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From: Shawn Lin <shawn.lin@rock-chips.com>
To: Kishon Vijay Abraham I <kishon@ti.com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
	Gustavo Pimentel <gustavo.pimentel@synopsys.com>,
	Alan Douglas <adouglas@cadence.com>,
	Heiko Stuebner <heiko@sntech.de>
Cc: Jingoo Han <jingoohan1@gmail.com>,
	shawn.lin@rock-chips.com, linux-kernel@vger.kernel.org,
	linux-rockchip@lists.infradead.org, linux-pci@vger.kernel.org,
	Bjorn Helgaas <bhelgaas@google.com>,
	linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 00/15] PCI: endpoint: Cleanup EPC features
Date: Tue, 15 Jan 2019 09:52:41 +0800
Message-ID: <29d44805-9cfb-450c-e7b3-7556dc36fc40@rock-chips.com> (raw)
In-Reply-To: <20190114111513.21618-1-kishon@ti.com>


On 2019/1/14 19:14, Kishon Vijay Abraham I wrote:
> 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.
> 
> Changes from v1:
> *) Fixed helper function to return '0' (or BAR_0) for any incorrect
>     values in reserved BAR.
> *) Do not set_bar or alloc space for BARs if the BARs are reserved
> *) Fix incorrect check of epc_features in pci_epf_test_bind
> 
> Tested on TI's DRA7xx platform and AM654 platform. Support for PCIe
> in AM654 platform will be posted shortly.
> 


----8<-----

>   drivers/pci/controller/pcie-rockchip-ep.c     | 16 +++-

Acked-by: Shawn Lin <shawn.lin@rock-chips.com>




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  parent reply index

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-14 11:14 Kishon Vijay Abraham I
2019-01-14 11:14 ` [PATCH v2 01/15] PCI: endpoint: Add new pci_epc_ops to get " Kishon Vijay Abraham I
2019-01-14 11:15 ` [PATCH v2 02/15] PCI: dwc: Add ->get_features() callback function in dw_pcie_ep_ops Kishon Vijay Abraham I
2019-01-14 11:15 ` [PATCH v2 03/15] PCI: designware-plat: Populate ->get_features() dw_pcie_ep_ops Kishon Vijay Abraham I
2019-01-14 11:15 ` [PATCH v2 04/15] PCI: pci-dra7xx: " Kishon Vijay Abraham I
2019-01-14 11:15 ` [PATCH v2 05/15] PCI: rockchip: " Kishon Vijay Abraham I
2019-01-14 11:15 ` [PATCH v2 06/15] PCI: cadence: Populate ->get_features() cdns_pcie_epc_ops Kishon Vijay Abraham I
2019-01-14 11:15 ` [PATCH v2 07/15] PCI: endpoint: Add helper to get first unreserved BAR Kishon Vijay Abraham I
2019-01-14 11:15 ` [PATCH v2 08/15] PCI: endpoint: Fix pci_epf_alloc_space to set correct MEM TYPE flags Kishon Vijay Abraham I
2019-02-11 17:37   ` Lorenzo Pieralisi
2019-02-13 13:47     ` Kishon Vijay Abraham I
2019-02-14 16:29       ` Lorenzo Pieralisi
2019-02-15  6:19         ` Kishon Vijay Abraham I
2019-02-15  9:52           ` Lorenzo Pieralisi
2019-01-14 11:15 ` [PATCH v2 09/15] PCI: pci-epf-test: Remove setting epf_bar flags in function driver Kishon Vijay Abraham I
2019-01-14 11:15 ` [PATCH v2 10/15] PCI: pci-epf-test: Do not allocate next BARs memory if current BAR is 64Bit Kishon Vijay Abraham I
2019-01-14 11:15 ` [PATCH v2 11/15] PCI: pci-epf-test: Use pci_epc_get_features to get EPC features Kishon Vijay Abraham I
2019-01-14 11:15 ` [PATCH v2 12/15] PCI: cadence: Remove pci_epf_linkup from Cadence EP driver Kishon Vijay Abraham I
2019-01-14 11:15 ` [PATCH v2 13/15] PCI: rockchip: Remove pci_epf_linkup from Rockchip " Kishon Vijay Abraham I
2019-01-14 11:15 ` [PATCH v2 14/15] PCI: designware-plat: Remove setting epc->features in Designware plat " Kishon Vijay Abraham I
2019-01-14 11:15 ` [PATCH v2 15/15] PCI: endpoint: Remove features member in struct pci_epc Kishon Vijay Abraham I
2019-01-15  1:52 ` Shawn Lin [this message]
2019-02-11 10:19 ` [PATCH v2 00/15] PCI: endpoint: Cleanup EPC features Gustavo Pimentel
2019-02-11 12:37   ` Kishon Vijay Abraham I
2019-02-15 10:09 ` Lorenzo Pieralisi

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