Merge tag 'pci-v6.2-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci

Pull PCI fixes from Bjorn Helgaas:

 - Move to a shared PCI git tree (Bjorn Helgaas)

 - Add Krzysztof Wilczyński as another PCI maintainer (Lorenzo
   Pieralisi)

 - Revert a couple ASPM patches to fix suspend/resume regressions (Bjorn
   Helgaas)

* tag 'pci-v6.2-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci:
  Revert "PCI/ASPM: Refactor L1 PM Substates Control Register programming"
  Revert "PCI/ASPM: Save L1 PM Substates Capability for suspend/resume"
  MAINTAINERS: Promote Krzysztof to PCI controller maintainer
  MAINTAINERS: Move to shared PCI tree

4 files changed, 40 insertions, 94 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index fb1471cb5ed3..513045878fe7 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -16120,7 +16120,7 @@ F:	drivers/pci/controller/pci-v3-semi.c
 
 PCI ENDPOINT SUBSYSTEM
 M:	Lorenzo Pieralisi <lpieralisi@kernel.org>
-R:	Krzysztof Wilczyński <kw@linux.com>
+M:	Krzysztof Wilczyński <kw@linux.com>
 R:	Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
 R:	Kishon Vijay Abraham I <kishon@kernel.org>
 L:	linux-pci@vger.kernel.org
@@ -16128,7 +16128,7 @@ S:	Supported
 Q:	https://patchwork.kernel.org/project/linux-pci/list/
 B:	https://bugzilla.kernel.org
 C:	irc://irc.oftc.net/linux-pci
-T:	git git://git.kernel.org/pub/scm/linux/kernel/git/lpieralisi/pci.git
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git
 F:	Documentation/PCI/endpoint/*
 F:	Documentation/misc-devices/pci-endpoint-test.rst
 F:	drivers/misc/pci_endpoint_test.c
@@ -16163,7 +16163,7 @@ S:	Supported
 Q:	https://patchwork.kernel.org/project/linux-pci/list/
 B:	https://bugzilla.kernel.org
 C:	irc://irc.oftc.net/linux-pci
-T:	git git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git
 F:	Documentation/driver-api/pci/p2pdma.rst
 F:	drivers/pci/p2pdma.c
 F:	include/linux/pci-p2pdma.h
@@ -16185,14 +16185,14 @@ F:	drivers/pci/controller/pci-xgene-msi.c
 
 PCI NATIVE HOST BRIDGE AND ENDPOINT DRIVERS
 M:	Lorenzo Pieralisi <lpieralisi@kernel.org>
+M:	Krzysztof Wilczyński <kw@linux.com>
 R:	Rob Herring <robh@kernel.org>
-R:	Krzysztof Wilczyński <kw@linux.com>
 L:	linux-pci@vger.kernel.org
 S:	Supported
 Q:	https://patchwork.kernel.org/project/linux-pci/list/
 B:	https://bugzilla.kernel.org
 C:	irc://irc.oftc.net/linux-pci
-T:	git git://git.kernel.org/pub/scm/linux/kernel/git/lpieralisi/pci.git
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git
 F:	Documentation/devicetree/bindings/pci/
 F:	drivers/pci/controller/
 F:	drivers/pci/pci-bridge-emul.c
@@ -16205,7 +16205,7 @@ S:	Supported
 Q:	https://patchwork.kernel.org/project/linux-pci/list/
 B:	https://bugzilla.kernel.org
 C:	irc://irc.oftc.net/linux-pci
-T:	git git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git
 F:	Documentation/PCI/
 F:	Documentation/devicetree/bindings/pci/
 F:	arch/x86/kernel/early-quirks.c
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index fba95486caaf..5641786bd020 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1665,7 +1665,6 @@ int pci_save_state(struct pci_dev *dev)
 		return i;
 
 	pci_save_ltr_state(dev);
-	pci_save_aspm_l1ss_state(dev);
 	pci_save_dpc_state(dev);
 	pci_save_aer_state(dev);
 	pci_save_ptm_state(dev);
@@ -1772,7 +1771,6 @@ void pci_restore_state(struct pci_dev *dev)
 	 * LTR itself (in the PCIe capability).
 	 */
 	pci_restore_ltr_state(dev);
-	pci_restore_aspm_l1ss_state(dev);
 
 	pci_restore_pcie_state(dev);
 	pci_restore_pasid_state(dev);
@@ -3465,11 +3463,6 @@ void pci_allocate_cap_save_buffers(struct pci_dev *dev)
 	if (error)
 		pci_err(dev, "unable to allocate suspend buffer for LTR\n");
 
-	error = pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_L1SS,
-					    2 * sizeof(u32));
-	if (error)
-		pci_err(dev, "unable to allocate suspend buffer for ASPM-L1SS\n");
-
 	pci_allocate_vc_save_buffers(dev);
 }
 
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 9ed3b5550043..9049d07d3aae 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -566,14 +566,10 @@ bool pcie_wait_for_link(struct pci_dev *pdev, bool active);
 void pcie_aspm_init_link_state(struct pci_dev *pdev);
 void pcie_aspm_exit_link_state(struct pci_dev *pdev);
 void pcie_aspm_powersave_config_link(struct pci_dev *pdev);
-void pci_save_aspm_l1ss_state(struct pci_dev *dev);
-void pci_restore_aspm_l1ss_state(struct pci_dev *dev);
 #else
 static inline void pcie_aspm_init_link_state(struct pci_dev *pdev) { }
 static inline void pcie_aspm_exit_link_state(struct pci_dev *pdev) { }
 static inline void pcie_aspm_powersave_config_link(struct pci_dev *pdev) { }
-static inline void pci_save_aspm_l1ss_state(struct pci_dev *dev) { }
-static inline void pci_restore_aspm_l1ss_state(struct pci_dev *dev) { }
 #endif
 
 #ifdef CONFIG_PCIE_ECRC
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index 53a1fa306e1e..4b4184563a92 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -470,31 +470,6 @@ static void pci_clear_and_set_dword(struct pci_dev *pdev, int pos,
 	pci_write_config_dword(pdev, pos, val);
 }
 
-static void aspm_program_l1ss(struct pci_dev *dev, u32 ctl1, u32 ctl2)
-{
-	u16 l1ss = dev->l1ss;
-	u32 l1_2_enable;
-
-	/*
-	 * Per PCIe r6.0, sec 5.5.4, T_POWER_ON in PCI_L1SS_CTL2 must be
-	 * programmed prior to setting the L1.2 enable bits in PCI_L1SS_CTL1.
-	 */
-	pci_write_config_dword(dev, l1ss + PCI_L1SS_CTL2, ctl2);
-
-	/*
-	 * In addition, Common_Mode_Restore_Time and LTR_L1.2_THRESHOLD in
-	 * PCI_L1SS_CTL1 must be programmed *before* setting the L1.2
-	 * enable bits, even though they're all in PCI_L1SS_CTL1.
-	 */
-	l1_2_enable = ctl1 & PCI_L1SS_CTL1_L1_2_MASK;
-	ctl1 &= ~PCI_L1SS_CTL1_L1_2_MASK;
-
-	pci_write_config_dword(dev, l1ss + PCI_L1SS_CTL1, ctl1);
-	if (l1_2_enable)
-		pci_write_config_dword(dev, l1ss + PCI_L1SS_CTL1,
-				       ctl1 | l1_2_enable);
-}
-
 /* Calculate L1.2 PM substate timing parameters */
 static void aspm_calc_l1ss_info(struct pcie_link_state *link,
 				u32 parent_l1ss_cap, u32 child_l1ss_cap)
@@ -504,6 +479,7 @@ static void aspm_calc_l1ss_info(struct pcie_link_state *link,
 	u32 t_common_mode, t_power_on, l1_2_threshold, scale, value;
 	u32 ctl1 = 0, ctl2 = 0;
 	u32 pctl1, pctl2, cctl1, cctl2;
+	u32 pl1_2_enables, cl1_2_enables;
 
 	if (!(link->aspm_support & ASPM_STATE_L1_2_MASK))
 		return;
@@ -552,21 +528,39 @@ static void aspm_calc_l1ss_info(struct pcie_link_state *link,
 	    ctl2 == pctl2 && ctl2 == cctl2)
 		return;
 
-	pctl1 &= ~(PCI_L1SS_CTL1_CM_RESTORE_TIME |
-		   PCI_L1SS_CTL1_LTR_L12_TH_VALUE |
-		   PCI_L1SS_CTL1_LTR_L12_TH_SCALE);
-	pctl1 |= (ctl1 & (PCI_L1SS_CTL1_CM_RESTORE_TIME |
-			  PCI_L1SS_CTL1_LTR_L12_TH_VALUE |
-			  PCI_L1SS_CTL1_LTR_L12_TH_SCALE));
-	aspm_program_l1ss(parent, pctl1, ctl2);
-
-	cctl1 &= ~(PCI_L1SS_CTL1_CM_RESTORE_TIME |
-		   PCI_L1SS_CTL1_LTR_L12_TH_VALUE |
-		   PCI_L1SS_CTL1_LTR_L12_TH_SCALE);
-	cctl1 |= (ctl1 & (PCI_L1SS_CTL1_CM_RESTORE_TIME |
-			  PCI_L1SS_CTL1_LTR_L12_TH_VALUE |
-			  PCI_L1SS_CTL1_LTR_L12_TH_SCALE));
-	aspm_program_l1ss(child, cctl1, ctl2);
+	/* Disable L1.2 while updating.  See PCIe r5.0, sec 5.5.4, 7.8.3.3 */
+	pl1_2_enables = pctl1 & PCI_L1SS_CTL1_L1_2_MASK;
+	cl1_2_enables = cctl1 & PCI_L1SS_CTL1_L1_2_MASK;
+
+	if (pl1_2_enables || cl1_2_enables) {
+		pci_clear_and_set_dword(child, child->l1ss + PCI_L1SS_CTL1,
+					PCI_L1SS_CTL1_L1_2_MASK, 0);
+		pci_clear_and_set_dword(parent, parent->l1ss + PCI_L1SS_CTL1,
+					PCI_L1SS_CTL1_L1_2_MASK, 0);
+	}
+
+	/* Program T_POWER_ON times in both ports */
+	pci_write_config_dword(parent, parent->l1ss + PCI_L1SS_CTL2, ctl2);
+	pci_write_config_dword(child, child->l1ss + PCI_L1SS_CTL2, ctl2);
+
+	/* Program Common_Mode_Restore_Time in upstream device */
+	pci_clear_and_set_dword(parent, parent->l1ss + PCI_L1SS_CTL1,
+				PCI_L1SS_CTL1_CM_RESTORE_TIME, ctl1);
+
+	/* Program LTR_L1.2_THRESHOLD time in both ports */
+	pci_clear_and_set_dword(parent,	parent->l1ss + PCI_L1SS_CTL1,
+				PCI_L1SS_CTL1_LTR_L12_TH_VALUE |
+				PCI_L1SS_CTL1_LTR_L12_TH_SCALE, ctl1);
+	pci_clear_and_set_dword(child, child->l1ss + PCI_L1SS_CTL1,
+				PCI_L1SS_CTL1_LTR_L12_TH_VALUE |
+				PCI_L1SS_CTL1_LTR_L12_TH_SCALE, ctl1);
+
+	if (pl1_2_enables || cl1_2_enables) {
+		pci_clear_and_set_dword(parent, parent->l1ss + PCI_L1SS_CTL1, 0,
+					pl1_2_enables);
+		pci_clear_and_set_dword(child, child->l1ss + PCI_L1SS_CTL1, 0,
+					cl1_2_enables);
+	}
 }
 
 static void aspm_l1ss_init(struct pcie_link_state *link)
@@ -757,43 +751,6 @@ static void pcie_config_aspm_l1ss(struct pcie_link_state *link, u32 state)
 				PCI_L1SS_CTL1_L1SS_MASK, val);
 }
 
-void pci_save_aspm_l1ss_state(struct pci_dev *dev)
-{
-	struct pci_cap_saved_state *save_state;
-	u16 l1ss = dev->l1ss;
-	u32 *cap;
-
-	if (!l1ss)
-		return;
-
-	save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS);
-	if (!save_state)
-		return;
-
-	cap = (u32 *)&save_state->cap.data[0];
-	pci_read_config_dword(dev, l1ss + PCI_L1SS_CTL2, cap++);
-	pci_read_config_dword(dev, l1ss + PCI_L1SS_CTL1, cap++);
-}
-
-void pci_restore_aspm_l1ss_state(struct pci_dev *dev)
-{
-	struct pci_cap_saved_state *save_state;
-	u32 *cap, ctl1, ctl2;
-	u16 l1ss = dev->l1ss;
-
-	if (!l1ss)
-		return;
-
-	save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS);
-	if (!save_state)
-		return;
-
-	cap = (u32 *)&save_state->cap.data[0];
-	ctl2 = *cap++;
-	ctl1 = *cap;
-	aspm_program_l1ss(dev, ctl1, ctl2);
-}
-
 static void pcie_config_aspm_dev(struct pci_dev *pdev, u32 val)
 {
 	pcie_capability_clear_and_set_word(pdev, PCI_EXP_LNKCTL,