linux-kernel - Re: [PATCH v2 2/2] PCI: qcom-ep: Add HDMA support for QCS9100 SoC

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Message-ID: <20240709162621.GA175973@bhelgaas>
Date: Tue, 9 Jul 2024 11:26:21 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Tengfei Fan <quic_tengfan@...cinc.com>
Cc: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, kernel@...cinc.com,
	linux-pci@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] PCI: qcom-ep: Add HDMA support for QCS9100 SoC

On Tue, Jul 09, 2024 at 10:53:44PM +0800, Tengfei Fan wrote:
> QCS9100 SoC supports the new Hyper DMA (HDMA) DMA Engine inside the DWC IP,
> so add support for it by passing the mapping format and the number of
> read/write channels count.
> 
> The PCIe EP controller used on this SoC is of version 1.34.0, so a separate
> config struct is introduced for the sake of enabling HDMA conditionally.

This patch doesn't add a new config struct.

> It should be noted that for the eDMA support (predecessor of HDMA), there
> are no mapping format and channels count specified. That is because eDMA
> supports auto detection of both parameters, whereas HDMA doesn't.
> 
> QCS9100 is drived from SA8775p. Currently, both the QCS9100 and SA8775p
> platform use non-SCMI resource. In the future, the SA8775p platform will
> move to use SCMI resources and it will have new sa8775p-related device
> tree. Consequently, introduce "qcom,qcs9100-pcie-ep" to the PCIe device
> match table.

This series doesn't add the new SCMI stuff you mention.  It sounds
like this should be deferred and added when you actually move to using
SCMI resources.

> Signed-off-by: Tengfei Fan <quic_tengfan@...cinc.com>
> ---
>  drivers/pci/controller/dwc/pcie-qcom-ep.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c
> index 236229f66c80..e2775f4ca7ee 100644
> --- a/drivers/pci/controller/dwc/pcie-qcom-ep.c
> +++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c
> @@ -904,6 +904,7 @@ static const struct qcom_pcie_ep_cfg cfg_1_34_0 = {
>  };
>  
>  static const struct of_device_id qcom_pcie_ep_match[] = {
> +	{ .compatible = "qcom,qcs9100-pcie-ep", .data = &cfg_1_34_0},
>  	{ .compatible = "qcom,sa8775p-pcie-ep", .data = &cfg_1_34_0},
>  	{ .compatible = "qcom,sdx55-pcie-ep", },
>  	{ .compatible = "qcom,sm8450-pcie-ep", },
> 
> -- 
> 2.25.1
>