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[v7,2/3] PCI: xilinx: Don't enable config completion interrupts

Message ID 20170815191117.19882-3-paul.burton@imgtec.com (mailing list archive)
State New, archived
Delegated to: Bjorn Helgaas
Headers show

Commit Message

Paul Burton Aug. 15, 2017, 7:11 p.m. UTC 
The Xilinx AXI bridge for PCI Express device provides interrupts
indicating the completion of config space accesses. We have previously
enabled/unmasked them but do nothing with them besides acknowledge them.

Leave the interrupts masked in order to avoid servicing a large number
of pointless interrupts during boot.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: Bharat Kumar Gogada <bharatku@xilinx.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Michal Simek <michal.simek@xilinx.com>
Cc: Ravikiran Gummaluri <rgummal@xilinx.com>
Cc: linux-pci@vger.kernel.org
---

Changes in v7: None
Changes in v6: None
Changes in v5: None
Changes in v4: None
Changes in v3: None
Changes in v2: None

 drivers/pci/host/pcie-xilinx.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/pci/host/pcie-xilinx.c b/drivers/pci/host/pcie-xilinx.c
index a7880bed56fc..f30d03309c7f 100644
--- a/drivers/pci/host/pcie-xilinx.c
+++ b/drivers/pci/host/pcie-xilinx.c
@@ -60,6 +60,7 @@ 
 #define XILINX_PCIE_INTR_MST_SLVERR	BIT(27)
 #define XILINX_PCIE_INTR_MST_ERRP	BIT(28)
 #define XILINX_PCIE_IMR_ALL_MASK	0x1FF30FED
+#define XILINX_PCIE_IMR_ENABLE_MASK	0x1FF30F0D
 #define XILINX_PCIE_IDR_ALL_MASK	0xFFFFFFFF
 
 /* Root Port Error FIFO Read Register definitions */
@@ -554,8 +555,8 @@  static void xilinx_pcie_init_port(struct xilinx_pcie_port *port)
 			 XILINX_PCIE_IMR_ALL_MASK,
 		   XILINX_PCIE_REG_IDR);
 
-	/* Enable all interrupts */
-	pcie_write(port, XILINX_PCIE_IMR_ALL_MASK, XILINX_PCIE_REG_IMR);
+	/* Enable all interrupts we handle */
+	pcie_write(port, XILINX_PCIE_IMR_ENABLE_MASK, XILINX_PCIE_REG_IMR);
 
 	/* Enable the Bridge enable bit */
 	pcie_write(port, pcie_read(port, XILINX_PCIE_REG_RPSC) |