[PATCH ath-next] wifi: ath12k: add QMI capability negotiation for dynamic memory mode

[Rameshkumar Sundaram]

On 6/1/2026 8:48 AM, Aaradhana Sahu wrote:
> On AHB platforms, firmware operates in two modes: fixed-memory mode where
> firmware uses hardcoded addresses for memory regions such as BDF and does
> not request HOST_DDR memory from the host, and dynamic-memory mode where
> firmware expects the host to provide memory addresses including HOST_DDR
> after the Q6 read-only region and relies on host allocation for all memory
> types.
> 
> Introduce QMI capability negotiation to support both modes. Add a new QMI
> PHY capability flag dynamic_ddr_support which is advertised by firmware to
> indicate it supports dynamic memory mode. When the host detects this
> capability, set the dynamic_mem_support flag in the host capability message
> to signal the host is ready to provide dynamic memory allocation. This
> triggers firmware to send the HOST_DDR memory request and use the
> host-provided address.
> 
> For backward compatibility, if firmware doesn't advertise
> dynamic_ddr_support, the firmware continues to operate in fixed-memory mode
> where firmware uses predefined addresses.
> 
> Tested-on: IPQ5332 hw1.0 AHB WLAN.WBE.1.6-01275-QCAHKSWPL_SILICONZ-1
> 
> Signed-off-by: Aaradhana Sahu <aaradhana.sahu at oss.qualcomm.com>
> ---
>   drivers/net/wireless/ath/ath12k/qmi.c | 50 +++++++++++++++++++++++++--
>   drivers/net/wireless/ath/ath12k/qmi.h | 10 ++++--
>   2 files changed, 54 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/wireless/ath/ath12k/qmi.c b/drivers/net/wireless/ath/ath12k/qmi.c
> index fd762b5d7bb5..85406d6e6da1 100644
> --- a/drivers/net/wireless/ath/ath12k/qmi.c
> +++ b/drivers/net/wireless/ath/ath12k/qmi.c
> @@ -506,6 +506,24 @@ static const struct qmi_elem_info qmi_wlanfw_host_cap_req_msg_v01_ei[] = {
>   		.offset		= offsetof(struct qmi_wlanfw_host_cap_req_msg_v01,
>   					   feature_list),
>   	},
> +	{
> +		.data_type	= QMI_OPT_FLAG,
> +		.elem_len	= 1,
> +		.elem_size	= sizeof(u8),
> +		.array_type	= NO_ARRAY,
> +		.tlv_type	= 0x33,
> +		.offset		= offsetof(struct qmi_wlanfw_host_cap_req_msg_v01,
> +					   dynamic_mem_support_valid),
> +	},
> +	{
> +		.data_type	= QMI_UNSIGNED_1_BYTE,
> +		.elem_len	= 1,
> +		.elem_size	= sizeof(u8),
> +		.array_type	= NO_ARRAY,
> +		.tlv_type	= 0x33,
> +		.offset		= offsetof(struct qmi_wlanfw_host_cap_req_msg_v01,
> +					   dynamic_mem_support),
> +	},
>   	{
>   		.data_type	= QMI_EOTI,
>   		.array_type	= NO_ARRAY,
> @@ -602,6 +620,24 @@ static const struct qmi_elem_info qmi_wlanfw_phy_cap_resp_msg_v01_ei[] = {
>   		.offset         = offsetof(struct qmi_wlanfw_phy_cap_resp_msg_v01,
>   					   single_chip_mlo_support),
>   	},
> +	{
> +		.data_type      = QMI_OPT_FLAG,
> +		.elem_len       = 1,
> +		.elem_size      = sizeof(u8),
> +		.array_type     = NO_ARRAY,
> +		.tlv_type       = 0x17,
> +		.offset         = offsetof(struct qmi_wlanfw_phy_cap_resp_msg_v01,
> +					   dynamic_ddr_support_valid),
> +	},
> +	{
> +		.data_type      = QMI_UNSIGNED_1_BYTE,
> +		.elem_len       = 1,
> +		.elem_size      = sizeof(u8),
> +		.array_type     = NO_ARRAY,
> +		.tlv_type       = 0x17,
> +		.offset         = offsetof(struct qmi_wlanfw_phy_cap_resp_msg_v01,
> +					   dynamic_ddr_support),
> +	},
>   	{
>   		.data_type	= QMI_EOTI,
>   		.array_type	= NO_ARRAY,
> @@ -2248,6 +2284,11 @@ int ath12k_qmi_host_cap_send(struct ath12k_base *ab)
>   	if (ret < 0)
>   		goto out;
>   
> +	if (ab->qmi.dynamic_ddr_support) {
> +		req.dynamic_mem_support_valid = 1;
> +		req.dynamic_mem_support = 1;
> +	}
> +
>   	ret = qmi_txn_init(&ab->qmi.handle, &txn,
>   			   qmi_wlanfw_host_cap_resp_msg_v01_ei, &resp);
>   	if (ret < 0)
> @@ -2319,11 +2360,14 @@ static void ath12k_qmi_phy_cap_send(struct ath12k_base *ab)
>   
>   	ab->qmi.num_radios = resp.num_phy;
>   
> +	if (resp.dynamic_ddr_support_valid)
> +		ab->qmi.dynamic_ddr_support = resp.dynamic_ddr_support;
> +
>   	ath12k_dbg(ab, ATH12K_DBG_QMI,
> -		   "phy capability resp valid %d single_chip_mlo_support %d valid %d num_phy %d valid %d board_id %d\n",
> +		   "phy capability resp valid %d single_chip_mlo_support %d valid %d num_phy %d valid %d board_id %d dynamic_ddr_valid %d dynamic_ddr_support %d\n",
>   		   resp.single_chip_mlo_support_valid, resp.single_chip_mlo_support,
> -		   resp.num_phy_valid, resp.num_phy,
> -		   resp.board_id_valid, resp.board_id);
> +		   resp.num_phy_valid, resp.num_phy, resp.board_id_valid, resp.board_id,
> +		   resp.dynamic_ddr_support_valid, resp.dynamic_ddr_support);
>   
>   	return;
>   
> diff --git a/drivers/net/wireless/ath/ath12k/qmi.h b/drivers/net/wireless/ath/ath12k/qmi.h
> index 2a63e214eb42..dbde76e5a78d 100644
> --- a/drivers/net/wireless/ath/ath12k/qmi.h
> +++ b/drivers/net/wireless/ath/ath12k/qmi.h
> @@ -156,9 +156,10 @@ struct ath12k_qmi {
>   	struct m3_mem_region aux_uc_mem;
>   	unsigned int service_ins_id;
>   	struct dev_mem_info dev_mem[ATH12K_QMI_WLFW_MAX_DEV_MEM_NUM_V01];
> +	u8 dynamic_ddr_support;
>   };
>   
> -#define QMI_WLANFW_HOST_CAP_REQ_MSG_V01_MAX_LEN		261
> +#define QMI_WLANFW_HOST_CAP_REQ_MSG_V01_MAX_LEN		265
>   #define QMI_WLANFW_HOST_CAP_REQ_V01			0x0034
>   #define QMI_WLANFW_HOST_CAP_RESP_MSG_V01_MAX_LEN	7
>   #define QMI_WLFW_HOST_CAP_RESP_V01			0x0034
> @@ -258,7 +259,8 @@ struct qmi_wlanfw_host_cap_req_msg_v01 {
>   	struct wlfw_host_mlo_chip_info_s_v01 mlo_chip_info[QMI_WLFW_MAX_NUM_MLO_CHIPS_V01];
>   	u8 feature_list_valid;
>   	u64 feature_list;
> -
> +	u8 dynamic_mem_support_valid;
> +	u8 dynamic_mem_support;
>   };
>   
>   struct qmi_wlanfw_host_cap_resp_msg_v01 {
> @@ -267,7 +269,7 @@ struct qmi_wlanfw_host_cap_resp_msg_v01 {
>   
>   #define QMI_WLANFW_PHY_CAP_REQ_MSG_V01_MAX_LEN		0
>   #define QMI_WLANFW_PHY_CAP_REQ_V01			0x0057
> -#define QMI_WLANFW_PHY_CAP_RESP_MSG_V01_MAX_LEN		18
> +#define QMI_WLANFW_PHY_CAP_RESP_MSG_V01_MAX_LEN		22

this is not used anywhere, but since you're touching it should this be 
26 ? response TLV 7, num_phy 4, board_id 7, existing 
single_chip_mlo_support 4, and new dynamic_ddr_support 4


--
Ramesh