linux-kernel - [PATCH] cpufreq: enable 1200Mhz clock speed for armada-37xx

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Date: Sun,  2 Jun 2024 18:26:38 -0700
From: Benjamin Schneider <bschnei@...il.com>
To: Andrew Lunn <andrew@...n.ch>,
	Gregory Clement <gregory.clement@...tlin.com>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc: Benjamin Schneider <ben@...s.haus>
Subject: [PATCH] cpufreq: enable 1200Mhz clock speed for armada-37xx

This frequency was disabled because of unresolved stability problems.
However, based on several months of testing, the source of the
stability problems seems to be the bootloader, not the kernel.
Marvell has recently merged changes to their bootloader source that
addresses the stability issues when frequency scaling is enabled at
all frequencies including 1.2Ghz.

Signed-off-by: Benjamin Schneider <ben@...s.haus>
---
 drivers/cpufreq/armada-37xx-cpufreq.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/cpufreq/armada-37xx-cpufreq.c b/drivers/cpufreq/armada-37xx-cpufreq.c
index bea41ccab..f28a4435f 100644
--- a/drivers/cpufreq/armada-37xx-cpufreq.c
+++ b/drivers/cpufreq/armada-37xx-cpufreq.c
@@ -102,11 +102,7 @@ struct armada_37xx_dvfs {
 };
 
 static struct armada_37xx_dvfs armada_37xx_dvfs[] = {
-	/*
-	 * The cpufreq scaling for 1.2 GHz variant of the SOC is currently
-	 * unstable because we do not know how to configure it properly.
-	 */
-	/* {.cpu_freq_max = 1200*1000*1000, .divider = {1, 2, 4, 6} }, */
+	{.cpu_freq_max = 1200*1000*1000, .divider = {1, 2, 4, 6} },
 	{.cpu_freq_max = 1000*1000*1000, .divider = {1, 2, 4, 5} },
 	{.cpu_freq_max = 800*1000*1000,  .divider = {1, 2, 3, 4} },
 	{.cpu_freq_max = 600*1000*1000,  .divider = {2, 4, 5, 6} },
-- 
2.45.1