Re: [PATCH stable 5.15.y] PCI: dwc: Restore MSI Receiver mask during resume

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Sat, Aug 03, 2024 at 07:28:52PM +0800, Jisheng Zhang wrote:
> commit 815953dc2011ad7a34de355dfa703dcef1085219 upstream
> 
> If a host that uses the IP's integrated MSI Receiver lost power
> during suspend, we call dw_pcie_setup_rc() to reinit the RC. But
> dw_pcie_setup_rc() always sets pp->irq_mask[ctrl] to ~0, so the mask
> register is always set as 0xffffffff incorrectly, thus the MSI can't
> work after resume.
> 
> Fix this issue by moving pp->irq_mask[ctrl] initialization to
> dw_pcie_host_init() so we can correctly set the mask reg during both
> boot and resume.
> 
> Tested-by: Richard Zhu <hongxing.zhu@nxp.com>
> Link: https://lore.kernel.org/r/20211226074019.2556-1-jszhang@kernel.org
> Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
> ---
>  drivers/pci/controller/dwc/pcie-designware-host.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 

Now queued up, thanks.

greg k-h