On 11/20/2025 9:33 PM, Markus Schneider-Pargmann (TI.com) wrote:
> This patch adds code to be able to call TI_SCI_MSG_MIN_CONTEXT_RESTORE.
> The context needs to be restored after booting SPL when resuming from
> IO+DDR.
>
> Tested-by: Anshul Dalal <anshuld at ti.com>
> Reviewed-by: Dhruva Gole <d-gole at ti.com>
> Signed-off-by: Markus Schneider-Pargmann (TI.com) <msp at baylibre.com>
> ---
> drivers/firmware/ti_sci.c | 38 ++++++++++++++++++++++++++++++++++
> drivers/firmware/ti_sci.h | 16 ++++++++++++++
> include/linux/soc/ti/ti_sci_protocol.h | 9 ++++++++
> 3 files changed, 63 insertions(+)
>
> diff --git a/drivers/firmware/ti_sci.c b/drivers/firmware/ti_sci.c
> index 6f57dcfe8de8f874318cd53372c798d182faae73..f1cb871e8f45013097f6f8188222770ffe3653dc 100644
> --- a/drivers/firmware/ti_sci.c
> +++ b/drivers/firmware/ti_sci.c
> @@ -2710,6 +2710,41 @@ static int ti_sci_cmd_change_fwl_owner(const struct ti_sci_handle *handle,
> return ret;
> }
>
> +static int ti_sci_cmd_restore_context(const struct ti_sci_handle *handle, u64 ctx_addr)
> +{
> + struct ti_sci_msg_min_restore_context_req req;
> + struct ti_sci_msg_hdr *resp;
> + struct ti_sci_info *info;
> + struct ti_sci_xfer *xfer;
> + int ret = 0;
> +
> + if (IS_ERR(handle))
> + return PTR_ERR(handle);
> + if (!handle)
> + return -EINVAL;
> +
> + info = handle_to_ti_sci_info(handle);
> +
> + xfer = ti_sci_setup_one_xfer(info, TI_SCI_MSG_MIN_CONTEXT_RESTORE,
function name should be ti_sci_cmd_restore_min_context or change
TI_SCI_MSG_MIN_CONTEXT_RESTORE
> + TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
> + (u32 *)&req, sizeof(req), sizeof(*resp));
> + if (IS_ERR(xfer)) {
> + ret = PTR_ERR(xfer);
> + return ret;
> + }
> +
> + req.ctx_lo = (u32)(ctx_addr & 0xffffffff);
> + req.ctx_hi = (u32)(ctx_addr >> 32);
> +
> + ret = ti_sci_do_xfer(info, xfer);
> + if (ret) {
> + dev_err(info->dev, "Failed restoring context %d\n", ret);
> + return ret;
> + }
> +
> + return ret;
> +}
> +
> /*
> * ti_sci_setup_ops() - Setup the operations structures
> * @info: pointer to TISCI pointer
> @@ -2728,6 +2763,7 @@ static void ti_sci_setup_ops(struct ti_sci_info *info)
> struct ti_sci_rm_psil_ops *psilops = &ops->rm_psil_ops;
> struct ti_sci_rm_udmap_ops *udmap_ops = &ops->rm_udmap_ops;
> struct ti_sci_fwl_ops *fwl_ops = &ops->fwl_ops;
> + struct ti_sci_lpm_ops *lpm_ops = &ops->lpm_ops;
>
> bops->board_config = ti_sci_cmd_set_board_config;
> bops->board_config_rm = ti_sci_cmd_set_board_config_rm;
> @@ -2795,6 +2831,8 @@ static void ti_sci_setup_ops(struct ti_sci_info *info)
>
> fw_ops->get_dm_version = ti_sci_cmd_get_dm_version;
> fw_ops->query_dm_cap = ti_sci_cmd_query_dm_cap;
> +
> + lpm_ops->restore_context = ti_sci_cmd_restore_context;
> }
>
> /**
> diff --git a/drivers/firmware/ti_sci.h b/drivers/firmware/ti_sci.h
> index ce50bf6800eb1fee70a872d8ae648b1a9582b681..3f8c27c7d8c5b35cc55c18ed33225e7b5262b3da 100644
> --- a/drivers/firmware/ti_sci.h
> +++ b/drivers/firmware/ti_sci.h
> @@ -45,6 +45,9 @@
> #define TI_SCI_MSG_QUERY_CLOCK_FREQ 0x010d
> #define TI_SCI_MSG_GET_CLOCK_FREQ 0x010e
>
> +/* Low Power Mode Requests */
> +#define TI_SCI_MSG_MIN_CONTEXT_RESTORE 0x0308
> +
> /* Processor Control Messages */
> #define TISCI_MSG_PROC_REQUEST 0xc000
> #define TISCI_MSG_PROC_RELEASE 0xc001
> @@ -1572,4 +1575,17 @@ struct ti_sci_msg_fwl_change_owner_info_resp {
> u16 owner_permission_bits;
> } __packed;
>
> +/**
> + * struct ti_sci_msg_min_restore_context_req - Request to restore context from DDR
> + *
> + * @hdr: Generic Header
> + * @ctx_lo Low 32-bits of physical pointer to address to use for context save.
> + * @ctx_hi High 32-bits of physical pointer to address to use for context save.
> + */
> +struct ti_sci_msg_min_restore_context_req {
> + struct ti_sci_msg_hdr hdr;
> + u32 ctx_lo;
> + u32 ctx_hi;
> +} __packed;
> +
> #endif /* __TI_SCI_H */
> diff --git a/include/linux/soc/ti/ti_sci_protocol.h b/include/linux/soc/ti/ti_sci_protocol.h
> index 52696763ecf6bc2336e796978e1cc02896db13ab..cb9798c8546617bcea9cc0f49f19c70e1e2c16f1 100644
> --- a/include/linux/soc/ti/ti_sci_protocol.h
> +++ b/include/linux/soc/ti/ti_sci_protocol.h
> @@ -632,6 +632,14 @@ struct ti_sci_fwl_ops {
> int (*change_fwl_owner)(const struct ti_sci_handle *handle, struct ti_sci_msg_fwl_owner *owner);
> };
>
> +/**
> + * struct ti_sci_lpm_ops - Low Power Mode operations
> + * @restore_context: Request restoring context from DDR.
> + */
> +struct ti_sci_lpm_ops {
> + int (*restore_context)(const struct ti_sci_handle *handle, u64 ctx_addr);
> +};
> +
> /**
> * struct ti_sci_ops - Function support for TI SCI
> * @board_ops: Miscellaneous operations
> @@ -654,6 +662,7 @@ struct ti_sci_ops {
> struct ti_sci_rm_psil_ops rm_psil_ops;
> struct ti_sci_rm_udmap_ops rm_udmap_ops;
> struct ti_sci_fwl_ops fwl_ops;
> + struct ti_sci_lpm_ops lpm_ops;
> };
>
> /**
>