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authorJulius Werner <jwerner@chromium.org>2014-10-06 15:02:12 -0700
committerPatrick Georgi <pgeorgi@google.com>2015-04-08 08:48:03 +0200
commitf8dcdea60973b729bf9eee0fb46dccf1b4b2aeb6 (patch)
tree42e70faf8b8c91e98e13d6f86f95c78e9e9f122a /src/northbridge/dmp/vortex86ex/raminit.c
parent558614d4d38d149865c2186802548eec55a03082 (diff)
rk3288: Fix some PLL divisors and improve clock code
This patch does some general cleanup in the Rockchip clock code, and adds some more assertions regarding the PLL VCO and output frequency ranges. It changes all PLL divisors to use the lowest values that can still hit the target frequency, since higher NR values lead to higher jitter and higher NO values increase power draw. Also change DDR3 frequency code to hardcode the optimal divisors for certail frequencies. As a little hack we will interpret 666000000 to actually mean 666666666.6P (and analogous for 533MHz), since that's what you usually want for memory. BUG=chrome-os-partner:32139 TEST=Boot on veyron_pinky rev2, check that dpll_is shown as 666666666 in /sys/kernel/debug/clk/clk_summary. Change-Id: I57d7ef34500984184e010c0cc7d73789338834d4 Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Original-Commit-Id: 7466ffc035b3f06ac280f412bc496059abf3239c Original-Change-Id: I4f3c39641955a95c6dfbe9334035eb670b138bf0 Original-Signed-off-by: Julius Werner <jwerner@chromium.org> Original-Reviewed-on: https://chromium-review.googlesource.com/221801 Reviewed-on: http://review.coreboot.org/9339 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'src/northbridge/dmp/vortex86ex/raminit.c')
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