linux-kernel - Re: [PATCH V4 1/2] PCI: dwc: Add API support to de-initialize host

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Date:   Tue, 7 May 2019 11:19:23 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>
CC:     <jingoohan1@...il.com>, <gustavo.pimentel@...opsys.com>,
        <bhelgaas@...gle.com>, <Jisheng.Zhang@...aptics.com>,
        <thierry.reding@...il.com>, <linux-pci@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <kthota@...dia.com>,
        <mmaddireddy@...dia.com>, <sagar.tv@...il.com>
Subject: Re: [PATCH V4 1/2] PCI: dwc: Add API support to de-initialize host

On 5/3/2019 4:53 PM, Lorenzo Pieralisi wrote:
> On Thu, May 02, 2019 at 10:34:25PM +0530, Vidya Sagar wrote:
>> Add an API to group all the tasks to be done to de-initialize host which
>> can then be called by any DesignWare core based driver implementations
>> while adding .remove() support in their respective drivers.
>>
>> Signed-off-by: Vidya Sagar <vidyas@...dia.com>
>> Acked-by: Gustavo Pimentel <gustavo.pimentel@...opsys.com>
>> ---
>> Changes from v3:
>> * Added check if (pci_msi_enabled() && !pp->ops->msi_host_init) before calling
>>    dw_pcie_free_msi() API to mimic init path
>>
>> Changes from v2:
>> * Rebased on top of linux-next top of the tree branch
>>
>> Changes from v1:
>> * s/Designware/DesignWare
>>
>>   drivers/pci/controller/dwc/pcie-designware-host.c | 8 ++++++++
>>   drivers/pci/controller/dwc/pcie-designware.h      | 5 +++++
>>   2 files changed, 13 insertions(+)
> 
> Series doesn't apply to v5.1-rc1, what's based on ? I suspect
> there is a dependency on pci/keystone, given the tight timeline
> for the merge window, would you mind postponing it to v5.3 ?
> 
> I do not think it is urgent, I am happy to create a branch
> for it as soon as v5.2-rc1 is released.
I rebased my changes on top of linux-next. I see that they have conflicts
on top of v5.1-rc1. Do you want me to rebase them on top of v5.1-rc1 instead
of linux-next?
I'm fine with v5.2-rc1 as well.

> 
> Thanks,
> Lorenzo
> 
>> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
>> index 77db32529319..d069e4290180 100644
>> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
>> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
>> @@ -496,6 +496,14 @@ int dw_pcie_host_init(struct pcie_port *pp)
>>   	return ret;
>>   }
>>   
>> +void dw_pcie_host_deinit(struct pcie_port *pp)
>> +{
>> +	pci_stop_root_bus(pp->root_bus);
>> +	pci_remove_root_bus(pp->root_bus);
>> +	if (pci_msi_enabled() && !pp->ops->msi_host_init)
>> +		dw_pcie_free_msi(pp);
>> +}
>> +
>>   static int dw_pcie_access_other_conf(struct pcie_port *pp, struct pci_bus *bus,
>>   				     u32 devfn, int where, int size, u32 *val,
>>   				     bool write)
>> diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
>> index deab426affd3..4f48ec78c7b9 100644
>> --- a/drivers/pci/controller/dwc/pcie-designware.h
>> +++ b/drivers/pci/controller/dwc/pcie-designware.h
>> @@ -348,6 +348,7 @@ void dw_pcie_msi_init(struct pcie_port *pp);
>>   void dw_pcie_free_msi(struct pcie_port *pp);
>>   void dw_pcie_setup_rc(struct pcie_port *pp);
>>   int dw_pcie_host_init(struct pcie_port *pp);
>> +void dw_pcie_host_deinit(struct pcie_port *pp);
>>   int dw_pcie_allocate_domains(struct pcie_port *pp);
>>   #else
>>   static inline irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
>> @@ -372,6 +373,10 @@ static inline int dw_pcie_host_init(struct pcie_port *pp)
>>   	return 0;
>>   }
>>   
>> +static inline void dw_pcie_host_deinit(struct pcie_port *pp)
>> +{
>> +}
>> +
>>   static inline int dw_pcie_allocate_domains(struct pcie_port *pp)
>>   {
>>   	return 0;
>> -- 
>> 2.17.1
>>