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Subject[PATCH V2 1/4] opp: Enable resources again if they were disabled earlier
Date
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;
+ }
}

/*
--
2.14.1
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