OMAP4470 + TPS62361, how to set the vdd_mpu ?

chaotian jing

Other Parts Discussed in Thread: TWL6030, TWL6032, 4460

Hi All,

I need some help on my panda board features 4470 + tps62361 + twl6030.

the VDD_CORE and VDD_IVA are supplied by twl6030, and the VDD_MPU is supplied by tps62361.

but the board is not stable, it will stuck sometimes, when stuck, the LCD is still on, but the cpu already hang, about 10 seconds, the board restart itself.

Now we can sure that it is caused by the voltage of VDD_MPU, I tried to improve the voltage of it like below, and disable the SmartReflex to do calibate

diff --git a/arch/arm/mach-omap2/opp4xxx_data.c b/arch/arm/mach-omap2/opp4xxx_data.c
index 8bebfca..642309f 100644
--- a/arch/arm/mach-omap2/opp4xxx_data.c
+++ b/arch/arm/mach-omap2/opp4xxx_data.c
@@ -358,6 +358,7 @@ static struct omap_opp_def __initdata omap446x_opp_def_list[] = {
* Structures containing OMAP4470 voltage supported and various
* voltage dependent data for each VDD.
*/
+#if 0
#define OMAP4470_VDD_MPU_OPP50_UV 1025000
#define OMAP4470_VDD_MPU_OPP100_UV 1200000
#define OMAP4470_VDD_MPU_OPPTURBO_UV 1312000
@@ -365,13 +366,29 @@ static struct omap_opp_def __initdata omap446x_opp_def_list[] = {
#define OMAP4470_VDD_MPU_OPPNITROSB_UV 1380000

struct omap_volt_data omap447x_vdd_mpu_volt_data[] = {
- VOLT_DATA_DEFINE(OMAP4470_VDD_MPU_OPP50_UV, 0, OMAP44XX_CONTROL_FUSE_MPU_OPP50, 0xf4, 0x0c, OMAP_ABB_NOMINAL_OPP),
- VOLT_DATA_DEFINE(OMAP4470_VDD_MPU_OPP100_UV, 0, OMAP44XX_CONTROL_FUSE_MPU_OPP100, 0xf9, 0x16, OMAP_ABB_NOMINAL_OPP),
- VOLT_DATA_DEFINE(OMAP4470_VDD_MPU_OPPTURBO_UV, 0, OMAP44XX_CONTROL_FUSE_MPU_OPPTURBO, 0xfa, 0x23, OMAP_ABB_NOMINAL_OPP),
- VOLT_DATA_DEFINE(OMAP4470_VDD_MPU_OPPNITRO_UV, 0, OMAP44XX_CONTROL_FUSE_MPU_OPPNITRO, 0xfa, 0x27, OMAP_ABB_FAST_OPP),
+ VOLT_DATA_DEFINE(OMAP4470_VDD_MPU_OPP50_UV, 90000, OMAP44XX_CONTROL_FUSE_MPU_OPP50, 0xf4, 0x0c, OMAP_ABB_NOMINAL_OPP),
+ VOLT_DATA_DEFINE(OMAP4470_VDD_MPU_OPP100_UV, 60000, OMAP44XX_CONTROL_FUSE_MPU_OPP100, 0xf9, 0x16, OMAP_ABB_NOMINAL_OPP),
+ VOLT_DATA_DEFINE(OMAP4470_VDD_MPU_OPPTURBO_UV, 30000, OMAP44XX_CONTROL_FUSE_MPU_OPPTURBO, 0xfa, 0x23, OMAP_ABB_NOMINAL_OPP),
+ VOLT_DATA_DEFINE(OMAP4470_VDD_MPU_OPPNITRO_UV, 30000, OMAP44XX_CONTROL_FUSE_MPU_OPPNITRO, 0xfa, 0x27, OMAP_ABB_FAST_OPP),
VOLT_DATA_DEFINE(OMAP4470_VDD_MPU_OPPNITROSB_UV, 30000, OMAP44XX_CONTROL_FUSE_MPU_OPPNITROSB, 0xfa, 0x27, OMAP_ABB_FAST_OPP),
VOLT_DATA_DEFINE(0, 0, 0, 0, 0, 0),
};
+#else
+#define OMAP4470_VDD_MPU_OPP50_UV 1040000
+#define OMAP4470_VDD_MPU_OPP100_UV 1100000
+#define OMAP4470_VDD_MPU_OPPTURBO_UV 1170000
+#define OMAP4470_VDD_MPU_OPPNITRO_UV 1310000
+#define OMAP4470_VDD_MPU_OPPNITROSB_UV 1410000
+
+struct omap_volt_data omap447x_vdd_mpu_volt_data[] = {
+ VOLT_DATA_DEFINE(OMAP4470_VDD_MPU_OPP50_UV, 1, OMAP44XX_CONTROL_FUSE_MPU_OPP50, 0xf4, 0x0c, OMAP_ABB_NOMINAL_OPP),
+ VOLT_DATA_DEFINE(OMAP4470_VDD_MPU_OPP100_UV, 1, OMAP44XX_CONTROL_FUSE_MPU_OPP100, 0xf9, 0x16, OMAP_ABB_NOMINAL_OPP),
+ VOLT_DATA_DEFINE(OMAP4470_VDD_MPU_OPPTURBO_UV, 1, OMAP44XX_CONTROL_FUSE_MPU_OPPTURBO, 0xfa, 0x23, OMAP_ABB_NOMINAL_OPP),
+ VOLT_DATA_DEFINE(OMAP4470_VDD_MPU_OPPNITRO_UV, 1, OMAP44XX_CONTROL_FUSE_MPU_OPPNITRO, 0xfa, 0x27, OMAP_ABB_FAST_OPP),
+ VOLT_DATA_DEFINE(OMAP4470_VDD_MPU_OPPNITROSB_UV, 1, OMAP44XX_CONTROL_FUSE_MPU_OPPNITROSB, 0xfa, 0x27, OMAP_ABB_FAST_OPP),

Now the board can work more stable, but still stuck. specially when browsering the website. our WIFI chip is WL128X.

So, does anyone can give me some suggestion about this issue ?

thanks for your any reply!

over 13 years ago

0 Venkat Ramana Peddigari over 13 years ago

TI__Expert 4120 points

Hi Chaotian ,

The system can become unstable at higher OPP's which overdrive voltages such as Nitro and NitroSB if the SmartReflex is disabled.

Do you see that the system gets stuck when it goes to higher OPP?

Thanks & Best Regards,

Venkat

0 Israel Cepeda over 13 years ago

TI__Expert 5515 points

Pandaboard uses OMAP4430 and Pandaboard ES an OMAP4460, where did you get one with OMAP4470?

0 chaotian jing over 13 years ago in reply to Venkat Ramana Peddigari

Prodigy 60 points

Thanks for your reply!

I cannot sure at which OPP when the system stuck, I tried to print out current voltage every 10ms, but this period is too long.

SmartReflex is enabled. I tried to disable the SmartReflex, but still stuck. So, the issue appears when regulate the mpu frequency.

If I locked the frequency, then the system was stable.

I tried to disable 1.5Ghz yesterday, then the highest frequency is 1.3Ghz, but still not stable!

Thanks

0 chaotian jing over 13 years ago in reply to Israel Cepeda

Prodigy 60 points

sorry for my mistake. this board is not panda board but similar.

when work with omap4430 or omap4460, the system is very stable. but "MPU" voltage is supplied by twl6030, not tps62361.

Does the combination "4470 + 62361" cannot work stable ? and must with twl6032 ?

Thanks

0 Alex Trinh over 13 years ago in reply to chaotian jing

TI__Intellectual 815 points

Hello,

What frequency did you lock the MPU at?

twl6032 is the recommended pmic to use with the 4470. Using TPS62361 to power 4460's MPU is stable, but sometimes not enough to properly drive the 4470's MPU under corner cases, as you have seen. OMAP development processor boards use 4470 + twl6032.

Regards,
Alex

0 chaotian jing over 13 years ago in reply to Alex Trinh

Prodigy 60 points

Thanks for your reply.

I locked the frequency at 1.5Ghz, or other frequency, like 1.3Ghz or 1.1Ghz, To do this just disable the regulation of frequency.

Now what confused me is that if I improve the voltages of each frequency, the the system is more stable, but still cannot avoid the system getting stuck.

I want to know what happened when the system gets stuck, when regulate frequency, first increase the voltage and then set the corresponding frequency.

does the current is not enough or the TPS62361 cannot supply the voltage specified sometimes ?

Thanks.

0 Alex Trinh over 13 years ago in reply to chaotian jing

TI__Intellectual 815 points

The current is sometimes not enough if using twl6030 or TPS62361 to drive the 4470 MPU.

Regards,

Alex

0 chaotian jing over 13 years ago in reply to Alex Trinh

Prodigy 60 points

Thanks,

That means that I must change the omap4470 back to omap4460.

thanks

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OMAP4470 + TPS62361, how to set the vdd_mpu ?