From: Jian-Hong Pan <jhp@endlessos.org>
To: "Bjorn Helgaas" <helgaas@kernel.org>,
"Johan Hovold" <johan@kernel.org>,
"Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>,
"David Box" <david.e.box@linux.intel.com>
Cc: Mika Westerberg <mika.westerberg@linux.intel.com>,
Nirmal Patel <nirmal.patel@linux.intel.com>,
Jonathan Derrick <jonathan.derrick@linux.dev>,
linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
linux@endlessos.org, Jian-Hong Pan <jhp@endlessos.org>
Subject: [PATCH v3 3/3] PCI/ASPM: Fix L1SS parameters & only enable supported features when enable link state
Date: Wed, 7 Feb 2024 19:18:55 +0800 [thread overview]
Message-ID: <20240207111854.576402-2-jhp@endlessos.org> (raw)
The original __pci_enable_link_state() configs the links directly without:
* Check the L1 substates features which are supported, or not
* Calculate & program related parameters for L1.2, such as T_POWER_ON,
Common_Mode_Restore_Time, and LTR_L1.2_THRESHOLD
This leads some supported L1 PM substates of the link between VMD remapped
PCIe Root Port and NVMe get wrong configs when a caller tries to enabled
them.
Here is a failed example on ASUS B1400CEAE with enabled VMD:
Capabilities: [900 v1] L1 PM Substates
L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1- ASPM_L1.2+ ASPM_L1.1- L1_PM_Substates+
PortCommonModeRestoreTime=32us PortTPowerOnTime=10us
L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2+ ASPM_L1.1-
T_CommonMode=0us LTR1.2_Threshold=0ns
L1SubCtl2: T_PwrOn=10us
This patch initializes the link's L1 PM substates to get the supported
features and programs relating paramters, if some of them are going to be
enabled in __pci_enable_link_state(). Then, enables the L1 PM substates if
the caller intends to enable them and they are supported.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=218394
Signed-off-by: Jian-Hong Pan <jhp@endlessos.org>
---
v2:
- Prepare the PCIe LTR parameters before enable L1 Substates
v3:
- Only enable supported features for the L1 Substates part
drivers/pci/pcie/aspm.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index a39d2ee744cb..c866971cae70 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -1389,14 +1389,16 @@ static int __pci_enable_link_state(struct pci_dev *pdev, int state, bool locked)
link->aspm_default |= ASPM_STATE_L0S;
if (state & PCIE_LINK_STATE_L1)
link->aspm_default |= ASPM_STATE_L1;
- /* L1 PM substates require L1 */
- if (state & PCIE_LINK_STATE_L1_1)
+ if (state & ASPM_STATE_L1_2_MASK)
+ aspm_l1ss_init(link);
+ /* L1 PM substates require L1 and should be in supported list */
+ if (state & link->aspm_support & PCIE_LINK_STATE_L1_1)
link->aspm_default |= ASPM_STATE_L1_1 | ASPM_STATE_L1;
- if (state & PCIE_LINK_STATE_L1_2)
+ if (state & link->aspm_support & PCIE_LINK_STATE_L1_2)
link->aspm_default |= ASPM_STATE_L1_2 | ASPM_STATE_L1;
- if (state & PCIE_LINK_STATE_L1_1_PCIPM)
+ if (state & link->aspm_support & PCIE_LINK_STATE_L1_1_PCIPM)
link->aspm_default |= ASPM_STATE_L1_1_PCIPM | ASPM_STATE_L1;
- if (state & PCIE_LINK_STATE_L1_2_PCIPM)
+ if (state & link->aspm_support & PCIE_LINK_STATE_L1_2_PCIPM)
link->aspm_default |= ASPM_STATE_L1_2_PCIPM | ASPM_STATE_L1;
pcie_config_aspm_link(link, policy_to_aspm_state(link));
--
2.43.0
next reply other threads:[~2024-02-07 11:25 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-07 11:18 Jian-Hong Pan [this message]
2024-02-07 12:54 ` [PATCH v3 3/3] PCI/ASPM: Fix L1SS parameters & only enable supported features when enable link state Ilpo Järvinen
2024-02-07 16:02 ` David E. Box
2024-02-16 3:13 ` Jian-Hong Pan
2024-02-07 17:19 ` Kuppuswamy Sathyanarayanan
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20240207111854.576402-2-jhp@endlessos.org \
--to=jhp@endlessos.org \
--cc=david.e.box@linux.intel.com \
--cc=helgaas@kernel.org \
--cc=ilpo.jarvinen@linux.intel.com \
--cc=johan@kernel.org \
--cc=jonathan.derrick@linux.dev \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pci@vger.kernel.org \
--cc=linux@endlessos.org \
--cc=mika.westerberg@linux.intel.com \
--cc=nirmal.patel@linux.intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).