The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From a4501bac0e553bed117b7e1b166d49731caf7260 Mon Sep 17 00:00:00 2001

From: Rajendra Nayak rnayak@codeaurora.org Date: Mon, 10 Aug 2020 12:36:19 +0530 Subject: [PATCH] opp: Enable resources again if they were disabled earlier

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: cd7ea582866f ("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 Reviewed-by: Stephen Boyd sboyd@kernel.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

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; + } }

/*