linux-kernel - [PATCH] HID: intel_ish-hid: HBM: Use connected standby state bit during suspend/resume

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Message-Id: <20210303062825.7724-1-xiang.ye@intel.com>
Date:   Wed,  3 Mar 2021 14:28:25 +0800
From:   Ye Xiang <xiang.ye@...el.com>
To:     jikos@...nel.org, jic23@...nel.org,
        srinivas.pandruvada@...ux.intel.com
Cc:     linux-input@...r.kernel.org, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org, Ye Xiang <xiang.ye@...el.com>
Subject: [PATCH] HID: intel_ish-hid: HBM: Use connected standby state bit during suspend/resume

ISH firmware uses connected standby state bit (CONNECTED_STANDBY_STATE_BIT bit 1)
to notify current power state to sensors instead of suspend state bit (bit 0).
So send both SUSPEND_STATE_BIT and CONNECTED_STANDBY_STATE_BIT to firmware
to be compatible with the previous version.

Signed-off-by: xiangye <xiang.ye@...el.com>
---
 drivers/hid/intel-ish-hid/ishtp/hbm.c | 6 +++---
 drivers/hid/intel-ish-hid/ishtp/hbm.h | 1 +
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/hid/intel-ish-hid/ishtp/hbm.c b/drivers/hid/intel-ish-hid/ishtp/hbm.c
index 30a91d068306..dbfae60f2621 100644
--- a/drivers/hid/intel-ish-hid/ishtp/hbm.c
+++ b/drivers/hid/intel-ish-hid/ishtp/hbm.c
@@ -914,7 +914,7 @@ static inline void fix_cl_hdr(struct ishtp_msg_hdr *hdr, size_t length,
 /*** Suspend and resume notification ***/
 
 static uint32_t current_state;
-static uint32_t supported_states = 0 | SUSPEND_STATE_BIT;
+static uint32_t supported_states = SUSPEND_STATE_BIT | CONNECTED_STANDBY_STATE_BIT;
 
 /**
  * ishtp_send_suspend() - Send suspend message to FW
@@ -933,7 +933,7 @@ void ishtp_send_suspend(struct ishtp_device *dev)
 	memset(&state_status_msg, 0, len);
 	state_status_msg.hdr.cmd = SYSTEM_STATE_STATUS;
 	state_status_msg.supported_states = supported_states;
-	current_state |= SUSPEND_STATE_BIT;
+	current_state |= (SUSPEND_STATE_BIT | CONNECTED_STANDBY_STATE_BIT);
 	dev->print_log(dev, "%s() sends SUSPEND notification\n", __func__);
 	state_status_msg.states_status = current_state;
 
@@ -959,7 +959,7 @@ void ishtp_send_resume(struct ishtp_device *dev)
 	memset(&state_status_msg, 0, len);
 	state_status_msg.hdr.cmd = SYSTEM_STATE_STATUS;
 	state_status_msg.supported_states = supported_states;
-	current_state &= ~SUSPEND_STATE_BIT;
+	current_state &= ~(CONNECTED_STANDBY_STATE_BIT | SUSPEND_STATE_BIT);
 	dev->print_log(dev, "%s() sends RESUME notification\n", __func__);
 	state_status_msg.states_status = current_state;
 
diff --git a/drivers/hid/intel-ish-hid/ishtp/hbm.h b/drivers/hid/intel-ish-hid/ishtp/hbm.h
index 7c445b203f2a..08f3f3ceb18c 100644
--- a/drivers/hid/intel-ish-hid/ishtp/hbm.h
+++ b/drivers/hid/intel-ish-hid/ishtp/hbm.h
@@ -235,6 +235,7 @@ struct dma_xfer_hbm {
 #define SYSTEM_STATE_QUERY_SUBSCRIBERS		0x3
 #define SYSTEM_STATE_STATE_CHANGE_REQ		0x4
 /*indicates suspend and resume states*/
+#define CONNECTED_STANDBY_STATE_BIT		(1<<0)
 #define SUSPEND_STATE_BIT			(1<<1)
 
 struct ish_system_states_header {
-- 
2.17.1