diff options
| author | Martin Blumenstingl <martin.blumenstingl@googlemail.com> | 2018-11-15 23:40:44 +0100 |
|---|---|---|
| committer | Neil Armstrong <narmstrong@baylibre.com> | 2018-11-23 15:11:57 +0100 |
| commit | a5ac1ead32c9aac285f6436e09b4f6111996e9b8 (patch) | |
| tree | 9f3b64d743d0693c1fac5fd8df2ebffdf37348bf /drivers/clk/clk.c | |
| parent | d6e81845b7d900f1f6738bd972bf89dff4bd55a8 (diff) | |
clk: meson: meson8b: do not use cpu_div3 for cpu_scale_out_sel
The cpu_div3 clock (cpu_in divided by 3) generates a signal with a duty
cycle of 33%. The CPU clock however requires a clock signal with a duty
cycle of 50% to run stable.
cpu_div3 was observed to be problematic when cycling through all
available CPU frequencies (with additional patches on top of this one)
while running "stress --cpu 4" in the background. This caused sporadic
hangs where the whole system would fully lock up.
Amlogic's 3.10 kernel code also does not use the cpu_div3 clock either
when changing the CPU clock.
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://lkml.kernel.org/r/20181115224048.13511-3-martin.blumenstingl@googlemail.com
Diffstat (limited to 'drivers/clk/clk.c')
0 files changed, 0 insertions, 0 deletions