[PATCH v8 00/13] am62: IO+DDR resume support

[Kumar, Udit]

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) <msp at baylibre.com>
> ---
> 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-f113b156f83f@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-v6-0-6dd99a7271bb@baylibre.com
> [..]