From: <gregkh@linuxfoundation.org>
To: andrew+netdev@lunn.ch,chenhuacai@kernel.org,chenhuacai@loongson.cn,davem@davemloft.net,edumazet@google.com,gregkh@linuxfoundation.org,kernel@xen0n.name,kuba@kernel.org,loongarch@lists.linux.dev,pabeni@redhat.com,sashal@kernel.org,si.yanteng@linux.dev,wanghongliang@loongson.cn
Cc: <stable-commits@vger.kernel.org>
Subject: Patch "net: stmmac: dwmac-loongson: Set clk_csr_i to 100-150MHz" has been added to the 6.6-stable tree
Date: Thu, 19 Mar 2026 12:12:52 +0100 [thread overview]
Message-ID: <2026031952-uncrown-gondola-399d@gregkh> (raw)
In-Reply-To: <20260218121242.2545128-1-chenhuacai@loongson.cn>
This is a note to let you know that I've just added the patch titled
net: stmmac: dwmac-loongson: Set clk_csr_i to 100-150MHz
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-stmmac-dwmac-loongson-set-clk_csr_i-to-100-150mhz.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
From stable+bounces-217275-greg=kroah.com@vger.kernel.org Wed Feb 18 13:13:16 2026
From: Huacai Chen <chenhuacai@loongson.cn>
Date: Wed, 18 Feb 2026 20:12:42 +0800
Subject: net: stmmac: dwmac-loongson: Set clk_csr_i to 100-150MHz
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Sasha Levin <sashal@kernel.org>, Huacai Chen <chenhuacai@kernel.org>
Cc: Xuerui Wang <kernel@xen0n.name>, stable@vger.kernel.org, Andrew Lunn <andrew+netdev@lunn.ch>, "David S . Miller" <davem@davemloft.net>, Eric Dumazet <edumazet@google.com>, Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>, Yanteng Si <si.yanteng@linux.dev>, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, netdev@vger.kernel.org, Huacai Chen <chenhuacai@loongson.cn>, Hongliang Wang <wanghongliang@loongson.cn>
Message-ID: <20260218121242.2545128-1-chenhuacai@loongson.cn>
From: Huacai Chen <chenhuacai@loongson.cn>
commit e1aa5ef892fb4fa9014a25e87b64b97347919d37 upstream.
Current clk_csr_i setting of Loongson STMMAC (including LS7A1000/2000
and LS2K1000/2000/3000) are copy & paste from other drivers. In fact,
Loongson STMMAC use 125MHz clocks and need 62 freq division to within
2.5MHz, meeting most PHY MDC requirement. So fix by setting clk_csr_i
to 100-150MHz, otherwise some PHYs may link fail.
Cc: stable@vger.kernel.org
Fixes: 30bba69d7db40e7 ("stmmac: pci: Add dwmac support for Loongson")
Signed-off-by: Hongliang Wang <wanghongliang@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
@@ -14,7 +14,7 @@
static int loongson_default_data(struct plat_stmmacenet_data *plat)
{
- plat->clk_csr = 2; /* clk_csr_i = 20-35MHz & MDC = clk_csr_i/16 */
+ plat->clk_csr = 1; /* clk_csr_i = 100-150MHz & MDC = clk_csr_i/62 */
plat->has_gmac = 1;
plat->force_sf_dma_mode = 1;
Patches currently in stable-queue which might be from chenhuacai@loongson.cn are
queue-6.6/net-stmmac-dwmac-loongson-set-clk_csr_i-to-100-150mhz.patch
prev parent reply other threads:[~2026-03-19 11:13 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-18 12:12 [PATCH for 6.6] net: stmmac: dwmac-loongson: Set clk_csr_i to 100-150MHz Huacai Chen
2026-03-19 11:12 ` gregkh [this message]
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