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

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Message-ID: <20231214100936.GI2938@thinkpad>
Date:   Thu, 14 Dec 2023 15:39:36 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Krishna Chaitanya Chundru <quic_krichai@...cinc.com>
Cc:     lpieralisi@...nel.org, kw@...ux.com, 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 Thu, Dec 14, 2023 at 03:10:01PM +0530, Krishna Chaitanya Chundru wrote:
> 
> 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.
> 

That's what being done here. Am I missing anything?

- Mani

> - Krishna Chaitanya.
> 
> >   	}
> >   	/* Register the MHI EP controller */

-- 
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