will be also helpful for the dw_pcie_ep_init() method
> readability since we are about to add the IP-core version and eDMA module
> (a bit later) detection procedures.
> 
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> 
> ---
> 
> Changelog v2:
> - This is a new patch added on v2 iteration of the series.
> ---
>  drivers/pci/controller/dwc/pcie-designware-ep.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

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