From: Bjorn Helgaas <helgaas@kernel.org>
To: Christian Gmeiner <christian.gmeiner@gmail.com>
Cc: linux-kernel@vger.kernel.org, "Tom Joseph" <tjoseph@cadence.com>,
"Lorenzo Pieralisi" <lorenzo.pieralisi@arm.com>,
"Rob Herring" <robh@kernel.org>,
"Krzysztof Wilczyński" <kw@linux.com>,
"Bjorn Helgaas" <bhelgaas@google.com>,
linux-pci@vger.kernel.org
Subject: Re: [PATCH] PCI: cadence: respond to received PTM Requests
Date: Mon, 31 Jan 2022 16:05:18 -0600 [thread overview]
Message-ID: <20220131220518.GA515079@bhelgaas> (raw)
In-Reply-To: <20220131120841.118833-1-christian.gmeiner@gmail.com>
Update subject line to match previous conventions ("git log --oneline
drivers/pci/controller/cadence/pcie-cadence-host.c" to see).
On Mon, Jan 31, 2022 at 01:08:27PM +0100, Christian Gmeiner wrote:
> This enables the Controller [RP] to automatically respond
> with Response/ResponseD messages.
Update to imperative mood, e.g., "Enable Controller to ...":
https://chris.beams.io/posts/git-commit/
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/maintainer-tip.rst?id=v5.16#n134
> Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.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);
I assume this is some device-specific enable bit that is effectively
ANDed with PCI_PTM_CTRL_ENABLE in the Precision Time Measurement
Capability?
> +}
> +
> 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..9510ea513b8a 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)
> */
> --
> 2.34.1
>
next prev parent reply other threads:[~2022-01-31 22:05 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-31 12:08 [PATCH] PCI: cadence: respond to received PTM Requests Christian Gmeiner
2022-01-31 22:05 ` Bjorn Helgaas [this message]
2022-02-04 14:45 ` Christian Gmeiner
2022-02-18 10:56 ` Kishon Vijay Abraham I
2022-02-18 13:13 ` Christian Gmeiner
2022-02-18 13:20 ` Bjorn Helgaas
2022-02-18 13:42 ` Christian Gmeiner
2022-02-22 14:10 ` Kishon Vijay Abraham I
2022-04-29 10:56 ` Lorenzo Pieralisi
2022-04-29 19:28 ` Bjorn Helgaas
2022-05-05 14:43 ` Dominic Rath
2022-05-05 14:48 ` Christian Gmeiner
2022-05-11 12:37 ` Lorenzo Pieralisi
2022-05-12 6:00 ` Christian Gmeiner
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