linux-kernel - [PATCH v2] PCI: dwc: Use {upper,lower}_32

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Date:   Wed, 27 Dec 2017 15:25:40 -0800
From:   Stephen Boyd <sboyd@...eaurora.org>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc:     Jingoo Han <jingoohan1@...il.com>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        linux-kernel@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-pci@...r.kernel.org
Subject: [PATCH v2] PCI: dwc: Use {upper,lower}_32_bits() macros for clarity

We have macros for getting the upper or lower 32 bits of a
number. Use them here to shave a couple lines off the code
and provide clarity.

Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
---

Changes from v1:
 * Update dw_msi_setup_msg() too
 * Reword commit text slightly

 drivers/pci/dwc/pcie-designware-host.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/pci/dwc/pcie-designware-host.c b/drivers/pci/dwc/pcie-designware-host.c
index 81e2157a7cfb..454b8d244071 100644
--- a/drivers/pci/dwc/pcie-designware-host.c
+++ b/drivers/pci/dwc/pcie-designware-host.c
@@ -89,10 +89,8 @@ void dw_pcie_msi_init(struct pcie_port *pp)
 	msi_target = virt_to_phys((void *)pp->msi_data);
 
 	/* program the msi_data */
-	dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_LO, 4,
-			    (u32)(msi_target & 0xffffffff));
-	dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_HI, 4,
-			    (u32)(msi_target >> 32 & 0xffffffff));
+	dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_LO, 4, lower_32_bits(msi_target));
+	dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_HI, 4, upper_32_bits(msi_target));
 }
 
 static void dw_pcie_msi_clear_irq(struct pcie_port *pp, int irq)
@@ -189,8 +187,8 @@ static void dw_msi_setup_msg(struct pcie_port *pp, unsigned int irq, u32 pos)
 	else
 		msi_target = virt_to_phys((void *)pp->msi_data);
 
-	msg.address_lo = (u32)(msi_target & 0xffffffff);
-	msg.address_hi = (u32)(msi_target >> 32 & 0xffffffff);
+	msg.address_lo = lower_32_bits(msi_target);
+	msg.address_hi = upper_32_bits(msi_target);
 
 	if (pp->ops->get_msi_data)
 		msg.data = pp->ops->get_msi_data(pp, pos);
-- 
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