Merge: r8169: System fail to enter suspend-to-idle with Realtek 5Gbe LAN Card inserted

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-10/-/merge_requests/798

JIRA: https://issues.redhat.com/browse/RHEL-88646

 * 3d9b8ac r8169: enable RTL8168H/RTL8168EP/RTL8168FP ASPM support
 * b48688e r8169: disable RTL8126 ZRX-DC timeout

Signed-off-by: CKI Backport Bot <cki-ci-bot+cki-gitlab-backport-bot@redhat.com>

---

<small>Created 2025-04-26 20:45 UTC by backporter - [KWF FAQ](https://red.ht/kernel_workflow_doc) - [Slack #team-kernel-workflow](https://redhat-internal.slack.com/archives/C04LRUPMJQ5) - [Source](https://gitlab.com/cki-project/kernel-workflow/-/blob/main/webhook/utils/backporter.py) - [Documentation](https://gitlab.com/cki-project/kernel-workflow/-/blob/main/docs/README.backporter.md) - [Report an issue](https://issues.redhat.com/secure/CreateIssueDetails!init.jspa?pid=12334433&issuetype=1&priority=4&summary=backporter+webhook+issue&components=kernel-workflow+/+backporter)</small>

Approved-by: Michal Schmidt <mschmidt@redhat.com>
Approved-by: José Ignacio Tornos Martínez <jtornosm@redhat.com>
Approved-by: CKI KWF Bot <cki-ci-bot+kwf-gitlab-com@redhat.com>

Merged-by: Julio Faracco <jfaracco@redhat.com>

Author: jcfaracco

drivers/net/ethernet/realtek/r8169_main.c

@@ -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);
 }
@@ -5358,7 +5385,7 @@ static void rtl_init_mac_address(struct rtl8169_private *tp)
 /* register is set if system vendor successfully tested ASPM 1.2 */
 static bool rtl_aspm_is_safe(struct rtl8169_private *tp)
 {
-	if (tp->mac_version >= RTL_GIGA_MAC_VER_61 &&
+	if (tp->mac_version >= RTL_GIGA_MAC_VER_46 &&
 	    r8168_mac_ocp_read(tp, 0xc0b2) & 0xf)
 		return true;