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 12:25:38 +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 5/7/2019 11:19 AM, Vidya Sagar wrote:
> 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.I forgot to mention that these changes are made on top of Jisheng's patches
FWIW, Jisheng's patches are approved and applied to pci/dwc for v5.2
https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1968324.html

> 
>>
>> 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
>>>
>