This is a note to let you know that I've just added the patch titled
ARM: kirkwood: fix to retain gbe MAC addresses for DT kernels
to the 3.8-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:
arm-kirkwood-fix-to-retain-gbe-mac-addresses-for-dt-kernels.patch
and it can be found in the queue-3.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7bf5b408b419fc849578e6e9fbd221bf43638eb6 Mon Sep 17 00:00:00 2001
From: Sebastian Hesselbarth <sebastian.hesselbarth@xxxxxxxxx>
Date: Wed, 30 Jan 2013 21:29:58 +0100
Subject: ARM: kirkwood: fix to retain gbe MAC addresses for DT kernels
From: Sebastian Hesselbarth <sebastian.hesselbarth@xxxxxxxxx>
commit 7bf5b408b419fc849578e6e9fbd221bf43638eb6 upstream.
The ethernet controller used on kirkwood looses its MAC address
register contents when the corresponding clock is gated. As soon as
mv643xx_eth is built as module, the clock gets gated and when loading
the module, the MAC address is gone.
Proper DT support for the mv643xx_eth driver is expected soon, so we add
a workaround to always enable ge0/ge1 clocks on kirkwood. This workaround
is also already used on non-DT kirkwood kernels.
Reported-by: Simon Baatz <gmbnomis@xxxxxxxxx>
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@xxxxxxxxx>
Tested-by: Simon Baatz <gmbnomis@xxxxxxxxx>
Signed-off-by: Jason Cooper <jason@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm/mach-kirkwood/board-dt.c | 24 +++++++++++++++---------
1 file changed, 15 insertions(+), 9 deletions(-)
--- a/arch/arm/mach-kirkwood/board-dt.c
+++ b/arch/arm/mach-kirkwood/board-dt.c
@@ -41,16 +41,12 @@ static void __init kirkwood_legacy_clk_i
struct device_node *np = of_find_compatible_node(
NULL, NULL, "marvell,kirkwood-gating-clock");
-
struct of_phandle_args clkspec;
+ struct clk *clk;
clkspec.np = np;
clkspec.args_count = 1;
- clkspec.args[0] = CGC_BIT_GE0;
- orion_clkdev_add(NULL, "mv643xx_eth_port.0",
- of_clk_get_from_provider(&clkspec));
-
clkspec.args[0] = CGC_BIT_PEX0;
orion_clkdev_add("0", "pcie",
of_clk_get_from_provider(&clkspec));
@@ -63,14 +59,24 @@ static void __init kirkwood_legacy_clk_i
orion_clkdev_add("1", "pcie",
of_clk_get_from_provider(&clkspec));
- clkspec.args[0] = CGC_BIT_GE1;
- orion_clkdev_add(NULL, "mv643xx_eth_port.1",
- of_clk_get_from_provider(&clkspec));
-
clkspec.args[0] = CGC_BIT_SDIO;
orion_clkdev_add(NULL, "mvsdio",
of_clk_get_from_provider(&clkspec));
+ /*
+ * The ethernet interfaces forget the MAC address assigned by
+ * u-boot if the clocks are turned off. Until proper DT support
+ * is available we always enable them for now.
+ */
+ clkspec.args[0] = CGC_BIT_GE0;
+ clk = of_clk_get_from_provider(&clkspec);
+ orion_clkdev_add(NULL, "mv643xx_eth_port.0", clk);
+ clk_prepare_enable(clk);
+
+ clkspec.args[0] = CGC_BIT_GE1;
+ clk = of_clk_get_from_provider(&clkspec);
+ orion_clkdev_add(NULL, "mv643xx_eth_port.1", clk);
+ clk_prepare_enable(clk);
}
static void __init kirkwood_of_clk_init(void)
Patches currently in stable-queue which might be from sebastian.hesselbarth@xxxxxxxxx are
queue-3.8/arm-kirkwood-fix-to-retain-gbe-mac-addresses-for-dt-kernels.patch
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