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imx8qxp: Fix the reported CPU frequency

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Currently the CPU frequency is incorrectly reported:

CPU:   NXP i.MX8QXP RevB A35 at 147228 MHz

Fix this problem by using a direct call to the SCU firmware to
retrieve the Cortex A35 CPU frequency.

With this change applied the CPU frequency is displayed correctly:

CPU:   NXP i.MX8QXP RevB A35 at 1200 MHz

Tested-by: Marcelo Macedo <marcelo.macedo@nxp.com>
Signed-off-by: Fabio Estevam <festevam@gmail.com>
Tested-by: Andrejs Cainikovs <andrejs.cainikovs@netmodule.com>
This commit is contained in:
Fabio Estevam 2019-02-05 10:43:26 -02:00 committed by Stefano Babic
parent f6c3a9136b
commit 75cd09cb18
1 changed files with 16 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
arch/arm/mach-imx/imx8/cpu.c
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@ -616,26 +616,32 @@ static const struct udevice_id cpu_imx8_ids[] = {
{ }
};
static ulong imx8_get_cpu_rate(void)
{
ulong rate;
int ret;
ret = sc_pm_get_clock_rate(-1, SC_R_A35, SC_PM_CLK_CPU,
(sc_pm_clock_rate_t *)&rate);
if (ret) {
printf("Could not read CPU frequency: %d\n", ret);
return 0;
}
return rate;
}
static int imx8_cpu_probe(struct udevice *dev)
{
struct cpu_imx_platdata *plat = dev_get_platdata(dev);
struct clk cpu_clk;
u32 cpurev;
int ret;
cpurev = get_cpu_rev();
plat->cpurev = cpurev;
plat->name = get_core_name();
plat->rev = get_imx8_rev(cpurev & 0xFFF);
plat->type = get_imx8_type((cpurev & 0xFF000) >> 12);
ret = clk_get_by_index(dev, 0, &cpu_clk);
if (ret) {
debug("%s: Failed to get CPU clk: %d\n", __func__, ret);
return 0;
}
plat->freq_mhz = clk_get_rate(&cpu_clk) / 1000000;
plat->freq_mhz = imx8_get_cpu_rate() / 1000000;
return 0;
}