linux-kernel - Re: [PATCH V2 0/5] Add support to defer core initialization

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Message-ID: <680a58ec-5d09-3e3b-2fd6-544c32732818@nvidia.com>
Date:   Thu, 23 Jan 2020 14:54:30 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     <kishon@...com>
CC:     <jingoohan1@...il.com>, <gustavo.pimentel@...opsys.com>,
        <lorenzo.pieralisi@....com>, <andrew.murray@....com>,
        <bhelgaas@...gle.com>, <thierry.reding@...il.com>,
        <Jisheng.Zhang@...aptics.com>, <jonathanh@...dia.com>,
        <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <kthota@...dia.com>, <mmaddireddy@...dia.com>, <sagar.tv@...il.com>
Subject: Re: [PATCH V2 0/5] Add support to defer core initialization

Hi Kishon,
Apologies for pinging again. Could you please review this series?

Thanks,
Vidya Sagar

On 1/11/2020 5:18 PM, Vidya Sagar wrote:
> Hi Kishon,
> Could you please review this series?
> 
> Also, this series depends on the following change of yours
> http://patchwork.ozlabs.org/patch/1109884/
> Whats the plan to get this merged?
> 
> Thanks,
> Vidya Sagar
> 
> On 1/3/20 3:37 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 (5):
>>    PCI: endpoint: Add core init notifying feature
>>    PCI: dwc: Refactor core initialization code for EP mode
>>    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 | 118 ++++++++++++------
>>   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(+), 70 deletions(-)
>>