Re: [PATCH] bus: mhi: pci_generic: Implement PCI shutdown callback

[Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>]

On Fri, Mar 19, 2021 at 04:50:37PM +0100, Loic Poulain wrote:
> Deinit the device on shutdown to halt MHI/PCI operation on device
> side. This change fixes floating device state with some hosts that
> do not fully shutdown PCIe device when rebooting.
> 
> Signed-off-by: Loic Poulain <loic.poulain@linaro.org>

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

Thanks,
Mani

> ---
>  drivers/bus/mhi/pci_generic.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/bus/mhi/pci_generic.c b/drivers/bus/mhi/pci_generic.c
> index cbd2224..b104ab8 100644
> --- a/drivers/bus/mhi/pci_generic.c
> +++ b/drivers/bus/mhi/pci_generic.c
> @@ -532,6 +532,12 @@ static void mhi_pci_remove(struct pci_dev *pdev)
>  	mhi_unregister_controller(mhi_cntrl);
>  }
>  
> +static void mhi_pci_shutdown(struct pci_dev *pdev)
> +{
> +	mhi_pci_remove(pdev);
> +	pci_set_power_state(pdev, PCI_D3hot);
> +}
> +
>  static void mhi_pci_reset_prepare(struct pci_dev *pdev)
>  {
>  	struct mhi_pci_device *mhi_pdev = pci_get_drvdata(pdev);
> @@ -704,6 +710,7 @@ static struct pci_driver mhi_pci_driver = {
>  	.id_table	= mhi_pci_id_table,
>  	.probe		= mhi_pci_probe,
>  	.remove		= mhi_pci_remove,
> +	.shutdown	= mhi_pci_shutdown,
>  	.err_handler	= &mhi_pci_err_handler,
>  	.driver.pm	= &mhi_pci_pm_ops
>  };
> -- 
> 2.7.4
>