linux-kernel - [PATCH v2 1/1] extcon: intel-mrfld: Sync hardware and software state on init

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Date:   Tue, 18 May 2021 23:27:09 +0200
From:   Ferry Toth <ftoth@...londelft.nl>
To:     linux-kernel@...r.kernel.org
Cc:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Ferry Toth <ftoth@...londelft.nl>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        stable@...r.kernel.org
Subject: [PATCH v2 1/1] extcon: intel-mrfld: Sync hardware and software state on init

extcon driver for Basin Cove PMIC shadows the switch status used for dwc3
DRD to detect a change in the switch position. This change initializes the
status at probe time.

Signed-off-by: Ferry Toth <ftoth@...londelft.nl>
Fixes: 492929c54791 ("extcon: mrfld: Introduce extcon driver for Basin Cove PMIC")
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
Cc: stable@...r.kernel.org
---

v2:
 - Clarified patch title (Chanwoo)
---
 drivers/extcon/extcon-intel-mrfld.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/extcon/extcon-intel-mrfld.c b/drivers/extcon/extcon-intel-mrfld.c
index f47016fb28a8..cd1a5f230077 100644
--- a/drivers/extcon/extcon-intel-mrfld.c
+++ b/drivers/extcon/extcon-intel-mrfld.c
@@ -197,6 +197,7 @@ static int mrfld_extcon_probe(struct platform_device *pdev)
 	struct intel_soc_pmic *pmic = dev_get_drvdata(dev->parent);
 	struct regmap *regmap = pmic->regmap;
 	struct mrfld_extcon_data *data;
+	unsigned int status;
 	unsigned int id;
 	int irq, ret;
 
@@ -244,6 +245,14 @@ static int mrfld_extcon_probe(struct platform_device *pdev)
 	/* Get initial state */
 	mrfld_extcon_role_detect(data);
 
+	/*
+	 * Cached status value is used for cable detection, see comments
+	 * in mrfld_extcon_cable_detect(), we need to sync cached value
+	 * with a real state of the hardware.
+	 */
+	regmap_read(regmap, BCOVE_SCHGRIRQ1, &status);
+	data->status = status;
+
 	mrfld_extcon_clear(data, BCOVE_MIRQLVL1, BCOVE_LVL1_CHGR);
 	mrfld_extcon_clear(data, BCOVE_MCHGRIRQ1, BCOVE_CHGRIRQ_ALL);
 
-- 
2.30.2