[v2,9/9] PCI: dwc: Do not write to MSI control registers if the platform doesn't use it

Message ID 20190207110924.30716-10-kishon@ti.com
State Superseded
Headers show
Series
  • PCI: DWC/Keystone: MSI configuration cleanup
Related show

Commit Message

Kishon Vijay Abraham I Feb. 7, 2019, 11:09 a.m.
Platforms which populate msi_host_init, has it's own MSI controller
logic. Writing to MSI control registers on platforms which doesn't use
Designware's MSI controller logic might have side effects. To
be safe, do not write to MSI control registers if the platform uses
it's own MSI controller logic instead of Designware's MSI controller
logic.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>

---
 .../pci/controller/dwc/pcie-designware-host.c | 24 ++++++++++---------
 1 file changed, 13 insertions(+), 11 deletions(-)

-- 
2.17.1

Patch

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 9492b05e8ff0..d7184e1a7d92 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -647,17 +647,19 @@  void dw_pcie_setup_rc(struct pcie_port *pp)
 
 	dw_pcie_setup(pci);
 
-	num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
-
-	/* Initialize IRQ Status array */
-	for (ctrl = 0; ctrl < num_ctrls; ctrl++) {
-		dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_MASK +
-					(ctrl * MSI_REG_CTRL_BLOCK_SIZE),
-				    4, ~0);
-		dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE +
-					(ctrl * MSI_REG_CTRL_BLOCK_SIZE),
-				    4, ~0);
-		pp->irq_status[ctrl] = 0;
+	if (!pp->ops->msi_host_init) {
+		num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
+
+		/* Initialize IRQ Status array */
+		for (ctrl = 0; ctrl < num_ctrls; ctrl++) {
+			dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_MASK +
+					    (ctrl * MSI_REG_CTRL_BLOCK_SIZE),
+					    4, ~0);
+			dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE +
+					    (ctrl * MSI_REG_CTRL_BLOCK_SIZE),
+					    4, ~0);
+			pp->irq_status[ctrl] = 0;
+		}
 	}
 
 	/* Setup RC BARs */