[PATCH v2 08/10] PCI: aardvark: Don't write read-only bits explicitly in PCI_ERR_CAP register

[Marek Behún]

The bits PCI_ERR_CAP_ECRC_GENC and PCI_ERR_CAP_ECRC_CHKC are read only,
reporting the capability of ECRC. Don't write them explicitly, instead
read the register (where they are set), and add the bits that enable
these features.

Signed-off-by: Marek Behún <kabel at kernel.org>
---
 drivers/pci/controller/pci-aardvark.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
index 4855ac733484..e816ab726f66 100644
--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -584,9 +584,9 @@ static void advk_pcie_setup_hw(struct advk_pcie *pcie)
 	reg &= ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
 	advk_writel(pcie, reg, PCIE_CORE_CMD_STATUS_REG);
 
-	/* Set Advanced Error Capabilities and Control PF0 register */
-	reg = PCI_ERR_CAP_ECRC_GENC | PCI_ERR_CAP_ECRC_GENE |
-	      PCI_ERR_CAP_ECRC_CHKC | PCI_ERR_CAP_ECRC_CHKE;
+	/* Enable generation and checking of ECRC on Root Bridge */
+	reg = advk_readl(pcie, PCIE_CORE_PCIERR_CAP + PCI_ERR_CAP);
+	reg |= PCI_ERR_CAP_ECRC_GENE | PCI_ERR_CAP_ECRC_CHKE;
 	advk_writel(pcie, reg, PCIE_CORE_PCIERR_CAP + PCI_ERR_CAP);
 
 	/* Set PCIe Device Control register */
-- 
2.35.1