linux-kernel - [PATCH 1/7] PCI: cadence: Use FIELD

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Message-Id: <20231018113254.17616-2-ilpo.jarvinen@linux.intel.com>
Date:   Wed, 18 Oct 2023 14:32:48 +0300
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Tom Joseph <tjoseph@...ence.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        linux-kernel@...r.kernel.org
Cc:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [PATCH 1/7] PCI: cadence: Use FIELD_GET()

Convert open-coded variants of PCI field access into FIELD_GET() to
make the code easier to understand.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
---
 drivers/pci/controller/cadence/pcie-cadence-ep.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/controller/cadence/pcie-cadence-ep.c b/drivers/pci/controller/cadence/pcie-cadence-ep.c
index b8b655d4047e..3142feb8ac19 100644
--- a/drivers/pci/controller/cadence/pcie-cadence-ep.c
+++ b/drivers/pci/controller/cadence/pcie-cadence-ep.c
@@ -3,6 +3,7 @@
 // Cadence PCIe endpoint controller driver.
 // Author: Cyrille Pitchen <cyrille.pitchen@...e-electrons.com>
 
+#include <linux/bitfield.h>
 #include <linux/delay.h>
 #include <linux/kernel.h>
 #include <linux/of.h>
@@ -262,7 +263,7 @@ static int cdns_pcie_ep_get_msi(struct pci_epc *epc, u8 fn, u8 vfn)
 	 * Get the Multiple Message Enable bitfield from the Message Control
 	 * register.
 	 */
-	mme = (flags & PCI_MSI_FLAGS_QSIZE) >> 4;
+	mme = FIELD_GET(PCI_MSI_FLAGS_QSIZE, flags);
 
 	return mme;
 }
@@ -394,7 +395,7 @@ static int cdns_pcie_ep_send_msi_irq(struct cdns_pcie_ep *ep, u8 fn, u8 vfn,
 		return -EINVAL;
 
 	/* Get the number of enabled MSIs */
-	mme = (flags & PCI_MSI_FLAGS_QSIZE) >> 4;
+	mme = FIELD_GET(PCI_MSI_FLAGS_QSIZE, flags);
 	msi_count = 1 << mme;
 	if (!interrupt_num || interrupt_num > msi_count)
 		return -EINVAL;
@@ -449,7 +450,7 @@ static int cdns_pcie_ep_map_msi_irq(struct pci_epc *epc, u8 fn, u8 vfn,
 		return -EINVAL;
 
 	/* Get the number of enabled MSIs */
-	mme = (flags & PCI_MSI_FLAGS_QSIZE) >> 4;
+	mme = FIELD_GET(PCI_MSI_FLAGS_QSIZE, flags);
 	msi_count = 1 << mme;
 	if (!interrupt_num || interrupt_num > msi_count)
 		return -EINVAL;
@@ -506,7 +507,7 @@ static int cdns_pcie_ep_send_msix_irq(struct cdns_pcie_ep *ep, u8 fn, u8 vfn,
 
 	reg = cap + PCI_MSIX_TABLE;
 	tbl_offset = cdns_pcie_ep_fn_readl(pcie, fn, reg);
-	bir = tbl_offset & PCI_MSIX_TABLE_BIR;
+	bir = FIELD_GET(PCI_MSIX_TABLE_BIR, tbl_offset);
 	tbl_offset &= PCI_MSIX_TABLE_OFFSET;
 
 	msix_tbl = epf->epf_bar[bir]->addr + tbl_offset;
-- 
2.30.2