Re: [RFC] PCI: pci-imx6: Add delay to workaround kernel hang

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hi Fabio,

Am Dienstag, den 24.06.2014, 16:18 -0300 schrieb Fabio Estevam:
> From: Fabio Estevam <fabio.estevam@xxxxxxxxxxxxx>
> 
> When the mx6 PCI conctroller is initialized in the bootloader we see a kernel 
> hang inside imx6_add_pcie_port().
> 
> Adding a 30ms delay allows the kernel to boot.
> 
> Suggested-by: David Müller <d.mueller@xxxxxxxxx>
> Signed-off-by: Fabio Estevam <fabio.estevam@xxxxxxxxxxxxx>
> ---
> I am happy to get feedback on how to properly fix this.
> 
> Thanks
> 
>  drivers/pci/host/pci-imx6.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
> index a568efa..669f771 100644
> --- a/drivers/pci/host/pci-imx6.c
> +++ b/drivers/pci/host/pci-imx6.c
> @@ -507,6 +507,8 @@ static int __init imx6_add_pcie_port(struct pcie_port *pp,
>  	pp->root_bus_nr = -1;
>  	pp->ops = &imx6_pcie_host_ops;
>  
> +	usleep_range(25000, 30000);
> +
>  	ret = dw_pcie_host_init(pp);
>  	if (ret) {
>  		dev_err(&pdev->dev, "failed to initialize host\n");

I would suspect the issue to be somewhere in imx6_pcie_host_init(). Can
you move the delay there (and to different positions in this function)
to narrow down where the hang happens?

Regards,
Lucas
-- 
Pengutronix e.K.             | Lucas Stach                 |
Industrial Linux Solutions   | http://www.pengutronix.de/  |

--
To unsubscribe from this list: send the line "unsubscribe linux-pci" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [DMA Engine]     [Linux Coverity]     [Linux USB]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [Greybus]

  Powered by Linux