linux-kernel - [PATCH 5/7] PCI/DPC: Use defined fields with DPC

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Message-Id: <20231018113254.17616-6-ilpo.jarvinen@linux.intel.com>
Date:   Wed, 18 Oct 2023 14:32:52 +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>,
        Mahesh J Salgaonkar <mahesh@...ux.ibm.com>,
        "Oliver O'Halloran" <oohall@...il.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Cc:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [PATCH 5/7] PCI/DPC: Use defined fields with DPC_CTL register

Instead of using a literal to clear bits, add PCI_EXP_DPC_CTL_EN_MASK
and use the usual pattern to modify a bitfield.

While at it, rearrange RMW code more logically together.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
---
 drivers/pci/pcie/dpc.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c
index a5c259ada9ea..0048a11bd119 100644
--- a/drivers/pci/pcie/dpc.c
+++ b/drivers/pci/pcie/dpc.c
@@ -18,6 +18,9 @@
 #include "portdrv.h"
 #include "../pci.h"
 
+#define PCI_EXP_DPC_CTL_EN_MASK	(PCI_EXP_DPC_CTL_EN_FATAL | \
+				 PCI_EXP_DPC_CTL_EN_NONFATAL)
+
 static const char * const rp_pio_error_string[] = {
 	"Configuration Request received UR Completion",	 /* Bit Position 0  */
 	"Configuration Request received CA Completion",	 /* Bit Position 1  */
@@ -369,12 +372,13 @@ static int dpc_probe(struct pcie_device *dev)
 	}
 
 	pci_read_config_word(pdev, pdev->dpc_cap + PCI_EXP_DPC_CAP, &cap);
-	pci_read_config_word(pdev, pdev->dpc_cap + PCI_EXP_DPC_CTL, &ctl);
 
-	ctl = (ctl & 0xfff4) | PCI_EXP_DPC_CTL_EN_FATAL | PCI_EXP_DPC_CTL_INT_EN;
+	pci_read_config_word(pdev, pdev->dpc_cap + PCI_EXP_DPC_CTL, &ctl);
+	ctl &= ~PCI_EXP_DPC_CTL_EN_MASK;
+	ctl |= PCI_EXP_DPC_CTL_EN_FATAL | PCI_EXP_DPC_CTL_INT_EN;
 	pci_write_config_word(pdev, pdev->dpc_cap + PCI_EXP_DPC_CTL, ctl);
-	pci_info(pdev, "enabled with IRQ %d\n", dev->irq);
 
+	pci_info(pdev, "enabled with IRQ %d\n", dev->irq);
 	pci_info(pdev, "error containment capabilities: Int Msg #%d, RPExt%c PoisonedTLP%c SwTrigger%c RP PIO Log %d, DL_ActiveErr%c\n",
 		 cap & PCI_EXP_DPC_IRQ, FLAG(cap, PCI_EXP_DPC_CAP_RP_EXT),
 		 FLAG(cap, PCI_EXP_DPC_CAP_POISONED_TLP),
-- 
2.30.2