netdev - [PATCH 1/2] bus: mhi: core: add SBL state callback

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Message-Id: <20221105194943.826847-1-robimarko@gmail.com>
Date:   Sat,  5 Nov 2022 20:49:42 +0100
From:   Robert Marko <robimarko@...il.com>
To:     mani@...nel.org, kvalo@...nel.org, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        gregkh@...uxfoundation.org, elder@...aro.org,
        hemantk@...eaurora.org, quic_jhugo@...cinc.com,
        quic_qianyu@...cinc.com, bbhatt@...eaurora.org,
        mhi@...ts.linux.dev, linux-arm-msm@...r.kernel.org,
        ath11k@...ts.infradead.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org
Cc:     ansuelsmth@...il.com, Robert Marko <robimarko@...il.com>
Subject: [PATCH 1/2] bus: mhi: core: add SBL state callback

Add support for SBL state callback in MHI core.

It is required for ath11k MHI devices in order to be able to set QRTR
instance ID in the SBL state so that QRTR instance ID-s dont conflict in
case of multiple PCI/MHI cards or AHB + PCI/MHI card.
Setting QRTR instance ID is only possible in SBL state and there is
currently no way to ensure that we are in that state, so provide a
callback that the controller can trigger off.

Signed-off-by: Robert Marko <robimarko@...il.com>
---
 drivers/bus/mhi/host/main.c | 1 +
 include/linux/mhi.h         | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/drivers/bus/mhi/host/main.c b/drivers/bus/mhi/host/main.c
index df0fbfee7b78..8b03dd1f0cb8 100644
--- a/drivers/bus/mhi/host/main.c
+++ b/drivers/bus/mhi/host/main.c
@@ -900,6 +900,7 @@ int mhi_process_ctrl_ev_ring(struct mhi_controller *mhi_cntrl,
 			switch (event) {
 			case MHI_EE_SBL:
 				st = DEV_ST_TRANSITION_SBL;
+				mhi_cntrl->status_cb(mhi_cntrl, MHI_CB_EE_SBL_MODE);
 				break;
 			case MHI_EE_WFW:
 			case MHI_EE_AMSS:
diff --git a/include/linux/mhi.h b/include/linux/mhi.h
index a5441ad33c74..beffe102dd19 100644
--- a/include/linux/mhi.h
+++ b/include/linux/mhi.h
@@ -34,6 +34,7 @@ struct mhi_buf_info;
  * @MHI_CB_SYS_ERROR: MHI device entered error state (may recover)
  * @MHI_CB_FATAL_ERROR: MHI device entered fatal error state
  * @MHI_CB_BW_REQ: Received a bandwidth switch request from device
+ * @MHI_CB_EE_SBL_MODE: MHI device entered SBL mode
  */
 enum mhi_callback {
 	MHI_CB_IDLE,
@@ -45,6 +46,7 @@ enum mhi_callback {
 	MHI_CB_SYS_ERROR,
 	MHI_CB_FATAL_ERROR,
 	MHI_CB_BW_REQ,
+	MHI_CB_EE_SBL_MODE,
 };
 
 /**
-- 
2.38.1