linux-kernel - Re: [PATCH 00/15] PCI: endpoint: Cleanup EPC features

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Date:   Mon, 07 Jan 2019 15:35:54 +0100
From:   Heiko Stuebner <heiko@...ech.de>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Alan Douglas <adouglas@...ence.com>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Cyrille Pitchen <cyrille.pitchen@...e-electrons.com>,
        Jia-Ju Bai <baijiaju1990@...il.com>,
        linux-omap@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 00/15] PCI: endpoint: Cleanup EPC features

Am Montag, 7. Januar 2019, 07:41:33 CET schrieb Kishon Vijay Abraham I:
> Hi Lorenzo,
> 
> The Endpoint controller driver uses features member in 'struct pci_epc'
> to advertise the list of supported features to the endpoint function
> driver.
> 
> There are a few shortcomings with this approach.
>   *) Certain endpoint controllers support fixed size BAR (e.g. TI's
>      AM654 uses Designware configuration with fixed size BAR). The
>      size of each BARs cannot be passed to the endpoint function
>      driver.
>   *) Too many macros for handling EPC features.
>      (EPC_FEATURE_NO_LINKUP_NOTIFIER, EPC_FEATURE_BAR_MASK,
>       EPC_FEATURE_MSIX_AVAILABLE, EPC_FEATURE_SET_BAR,
>       EPC_FEATURE_GET_BAR)
>   *) Endpoint controllers are directly modifying struct pci_epc
>      members. (I have plans to move struct pci_epc to
>      drivers/pci/endpoint so that pci_epc members are referenced
>      only by endpoint core).
> 
> To overcome the above shortcomings, introduced pci_epc_get_features()
> API, pci_epc_features structure and a ->get_features() callback.
> 
> Also added a patch to set BAR flags in pci_epf_alloc_space and
> remove it from pci-epf-test function driver.
> 
> Tested on TI's DRA7xx platform.

While I don't have that much PCI experience and hence cannot judge
this cleanup as a whole, I can at least say, that my Rockchip rk3399
still does find its PCIE-connected wifi card, so this series on rk3399

Tested-by: Heiko Stuebner <heiko@...ech.de>