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r8169: disable RTL8126 ZRX-DC timeout

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[ Upstream commit b48688ea3c9ac8d5d910c6e91fb7f80d846581f0 ]

Disable it due to it dose not meet ZRX-DC specification. If it is enabled,
device will exit L1 substate every 100ms. Disable it for saving more power
in L1 substate.

Signed-off-by: ChunHao Lin <hau@realtek.com>
Reviewed-by: Heiner Kallweit <hkallweit1@gmail.com>
Link: https://patch.msgid.link/20250318083721.4127-3-hau@realtek.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
ChunHao Lin
2025-03-18 16:37:21 +08:00
committed by Greg Kroah-Hartman
parent e63b634806
commit 2780aa8394
1 changed files with 27 additions and 0 deletions
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27
drivers/net/ethernet/realtek/r8169_main.c
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@@ -2850,6 +2850,32 @@ static u32 rtl_csi_read(struct rtl8169_private *tp, int addr)
RTL_R32(tp, CSIDR) : ~0;
}
static void rtl_disable_zrxdc_timeout(struct rtl8169_private *tp)
{
struct pci_dev *pdev = tp->pci_dev;
u32 csi;
int rc;
u8 val;
#define RTL_GEN3_RELATED_OFF 0x0890
#define RTL_GEN3_ZRXDC_NONCOMPL 0x1
if (pdev->cfg_size > RTL_GEN3_RELATED_OFF) {
rc = pci_read_config_byte(pdev, RTL_GEN3_RELATED_OFF, &val);
if (rc == PCIBIOS_SUCCESSFUL) {
val &= ~RTL_GEN3_ZRXDC_NONCOMPL;
rc = pci_write_config_byte(pdev, RTL_GEN3_RELATED_OFF,
val);
if (rc == PCIBIOS_SUCCESSFUL)
return;
}
}
netdev_notice_once(tp->dev,
"No native access to PCI extended config space, falling back to CSI\n");
csi = rtl_csi_read(tp, RTL_GEN3_RELATED_OFF);
rtl_csi_write(tp, RTL_GEN3_RELATED_OFF, csi & ~RTL_GEN3_ZRXDC_NONCOMPL);
}
static void rtl_set_aspm_entry_latency(struct rtl8169_private *tp, u8 val)
{
struct pci_dev *pdev = tp->pci_dev;
@@ -3816,6 +3842,7 @@ static void rtl_hw_start_8125b(struct rtl8169_private *tp)
static void rtl_hw_start_8126a(struct rtl8169_private *tp)
{
rtl_disable_zrxdc_timeout(tp);
rtl_set_def_aspm_entry_latency(tp);
rtl_hw_start_8125_common(tp);
}