linux-kernel - Re: [PATCH V3 4/5] PCI: dwc: Add API to notify core initialization completion

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Message-ID: <77748536-4f9a-1357-8180-91c1da2e912e@nvidia.com>
Date:   Mon, 24 Feb 2020 17:50:26 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>
CC:     <jingoohan1@...il.com>, <gustavo.pimentel@...opsys.com>,
        <andrew.murray@....com>, <bhelgaas@...gle.com>, <kishon@...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 V3 4/5] PCI: dwc: Add API to notify core initialization
 completion



On 2/24/2020 5:02 PM, Lorenzo Pieralisi wrote:
> External email: Use caution opening links or attachments
> 
> 
> On Mon, Feb 17, 2020 at 05:40:35PM +0530, Vidya Sagar wrote:
>> Add a new API dw_pcie_ep_init_notify() to let platform drivers
>> call it when the core is available for initialization.
>>
>> Signed-off-by: Vidya Sagar <vidyas@...dia.com>
>> Acked-by: Kishon Vijay Abraham I <kishon@...com>
>> ---
>> V3:
>> * Added Acked-by: Kishon Vijay Abraham I <kishon@...com>
>>
>> V2:
>> * None
>>
>>   drivers/pci/controller/dwc/pcie-designware-ep.c | 7 +++++++
>>   drivers/pci/controller/dwc/pcie-designware.h    | 5 +++++
>>   2 files changed, 12 insertions(+)
>>
>> diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
>> index 84a102df9f62..dfbb806c25bf 100644
>> --- a/drivers/pci/controller/dwc/pcie-designware-ep.c
>> +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
>> @@ -19,6 +19,13 @@ void dw_pcie_ep_linkup(struct dw_pcie_ep *ep)
>>        pci_epc_linkup(epc);
>>   }
>>
>> +void dw_pcie_ep_init_notify(struct dw_pcie_ep *ep)
>> +{
>> +     struct pci_epc *epc = ep->epc;
>> +
>> +     pci_epc_init_notify(epc);
>> +}
> 
> Do we really need this wrapper ? I would drop this code and I would
> appreciate if you could post tegra changes benefiting from this
> series, at the moment I don't see any user of this newly added
> infrastructure.
I've posted that series also for review
@ http://patchwork.ozlabs.org/project/linux-pci/list/?series=152889
Sorry if I have to create explicit dependency by some means. I'm not
aware of that and would like to know if that exists. All that I did was 
to mention this as a dependency for the other (Tegra change) series.

Thanks,
Vidya Sagar

> 
> Thanks,
> Lorenzo
> 
>>   static void __dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar,
>>                                   int flags)
>>   {
>> diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
>> index b67b7f756bc2..aa98fbd50807 100644
>> --- a/drivers/pci/controller/dwc/pcie-designware.h
>> +++ b/drivers/pci/controller/dwc/pcie-designware.h
>> @@ -412,6 +412,7 @@ static inline int dw_pcie_allocate_domains(struct pcie_port *pp)
>>   void dw_pcie_ep_linkup(struct dw_pcie_ep *ep);
>>   int dw_pcie_ep_init(struct dw_pcie_ep *ep);
>>   int dw_pcie_ep_init_complete(struct dw_pcie_ep *ep);
>> +void dw_pcie_ep_init_notify(struct dw_pcie_ep *ep);
>>   void dw_pcie_ep_exit(struct dw_pcie_ep *ep);
>>   int dw_pcie_ep_raise_legacy_irq(struct dw_pcie_ep *ep, u8 func_no);
>>   int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, u8 func_no,
>> @@ -434,6 +435,10 @@ static inline int dw_pcie_ep_init_complete(struct dw_pcie_ep *ep)
>>        return 0;
>>   }
>>
>> +static inline void dw_pcie_ep_init_notify(struct dw_pcie_ep *ep)
>> +{
>> +}
>> +
>>   static inline void dw_pcie_ep_exit(struct dw_pcie_ep *ep)
>>   {
>>   }
>> --
>> 2.17.1
>>