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Message-Id: <20201104234427.26477-10-digetx@gmail.com>
Date: Thu, 5 Nov 2020 02:44:06 +0300
From: Dmitry Osipenko <digetx@...il.com>
To: Thierry Reding <thierry.reding@...il.com>,
Jonathan Hunter <jonathanh@...dia.com>,
Alan Stern <stern@...land.harvard.edu>,
Peter Chen <Peter.Chen@....com>,
Mark Brown <broonie@...nel.org>,
Liam Girdwood <lgirdwood@...il.com>,
Adrian Hunter <adrian.hunter@...el.com>,
Krzysztof Kozlowski <krzk@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Lee Jones <lee.jones@...aro.org>,
Uwe Kleine-König
<u.kleine-koenig@...gutronix.de>,
Ulf Hansson <ulf.hansson@...aro.org>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Marek Szyprowski <m.szyprowski@...sung.com>,
Peter Geis <pgwipeout@...il.com>,
Nicolas Chauvet <kwizart@...il.com>
Cc: linux-samsung-soc@...r.kernel.org, devel@...verdev.osuosl.org,
linux-usb@...r.kernel.org, linux-pwm@...r.kernel.org,
linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org,
linux-media@...r.kernel.org, linux-tegra@...r.kernel.org
Subject: [PATCH v1 09/30] soc/tegra: regulators: Fix lockup when voltage-spread is out of range
Fix voltage coupler lockup which happens when voltage-spread is out
of range due to a bug in the code. The max-spread requirement shall be
accounted when CPU regulator doesn't have consumers. This problem is
observed on Tegra30 Ouya game console once system-wide DVFS is enabled
in a device-tree.
Fixes: 783807436f36 ("soc/tegra: regulators: Add regulators coupler for Tegra30")
Cc: stable@...r.kernel.org
Tested-by: Peter Geis <pgwipeout@...il.com>
Reported-by: Peter Geis <pgwipeout@...il.com>
Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
drivers/soc/tegra/regulators-tegra30.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/soc/tegra/regulators-tegra30.c b/drivers/soc/tegra/regulators-tegra30.c
index f7a5260edffe..fcf824f73131 100644
--- a/drivers/soc/tegra/regulators-tegra30.c
+++ b/drivers/soc/tegra/regulators-tegra30.c
@@ -198,7 +198,7 @@ static int tegra30_voltage_update(struct tegra_regulator_coupler *tegra,
* survive the voltage drop if it's running on a higher frequency.
*/
if (!cpu_min_uV_consumers)
- cpu_min_uV = cpu_uV;
+ cpu_min_uV = max(cpu_uV, cpu_min_uV);
/*
* Bootloader shall set up voltages correctly, but if it
--
2.27.0
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