linux-kernel - Re: [PATCH 6/9] PCI: epf-mhi: Enable MHI async read/write support

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Message-ID: <20231213184829.GA924726@rocinante>
Date:   Thu, 14 Dec 2023 03:48:29 +0900
From:   Krzysztof Wilczyński <kw@...ux.com>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     lpieralisi@...nel.org, kishon@...nel.org, bhelgaas@...gle.com,
        mhi@...ts.linux.dev, linux-arm-msm@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/9] PCI: epf-mhi: Enable MHI async read/write support

Hello,

Manivannan, you will be taking this through the MHI tree, correct?

> Now that both eDMA and iATU are prepared to support async transfer, let's
> enable MHI async read/write by supplying the relevant callbacks.
> 
> In the absence of eDMA, iATU will be used for both sync and async
> operations.
> 
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> ---
>  drivers/pci/endpoint/functions/pci-epf-mhi.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/pci/endpoint/functions/pci-epf-mhi.c b/drivers/pci/endpoint/functions/pci-epf-mhi.c
> index 3d09a37e5f7c..d3d6a1054036 100644
> --- a/drivers/pci/endpoint/functions/pci-epf-mhi.c
> +++ b/drivers/pci/endpoint/functions/pci-epf-mhi.c
> @@ -766,12 +766,13 @@ static int pci_epf_mhi_link_up(struct pci_epf *epf)
>  	mhi_cntrl->raise_irq = pci_epf_mhi_raise_irq;
>  	mhi_cntrl->alloc_map = pci_epf_mhi_alloc_map;
>  	mhi_cntrl->unmap_free = pci_epf_mhi_unmap_free;
> +	mhi_cntrl->read_sync = mhi_cntrl->read_async = pci_epf_mhi_iatu_read;
> +	mhi_cntrl->write_sync = mhi_cntrl->write_async = pci_epf_mhi_iatu_write;
>  	if (info->flags & MHI_EPF_USE_DMA) {
>  		mhi_cntrl->read_sync = pci_epf_mhi_edma_read;
>  		mhi_cntrl->write_sync = pci_epf_mhi_edma_write;
> -	} else {
> -		mhi_cntrl->read_sync = pci_epf_mhi_iatu_read;
> -		mhi_cntrl->write_sync = pci_epf_mhi_iatu_write;
> +		mhi_cntrl->read_async = pci_epf_mhi_edma_read_async;
> +		mhi_cntrl->write_async = pci_epf_mhi_edma_write_async;
>  	}

Looks good!

Reviewed-by: Krzysztof Wilczyński <kw@...ux.com>

	Krzysztof