From: Rajendra Nayak rnayak@codeaurora.org
dev_pm_opp_set_rate() can now be called with freq = 0 in order to either drop performance or bandwidth votes or to disable regulators on platforms which support them.
In such cases, a subsequent call to dev_pm_opp_set_rate() with the same frequency ends up returning early because 'old_freq == freq'
Instead make it fall through and put back the dropped performance and bandwidth votes and/or enable back the regulators.
Cc: v5.3+ stable@vger.kernel.org # v5.3+ Fixes: cd7ea582 ("opp: Make dev_pm_opp_set_rate() handle freq = 0 to drop performance votes") Reported-by: Sajida Bhanu sbhanu@codeaurora.org Reviewed-by: Sibi Sankar sibis@codeaurora.org Reported-by: Matthias Kaehlcke mka@chromium.org Tested-by: Matthias Kaehlcke mka@chromium.org Signed-off-by: Rajendra Nayak rnayak@codeaurora.org [ Viresh: Don't skip clk_set_rate() and massaged changelog ] Signed-off-by: Viresh Kumar viresh.kumar@linaro.org --- Hi Rajendra,
I wasn't able to test this stuff, please give it a try. I have simplified your patch and cleaned up a bunch of stuff as well.
drivers/opp/core.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/drivers/opp/core.c b/drivers/opp/core.c index bdb028c7793d..9668ea04cc80 100644 --- a/drivers/opp/core.c +++ b/drivers/opp/core.c @@ -934,10 +934,13 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
/* Return early if nothing to do */ if (old_freq == freq) { - dev_dbg(dev, "%s: old/new frequencies (%lu Hz) are same, nothing to do\n", - __func__, freq); - ret = 0; - goto put_opp_table; + if (!opp_table->required_opp_tables && !opp_table->regulators && + !opp_table->paths) { + dev_dbg(dev, "%s: old/new frequencies (%lu Hz) are same, nothing to do\n", + __func__, freq); + ret = 0; + goto put_opp_table; + } }
/*