2020-12-29 03:38:46

by Jisheng Zhang

Subject: [PATCH v2] PCI: dwc: Fix MSI not work after resume

After we move dw_pcie_msi_init() into core -- dw_pcie_host_init(), the
MSI stops working after resume. Because dw_pcie_host_init() is only
called once during probe. To fix this issue, we move dw_pcie_msi_init()
to dw_pcie_setup_rc().

Fixes: 59fbab1ae40e ("PCI: dwc: Move dw_pcie_msi_init() into core")
Signed-off-by: Jisheng Zhang <[email protected]>
---

Since v1:
- rebased on 5.11-rc1
- add Fixes tag

drivers/pci/controller/dwc/pcie-designware-host.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 8a84c005f32b..5240b5f0973d 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -423,7 +423,6 @@ int dw_pcie_host_init(struct pcie_port *pp)
}

dw_pcie_setup_rc(pp);
- dw_pcie_msi_init(pp);

if (!dw_pcie_link_up(pci) && pci->ops->start_link) {
ret = pci->ops->start_link(pci);
@@ -574,6 +573,8 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
}
}

+ dw_pcie_msi_init(pp);
+
/* Setup RC BARs */
dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0x00000004);
dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_1, 0x00000000);
--
2.30.0.rc2

2020-12-31 18:36:24

by Rob Herring (Arm)

Subject: Re: [PATCH v2] PCI: dwc: Fix MSI not work after resume

On Mon, Dec 28, 2020 at 8:36 PM Jisheng Zhang
<[email protected]> wrote:
>
> After we move dw_pcie_msi_init() into core -- dw_pcie_host_init(), the
> MSI stops working after resume. Because dw_pcie_host_init() is only
> called once during probe. To fix this issue, we move dw_pcie_msi_init()
> to dw_pcie_setup_rc().
>
> Fixes: 59fbab1ae40e ("PCI: dwc: Move dw_pcie_msi_init() into core")
> Signed-off-by: Jisheng Zhang <[email protected]>
> ---
>
> Since v1:
> - rebased on 5.11-rc1
> - add Fixes tag
>
> drivers/pci/controller/dwc/pcie-designware-host.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)

Reviewed-by: Rob Herring <[email protected]>

Bjorn, please pick up for 5.11.

Rob