linux-kernel - [PATCH] arm: dts: socfpga: use reset-name "stmmaceth-ocp" instead of "ahb"

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Message-Id: <20241016074159.2723256-1-mamta.shukla@leica-geosystems.com>
Date: Wed, 16 Oct 2024 09:41:59 +0200
From: Mamta Shukla <mamta.shukla@...ca-geosystems.com>
To: dinguyen@...nel.org,
	alexandre.torgue@...s.st.com,
	joabreu@...opsys.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	mcoquelin.stm32@...il.com,
	linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Cc: bsp-development.geo@...ca-geosystems.com,
	Mamta Shukla <mamta.shukla@...ca-geosystems.com>
Subject: [PATCH] arm: dts: socfpga: use reset-name "stmmaceth-ocp" instead of "ahb"

The "stmmaceth-ocp" reset line in dwmac-socfpga driver is required
to get EMAC controller out of reset on Arria10[1].
Changed in Upstream to "ahb"(331085a423b  arm64: dts: socfpga: change the
reset-name of "stmmaceth-ocp" to "ahb" ).

If "ahb" reset-line is used, connection via ssh is found to be slow and significant
packet loss observed with ping. This prominently happens with Real Time Kernel
(PREEMPT_RT enabled). Further with STMMAC-SELFTEST Driver enabled, ethtool test
also FAILS.

$ ethtool -t eth0
[  322.946709] socfpga-dwmac ff800000.ethernet eth0: entered promiscuous mode
[  323.374558] socfpga-dwmac ff800000.ethernet eth0: left promiscuous mode
The test result is FAIL
The test extra info:
 1. MAC Loopback                 0
 2. PHY Loopback                 -110
 3. MMC Counters                 -110
 4. EEE                          -95
 5. Hash Filter MC               0
 6. Perfect Filter UC            -110
 7. MC Filter                    -110
 8. UC Filter                    0
 9. Flow Control                 -110
10. RSS                          -95
11. VLAN Filtering               -95
12. VLAN Filtering (perf)        -95
13. Double VLAN Filter           -95
14. Double VLAN Filter (perf)    -95
15. Flexible RX Parser           -95
16. SA Insertion (desc)          -95
17. SA Replacement (desc)        -95
18. SA Insertion (reg)           -95
19. SA Replacement (reg)         -95
20. VLAN TX Insertion            -95
21. SVLAN TX Insertion           -95
22. L3 DA Filtering              -95
23. L3 SA Filtering              -95
24. L4 DA TCP Filtering          -95
25. L4 SA TCP Filtering          -95
26. L4 DA UDP Filtering          -95
27. L4 SA UDP Filtering          -95
28. ARP Offload                  -95
29. Jumbo Frame                  -110
30. Multichannel Jumbo           -95
31. Split Header                 -95
32. TBS (ETF Scheduler)          -95

[  324.881327] socfpga-dwmac ff800000.ethernet eth0: Link is Down
[  327.995360] socfpga-dwmac ff800000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx

Link:[1] https://www.intel.com/content/www/us/en/docs/programmable/683711/21-2/functional-description-of-the-emac.html
Signed-off-by: Mamta Shukla <mamta.shukla@...ca-geosystems.com>
---
 arch/arm/boot/dts/intel/socfpga/socfpga_arria10.dtsi | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/arm/boot/dts/intel/socfpga/socfpga_arria10.dtsi b/arch/arm/boot/dts/intel/socfpga/socfpga_arria10.dtsi
index f36063c57c7f..72c55e5187ca 100644
--- a/arch/arm/boot/dts/intel/socfpga/socfpga_arria10.dtsi
+++ b/arch/arm/boot/dts/intel/socfpga/socfpga_arria10.dtsi
@@ -440,7 +440,7 @@ gmac0: ethernet@...00000 {
 			clocks = <&l4_mp_clk>, <&peri_emac_ptp_clk>;
 			clock-names = "stmmaceth", "ptp_ref";
 			resets = <&rst EMAC0_RESET>, <&rst EMAC0_OCP_RESET>;
-			reset-names = "stmmaceth", "ahb";
+			reset-names = "stmmaceth", "stmmaceth-ocp";
 			snps,axi-config = <&socfpga_axi_setup>;
 			status = "disabled";
 		};
@@ -460,7 +460,7 @@ gmac1: ethernet@...02000 {
 			clocks = <&l4_mp_clk>, <&peri_emac_ptp_clk>;
 			clock-names = "stmmaceth", "ptp_ref";
 			resets = <&rst EMAC1_RESET>, <&rst EMAC1_OCP_RESET>;
-			reset-names = "stmmaceth", "ahb";
+			reset-names = "stmmaceth", "stmmaceth-ocp";
 			snps,axi-config = <&socfpga_axi_setup>;
 			status = "disabled";
 		};
@@ -480,7 +480,7 @@ gmac2: ethernet@...04000 {
 			clocks = <&l4_mp_clk>, <&peri_emac_ptp_clk>;
 			clock-names = "stmmaceth", "ptp_ref";
 			resets = <&rst EMAC2_RESET>, <&rst EMAC2_OCP_RESET>;
-			reset-names = "stmmaceth", "ahb";
+			reset-names = "stmmaceth", "stmmaceth-ocp";
 			snps,axi-config = <&socfpga_axi_setup>;
 			status = "disabled";
 		};
-- 
2.25.1