Hi,
On Sunday 12 July 2015 04:01 PM, Jingoo Han wrote:
> 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.
Alright. Will change it that way in the next version.
Thanks
Kishon
>
> 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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