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Message-Id: <20200416131329.471239529@linuxfoundation.org>
Date: Thu, 16 Apr 2020 15:21:19 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org,
Christoph Niedermaier <cniedermaier@...electronics.com>,
Viresh Kumar <viresh.kumar@...aro.org>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.5 028/257] cpufreq: imx6q: Fixes unwanted cpu overclocking on i.MX6ULL
From: Christoph Niedermaier <cniedermaier@...electronics.com>
[ Upstream commit 36eb7dc1bd42fe5f850329c893768ff89b696fba ]
imx6ul_opp_check_speed_grading is called for both i.MX6UL and i.MX6ULL.
Since the i.MX6ULL was introduced to a separate ocotp compatible node
later, it is possible that the i.MX6ULL has also dtbs with
"fsl,imx6ull-ocotp". On a system without nvmem-cell speed grade a
missing check on this node causes a driver fail without considering
the cpu speed grade.
This patch prevents unwanted cpu overclocking on i.MX6ULL with compatible
node "fsl,imx6ull-ocotp" in old dtbs without nvmem-cell speed grade.
Fixes: 2733fb0d0699 ("cpufreq: imx6q: read OCOTP through nvmem for imx6ul/imx6ull")
Signed-off-by: Christoph Niedermaier <cniedermaier@...electronics.com>
Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/cpufreq/imx6q-cpufreq.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/cpufreq/imx6q-cpufreq.c b/drivers/cpufreq/imx6q-cpufreq.c
index 648a09a1778a3..1fcbbd53a48a2 100644
--- a/drivers/cpufreq/imx6q-cpufreq.c
+++ b/drivers/cpufreq/imx6q-cpufreq.c
@@ -280,6 +280,9 @@ static int imx6ul_opp_check_speed_grading(struct device *dev)
void __iomem *base;
np = of_find_compatible_node(NULL, NULL, "fsl,imx6ul-ocotp");
+ if (!np)
+ np = of_find_compatible_node(NULL, NULL,
+ "fsl,imx6ull-ocotp");
if (!np)
return -ENOENT;
--
2.20.1
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