[PATCH v4 1/5] PCI: dwc: Determine whether iMSI is used before calling .init

[Marek Vasut <marek.vasut+renesas@mailbox.org>]

The R-Car Gen4 PCIe controller integration configures MSI registers
in the controller driver .init callback, because those registers
have to be configured while PERST signal is asserted, and the PERST
signal is asserted across the controller driver .init callback.

The registers have to be configured differently in case the iMSI is
or is not used. Assign pp->use_imsi_rx before the controller driver
.init callback is called, so the controller driver .init callback
implementation can use the pp->use_imsi_rx value.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
---
Cc: "Krzysztof Wilczyński" <kwilczynski@kernel.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Conor Dooley <conor+dt@kernel.org>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Krzysztof Kozlowski <krzk+dt@kernel.org>
Cc: Lorenzo Pieralisi <lpieralisi@kernel.org>
Cc: Manivannan Sadhasivam <mani@kernel.org>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Rob Herring <robh@kernel.org>
Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Cc: devicetree@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-doc@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-pci@vger.kernel.org
Cc: linux-renesas-soc@vger.kernel.org
---
V3: New patch
V4: No change
---
 drivers/pci/controller/dwc/pcie-designware-host.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 06722259d2e37..f5a38e6fd8d79 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -587,6 +587,12 @@ int dw_pcie_host_init(struct dw_pcie_rp *pp)
 	if (ret)
 		return ret;
 
+	if (pci_msi_enabled()) {
+		pp->use_imsi_rx = !(pp->ops->msi_init ||
+				    of_property_present(np, "msi-parent") ||
+				    of_property_present(np, "msi-map"));
+	}
+
 	if (pp->ops->init) {
 		ret = pp->ops->init(pp);
 		if (ret)
@@ -594,10 +600,6 @@ int dw_pcie_host_init(struct dw_pcie_rp *pp)
 	}
 
 	if (pci_msi_enabled()) {
-		pp->use_imsi_rx = !(pp->ops->msi_init ||
-				     of_property_present(np, "msi-parent") ||
-				     of_property_present(np, "msi-map"));
-
 		/*
 		 * For the use_imsi_rx case the default assignment is handled
 		 * in the dw_pcie_msi_host_init().
-- 
2.53.0