linux-kernel - Re: [PATCH] bus: mhi: host: pci

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Message-ID: <20241202093517.qhiy7larutekuk2l@thinkpad>
Date: Mon, 2 Dec 2024 15:05:17 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Johan Hovold <johan+linaro@...nel.org>
Cc: mhi@...ts.linux.dev, linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org, Mayank Rana <quic_mrana@...cinc.com>
Subject: Re: [PATCH] bus: mhi: host: pci_generic: fix MHI BAR mapping

On Sun, Dec 01, 2024 at 06:11:20PM +0100, Johan Hovold wrote:
> A recent change converting the MHI pci_generic driver to use
> pcim_iomap_region() failed to update the BAR parameter which is an index
> rather than a mask.
> 

That's silly on me. Thanks for the fix!

> This specifically broke the modem on machines like the Lenovo ThinkPad
> X13s and x1e80100 CRD:
> 
> 	mhi-pci-generic 0004:01:00.0: failed to map pci region: -22
> 	mhi-pci-generic 0004:01:00.0: probe with driver mhi-pci-generic failed with error -22
> 
> Fixes: bd23e836423e ("bus: mhi: host: pci_generic: Use pcim_iomap_region() to request and map MHI BAR")
> Cc: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> Cc: Mayank Rana <quic_mrana@...cinc.com>
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

> ---
> 
> The offending patch was marked as "Compile tested only", but that just
> makes you wonder *why* the patch was never tested...
> 

Because I didn't had a modem platform to test my change and since it was a
simple API conversion, I merged it after some time.

- Mani

> 	https://lore.kernel.org/all/20241004023351.6946-1-manivannan.sadhasivam@linaro.org/
> 
> Johan
> 
> 
> #regzbot introduced: bd23e836423e
> 
> 
>  drivers/bus/mhi/host/pci_generic.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/bus/mhi/host/pci_generic.c b/drivers/bus/mhi/host/pci_generic.c
> index 07645ce2119a..56ba4192c89c 100644
> --- a/drivers/bus/mhi/host/pci_generic.c
> +++ b/drivers/bus/mhi/host/pci_generic.c
> @@ -917,7 +917,7 @@ static int mhi_pci_claim(struct mhi_controller *mhi_cntrl,
>  		return err;
>  	}
>  
> -	mhi_cntrl->regs = pcim_iomap_region(pdev, 1 << bar_num, pci_name(pdev));
> +	mhi_cntrl->regs = pcim_iomap_region(pdev, bar_num, pci_name(pdev));
>  	if (IS_ERR(mhi_cntrl->regs)) {
>  		err = PTR_ERR(mhi_cntrl->regs);
>  		dev_err(&pdev->dev, "failed to map pci region: %d\n", err);
> -- 
> 2.45.2
> 

-- 
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