linux-kernel - [PATCH] Input: HID-rmi - ignore to rmi_hid_read

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Date:   Mon,  1 Aug 2022 14:46:43 +0800
From:   margeyang <marge.yang@...aptics.corp-partner.google.com>
To:     dmitry.torokhov@...il.com, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     marge.yang@...synaptics.com, derek.chegn@...synaptcs.com,
        vincent.huang@...synaptics.com,
        Marge Yang <marge.yang@...aptics.corp-partner.google.com>
Subject: [PATCH] Input: HID-rmi - ignore to rmi_hid_read_block after system resumes.

From: Marge Yang <marge.yang@...aptics.corp-partner.google.com>

ignore to rmi_hid_read_block function once after system resumes.
Because

Signed-off-by: Marge Yang<marge.yang@...aptics.corp-partner.google.com>
---
 drivers/hid/hid-rmi.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/hid/hid-rmi.c b/drivers/hid/hid-rmi.c
index 311eee599ce9..1b038f3db0f1 100644
--- a/drivers/hid/hid-rmi.c
+++ b/drivers/hid/hid-rmi.c
@@ -101,7 +101,7 @@ struct rmi_data {
 };
 
 #define RMI_PAGE(addr) (((addr) >> 8) & 0xff)
-
+int ignoreonce;
 static int rmi_write_report(struct hid_device *hdev, u8 *report, int len);
 
 /**
@@ -203,7 +203,13 @@ static int rmi_hid_read_block(struct rmi_transport_dev *xport, u16 addr,
 		if (ret < 0)
 			goto exit;
 	}
-
+	if (ignoreonce == 1) {
+		dev_err(&hdev->dev,
+			"ignoreonce (%d)\n",
+			ignoreonce);
+		ignoreonce = 0;
+		goto exit;
+	}
 	for (retries = 5; retries > 0; retries--) {
 		data->writeReport[0] = RMI_READ_ADDR_REPORT_ID;
 		data->writeReport[1] = 0; /* old 1 byte read count */
@@ -468,7 +474,10 @@ static int rmi_post_resume(struct hid_device *hdev)
 	ret = hid_hw_open(hdev);
 	if (ret)
 		return ret;
-
+	// Avoid to read rmi_hid_read_block once after system resumes.
+	// The interrupt will be pulled down
+	// after RMI Read command(Report ID:0x0A).
+	ignoreonce = 1;
 	ret = rmi_reset_attn_mode(hdev);
 	if (ret)
 		goto out;
-- 
2.22.0.windows.1