linux-kernel - Re: [PATCH v2 2/2] PCI: xilinx-nwl: Increase ECAM size to accommodate 256 buses.

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Date:   Tue, 8 Aug 2023 10:49:39 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Thippeswamy Havalige <thippeswamy.havalige@....com>
Cc:     linux-kernel@...r.kernel.org, robh+dt@...nel.org,
        bhelgaas@...gle.com, krzysztof.kozlowski@...aro.org,
        linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
        lpieralisi@...nel.org, bharat.kumar.gogada@....com,
        michal.simek@....com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 2/2] PCI: xilinx-nwl: Increase ECAM size to
 accommodate 256 buses.

On Tue, Aug 08, 2023 at 04:07:33PM +0530, Thippeswamy Havalige wrote:
> Our controller is expecting ECAM size to be programmed by software. By
> programming "NWL_ECAM_VALUE_DEFAULT  12" controller can access up to 16MB
> ECAM region which is used to detect 16 buses, so by updating
> "NWL_ECAM_VALUE_DEFAULT" to 16 so that controller can access up to 256MB
> ECAM region to detect 256 buses.
> 
> Signed-off-by: Thippeswamy Havalige <thippeswamy.havalige@....com>
> Signed-off-by: Bharat Kumar Gogada <bharat.kumar.gogada@....com>

1) I'm still concerned that this adds a revlock with the corresponding
DT change.  Is that acceptable?  Should it be mentioned in the commit
log?

2) Lorenzo or Krzysztof, if/when you apply this, please drop the
period at the end of the subject line.  I've mentioned it several
times to no avail.

> ---
> changes in v2:
> - Update this changes in a seperate patch.
> ---
>  drivers/pci/controller/pcie-xilinx-nwl.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/pcie-xilinx-nwl.c b/drivers/pci/controller/pcie-xilinx-nwl.c
> index a73554e..b515019 100644
> --- a/drivers/pci/controller/pcie-xilinx-nwl.c
> +++ b/drivers/pci/controller/pcie-xilinx-nwl.c
> @@ -126,7 +126,7 @@
>  #define E_ECAM_CR_ENABLE		BIT(0)
>  #define E_ECAM_SIZE_LOC			GENMASK(20, 16)
>  #define E_ECAM_SIZE_SHIFT		16
> -#define NWL_ECAM_VALUE_DEFAULT		12
> +#define NWL_ECAM_VALUE_DEFAULT		16
>  
>  #define CFG_DMA_REG_BAR			GENMASK(2, 0)
>  #define CFG_PCIE_CACHE			GENMASK(7, 0)
> -- 
> 1.8.3.1
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

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