linux-kernel - Re: [PATCH v2] PCI: cadence: Enable Controller to respond to received PTM Requests

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Date:   Thu, 10 Mar 2022 13:14:05 +0100
From:   Christian Gmeiner <christian.gmeiner@...il.com>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Tom Joseph <tjoseph@...ence.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org
Subject: Re: [PATCH v2] PCI: cadence: Enable Controller to respond to received
 PTM Requests

Hi all

> This enables the Controller [RP] to automatically respond with
> Response/ResponseD messages if CDNS_PCIE_LM_TPM_CTRL_PTMRSEN
> and PCI_PTM_CTRL_ENABLE bits are both set.
>
> Signed-off-by: Christian Gmeiner <christian.gmeiner@...il.com>
> ---
>  drivers/pci/controller/cadence/pcie-cadence-host.c | 10 ++++++++++
>  drivers/pci/controller/cadence/pcie-cadence.h      |  4 ++++
>  2 files changed, 14 insertions(+)
>
> diff --git a/drivers/pci/controller/cadence/pcie-cadence-host.c b/drivers/pci/controller/cadence/pcie-cadence-host.c
> index fb96d37a135c..940c7dd701d6 100644
> --- a/drivers/pci/controller/cadence/pcie-cadence-host.c
> +++ b/drivers/pci/controller/cadence/pcie-cadence-host.c
> @@ -123,6 +123,14 @@ static int cdns_pcie_retrain(struct cdns_pcie *pcie)
>         return ret;
>  }
>
> +static void cdns_pcie_host_enable_ptm_response(struct cdns_pcie *pcie)
> +{
> +       u32 val;
> +
> +       val = cdns_pcie_readl(pcie, CDNS_PCIE_LM_PTM_CTRL);
> +       cdns_pcie_writel(pcie, CDNS_PCIE_LM_PTM_CTRL, val | CDNS_PCIE_LM_TPM_CTRL_PTMRSEN);
> +}
> +
>  static int cdns_pcie_host_start_link(struct cdns_pcie_rc *rc)
>  {
>         struct cdns_pcie *pcie = &rc->pcie;
> @@ -501,6 +509,8 @@ int cdns_pcie_host_setup(struct cdns_pcie_rc *rc)
>         if (rc->quirk_detect_quiet_flag)
>                 cdns_pcie_detect_quiet_min_delay_set(&rc->pcie);
>
> +       cdns_pcie_host_enable_ptm_response(pcie);
> +
>         ret = cdns_pcie_start_link(pcie);
>         if (ret) {
>                 dev_err(dev, "Failed to start link\n");
> diff --git a/drivers/pci/controller/cadence/pcie-cadence.h b/drivers/pci/controller/cadence/pcie-cadence.h
> index c8a27b6290ce..1ffa8fa77a8a 100644
> --- a/drivers/pci/controller/cadence/pcie-cadence.h
> +++ b/drivers/pci/controller/cadence/pcie-cadence.h
> @@ -116,6 +116,10 @@
>  #define LM_RC_BAR_CFG_APERTURE(bar, aperture)          \
>                                         (((aperture) - 2) << ((bar) * 8))
>
> +/* PTM Control Register */
> +#define CDNS_PCIE_LM_PTM_CTRL  (CDNS_PCIE_LM_BASE + 0x0da8)
> +#define CDNS_PCIE_LM_TPM_CTRL_PTMRSEN  BIT(17)
> +
>  /*
>   * Endpoint Function Registers (PCI configuration space for endpoint functions)
>   */
> --
> 2.35.1
>

This patch should be ready to land - or is anything missing?

-- 
greets
--
Christian Gmeiner, MSc

https://christian-gmeiner.info/privacypolicy