mac80211: add pcie apsm backport changes

Required for newer versions of mt76

Signed-off-by: Felix Fietkau <[email protected]>

package/kernel/mac80211/patches/build/100-backports-pci-Include-linux-pci-aspm.h.patch

@@ -0,0 +1,24 @@
+From: Hauke Mehrtens <[email protected]>
+Date: Fri, 27 Sep 2019 23:12:08 +0200
+Subject: [PATCH] backports: pci: Include linux/pci-aspm.h
+
+In upstream commit 7ce2e76a0420 linux/pci-aspm.h was removed and the
+content included into pci.h. Add an include to have the functions
+defined in linux/pci-aspm.h available when linux/pci.h is included.
+
+Signed-off-by: Hauke Mehrtens <[email protected]>
+---
+
+--- a/backport-include/linux/pci.h
++++ b/backport-include/linux/pci.h
+@@ -3,6 +3,10 @@
+ #include_next <linux/pci.h>
+ #include <linux/version.h>
+ 
++#if LINUX_VERSION_IS_LESS(5,4,0)
++#include <linux/pci-aspm.h>
++#endif
++
+ #ifndef module_pci_driver
+ /**
+  * module_pci_driver() - Helper macro for registering a PCI driver

package/kernel/mac80211/patches/build/101-backport-add-pci_disable_link_state-wrapper-with-ret.patch

@@ -0,0 +1,43 @@
+From: Felix Fietkau <[email protected]>
+Date: Mon, 28 Oct 2019 15:20:40 +0100
+Subject: [PATCH] backport: add pci_disable_link_state wrapper with return code
+
+The signature of pci_disable_link_state was changed to indicate if the state
+was successfully disabled. Since the old version did not have this, add a
+wrapper which checks the pcie register to determine the return code
+
+Signed-off-by: Felix Fietkau <[email protected]>
+---
+
+--- a/backport-include/linux/pci.h
++++ b/backport-include/linux/pci.h
+@@ -236,4 +236,29 @@ static inline struct pci_dev *pcie_find_
+ 	(PCI_IRQ_LEGACY | PCI_IRQ_MSI | PCI_IRQ_MSIX)
+ #endif
+ 
++#if LINUX_VERSION_IS_LESS(5,3,0)
++
++static inline int
++LINUX_BACKPORT(pci_disable_link_state)(struct pci_dev *pdev, int state)
++{
++	u16 aspmc;
++
++	pci_disable_link_state(pdev, state);
++
++	pcie_capability_read_word(pdev, PCI_EXP_LNKCTL, &aspmc);
++	if ((state & PCIE_LINK_STATE_L0S) &&
++	    (aspmc & PCI_EXP_LNKCTL_ASPM_L0S))
++		return -EPERM;
++
++	if ((state & PCIE_LINK_STATE_L1) &&
++	    (aspmc & PCI_EXP_LNKCTL_ASPM_L1))
++		return -EPERM;
++
++	return 0;
++}
++
++#define pci_disable_link_state LINUX_BACKPORT(pci_disable_link_state)
++
++#endif
++
+ #endif /* _BACKPORT_LINUX_PCI_H */