[U-Boot] [PATCH v2 2/2] mx: mx6: display max cpu frequency in print_cpuinfo()

Tim Harvey
2015-05-14T05:08:41Z

Display the max CPU frequency as well as the current running CPU frequency
if the max CPU frequency is available and differs from the current CPU
frequency.

Before:
CPU: Freescale i.MX6Q rev1.2 at 792 MHz

After - using an 800MHz IMX6DL (running at its max)
CPU: Freescale i.MX6DL rev1.1 at 792 MHz

After - using a 1GHz IMX6Q (not running at its max):
CPU: Freescale i.MX6Q rev1.2 996 MHz (running at 792 MHz)

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
---
v2:
- split out from patch that obtains the max cpu freq
- add before/after example and more description of change

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
---
arch/arm/imx-common/cpu.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/arch/arm/imx-common/cpu.c b/arch/arm/imx-common/cpu.c
index 067d08f..6b20482 100644
--- a/arch/arm/imx-common/cpu.c
+++ b/arch/arm/imx-common/cpu.c
@@ -142,7 +142,7 @@ const char *get_imx_type(u32 imxtype)

int print_cpuinfo(void)
{
- u32 cpurev;
+ u32 cpurev, max_freq;

#if defined(CONFIG_MX6) && defined(CONFIG_IMX6_THERMAL)
struct udevice *thermal_dev;
@@ -151,11 +151,25 @@ int print_cpuinfo(void)

cpurev = get_cpu_rev();

+#if defined(CONFIG_MX6)
+ printf("CPU: Freescale i.MX%s rev%d.%d",
+ get_imx_type((cpurev & 0xFF000) >> 12),
+ (cpurev & 0x000F0) >> 4,
+ (cpurev & 0x0000F) >> 0);
+ max_freq = get_cpu_speed_grade_hz();
+ if (!max_freq || max_freq == mxc_get_clock(MXC_ARM_CLK)) {
+ printf(" at %dMHz\n", mxc_get_clock(MXC_ARM_CLK) / 1000000);
+ } else {
+ printf(" %d MHz (running at %d MHz)\n", max_freq / 1000000,
+ mxc_get_clock(MXC_ARM_CLK) / 1000000);
+ }
+#else
printf("CPU: Freescale i.MX%s rev%d.%d at %d MHz\n",
get_imx_type((cpurev & 0xFF000) >> 12),
(cpurev & 0x000F0) >> 4,
(cpurev & 0x0000F) >> 0,
mxc_get_clock(MXC_ARM_CLK) / 1000000);
+#endif

#if defined(CONFIG_MX6) && defined(CONFIG_IMX6_THERMAL)
ret = uclass_get_device(UCLASS_THERMAL, 0, &thermal_dev);
--
1.9.1