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.

Fixes: 95135bfa7ead ("MIPS: Lantiq: Deactivate most of the devices by default")
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Acked-by: John Crispin <john@phrozen.org>
Cc: hauke.mehrtens@lantiq.com
Cc: linux-mips@linux-mips.org
Cc: <stable@vger.kernel.org> # 4.4.x-
Patchwork: https://patchwork.linux-mips.org/patch/15078/
Signed-off-by: James Hogan <james.hogan@imgtec.com>

diff --git a/arch/mips/lantiq/xway/sysctrl.c b/arch/mips/lantiq/xway/sysctrl.c
index ba9f358..3c3aa05 100644 (file)
--- a/arch/mips/lantiq/xway/sysctrl.c
+++ b/arch/mips/lantiq/xway/sysctrl.c
@@ -545,7 +545,7 @@ 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")) {
@@ -553,7 +553,7 @@ 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);
@@ -575,11 +575,11 @@ 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);