On Thu, Sep 26, 2019 at 10:17:54PM +0300, Dmitry Osipenko wrote: > It is possible to get a lockup if kernel decides to enter LP2 cpuidle > from some clk-notifier, in that case CCF's "prepare" mutex is kept locked > and thus clk_get_rate(pclk) blocks on the same mutex with interrupts being > disabled, hanging machine. > > Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx> > --- > > Changelog: > > v5: Clk notifier now takes powergates_lock to avoid potential racing with > tegra_io_pad_*(). > > The original fallback to 100MHz when clk_get_rate() fails is preserved > now. > > v4: Added clk-notifier to track PCLK rate-changes, which may become useful > in the future. That's done in response to v3 review comment from Peter > De Schrijver. > > Now properly handling case where clk pointer is intentionally NULL on > the driver's probe. > > v3: Changed commit's message because I actually recalled what was the > initial reason for the patch, since the problem reoccurred once again. > > v2: Addressed review comments that were made by Jon Hunter to v1 by > not moving the memory barrier, replacing one missed clk_get_rate() > with pmc->rate, handling possible clk_get_rate() error on probe and > slightly adjusting the commits message. > > drivers/soc/tegra/pmc.c | 71 ++++++++++++++++++++++++++++++++--------- > 1 file changed, 56 insertions(+), 15 deletions(-) Applied to for-5.5/soc, thanks. Thierry
Attachment:
signature.asc
Description: PGP signature
