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PCI: tegra194: Use FIELD_GET()/FIELD_PREP() with Link Width fields

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[ Upstream commit 759574abd78e3b47ec45bbd31a64e8832cf73f97 ]

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).

Link: https://lore.kernel.org/r/20230919125648.1920-5-ilpo.jarvinen@linux.intel.com
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ilpo Järvinen 2023-09-19 15:56:44 +03:00 • committed by Greg Kroah-Hartman
parent b7d773ea9b
commit b92d2f5ea8
1 changed files with 4 additions and 5 deletions
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9
drivers/pci/controller/dwc/pcie-tegra194.c
View file

@ -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 */