RE: [PATCH v4 08/11] PCI: layerscape: Modify the MSIX to the doorbell mode

[Xiaowei Bao]

> -----Original Message-----
> From: Kishon Vijay Abraham I <kishon@xxxxxx>
> Sent: 2020å2æ28æ 19:41
> To: Xiaowei Bao <xiaowei.bao@xxxxxxx>; robh+dt@xxxxxxxxxx;
> mark.rutland@xxxxxxx; shawnguo@xxxxxxxxxx; Leo Li
> <leoyang.li@xxxxxxx>; lorenzo.pieralisi@xxxxxxx; M.h. Lian
> <minghuan.lian@xxxxxxx>; Mingkai Hu <mingkai.hu@xxxxxxx>; Roy Zang
> <roy.zang@xxxxxxx>; jingoohan1@xxxxxxxxx;
> gustavo.pimentel@xxxxxxxxxxxx; andrew.murray@xxxxxxx;
> linux-pci@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx;
> devicetree@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> linuxppc-dev@xxxxxxxxxxxxxxxx
> Subject: Re: [PATCH v4 08/11] PCI: layerscape: Modify the MSIX to the
> doorbell mode
> 
> Hi Xiaowei,
> 
> On 24/09/19 7:48 am, Xiaowei Bao wrote:
> > dw_pcie_ep_raise_msix_irq was never called in the exisitng driver
> > before, because the ls1046a platform don't support the MSIX feature
> > and msix_capable was always set to false.
> > Now that add the ls1088a platform with MSIX support, but the existing
> > dw_pcie_ep_raise_msix_irq doesn't work, so use the doorbell method to
> > support the MSIX feature.
> 
> 
> It does work after [1]. So the commit message might not be exactly true.

Got it, I will verify it with your patch, do you mean that I should correct the commit 
message? I think we can reserve my MSI-X patch, this patch can provide another 
MSI-X trigger way, and this way is clearly stated in the DWC manual, thanks, please
give your comments.

Thanks
Xiaowei

> 
> [1] ->
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore.ke
> rnel.org%2Fr%2F20200225081703.8857-1-kishon%40ti.com&amp;data=02%
> 7C01%7Cxiaowei.bao%40nxp.com%7C84191df0cd09451ef3e608d7bc427745
> %7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637184865969684
> 169&amp;sdata=K9fvbpQ4xuuZKhWT6UV2M4SVyHxQ3LjpuJQztktLaRI%3D&
> amp;reserved=0
> 
> Thanks
> Kishon
> 
> >
> > Signed-off-by: Xiaowei Bao <xiaowei.bao@xxxxxxx>
> > Reviewed-by: Andrew Murray <andrew.murray@xxxxxxx>
> > ---
> > v2:
> >  - No change
> > v3:
> >  - Modify the commit message make it clearly.
> > v4:
> >  - No change
> >
> >  drivers/pci/controller/dwc/pci-layerscape-ep.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/pci/controller/dwc/pci-layerscape-ep.c
> > b/drivers/pci/controller/dwc/pci-layerscape-ep.c
> > index 1e07287..5f0cb99 100644
> > --- a/drivers/pci/controller/dwc/pci-layerscape-ep.c
> > +++ b/drivers/pci/controller/dwc/pci-layerscape-ep.c
> > @@ -79,7 +79,8 @@ static int ls_pcie_ep_raise_irq(struct dw_pcie_ep *ep,
> u8 func_no,
> >  	case PCI_EPC_IRQ_MSI:
> >  		return dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num);
> >  	case PCI_EPC_IRQ_MSIX:
> > -		return dw_pcie_ep_raise_msix_irq(ep, func_no, interrupt_num);
> > +		return dw_pcie_ep_raise_msix_irq_doorbell(ep, func_no,
> > +							  interrupt_num);
> >  	default:
> >  		dev_err(pci->dev, "UNKNOWN IRQ type\n");
> >  		return -EINVAL;
> >