On Friday, July 03, 2015 8:04 PM, Kishon Vijay Abraham I wrote:
>
> Certain platforms require MSE bit to be cleared to set the master
> in standby mode. (In DRA7xx TRM_vE, section 24.9.4.5.2.2.1 PCIe
This patch is a work-around specific for DRA7xx chips?
If so, please move this patch to 'pci-dra7xx.c'.
I don't want to include chip-specific codes, because
'pcie-designware.c' is designed for including common codes.
Best regards,
Jingoo Han
> Controller Master Standby Behavior advises to use the clearing
> of the local MSE bit to set the master in standby. Without this
> some of the clocks do not idle).
>
> Cleared the MSE bit on suspend and enabled it back on resume.
> This is required to get suspend/resume working.
>
> Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx>
> Signed-off-by: Sekhar Nori <nsekhar@xxxxxx>
> ---
> drivers/pci/host/pcie-designware.c | 20 ++++++++++++++++++++
> drivers/pci/host/pcie-designware.h | 2 ++
> 2 files changed, 22 insertions(+)
>
> diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
> index 69486be..cfb2bd6 100644
> --- a/drivers/pci/host/pcie-designware.c
> +++ b/drivers/pci/host/pcie-designware.c
> @@ -811,6 +811,26 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
> dw_pcie_writel_rc(pp, val, PCI_COMMAND);
> }
>
> +void dw_pcie_suspend_rc(struct pcie_port *pp)
> +{
> + u32 val;
> +
> + /* clear MSE */
> + dw_pcie_readl_rc(pp, PCI_COMMAND, &val);
> + val &= ~PCI_COMMAND_MEMORY;
> + dw_pcie_writel_rc(pp, val, PCI_COMMAND);
> +}
> +
> +void dw_pcie_resume_rc(struct pcie_port *pp)
> +{
> + u32 val;
> +
> + /* set MSE */
> + dw_pcie_readl_rc(pp, PCI_COMMAND, &val);
> + val |= PCI_COMMAND_MEMORY;
> + dw_pcie_writel_rc(pp, val, PCI_COMMAND);
> +}
> +
> MODULE_AUTHOR("Jingoo Han <jg1.han@xxxxxxxxxxx>");
> MODULE_DESCRIPTION("Designware PCIe host controller driver");
> MODULE_LICENSE("GPL v2");
> diff --git a/drivers/pci/host/pcie-designware.h b/drivers/pci/host/pcie-designware.h
> index d0bbd27..0df2dfa 100644
> --- a/drivers/pci/host/pcie-designware.h
> +++ b/drivers/pci/host/pcie-designware.h
> @@ -83,5 +83,7 @@ void dw_pcie_msi_init(struct pcie_port *pp);
> int dw_pcie_link_up(struct pcie_port *pp);
> void dw_pcie_setup_rc(struct pcie_port *pp);
> int dw_pcie_host_init(struct pcie_port *pp);
> +void dw_pcie_suspend_rc(struct pcie_port *pp);
> +void dw_pcie_resume_rc(struct pcie_port *pp);
>
> #endif /* _PCIE_DESIGNWARE_H */
> --
> 1.7.9.5
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