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SubjectRe: [PATCH v4 3/9] PCI: epf-mhi: Add support for handling D-state notify from EPC
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On 7/28/2023 9:39 AM, Manivannan Sadhasivam wrote:
> On Thu, Jul 13, 2023 at 12:40:12PM +0530, Krishna chaitanya chundru wrote:
>> Add support for handling D-state notify for MHI EPF.
>>
>> Signed-off-by: Krishna chaitanya chundru <quic_krichai@quicinc.com>
>> ---
>> drivers/pci/endpoint/functions/pci-epf-mhi.c | 11 +++++++++++
>> include/linux/mhi_ep.h | 3 +++
>> 2 files changed, 14 insertions(+)
>>
>> diff --git a/drivers/pci/endpoint/functions/pci-epf-mhi.c b/drivers/pci/endpoint/functions/pci-epf-mhi.c
>> index 9c1f5a1..ee91bfc 100644
>> --- a/drivers/pci/endpoint/functions/pci-epf-mhi.c
>> +++ b/drivers/pci/endpoint/functions/pci-epf-mhi.c
>> @@ -339,6 +339,16 @@ static int pci_epf_mhi_bme(struct pci_epf *epf)
>> return 0;
>> }
>>
>> +static int pci_epf_mhi_dstate_notify(struct pci_epf *epf, pci_power_t state)
>> +{
>> + struct pci_epf_mhi *epf_mhi = epf_get_drvdata(epf);
>> + struct mhi_ep_cntrl *mhi_cntrl = &epf_mhi->mhi_cntrl;
>> +
>> + mhi_cntrl->dstate = state;
> Where is this variable being used? Also, don't we need any locking?
>
> - Mani

we are using this variable in wakeup host op which is introduced on
patch [PATCH v4 8/9] PCI: epf-mhi: Add wakeup host op

I will add lock in my next series.

- KC

>
>> +
>> + return 0;
>> +}
>> +
>> static int pci_epf_mhi_bind(struct pci_epf *epf)
>> {
>> struct pci_epf_mhi *epf_mhi = epf_get_drvdata(epf);
>> @@ -394,6 +404,7 @@ static struct pci_epc_event_ops pci_epf_mhi_event_ops = {
>> .link_up = pci_epf_mhi_link_up,
>> .link_down = pci_epf_mhi_link_down,
>> .bme = pci_epf_mhi_bme,
>> + .dstate_notify = pci_epf_mhi_dstate_notify,
>> };
>>
>> static int pci_epf_mhi_probe(struct pci_epf *epf,
>> diff --git a/include/linux/mhi_ep.h b/include/linux/mhi_ep.h
>> index f198a8a..c3a0685 100644
>> --- a/include/linux/mhi_ep.h
>> +++ b/include/linux/mhi_ep.h
>> @@ -8,6 +8,7 @@
>>
>> #include <linux/dma-direction.h>
>> #include <linux/mhi.h>
>> +#include <linux/pci.h>
>>
>> #define MHI_EP_DEFAULT_MTU 0x8000
>>
>> @@ -139,6 +140,8 @@ struct mhi_ep_cntrl {
>>
>> enum mhi_state mhi_state;
>>
>> + pci_power_t dstate;
>> +
>> u32 max_chan;
>> u32 mru;
>> u32 event_rings;
>> --
>> 2.7.4
>>

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