Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Message-ID: <1d0bdd8d-0d6f-418a-e219-de71850d847a@quicinc.com>
Date:   Fri, 7 Jul 2023 16:30:46 +0530
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101
 Thunderbird/91.13.1
Subject: Re: [PATCH v2 7/8] PCI: epf-mhi: Add wakeup host op
Content-Language: en-US
To:     Manivannan Sadhasivam <mani@kernel.org>
CC:     <manivannan.sadhasivam@linaro.org>, <helgaas@kernel.org>,
        <linux-pci@vger.kernel.org>, <linux-arm-msm@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>, <quic_vbadigan@quicinc.com>,
        <quic_nitegupt@quicinc.com>, <quic_skananth@quicinc.com>,
        <quic_ramkri@quicinc.com>, <krzysztof.kozlowski@linaro.org>,
        "Lorenzo Pieralisi" <lpieralisi@kernel.org>,
        =?UTF-8?Q?Krzysztof_Wilczy=c5=84ski?= <kw@linux.com>,
        Kishon Vijay Abraham I <kishon@kernel.org>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Jeffrey Hugo <quic_jhugo@quicinc.com>,
        "open list:MHI BUS" <mhi@lists.linux.dev>
References: <1688122331-25478-1-git-send-email-quic_krichai@quicinc.com>
 <1688122331-25478-8-git-send-email-quic_krichai@quicinc.com>
 <20230707061448.GF6001@thinkpad>
From:   Krishna Chaitanya Chundru <quic_krichai@quicinc.com>
In-Reply-To: <20230707061448.GF6001@thinkpad>
Content-Type: text/plain; charset="UTF-8"; format=flowed
Content-Transfer-Encoding: 7bit
Precedence: bulk


On 7/7/2023 11:44 AM, Manivannan Sadhasivam wrote:
> On Fri, Jun 30, 2023 at 04:22:10PM +0530, Krishna chaitanya chundru wrote:
>> Add wakeup host op for MHI EPF.
>> If the D-state is in D3cold toggle wake signal, otherwise send PME.
>>
>> Signed-off-by: Krishna chaitanya chundru <quic_krichai@quicinc.com>
>> ---
>>   drivers/pci/endpoint/functions/pci-epf-mhi.c | 19 +++++++++++++++++++
>>   include/linux/mhi_ep.h                       |  1 +
>>   2 files changed, 20 insertions(+)
>>
>> diff --git a/drivers/pci/endpoint/functions/pci-epf-mhi.c b/drivers/pci/endpoint/functions/pci-epf-mhi.c
>> index 64ff37d..deb742c 100644
>> --- a/drivers/pci/endpoint/functions/pci-epf-mhi.c
>> +++ b/drivers/pci/endpoint/functions/pci-epf-mhi.c
>> @@ -237,6 +237,24 @@ static int pci_epf_mhi_write_to_host(struct mhi_ep_cntrl *mhi_cntrl,
>>   	return 0;
>>   }
>>   
>> +static int pci_epf_mhi_wakeup_host(struct mhi_ep_cntrl *mhi_cntrl)
>> +{
>> +	struct pci_epf_mhi *epf_mhi = to_epf_mhi(mhi_cntrl);
>> +	struct pci_epf *epf = epf_mhi->epf;
>> +	struct pci_epc *epc = epf->epc;
>> +	int ret;
>> +
>> +	if (mhi_cntrl->dstate == PCI_D3cold)
>> +		ret = pci_epc_wakeup_host(epc, epf->func_no,
>> +					epf->vfunc_no, PCI_WAKEUP_TOGGLE_WAKE);
>> +	else
>> +		ret = pci_epc_wakeup_host(epc, epf->func_no,
>> +					epf->vfunc_no, PCI_WAKEUP_SEND_PME);
>> +
> If the wakeup argument is of type bool (ie. bool use_pme), then
>
> 	wakeup = (mhi_cntrl->dstate == PCI_D3cold) ? false : true;
>
> 	return pci_epc_wakeup_host(epc, epf->func_no, epf->vfunc_no, state);
>
> - Mani

better to use type as it as it has more readability

but I have taken your inputs here and will change the code as suggetsed.

- KC

>> +	return ret;
>> +
>> +}
>> +
>>   static int pci_epf_mhi_core_init(struct pci_epf *epf)
>>   {
>>   	struct pci_epf_mhi *epf_mhi = epf_get_drvdata(epf);
>> @@ -293,6 +311,7 @@ static int pci_epf_mhi_link_up(struct pci_epf *epf)
>>   	mhi_cntrl->unmap_free = pci_epf_mhi_unmap_free;
>>   	mhi_cntrl->read_from_host = pci_epf_mhi_read_from_host;
>>   	mhi_cntrl->write_to_host = pci_epf_mhi_write_to_host;
>> +	mhi_cntrl->wakeup_host = pci_epf_mhi_wakeup_host;
>>   
>>   	/* Register the MHI EP controller */
>>   	ret = mhi_ep_register_controller(mhi_cntrl, info->config);
>> diff --git a/include/linux/mhi_ep.h b/include/linux/mhi_ep.h
>> index c3a0685..e353c429 100644
>> --- a/include/linux/mhi_ep.h
>> +++ b/include/linux/mhi_ep.h
>> @@ -137,6 +137,7 @@ struct mhi_ep_cntrl {
>>   			   void __iomem *virt, size_t size);
>>   	int (*read_from_host)(struct mhi_ep_cntrl *mhi_cntrl, u64 from, void *to, size_t size);
>>   	int (*write_to_host)(struct mhi_ep_cntrl *mhi_cntrl, void *from, u64 to, size_t size);
>> +	int (*wakeup_host)(struct mhi_ep_cntrl *mhi_cntrl);
>>   
>>   	enum mhi_state mhi_state;
>>   
>> -- 
>> 2.7.4
>>