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| author | Praveen Rao | 2013-08-08 13:47:43 -0500 |
|---|---|---|
| committer | Praneeth Bajjuri | 2013-08-09 17:05:33 -0500 |
| commit | e9d2d62aaf51514a2a84ef28262ef300b37df69a (patch) | |
| tree | 8c8726240d2bffee981c1479f8002a43df3308d3 /samples/kdb/kdb_hello.c | |
| parent | 6d90709163afd1f314ad688428bb929215f8e295 (diff) | |
| download | kernel-audio-master.tar.gz kernel-audio-master.tar.xz kernel-audio-master.zip | |
Use n_latch to hack the pcf8575 driver to "drive P10" to not hold ETH0
in reset.
Description: nETH_RST is a pin that controls the phy reset -> this was
the core of the issue -> we have pcf8575 GPIO expander on i2c1 whose
P10(ETH0) and P11(ETH1) hold or release the ETH from reset. On the very
first write by Display Panel driver (which rightly control's it's own
GPIO expander pin P15), all other pins are written as 0 -> since this is
the first write(by panel), this is precisely when pcf8575 starts to
drive the signal -> at this point the default pulls are overridden by
pcf8575's pulls. As ETH driver does not drive it's pin, the ETH0_RST is
driven low, holding Ethernet in reset.
Nishanth Menon helped in isolatng this issue.
REVISIT: This is a ethernet driver bug and has to be fixed properly post
release.
Change-Id: I45ddb1202761f052f8a8a04faf14b841da5af2ec
Signed-off-by: Praveen Rao <prao@ti.com>
Diffstat (limited to 'samples/kdb/kdb_hello.c')
0 files changed, 0 insertions, 0 deletions