| Message ID | 20170110112857.30074-1-sjoerd.simons@collabora.co.uk |
|---|---|
| State | Accepted |
| Commit | 701e740f59bb1108485f1cb8e1b54248eee3ff87 |
| Headers | show |
Hello Sjoerd, On 01/10/2017 08:28 AM, Sjoerd Simons wrote: > For snow when chainloading u-boot the CPU seems to be running at full > speed. The lower CPU voltage seems to be ok for u-boot, but when booting > linux (bringing up all cores) I'm seeing random crashes. > > Bump the voltage up to a level that's safe for all cpu frequencies. > > Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk> > > --- > Your patch looks good to me, 1.3V matches the operating point defined in the Exynos5250.dtsi for the maximum CPU frequency (1.7 GHz). Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com> Best regards, -- Javier Martinez Canillas Open Source Group Samsung Research America _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
On Tuesday, 10 January 2017, Javier Martinez Canillas < javier@osg.samsung.com> wrote: > Hello Sjoerd, > > On 01/10/2017 08:28 AM, Sjoerd Simons wrote: > > For snow when chainloading u-boot the CPU seems to be running at full > > speed. The lower CPU voltage seems to be ok for u-boot, but when booting > > linux (bringing up all cores) I'm seeing random crashes. > > > > Bump the voltage up to a level that's safe for all cpu frequencies. > > > > Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk > <javascript:;>> > > > > --- > > > > Your patch looks good to me, 1.3V matches the operating point defined > in the Exynos5250.dtsi for the maximum CPU frequency (1.7 GHz). > > Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com > <javascript:;>> > > Best regards, > -- > Javier Martinez Canillas > Open Source Group > Samsung Research America > _______________________________________________ > U-Boot mailing list > U-Boot@lists.denx.de <javascript:;> > http://lists.denx.de/mailman/listinfo/u-boot > applied to u-boot-samsung Thanks -- Thanks. Minkyu Kang. _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
diff --git a/board/samsung/common/exynos5-dt.c b/board/samsung/common/exynos5-dt.c index 2e3b16df45..aec1f396b0 100644 --- a/board/samsung/common/exynos5-dt.c +++ b/board/samsung/common/exynos5-dt.c @@ -123,13 +123,7 @@ int exynos_power_init(void) if (ret) return ret; - /* - * This would normally be 1.3V, but since we are running slowly 1.1V - * is enough. For spring it helps reduce CPU temperature and avoid - * hangs with the case open. 1.1V is minimum voltage borderline for - * chained bootloaders. - */ - ret = exynos_set_regulator("vdd_arm", 1100000); + ret = exynos_set_regulator("vdd_arm", 1300000); if (ret) return ret; ret = exynos_set_regulator("vdd_int", 1012500);
For snow when chainloading u-boot the CPU seems to be running at full speed. The lower CPU voltage seems to be ok for u-boot, but when booting linux (bringing up all cores) I'm seeing random crashes. Bump the voltage up to a level that's safe for all cpu frequencies. Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk> --- board/samsung/common/exynos5-dt.c | 8 +------- 1 file changed, 1 insertion(+), 7 deletions(-) -- 2.11.0 _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot