linux-kernel - Re: [PATCH v3 6/7] PCI: dwc: Introduce Configurable DMA mask

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Date:   Thu, 23 Feb 2023 19:14:31 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Elad Nachman <enachman@...vell.com>, thomas.petazzoni@...tlin.com,
        bhelgaas@...gle.com, lpieralisi@...nel.org, robh@...nel.org,
        kw@...ux.com, krzysztof.kozlowski+dt@...aro.org,
        linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 6/7] PCI: dwc: Introduce Configurable DMA mask

On 23/02/2023 19:05, Elad Nachman wrote:
> From: Elad Nachman <enachman@...vell.com>
> 
> Some devices, such as AC5 and AC5X have their physical DDR memory
> start at address 0x2_0000_0000 . In order to have the DMA

There is no space before full stop and comma. Also fix wrapping.

> coherent allocation succeed later, a different DMA mask is
> required, as defined in the DT file for such SOCs.
> If not defined, fallback to 32-bit as previously done in the code.
> DT property is called num-dmamask , and can range between 33 and 64.
> 
> Signed-off-by: Elad Nachman <enachman@...vell.com>
> ---
>  .../pci/controller/dwc/pcie-designware-host.c | 23 ++++++++++++++-----
>  1 file changed, 17 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index 9952057c8819..ac851b065325 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -204,7 +204,6 @@ static int dw_pcie_irq_domain_alloc(struct irq_domain *domain,
>  				    pp->msi_irq_chip,
>  				    pp, handle_edge_irq,
>  				    NULL, NULL);
> -

How this is related to the commit?

>  	return 0;
>  }
>  
> @@ -250,7 +249,6 @@ int dw_pcie_allocate_domains(struct dw_pcie_rp *pp)
>  		irq_domain_remove(pp->irq_domain);
>  		return -ENOMEM;
>  	}
> -

Same problem... and later in the code as well.

Best regards,
Krzysztof