Messages in this thread Patch in this message | | | From | Viresh Kumar <> | Subject | [PATCH - stable v5.4 and v5.7] opp: Enable resources again if they were disabled earlier | Date | Mon, 24 Aug 2020 14:52:23 +0530 |
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From: Rajendra Nayak <rnayak@codeaurora.org>
commit a4501bac0e553bed117b7e1b166d49731caf7260 upstream.
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> [ Viresh: Updated the patch to apply to v5.4 ] Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> --- drivers/opp/core.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/opp/core.c b/drivers/opp/core.c index 9ff0538ee83a..518442be638d 100644 --- a/drivers/opp/core.c +++ b/drivers/opp/core.c @@ -843,10 +843,12 @@ 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) { + dev_dbg(dev, "%s: old/new frequencies (%lu Hz) are same, nothing to do\n", + __func__, freq); + ret = 0; + goto put_opp_table; + } } temp_freq = old_freq; -- 2.25.0.rc1.19.g042ed3e048af
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