linux-kernel - Re: [PATCH 5/5] pci: controller: dwc: qcom: Harcode PCIe config SID

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Date:   Wed, 16 Sep 2020 17:06:18 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     agross@...nel.org, bjorn.andersson@...aro.org, kishon@...com,
        vkoul@...nel.org, robh@...nel.org, svarbanov@...sol.com,
        bhelgaas@...gle.com, lorenzo.pieralisi@....com,
        linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, mgautam@...eaurora.org,
        devicetree@...r.kernel.org, Jonathan Marek <jonathan@...ek.ca>
Subject: Re: [PATCH 5/5] pci: controller: dwc: qcom: Harcode PCIe config SID

s/Harcode/Hardcode/ (in subject)

Also fix subject format as for 4/5.

On Wed, Sep 16, 2020 at 06:50:00PM +0530, Manivannan Sadhasivam wrote:
> Hardcode the PCIe config SID table value. This is needed to avoid random
> MHI failure observed during reboot on SM8250.
> 
> Signed-off-by: Jonathan Marek <jonathan@...ek.ca>
> [mani: stripped out unnecessary settings and ported for upstream]
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> ---
>  drivers/pci/controller/dwc/pcie-qcom.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
> index ca8ad354e09d..50748016ce96 100644
> --- a/drivers/pci/controller/dwc/pcie-qcom.c
> +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> @@ -57,6 +57,7 @@
>  #define PCIE20_PARF_SID_OFFSET			0x234
>  #define PCIE20_PARF_BDF_TRANSLATE_CFG		0x24C
>  #define PCIE20_PARF_DEVICE_TYPE			0x1000
> +#define PCIE20_PARF_BDF_TO_SID_TABLE_N		0x2000
>  
>  #define PCIE20_ELBI_SYS_CTRL			0x04
>  #define PCIE20_ELBI_SYS_CTRL_LT_ENABLE		BIT(0)
> @@ -1290,6 +1291,9 @@ static int qcom_pcie_host_init(struct pcie_port *pp)
>  	if (ret)
>  		goto err;
>  
> +	writel(0x0, pcie->parf + PCIE20_PARF_BDF_TO_SID_TABLE_N);
> +	writel(0x01000100, pcie->parf + PCIE20_PARF_BDF_TO_SID_TABLE_N + 0x054);
> +
>  	return 0;
>  err:
>  	qcom_ep_reset_assert(pcie);
> -- 
> 2.17.1
>