openwrt/target/linux/layerscape/patches-5.4/812-pcie-0002-PCI-dwc-Use-interrupt-disabling-instead-of-masking.patch

From c89d85a39df353290ea7af84a32d5ca692a3c27a Mon Sep 17 00:00:00 2001
From: Fugang Duan <fugang.duan@nxp.com>
Date: Sat, 2 Nov 2019 15:51:40 +0800
Subject: [PATCH] PCI: dwc: Use interrupt disabling instead of masking

commit 830920e065e9("PCI: dwc: Use interrupt masking instead
of disabling") break i.MX platform PCIe suspend/resume when
MSI enabled.

Revert the commit to keep orinigal method that using interrupt
disabling instead of masking.

Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
---
 drivers/pci/controller/dwc/pcie-designware-host.c | 19 +++++++------------
 1 file changed, 7 insertions(+), 12 deletions(-)

--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -157,8 +157,8 @@ static void dw_pci_bottom_mask(struct ir
 	bit = d->hwirq % MAX_MSI_IRQS_PER_CTRL;
 
 	pp->irq_mask[ctrl] |= BIT(bit);
-	dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_MASK + res, 4,
-			    pp->irq_mask[ctrl]);
+	dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4,
+			    ~pp->irq_mask[ctrl]);
 
 	raw_spin_unlock_irqrestore(&pp->lock, flags);
 }
@@ -176,8 +176,8 @@ static void dw_pci_bottom_unmask(struct
 	bit = d->hwirq % MAX_MSI_IRQS_PER_CTRL;
 
 	pp->irq_mask[ctrl] &= ~BIT(bit);
-	dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_MASK + res, 4,
-			    pp->irq_mask[ctrl]);
+	dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4,
+			    ~pp->irq_mask[ctrl]);
 
 	raw_spin_unlock_irqrestore(&pp->lock, flags);
 }
@@ -659,15 +659,10 @@ void dw_pcie_setup_rc(struct pcie_port *
 		num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
 
 		/* Initialize IRQ Status array */
-		for (ctrl = 0; ctrl < num_ctrls; ctrl++) {
-			pp->irq_mask[ctrl] = ~0;
-			dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_MASK +
+		for (ctrl = 0; ctrl < num_ctrls; ctrl++)
+			dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE +
 					    (ctrl * MSI_REG_CTRL_BLOCK_SIZE),
-					    4, pp->irq_mask[ctrl]);
-			dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE +
-					    (ctrl * MSI_REG_CTRL_BLOCK_SIZE),
-					    4, ~0);
-		}
+					    4, &pp->irq_mask[ctrl]);
 	}
 
 	/* Setup RC BARs */