linux-kernel - Re: [PATCH 0/4] Add support to defer core initialization

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Message-ID: <550dd734-acd9-802a-f650-44c32b56b58a@nvidia.com>
Date:   Mon, 25 Nov 2019 10:03:46 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     "kishon@...com" <kishon@...com>
CC:     Jingoo Han <jingoohan1@...il.com>,
        "gustavo.pimentel@...opsys.com" <gustavo.pimentel@...opsys.com>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "andrew.murray@....com" <andrew.murray@....com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "thierry.reding@...il.com" <thierry.reding@...il.com>,
        "Jisheng.Zhang@...aptics.com" <Jisheng.Zhang@...aptics.com>,
        "jonathanh@...dia.com" <jonathanh@...dia.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kthota@...dia.com" <kthota@...dia.com>,
        "mmaddireddy@...dia.com" <mmaddireddy@...dia.com>,
        "sagar.tv@...il.com" <sagar.tv@...il.com>
Subject: Re: [PATCH 0/4] Add support to defer core initialization

On 11/18/2019 10:13 PM, Jingoo Han wrote:
> 
> 
> On 11/18/19, 1:55 AM, Vidya Sagar wrote:
>>
>> On 11/13/2019 2:38 PM, Vidya Sagar wrote:
>>> EPC/DesignWare core endpoint subsystems assume that the core registers are
>>> available always for SW to initialize. But, that may not be the case always.
>>> For example, Tegra194 hardware has the core running on a clock that is derived
>>> from reference clock that is coming into the endpoint system from host.
>>> Hence core is made available asynchronously based on when host system is going
>>> for enumeration of devices. To accommodate this kind of hardwares, support is
>>> required to defer the core initialization until the respective platform driver
>>> informs the EPC/DWC endpoint sub-systems that the core is indeed available for
>>> initiaization. This patch series is attempting to add precisely that.
>>> This series is based on Kishon's patch that adds notification mechanism
>>> support from EPC to EPF @ http://patchwork.ozlabs.org/patch/1109884/
>>>
>>> Vidya Sagar (4):
>>>     PCI: dwc: Add new feature to skip core initialization
>>>     PCI: endpoint: Add notification for core init completion
>>>     PCI: dwc: Add API to notify core initialization completion
>>>     PCI: pci-epf-test: Add support to defer core initialization
>>>
>>>    .../pci/controller/dwc/pcie-designware-ep.c   |  79 +++++++-----
>>>    drivers/pci/controller/dwc/pcie-designware.h  |  11 ++
>>>    drivers/pci/endpoint/functions/pci-epf-test.c | 114 ++++++++++++------
>>>    drivers/pci/endpoint/pci-epc-core.c           |  19 ++-
>>>    include/linux/pci-epc.h                       |   2 +
>>>    include/linux/pci-epf.h                       |   5 +
>>>    6 files changed, 164 insertions(+), 66 deletions(-)
>>>
>>
>> Hi Kishon / Gustavo / Jingoo,
>> Could you please take a look at this patch series?
> 
> You need a Ack from Kishon, because he made EP code.
Hi Kishon,
Could you please find time to review this series?

- Vidya Sagar
> 
> 
>> - Vidya Sagar