linux-kernel - [PATCH 5.0 193/238] PM / OPP: Update performance state when freq == old

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Message-Id: <20190322111309.590147242@linuxfoundation.org>
Date:   Fri, 22 Mar 2019 12:16:52 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Niklas Cassel <niklas.cassel@...aro.org>,
        Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@...aro.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: [PATCH 5.0 193/238] PM / OPP: Update performance state when freq == old_freq

5.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Viresh Kumar <viresh.kumar@...aro.org>

commit faef080f6db5320011862f7baf1aa66d0851559f upstream.

At boot up, CPUFreq core performs a sanity check to see if the system is
running at a frequency defined in the frequency table of the CPU. If so,
we try to find a valid frequency (lowest frequency greater than the
currently programmed frequency) from the table and set it. When the call
reaches dev_pm_opp_set_rate(), it calls _find_freq_ceil(opp_table,
&old_freq) to find the previously configured OPP and this call also
updates the old_freq. This eventually sets the old_freq == freq (new
target requested by cpufreq core) and we skip updating the performance
state in this case.

Fix this by also updating the performance state when the old_freq ==
freq.

Fixes: ca1b5d77b1c6 ("OPP: Configure all required OPPs")
Cc: v5.0 <stable@...r.kernel.org> # v5.0
Reported-by: Niklas Cassel <niklas.cassel@...aro.org>
Tested-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@...aro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/opp/core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -743,7 +743,7 @@ int dev_pm_opp_set_rate(struct device *d
 		old_freq, freq);

 	/* Scaling up? Configure required OPPs before frequency */
-	if (freq > old_freq) {
+	if (freq >= old_freq) {
 		ret = _set_required_opps(dev, opp_table, opp);
 		if (ret)
 			goto put_opp;