linux-kernel - Re: [PATCH v4 3/9] PCI: epf-mhi: Add support for handling D-state notify from EPC

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Message-ID: <20230728040949.GF4433@thinkpad>
Date:   Fri, 28 Jul 2023 09:39:49 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     Krishna chaitanya chundru <quic_krichai@...cinc.com>
Cc:     manivannan.sadhasivam@...aro.org, helgaas@...nel.org,
        linux-pci@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, quic_vbadigan@...cinc.com,
        quic_nitegupt@...cinc.com, quic_skananth@...cinc.com,
        quic_ramkri@...cinc.com, krzysztof.kozlowski@...aro.org,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jeffrey Hugo <quic_jhugo@...cinc.com>,
        "open list:MHI BUS" <mhi@...ts.linux.dev>
Subject: Re: [PATCH v4 3/9] PCI: epf-mhi: Add support for handling D-state
 notify from EPC

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@...cinc.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

> +
> +	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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