Hi Markus,
On 12/23/2025 1:31 AM, Markus Schneider-Pargmann (TI.com) wrote:
Hi,
this series introduces support to resume from IO+DDR. IO+DDR is a low
power mode of am62a and am62p in which nearly everything is powered off
except DDR which is in self-refresh and a few pins which detect
activity and can wakeup the system again.
On resume uboot SPL is loaded and checks if this is a IO+DDR resume. If
it is, the DDR initialization sequence in k3-ddrss differs slightly as
it has to get the DDR out of the self-refresh.
Afterward a specific address determined from DT is used to get the
metadata that stores relevant context addresses. The context is restored
using the tisci message TI_SCI_MSG_MIN_CONTEXT_RESTORE. At the end all
further initializations are skipped and uboot SPL directly jumps into
the DM resume address which takes care of the rest.
k3-ddrss is using absolute register accesses at the moment. I am trying
to submit syscon DT patches upstream to access these through syscon,
unfortunately there is ongoing discussion regarding syscon.
I tested this on am62a.
Best,
Markus
Signed-off-by: Markus Schneider-Pargmann (TI.com) <[email protected]>
---
Changes in v8:
- Create and use am62xx-lpm-common for am62xx lpm common functions
- Create platform dependent functions in k3-ddrss in k3_ddrss_data
- Align am62a and am62p initialization regarding caches and QoS
- Link to v7:
https://lore.kernel.org/r/20251210-topic-am62-ioddr-v2025-04-rc1-v7-0-f113b156f...@baylibre.com
Thanks for clean up ,
Apart from qos comments on patch 8/13 and 9/13, overall series looks
good to me.
Changes in v7:
- Removed parent nodes bootph-pre-ram properties as not necessary
anymore.
- Added missing new line in
arm: mach-k3: common: Helper for LPM meta data address from DT
- Split off LPM specific ddr code into its own file k3-ddrss-lpm
- Rename lpm_ops->restore_context to lpm_ops->min_context_restore
- Pulled patch to add wakeup check helpers before the IO isolation
removal to remove later cleanup of
wkup_ctrl_remove_can_io_isolation_if_set()
- Some reviewed-bys and tested-bys removed due to changes in the
patches
- Link to v6:
https://lore.kernel.org/r/20251120-topic-am62-ioddr-v2025-04-rc1-v6-0-6dd99a727...@baylibre.com
[..]
