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

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Date:   Thu, 14 Dec 2023 15:10:01 +0530
From:   Krishna Chaitanya Chundru <quic_krichai@...cinc.com>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        <lpieralisi@...nel.org>, <kw@...ux.com>
CC:     <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


On 11/27/2023 6:15 PM, Manivannan Sadhasivam wrote:
> 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;

I think the read_async & write async should be updated inside the if 
condition where MHI_EPF_USE_DMA flag is set.

- Krishna Chaitanya.

>   	}
>   
>   	/* Register the MHI EP controller */