This is a note to let you know that I've just added the patch titled
cpufreq: imx6q: Don't disable 792 Mhz OPP unnecessarily
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
cpufreq-imx6q-don-t-disable-792-mhz-opp-unnecessaril.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit c70addde7e833810346c4564480e65c111f8a851
Author: Christoph Niedermaier <cniedermaier@xxxxxxxxxxxxxxxxxx>
Date: Wed Nov 22 14:41:13 2023 +0100
cpufreq: imx6q: Don't disable 792 Mhz OPP unnecessarily
[ Upstream commit 2e4e0984c7d696cc74cf2fd7e7f62997f0e9ebe6 ]
For a 900MHz i.MX6ULL CPU the 792MHz OPP is disabled. There is no
convincing reason to disable this OPP. If a CPU can run at 900MHz,
it should also be able to cope with 792MHz. Looking at the voltage
level of 792MHz in [1] (page 24, table 10. "Operating Ranges") the
current defined OPP is above the minimum. So the voltage level
shouldn't be a problem. However in [2] (page 24, table 10.
"Operating Ranges"), it is not mentioned that 792MHz OPP isn't
allowed. Change it to only disable 792MHz OPP for i.MX6ULL types
below 792 MHz.
[1] https://www.nxp.com/docs/en/data-sheet/IMX6ULLIEC.pdf
[2] https://www.nxp.com/docs/en/data-sheet/IMX6ULLCEC.pdf
Fixes: 0aa9abd4c212 ("cpufreq: imx6q: check speed grades for i.MX6ULL")
Signed-off-by: Christoph Niedermaier <cniedermaier@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Marek Vasut <marex@xxxxxxx>
Reviewed-by: Fabio Estevam <festevam@xxxxxxx>
[ Viresh: Edited subject ]
Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/cpufreq/imx6q-cpufreq.c b/drivers/cpufreq/imx6q-cpufreq.c
index 1a4ea82e4c172..b3a392b4c9282 100644
--- a/drivers/cpufreq/imx6q-cpufreq.c
+++ b/drivers/cpufreq/imx6q-cpufreq.c
@@ -349,7 +349,7 @@ static int imx6ul_opp_check_speed_grading(struct device *dev)
imx6x_disable_freq_in_opp(dev, 696000000);
if (of_machine_is_compatible("fsl,imx6ull")) {
- if (val != OCOTP_CFG3_6ULL_SPEED_792MHZ)
+ if (val < OCOTP_CFG3_6ULL_SPEED_792MHZ)
imx6x_disable_freq_in_opp(dev, 792000000);
if (val != OCOTP_CFG3_6ULL_SPEED_900MHZ)
