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PCI: aspm_ext: Supoprt to check l1ss state

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Change-Id: I585d01908751cefb66935951d42cd854299469fa
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
This commit is contained in:
Jon Lin
2024-04-01 21:19:21 +08:00
committed by Tao Huang
parent e136756b81
commit daf69def71
2 changed files with 21 additions and 0 deletions
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19
drivers/pci/pcie/aspm_ext.c
View File

@@ -11,6 +11,10 @@
#include <linux/aspm_ext.h>
#include <linux/errno.h>
#define PCIE_RAS_DES_CAP_SD_STATUS_PM 0xB8
#define PCIE_RAS_DES_CAP_LISS_SHIFT 13
#define PCIE_RAS_DES_CAP_LISS_MASK (0x7 << PCIE_RAS_DES_CAP_LISS_SHIFT)
#define PCIE_RAS_DES_CAP_LISS (0x5 << PCIE_RAS_DES_CAP_LISS_SHIFT)
static u32 rockchip_pcie_pcie_access_cap(struct pci_dev *pdev, int cap, uint offset,
bool is_ext, bool is_write, u32 writeval)
@@ -343,4 +347,19 @@ void pcie_aspm_ext_l1ss_enable(struct pci_dev *child, struct pci_dev *parent, bo
}
EXPORT_SYMBOL(pcie_aspm_ext_l1ss_enable);
bool pcie_aspm_ext_is_in_l1sub_state(struct pci_dev *pdev)
{
u32 val;
val = rockchip_pcie_pcie_access_cap(pdev, PCI_EXT_CAP_ID_VNDR,
PCIE_RAS_DES_CAP_SD_STATUS_PM,
true, false, 0);
if ((val & PCIE_RAS_DES_CAP_LISS_MASK) == PCIE_RAS_DES_CAP_LISS)
return true;
return false;
}
EXPORT_SYMBOL(pcie_aspm_ext_is_in_l1sub_state);
MODULE_LICENSE("GPL");

2
include/linux/aspm_ext.h
View File

@@ -8,9 +8,11 @@
#if IS_REACHABLE(CONFIG_PCIEASPM_EXT)
bool pcie_aspm_ext_is_rc_ep_l1ss_capable(struct pci_dev *child, struct pci_dev *parent);
void pcie_aspm_ext_l1ss_enable(struct pci_dev *child, struct pci_dev *parent, bool enable);
bool pcie_aspm_ext_is_in_l1sub_state(struct pci_dev *pdev);
#else
static inline bool pcie_aspm_ext_is_rc_ep_l1ss_capable(struct pci_dev *child, struct pci_dev *parent) { return false; }
static inline void pcie_aspm_ext_l1ss_enable(struct pci_dev *child, struct pci_dev *parent, bool enable) {}
static inline bool pcie_aspm_ext_is_in_l1sub_state(struct pci_dev *pdev) { return false; }
#endif
#endif