[source] lantiq: fix an ethernet stability issue triggered by receving packets during boot

[LEDE Commits]

nbd pushed a commit to source.git, branch master:
https://git.lede-project.org/254ccf9f4ca608efd1674f2cc47b44b86a3a63f4

commit 254ccf9f4ca608efd1674f2cc47b44b86a3a63f4
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Thu Jan 19 14:25:09 2017 +0100

    lantiq: fix an ethernet stability issue triggered by receving packets during boot
    
    Disabling ethernet during reboot (only to enable it again when the
    ethernet driver attaches) can put the chip into a faulty state where it
    corrupts the header of all incoming packets.
    
    This happens if packets arrive during the time window where the core is
    disabled, and it can be easily reproduced by rebooting while sending a
    flood ping to the broadcast address.
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 ...-Lantiq-Keep-ethernet-enabled-during-boot.patch | 53 ++++++++++++++++++++++
 1 file changed, 53 insertions(+)

diff --git a/target/linux/lantiq/patches-4.4/0070-MIPS-Lantiq-Keep-ethernet-enabled-during-boot.patch b/target/linux/lantiq/patches-4.4/0070-MIPS-Lantiq-Keep-ethernet-enabled-during-boot.patch
new file mode 100644
index 0000000..67cf7d3
--- /dev/null
+++ b/target/linux/lantiq/patches-4.4/0070-MIPS-Lantiq-Keep-ethernet-enabled-during-boot.patch
@@ -0,0 +1,53 @@
+From: Felix Fietkau <nbd at nbd.name>
+Date: Thu, 19 Jan 2017 14:14:36 +0100
+Subject: [PATCH] MIPS: Lantiq: Keep ethernet enabled during boot
+
+Disabling ethernet during reboot (only to enable it again when the
+ethernet driver attaches) can put the chip into a faulty state where it
+corrupts the header of all incoming packets.
+
+This happens if packets arrive during the time window where the core is
+disabled, and it can be easily reproduced by rebooting while sending a
+flood ping to the broadcast address.
+
+Cc: john at phrozen.org
+Cc: hauke.mehrtens at lantiq.com
+Cc: stable at vger.kernel.org
+Fixes: 95135bfa7ead ("MIPS: Lantiq: Deactivate most of the devices by default")
+Signed-off-by: Felix Fietkau <nbd at nbd.name>
+---
+
+--- a/arch/mips/lantiq/xway/sysctrl.c
++++ b/arch/mips/lantiq/xway/sysctrl.c
+@@ -564,7 +564,7 @@ void __init ltq_soc_init(void)
+ 		clkdev_add_pmu("1a800000.pcie", "msi", 1, 1, PMU1_PCIE2_MSI);
+ 		clkdev_add_pmu("1a800000.pcie", "pdi", 1, 1, PMU1_PCIE2_PDI);
+ 		clkdev_add_pmu("1a800000.pcie", "ctl", 1, 1, PMU1_PCIE2_CTL);
+-		clkdev_add_pmu("1e108000.eth", NULL, 1, 0, PMU_SWITCH | PMU_PPE_DP);
++		clkdev_add_pmu("1e108000.eth", NULL, 0, 0, PMU_SWITCH | PMU_PPE_DP);
+ 		clkdev_add_pmu("1da00000.usif", "NULL", 1, 0, PMU_USIF);
+ 		clkdev_add_pmu("1e103100.deu", NULL, 1, 0, PMU_DEU);
+ 	} else if (of_machine_is_compatible("lantiq,ar10")) {
+@@ -572,7 +572,7 @@ void __init ltq_soc_init(void)
+ 				  ltq_ar10_fpi_hz(), ltq_ar10_pp32_hz());
+ 		clkdev_add_pmu("1e101000.usb", "ctl", 1, 0, PMU_USB0);
+ 		clkdev_add_pmu("1e106000.usb", "ctl", 1, 0, PMU_USB1);
+-		clkdev_add_pmu("1e108000.eth", NULL, 1, 0, PMU_SWITCH |
++		clkdev_add_pmu("1e108000.eth", NULL, 0, 0, PMU_SWITCH |
+ 			       PMU_PPE_DP | PMU_PPE_TC);
+ 		clkdev_add_pmu("1da00000.usif", "NULL", 1, 0, PMU_USIF);
+ 		clkdev_add_pmu("1f203000.rcu", "gphy", 1, 0, PMU_GPHY);
+@@ -594,11 +594,11 @@ void __init ltq_soc_init(void)
+ 		clkdev_add_pmu(NULL, "ahb", 1, 0, PMU_AHBM | PMU_AHBS);
+ 
+ 		clkdev_add_pmu("1da00000.usif", "NULL", 1, 0, PMU_USIF);
+-		clkdev_add_pmu("1e108000.eth", NULL, 1, 0,
++		clkdev_add_pmu("1e108000.eth", NULL, 0, 0,
+ 				PMU_SWITCH | PMU_PPE_DPLUS | PMU_PPE_DPLUM |
+ 				PMU_PPE_EMA | PMU_PPE_TC | PMU_PPE_SLL01 |
+ 				PMU_PPE_QSB | PMU_PPE_TOP);
+-		clkdev_add_pmu("1f203000.rcu", "gphy", 1, 0, PMU_GPHY);
++		clkdev_add_pmu("1f203000.rcu", "gphy", 0, 0, PMU_GPHY);
+ 		clkdev_add_pmu("1e103000.sdio", NULL, 1, 0, PMU_SDIO);
+ 		clkdev_add_pmu("1e103100.deu", NULL, 1, 0, PMU_DEU);
+ 		clkdev_add_pmu("1e116000.mei", "dfe", 1, 0, PMU_DFE);