nagai/kernel
3
0
Fork 0
forked from mirrors/linux
Code Pull requests Activity

cpufreq: imx6q: check speed grades for i.MX6ULL

Browse source 
Check the max speed supported from the fuses for i.MX6ULL and update the
operating points table accordingly.

Signed-off-by: Sébastien Szymanski <sebastien.szymanski@armadeus.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Tested-by: Stefan Agner <stefan@agner.ch>
Reviewed-by: Stefan Agner <stefan@agner.ch>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Acked-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Sébastien Szymanski 2018-05-22 08:28:51 +02:00 committed by Rafael J. Wysocki
parent 7592019634
commit 0aa9abd4c2
1 changed files with 23 additions and 6 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

29
drivers/cpufreq/imx6q-cpufreq.c
View file

@ -266,6 +266,8 @@ static void imx6q_opp_check_speed_grading(struct device *dev)
}
#define OCOTP_CFG3_6UL_SPEED_696MHZ 0x2
#define OCOTP_CFG3_6ULL_SPEED_792MHZ 0x2
#define OCOTP_CFG3_6ULL_SPEED_900MHZ 0x3
static void imx6ul_opp_check_speed_grading(struct device *dev)
{
@ -287,16 +289,30 @@ static void imx6ul_opp_check_speed_grading(struct device *dev)
* Speed GRADING[1:0] defines the max speed of ARM:
* 2b'00: Reserved;
* 2b'01: 528000000Hz;
* 2b'10: 696000000Hz;
* 2b'11: Reserved;
* 2b'10: 696000000Hz on i.MX6UL, 792000000Hz on i.MX6ULL;
* 2b'11: 900000000Hz on i.MX6ULL only;
* We need to set the max speed of ARM according to fuse map.
*/
val = readl_relaxed(base + OCOTP_CFG3);
val >>= OCOTP_CFG3_SPEED_SHIFT;
val &= 0x3;
if (val != OCOTP_CFG3_6UL_SPEED_696MHZ)
if (dev_pm_opp_disable(dev, 696000000))
dev_warn(dev, "failed to disable 696MHz OPP\n");
if (of_machine_is_compatible("fsl,imx6ul")) {
if (val != OCOTP_CFG3_6UL_SPEED_696MHZ)
if (dev_pm_opp_disable(dev, 696000000))
dev_warn(dev, "failed to disable 696MHz OPP\n");
}
if (of_machine_is_compatible("fsl,imx6ull")) {
if (val != OCOTP_CFG3_6ULL_SPEED_792MHZ)
if (dev_pm_opp_disable(dev, 792000000))
dev_warn(dev, "failed to disable 792MHz OPP\n");
if (val != OCOTP_CFG3_6ULL_SPEED_900MHZ)
if (dev_pm_opp_disable(dev, 900000000))
dev_warn(dev, "failed to disable 900MHz OPP\n");
}
iounmap(base);
put_node:
of_node_put(np);
@ -356,7 +372,8 @@ static int imx6q_cpufreq_probe(struct platform_device *pdev)
goto put_reg;
}
if (of_machine_is_compatible("fsl,imx6ul"))
if (of_machine_is_compatible("fsl,imx6ul") ||
of_machine_is_compatible("fsl,imx6ull"))
imx6ul_opp_check_speed_grading(cpu_dev);
else
imx6q_opp_check_speed_grading(cpu_dev);