linux-kernel - Re: [PATCH] PCI: dwc: Support 16-lane operation

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Message-ID: <20250926210345.GA2267761@bhelgaas>
Date: Fri, 26 Sep 2025 16:03:45 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Konrad Dybcio <konradybcio@...nel.org>
Cc: Jingoo Han <jingoohan1@...il.com>,
	Manivannan Sadhasivam <mani@...nel.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kwilczynski@...nel.org>,
	Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: Re: [PATCH] PCI: dwc: Support 16-lane operation

On Fri, Sep 26, 2025 at 02:22:45PM +0200, Konrad Dybcio wrote:
> From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
> 
> Some hosts support 16 lanes of PCIe. Make num-lanes accept that number.
> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>

Applied to pci/controller/dwc, hoping for v6.18.

> ---
>  drivers/pci/controller/dwc/pcie-designware.c | 3 +++
>  drivers/pci/controller/dwc/pcie-designware.h | 1 +
>  2 files changed, 4 insertions(+)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
> index fce15582c22a93167c6f03c0e3ae74f3d0e68b1a..1d7c2b27005f757d272fe78c4df48daa6628f0a3 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.c
> +++ b/drivers/pci/controller/dwc/pcie-designware.c
> @@ -774,6 +774,9 @@ static void dw_pcie_link_set_max_link_width(struct dw_pcie *pci, u32 num_lanes)
>  	case 8:
>  		plc |= PORT_LINK_MODE_8_LANES;
>  		break;
> +	case 16:
> +		plc |= PORT_LINK_MODE_16_LANES;
> +		break;
>  	default:
>  		dev_err(pci->dev, "num-lanes %u: invalid value\n", num_lanes);
>  		return;
> diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
> index a333ab0b0bbd8c2fc0ee32a5619696178c6b7aa2..ae11a78cc5b9a4202794cfa515e1ee496a4f47c2 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.h
> +++ b/drivers/pci/controller/dwc/pcie-designware.h
> @@ -90,6 +90,7 @@
>  #define PORT_LINK_MODE_2_LANES		PORT_LINK_MODE(0x3)
>  #define PORT_LINK_MODE_4_LANES		PORT_LINK_MODE(0x7)
>  #define PORT_LINK_MODE_8_LANES		PORT_LINK_MODE(0xf)
> +#define PORT_LINK_MODE_16_LANES		PORT_LINK_MODE(0x1f)
>  
>  #define PCIE_PORT_LANE_SKEW		0x714
>  #define PORT_LANE_SKEW_INSERT_MASK	GENMASK(23, 0)
> 
> ---
> base-commit: 8e2755d7779a95dd61d8997ebce33ff8b1efd3fb
> change-id: 20250926-topic-pcie_16ln-8b505b7909f4
> 
> Best regards,
> -- 
> Konrad Dybcio <konrad.dybcio@....qualcomm.com>
>