How to put TWL/TPS into sleep?
Hi all,
I'm trying to achieve maximal power savings on omap3 based system with TPS65930 PMIC using twl4030_script and twl4030_resconfig. I've tried different resource mappings and different command sequences in the sleep/wakeup scripts by to no avail. Moreover, with some resource definitions and sleep/wakeup scripts the system behaves in a weird ways, e.g. does not properly respond to hard resets.
Most probably my resource remapping and command sequences are wrong and this is the reason for system misbehavior.
However, several things are completely unclear to me:
* Does TPS/TWL have defaults for sleep-on and sleep-off transitions?
* What would happen if nSLEEP1 would go low/high and there is no sleep/wakeup sequence programmed?
* If I have a sleep sequence that disables some power resources, what would be the state of the other resources?
I've read the TPS TRM several times to now and I still got now clue about what's going on there :(
Signature · 2 lines
Sincerely yours, Mike.
Hi Mike,
----- Original Message ----- From: "Mike Rapoport" <[email protected]>
To: <[email protected]>
Sent: Thursday, January 21, 2010 5:15 PM
Subject: How to put TWL/TPS into sleep?
Quoted 10 lines
Hi all,
I'm trying to achieve maximal power savings on omap3 based system with TPS65930 PMIC usingtwl4030_scriptandtwl4030_resconfig. I've tried different resource mappings and different command sequences in the sleep/wakeup scripts by to no avail. Moreover, with some resource definitions and sleep/wakeup scripts the system behaves in a weird ways, e.g. does not properly respond to hard resets.
Most probably my resource remapping and command sequences are wrong and this is the reason for system misbehavior.
Quoted 2 lines
However, several things are completely unclear to me:
* Does TPS/TWL have defaults for sleep-on and sleep-off transitions?
AFIK TPS659x & TWL4030 is same chip, may have some Si version(ES 1.x) difference. So the power seqeunce used on TWL4030, should work on TPS659x also.
Quoted 2 lines
* What would happen if nSLEEP1 would go low/high and there is no sleep/wakeup sequence programmed?
By default reset value for the resgister pointing to [sleep/wakeup/wrst] seq is 0x3F, which is the exit addr for seq. So the TRITON resources will not have any change.
Quoted 2 lines
* If I have a sleep sequence that disables some power resources, what would be the state of the other resources?
If you are using singular messages in the seq, you can address each resource by specifying the Resource_id. But if you are using broadcast messages, the resources which will respond depends on the Resource_group, TYPE & TYPE2 values.
Quoted 3 lines
I've read the TPS TRM several times to now and I still got now clue about what's going on there :(
You can verify wether your clk/volt setup_time holds good.
Quoted 10 lines
Signature · 7 lines
-- Sincerely yours, Mike. -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
Quoted 39 lines · Lesly AM
Hi Mike,
----- Original Message ----- From: "Mike Rapoport" <[email protected]>
To: <[email protected]>
Sent: Thursday, January 21, 2010 5:15 PM
Subject: How to put TWL/TPS into sleep?Quoted 10 lines
Hi all,
I'm trying to achieve maximal power savings on omap3 based system with TPS65930 PMIC usingtwl4030_scriptandtwl4030_resconfig. I've tried different resource mappings and different command sequences in the sleep/wakeup scripts by to no avail. Moreover, with some resource definitions and sleep/wakeup scripts the system behaves in a weird ways, e.g. does not properly respond to hard resets.
Most probably my resource remapping and command sequences are wrong and this is the reason for system misbehavior.Quoted 2 lines
However, several things are completely unclear to me:
* Does TPS/TWL have defaults for sleep-on and sleep-off transitions?AFIK TPS659x & TWL4030 is same chip, may have some Si version(ES 1.x) difference.
So the power seqeunce used on TWL4030, should work on TPS659x also.Quoted 2 lines
* What would happen if nSLEEP1 would go low/high and there is no sleep/wakeup sequence programmed?
By default reset value for the resgister pointing to [sleep/wakeup/wrst] seq is
0x3F, which is the exit addr for seq.
So the TRITON resources will not have any change.Quoted 2 lines
* If I have a sleep sequence that disables some power resources, what would be the state of the other resources?
If you are using singular messages in the seq, you can address each resource by specifying the
Resource_id.
But if you are using broadcast messages, the resources which will respond depends on theResource_group, TYPE & TYPE2 values.Quoted 1 line
Quoted 3 lines
Quoted 2 lines
I've read the TPS TRM several times to now and I still got now clue about what's going on there :(
You can verify wether your clk/volt
setup_timeholds good.
Thanks a lot. This is really helpful :)
Quoted 11 lines
Quoted 10 lines
Signature · 7 lines
-- Sincerely yours, Mike. -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
Signature · 2 lines
Sincerely yours, Mike.