[openwrt/openwrt] realtek: rtl931x: Support enable/disable SMI Polling for SerDes ports

[LEDE Commits]

robimarko pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/d802e6310a013a4255392c73967a243a773c8799

commit d802e6310a013a4255392c73967a243a773c8799
Author: Harshal Gohel <hg at simonwunderlich.de>
AuthorDate: Tue Jun 17 13:03:47 2025 +0000

    realtek: rtl931x: Support enable/disable SMI Polling for SerDes ports
    
    During PHY matching, the SMI polling must be disabled to avoid conflicts
    during the complex detection routine. Only after this finished, SMI polling
    is allowed again.
    
    This was implemented for all realtek families besides RTL931x.
    
    Signed-off-by: Harshal Gohel <hg at simonwunderlich.de>
    Signed-off-by: Sharadanand Karanjkar <sk at simonwunderlich.de>
    Link: https://github.com/openwrt/openwrt/pull/19603
    Signed-off-by: Robert Marko <robimarko at gmail.com>
---
 target/linux/realtek/files-6.12/drivers/net/phy/rtl83xx-phy.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/target/linux/realtek/files-6.12/drivers/net/phy/rtl83xx-phy.c b/target/linux/realtek/files-6.12/drivers/net/phy/rtl83xx-phy.c
index 65e7e12117..85399151db 100644
--- a/target/linux/realtek/files-6.12/drivers/net/phy/rtl83xx-phy.c
+++ b/target/linux/realtek/files-6.12/drivers/net/phy/rtl83xx-phy.c
@@ -120,7 +120,10 @@ static u64 disable_polling(int port)
 		sw_w32_mask(BIT(port), 0, RTL930X_SMI_POLL_CTRL);
 		break;
 	case RTL9310_FAMILY_ID:
-		pr_warn("%s not implemented for RTL931X\n", __func__);
+		saved_state = sw_r32(RTL931X_SMI_PORT_POLLING_CTRL + 4);
+		saved_state <<= 32;
+		saved_state |= sw_r32(RTL931X_SMI_PORT_POLLING_CTRL);
+		sw_w32_mask(BIT(port % 32), 0, RTL931X_SMI_PORT_POLLING_CTRL + ((port >> 5) << 2));
 		break;
 	}
 
@@ -145,7 +148,8 @@ static int resume_polling(u64 saved_state)
 		sw_w32(saved_state, RTL930X_SMI_POLL_CTRL);
 		break;
 	case RTL9310_FAMILY_ID:
-		pr_warn("%s not implemented for RTL931X\n", __func__);
+		sw_w32(saved_state >> 32, RTL931X_SMI_PORT_POLLING_CTRL + 4);
+		sw_w32(saved_state, RTL931X_SMI_PORT_POLLING_CTRL);
 		break;
 	}