linux-kernel - [PATCH] power: supply: max77693: Fix wrong conversion of charge input threshold value

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Message-Id: <20250316-max77693-charger-input-threshold-fix-v1-1-2b037d0ac722@gmail.com>
Date: Sun, 16 Mar 2025 21:11:49 +0100
From: Artur Weber <aweber.kernel@...il.com>
To: Krzysztof Kozlowski <krzk@...nel.org>, 
 Sebastian Reichel <sre@...nel.org>
Cc: linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org, 
 ~postmarketos/upstreaming@...ts.sr.ht, 
 Artur Weber <aweber.kernel@...il.com>
Subject: [PATCH] power: supply: max77693: Fix wrong conversion of charge
 input threshold value

The charge input threshold voltage register on the MAX77693 PMIC accepts
four values: 0x0 for 4.3v, 0x1 for 4.7v, 0x2 for 4.8v and 0x3 for 4.9v.
Due to an oversight, the driver calculated the values for 4.7v and above
starting from 0x0, rather than from 0x1 ([(4700000 - 4700000) / 100000]
gives 0).

Add 1 to the calculation to ensure that 4.7v is converted to a register
value of 0x1 and that the other two voltages are converted correctly as
well.

Fixes: 87c2d9067893 ("power: max77693: Add charger driver for Maxim 77693")
Signed-off-by: Artur Weber <aweber.kernel@...il.com>
---
The charge input threshold voltage register on the MAX77693 PMIC accepts
four values: 0x0 for 4.3v, 0x1 for 4.7v, 0x2 for 4.8v and 0x3 for 4.9v.
Due to an oversight, the driver calculated the values for 4.7v and above
starting from 0x0, rather than from 0x1 ([(4700000 - 4700000) / 100000]
gives 0).

Add 1 to the calculation to ensure that 4.7v is converted to a register
value of 0x1 and that the other two voltages are converted correctly as
well.

Fixes: 87c2d9067893 ("power: max77693: Add charger driver for Maxim 77693")
---
 drivers/power/supply/max77693_charger.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/power/supply/max77693_charger.c b/drivers/power/supply/max77693_charger.c
index cdea35c0d1de1111311d198d042bfa5b10da52b7..027d6a539b65a2fe423f90bab27d705a8145f7e7 100644
--- a/drivers/power/supply/max77693_charger.c
+++ b/drivers/power/supply/max77693_charger.c
@@ -608,7 +608,7 @@ static int max77693_set_charge_input_threshold_volt(struct max77693_charger *chg
 	case 4700000:
 	case 4800000:
 	case 4900000:
-		data = (uvolt - 4700000) / 100000;
+		data = ((uvolt - 4700000) / 100000) + 1;
 		break;
 	default:
 		dev_err(chg->dev, "Wrong value for charge input voltage regulation threshold\n");

---
base-commit: ffd294d346d185b70e28b1a28abe367bbfe53c04
change-id: 20250316-max77693-charger-input-threshold-fix-992f56783586

Best regards,
-- 
Artur Weber <aweber.kernel@...il.com>