RE: [PATCH v2 07/10] PCI: layerscape: Modify the MSIX to the doorbell way

[Xiaowei Bao]

> -----Original Message-----
> From: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
> Sent: 2019å11æ5æ 20:38
> To: Kishon Vijay Abraham I <kishon@xxxxxx>
> Cc: Andrew Murray <andrew.murray@xxxxxxx>; Xiaowei Bao
> <xiaowei.bao@xxxxxxx>; gustavo.pimentel@xxxxxxxxxxxx;
> bhelgaas@xxxxxxxxxx; robh+dt@xxxxxxxxxx; mark.rutland@xxxxxxx;
> shawnguo@xxxxxxxxxx; Leo Li <leoyang.li@xxxxxxx>;
> lorenzo.pieralisi@xxxxxx; arnd@xxxxxxxx; gregkh@xxxxxxxxxxxxxxxxxxx; M.h.
> Lian <minghuan.lian@xxxxxxx>; Mingkai Hu <mingkai.hu@xxxxxxx>; Roy
> Zang <roy.zang@xxxxxxx>; jingoohan1@xxxxxxxxx;
> linux-pci@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx;
> linux-kernel@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx;
> linuxppc-dev@xxxxxxxxxxxxxxxx
> Subject: Re: [PATCH v2 07/10] PCI: layerscape: Modify the MSIX to the
> doorbell way
> 
> On Thu, Aug 29, 2019 at 10:43:18AM +0530, Kishon Vijay Abraham I wrote:
> > Gustavo,
> >
> > On 27/08/19 6:55 PM, Andrew Murray wrote:
> > > On Sat, Aug 24, 2019 at 12:08:40AM +0000, Xiaowei Bao wrote:
> > >>
> > >>
> > >>> -----Original Message-----
> > >>> From: Andrew Murray <andrew.murray@xxxxxxx>
> > >>> Sent: 2019å8æ23æ 21:58
> > >>> To: Xiaowei Bao <xiaowei.bao@xxxxxxx>
> > >>> Cc: bhelgaas@xxxxxxxxxx; robh+dt@xxxxxxxxxx;
> mark.rutland@xxxxxxx;
> > >>> shawnguo@xxxxxxxxxx; Leo Li <leoyang.li@xxxxxxx>; kishon@xxxxxx;
> > >>> lorenzo.pieralisi@xxxxxx; arnd@xxxxxxxx; gregkh@xxxxxxxxxxxxxxxxxxx;
> M.h.
> > >>> Lian <minghuan.lian@xxxxxxx>; Mingkai Hu <mingkai.hu@xxxxxxx>;
> Roy
> > >>> Zang <roy.zang@xxxxxxx>; jingoohan1@xxxxxxxxx;
> > >>> gustavo.pimentel@xxxxxxxxxxxx; linux-pci@xxxxxxxxxxxxxxx;
> > >>> devicetree@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> > >>> linux-arm-kernel@xxxxxxxxxxxxxxxxxxx;
> > >>> linuxppc-dev@xxxxxxxxxxxxxxxx
> > >>> Subject: Re: [PATCH v2 07/10] PCI: layerscape: Modify the MSIX to
> > >>> the doorbell way
> > >>>
> > >>> On Thu, Aug 22, 2019 at 07:22:39PM +0800, Xiaowei Bao wrote:
> > >>>> The layerscape platform use the doorbell way to trigger MSIX
> > >>>> interrupt in EP mode.
> > >>>>
> > >>>
> > >>> I have no problems with this patch, however...
> > >>>
> > >>> Are you able to add to this message a reason for why you are
> > >>> making this change? Did dw_pcie_ep_raise_msix_irq not work when
> > >>> func_no != 0? Or did it work yet dw_pcie_ep_raise_msix_irq_doorbell is
> more efficient?
> > >>
> > >> The fact is that, this driver is verified in ls1046a platform of
> > >> NXP before, and ls1046a don't support MSIX feature, so I set the
> > >> msix_capable of pci_epc_features struct is false, but in other
> > >> platform, e.g. ls1088a, it support the MSIX feature, I verified the MSIX
> feature in ls1088a, it is not OK, so I changed to another way. Thanks.
> > >
> > > Right, so the existing pci-layerscape-ep.c driver never supported
> > > MSIX yet it erroneously had a switch case statement to call
> > > dw_pcie_ep_raise_msix_irq which would never get used.
> > >
> > > Now that we're adding a platform with MSIX support the existing
> > > dw_pcie_ep_raise_msix_irq doesn't work (for this platform) so we are
> > > adding a different method.
> >
> > Gustavo, can you confirm dw_pcie_ep_raise_msix_irq() works for
> > designware as it didn't work for both me and Xiaowei?
> 
> This question needs an answer.

This question have answered by Gustavo in "[PATCH v3 08/11] PCI: layerscape: 
Modify the MSIX to the doorbell mode", please refer to the comments, due to
add a new patch for this sets of patch, this patch number changed from 07/10 of v2
to 08/11 of v3, sorry for causing your confuse.


Thanks 
Xiaowei  


> 
> Thanks,
> Lorenzo