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

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Message-ID: <SL2P216MB0105D49E39194C827D60B032AA4D0@SL2P216MB0105.KORP216.PROD.OUTLOOK.COM>
Date:   Mon, 18 Nov 2019 16:43:58 +0000
From:   Jingoo Han <jingoohan1@...il.com>
To:     Vidya Sagar <vidyas@...dia.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>,
        "kishon@...com" <kishon@...com>,
        "thierry.reding@...il.com" <thierry.reding@...il.com>
CC:     "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>,
        Han Jingoo <jingoohan1@...il.com>
Subject: Re: [PATCH 0/4] Add support to defer core initialization



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.


> - Vidya Sagar