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From: Heiner Kallweit <hkallweit1@gmail.com>
To: Frederick Lawler <fred@fredlawl.com>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Greg KH <gregkh@linuxfoundation.org>,
	Rajat Jain <rajatja@google.com>
Cc: "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>
Subject: [PATCH v2 1/3] PCI/ASPM: add L1 sub-state support to pci_disable_link_state
Date: Wed, 21 Aug 2019 20:17:05 +0200
Message-ID: <caa2c135-1fb3-f19e-a2e9-66edaf79b73e@gmail.com> (raw)
In-Reply-To: <b4b1518a-d0e8-9534-5211-115107e770e1@gmail.com>

Add support for disabling states L1.1 and L1.2 to
pci_disable_link_state. Allow separate control of
ASPM and PCI PM L1 sub-states.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
v2:
- allow separate control of ASPM and PCI PM L1 sub-states
---
 drivers/pci/pcie/aspm.c  | 11 ++++++++++-
 include/linux/pci-aspm.h | 10 +++++++---
 2 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index 464f8f926..1c1b9b7d6 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -1095,7 +1095,16 @@ static int __pci_disable_link_state(struct pci_dev *pdev, int state, bool sem)
 	if (state & PCIE_LINK_STATE_L0S)
 		link->aspm_disable |= ASPM_STATE_L0S;
 	if (state & PCIE_LINK_STATE_L1)
-		link->aspm_disable |= ASPM_STATE_L1;
+		/* sub-states require L1 */
+		link->aspm_disable |= ASPM_STATE_L1 | ASPM_STATE_L1SS;
+	if (state & PCIE_LINK_STATE_L1_1)
+		link->aspm_disable |= ASPM_STATE_L1_1;
+	if (state & PCIE_LINK_STATE_L1_2)
+		link->aspm_disable |= ASPM_STATE_L1_2;
+	if (state & PCIE_LINK_STATE_L1_1_PCIPM)
+		link->aspm_disable |= ASPM_STATE_L1_1_PCIPM;
+	if (state & PCIE_LINK_STATE_L1_2_PCIPM)
+		link->aspm_disable |= ASPM_STATE_L1_2_PCIPM;
 	pcie_config_aspm_link(link, policy_to_aspm_state(link));
 
 	if (state & PCIE_LINK_STATE_CLKPM) {
diff --git a/include/linux/pci-aspm.h b/include/linux/pci-aspm.h
index 67064145d..f635cbdff 100644
--- a/include/linux/pci-aspm.h
+++ b/include/linux/pci-aspm.h
@@ -19,9 +19,13 @@
 
 #include <linux/pci.h>
 
-#define PCIE_LINK_STATE_L0S	1
-#define PCIE_LINK_STATE_L1	2
-#define PCIE_LINK_STATE_CLKPM	4
+#define PCIE_LINK_STATE_L0S		BIT(0)
+#define PCIE_LINK_STATE_L1		BIT(1)
+#define PCIE_LINK_STATE_CLKPM		BIT(2)
+#define PCIE_LINK_STATE_L1_1		BIT(3)
+#define PCIE_LINK_STATE_L1_2		BIT(4)
+#define PCIE_LINK_STATE_L1_1_PCIPM	BIT(5)
+#define PCIE_LINK_STATE_L1_2_PCIPM	BIT(6)
 
 #ifdef CONFIG_PCIEASPM
 int pci_disable_link_state(struct pci_dev *pdev, int state);
-- 
2.23.0



  reply index

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-21 18:14 [PATCH v2 0/3] PCI/ASPM: add sysfs attributes for controlling ASPM Heiner Kallweit
2019-08-21 18:17 ` Heiner Kallweit [this message]
2019-08-21 18:17 ` [PATCH v2 2/3] PCI/ASPM: allow to re-enable Clock PM Heiner Kallweit
2019-08-21 18:18 ` [PATCH v2 3/3] PCI/ASPM: add sysfs attributes for controlling ASPM Heiner Kallweit
2019-08-22 13:05   ` Greg KH
2019-08-22 19:15     ` Heiner Kallweit
2019-08-22 19:46       ` Heiner Kallweit

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