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[v3,4/8] PCI: tegra194: Use FIELD_GET()/FIELD_PREP() with Link Width fields

Message ID 20230919125648.1920-5-ilpo.jarvinen@linux.intel.com (mailing list archive)
State Accepted
Delegated to: Bjorn Helgaas
Headers show
Series PCI/treewide: PCIe capability access cleanups | expand

Commit Message

Ilpo Järvinen Sept. 19, 2023, 12:56 p.m. UTC 
Use FIELD_GET() to extract PCIe Negotiated Link Width field instead of
custom masking and shifting.

Similarly, change custom code that misleadingly used
PCI_EXP_LNKSTA_NLW_SHIFT to prepare value for PCI_EXP_LNKCAP write
to use FIELD_PREP() with correct field define (PCI_EXP_LNKCAP_MLW).

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 drivers/pci/controller/dwc/pcie-tegra194.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)
diff mbox series

Patch

diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
index 4bba31502ce1..248cd9347e8f 100644
--- a/drivers/pci/controller/dwc/pcie-tegra194.c
+++ b/drivers/pci/controller/dwc/pcie-tegra194.c
@@ -9,6 +9,7 @@ 
  * Author: Vidya Sagar <vidyas@nvidia.com>
  */
 
+#include <linux/bitfield.h>
 #include <linux/clk.h>
 #include <linux/debugfs.h>
 #include <linux/delay.h>
@@ -346,8 +347,7 @@  static void apply_bad_link_workaround(struct dw_pcie_rp *pp)
 	 */
 	val = dw_pcie_readw_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKSTA);
 	if (val & PCI_EXP_LNKSTA_LBMS) {
-		current_link_width = (val & PCI_EXP_LNKSTA_NLW) >>
-				     PCI_EXP_LNKSTA_NLW_SHIFT;
+		current_link_width = FIELD_GET(PCI_EXP_LNKSTA_NLW, val);
 		if (pcie->init_link_width > current_link_width) {
 			dev_warn(pci->dev, "PCIe link is bad, width reduced\n");
 			val = dw_pcie_readw_dbi(pci, pcie->pcie_cap_base +
@@ -760,8 +760,7 @@  static void tegra_pcie_enable_system_interrupts(struct dw_pcie_rp *pp)
 
 	val_w = dw_pcie_readw_dbi(&pcie->pci, pcie->pcie_cap_base +
 				  PCI_EXP_LNKSTA);
-	pcie->init_link_width = (val_w & PCI_EXP_LNKSTA_NLW) >>
-				PCI_EXP_LNKSTA_NLW_SHIFT;
+	pcie->init_link_width = FIELD_GET(PCI_EXP_LNKSTA_NLW, val_w);
 
 	val_w = dw_pcie_readw_dbi(&pcie->pci, pcie->pcie_cap_base +
 				  PCI_EXP_LNKCTL);
@@ -920,7 +919,7 @@  static int tegra_pcie_dw_host_init(struct dw_pcie_rp *pp)
 	/* Configure Max lane width from DT */
 	val = dw_pcie_readl_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKCAP);
 	val &= ~PCI_EXP_LNKCAP_MLW;
-	val |= (pcie->num_lanes << PCI_EXP_LNKSTA_NLW_SHIFT);
+	val |= FIELD_PREP(PCI_EXP_LNKCAP_MLW, pcie->num_lanes);
 	dw_pcie_writel_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKCAP, val);
 
 	/* Clear Slot Clock Configuration bit if SRNS configuration */