[U-Boot] [PATCH v3 2/2] imx: mx6: display max cpu frequency in print_cpuinfo()

Tim Harvey tharvey at gateworks.com
Mon May 18 16:02:25 CEST 2015


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)

Cc: Stefan Roese <sr at denx.de>
Cc: Eric Nelson <eric.nelson at boundarydevices.com>
Cc: Heiko Schocher <hs at denx.de>
Cc: Nikita Kiryanov <nikita at compulab.co.il>
Cc: Jon Nettleton <jon.nettleton at gmail.com>
Cc: Jason Liu <r64343 at freescale.com>
Cc: Ye Li <b37916 at freescale.com>
Cc: Fabio Estevam <fabio.estevam at freescale.com>
Cc: Christian Gmeiner <christian.gmeiner at gmail.com>
Cc: Markus Niebel <Markus.Niebel at tq-group.com>
Cc: Peng Fan <b51431 at freescale.com>
Tested-by: Nikolay Dimitrov <picmaster at mail.bg>
Signed-off-by: Tim Harvey <tharvey at gateworks.com>
---
v3:
 - fix commit message (mx: mx6 -> imx: mx6)
 - added Nikolay's tested by
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 at gateworks.com>
v2:
---
 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



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