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authorJanne Huttunen <janne.huttunen@nokia.com>2015-08-13 16:21:33 +0300
committerRalf Baechle <ralf@linux-mips.org>2015-09-03 13:08:08 +0300
commitc0034c30ed301e28c72dc516156baabf5840ce5f (patch)
treeae51392d6dc6daf61e699555380bb37832a7f409 /arch
parentaf0cfb2c44ee5cd3c86d1ffd054d318f536cb6dd (diff)
downloadlinux-c0034c30ed301e28c72dc516156baabf5840ce5f.tar.xz
MIPS: Octeon: Fix CN6880 hang on XAUI init
Some CN68XX series Octeon II chips seem to hang if a reset is issued on XAUI initialization. Avoid the hang by disabling the reset on affected models. Tested on Cavium EBB6800 evaluation board and Kontron S1901 board. Signed-off-by: Janne Huttunen <janne.huttunen@nokia.com> Signed-off-by: Aaro Koskinen <aaro.koskinen@nokia.com> Acked-by: David Daney <david.daney@cavium.com> Cc: David Daney <ddaney.cavm@gmail.com> Cc: linux-mips@linux-mips.org Cc: Janne Huttunen <janne.huttunen@nokia.com> Cc: Aaro Koskinen <aaro.koskinen@nokia.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: devel@driverdev.osuosl.org Patchwork: http://patchwork.linux-mips.org/patch/10970/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/mips/cavium-octeon/executive/cvmx-helper-xaui.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/mips/cavium-octeon/executive/cvmx-helper-xaui.c b/arch/mips/cavium-octeon/executive/cvmx-helper-xaui.c
index 7653b7e92197..323a784f7071 100644
--- a/arch/mips/cavium-octeon/executive/cvmx-helper-xaui.c
+++ b/arch/mips/cavium-octeon/executive/cvmx-helper-xaui.c
@@ -151,7 +151,12 @@ int __cvmx_helper_xaui_enable(int interface)
/* (4)c Aply reset sequence */
xauiCtl.u64 = cvmx_read_csr(CVMX_PCSXX_CONTROL1_REG(interface));
xauiCtl.s.lo_pwr = 0;
- xauiCtl.s.reset = 1;
+
+ /* Issuing a reset here seems to hang some CN68XX chips. */
+ if (!OCTEON_IS_MODEL(OCTEON_CN68XX_PASS1_X) &&
+ !OCTEON_IS_MODEL(OCTEON_CN68XX_PASS2_X))
+ xauiCtl.s.reset = 1;
+
cvmx_write_csr(CVMX_PCSXX_CONTROL1_REG(interface), xauiCtl.u64);
/* Wait for PCS to come out of reset */