linux-kernel - Re: [PATCH v4 02/18] PCI: dwc: Add unroll iATU space support to the regions disable method

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Message-ID: <20220613200032.GA4174748-robh@kernel.org>
Date:   Mon, 13 Jun 2022 14:00:32 -0600
From:   Rob Herring <robh@...nel.org>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Jingoo Han <jingoohan1@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Kishon Vijay Abraham I <kishon@...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, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 02/18] PCI: dwc: Add unroll iATU space support to the
 regions disable method

On Fri, Jun 10, 2022 at 11:25:18AM +0300, Serge Semin wrote:
> The dw_pcie_disable_atu() method was introduced in the commit f8aed6ec624f
> ("PCI: dwc: designware: Add EP mode support"). Since then it hasn't
> changed at all.  For all that time the method has supported the viewport
> version of the iATU CSRs only. Basically it works for the DW PCIe IP-cores
> older than v4.80a since the newer controllers are equipped with the
> unrolled iATU/eDMA space. It means the methods using it like
> pci_epc_ops.clear_bar and pci_epc_ops.unmap_addr callbacks just don't work
> correctly for the DW PCIe controllers with unrolled iATU CSRs. The same
> concerns the dw_pcie_setup_rc() method, which disables the outbound iATU
> entries before re-initializing them.
> 
> So in order to fix the problems denoted above let's convert the
> dw_pcie_disable_atu() method to disabling the iATU inbound and outbound
> regions in the unrolled iATU CSRs in case the DW PCIe controller has been
> synthesized with the ones support. The former semantics will be remained
> for the controller having iATU mapped over the viewport.
> 
> Fixes: f8aed6ec624f ("PCI: dwc: designware: Add EP mode support")
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> Tested-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> 
> ---
> 
> Changelog v3:
> - Convert region variable type to u32 in order to fix the implicit type
>   conversion peculiarity. (@kbot)
> ---
>  drivers/pci/controller/dwc/pcie-designware.c | 16 +++++++++++++---
>  1 file changed, 13 insertions(+), 3 deletions(-)

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