Martin Roth (martinroth@google.com) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/16235
-gerrit
commit afc8da91c4fb08662399c0266375c4a744017be3 Author: Julius Werner jwerner@chromium.org Date: Thu Aug 11 16:37:57 2016 -0700
google/gru: Add new PWM regulator duty numbers for revision 6
We're changing the PWM regulator bounds on Kevin from rev6 onwards, so we'll need to use different duty cycle values for them. We really want a proper PWM regulator driver that can calculate these values automatically from voltages, but until we have that this patch just hardcodes the new numbers in.
(Yes, this is a patch for the mainboard/google/gru board family that only touches a file from the rockchip/rk3399 SoC. That too is something that'll be fixed up in a later CL.)
BRANCH=None BUG=chrome-os-partner:54888 TEST=Booted Kevin rev4 (for whatever that's worth...).
Change-Id: Ibb6ab5c6517d83ffb5e32cb17d0de33e8ec10293 Signed-off-by: Martin Roth martinroth@chromium.org Original-Commit-Id: 4cb2a939295e2b6443c5dbd3374982224322304b Original-Change-Id: I8757cc54f2478d20bb948a1a0a7398b0404a7b1f Original-Signed-off-by: Julius Werner jwerner@chromium.org Original-Reviewed-on: https://chromium-review.googlesource.com/368410 Original-Commit-Ready: Dan Shi dshi@chromium.org Original-Reviewed-by: Douglas Anderson dianders@chromium.org --- src/soc/rockchip/rk3399/romstage.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/src/soc/rockchip/rk3399/romstage.c b/src/soc/rockchip/rk3399/romstage.c index 8adaa7c..ccf42b9 100644 --- a/src/soc/rockchip/rk3399/romstage.c +++ b/src/soc/rockchip/rk3399/romstage.c @@ -79,12 +79,24 @@ static void init_dvs_outputs(void) */ duty_ns = 2860; /* 0.9v */
+ /* TODO: Clean all this up, implement proper pwm_regulator driver. */ if (IS_ENABLED(CONFIG_BOARD_GOOGLE_KEVIN)) { id = board_id(); if (id <= 2) duty_ns = 1906; /* 1.1v */ else if (id == 3) duty_ns = 2621; /* 0.95v */ + else if (id >= 6) { + /* GPU: 3337 * (12043 - 9000) / (12043 - 7984) = 2501 */ + pwm_init(0, 3337, 2501); + /* BIG: 3337 * (12837 - 9000) / (12837 - 7985) = 2638 */ + pwm_init(1, 3337, 2638); + /* LIT: 3337 * (12807 - 9000) / (12807 - 8009) = 2647 */ + pwm_init(2, 3337, 2647); + /* CTR: 3337 * (10507 - 9500) / (10507 - 7996) = 1338 */ + pwm_init(3, 3337, 1338); + return; + } }
for (i = 0; i < 4; i++)