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Nikolaus Schaller" To: Sebastian Reichel , Jerry Lv Cc: =?UTF-8?q?Pali=20Roh=C3=A1r?= , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, letux-kernel@openphoenux.org, stable@vger.kernel.org, kernel@pyra-handheld.com, andreas@kemnade.info, "H. Nikolaus Schaller" Subject: [PATCH v2 2/2] power: supply: bq27xxx: restrict no-battery detection to bq27000 Date: Sat, 23 Aug 2025 12:34:57 +0200 Message-ID: X-Mailer: git-send-email 2.50.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" There are fuel gauges in the bq27xxx series (e.g. bq27z561) which may in so= me cases report 0xff as the value of BQ27XXX_REG_FLAGS that should not be interpreted as "no battery" like for a disconnected battery with some built in bq27000 chip. So restrict the no-battery detection originally introduced by commit 3dd843e1c26a ("bq27000: report missing device better.") to the bq27000. There is no need to backport further because this was hidden before commit f16d9fb6cf03 ("power: supply: bq27xxx: Retrieve again when busy") Fixes: f16d9fb6cf03 ("power: supply: bq27xxx: Retrieve again when busy") Suggested-by: Jerry Lv Cc: stable@vger.kernel.org Signed-off-by: H. Nikolaus Schaller --- drivers/power/supply/bq27xxx_battery.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/power/supply/bq27xxx_battery.c b/drivers/power/supply/= bq27xxx_battery.c index dadd8754a73a8..3363af24017ae 100644 --- a/drivers/power/supply/bq27xxx_battery.c +++ b/drivers/power/supply/bq27xxx_battery.c @@ -1944,8 +1944,8 @@ static void bq27xxx_battery_update_unlocked(struct bq= 27xxx_device_info *di) bool has_singe_flag =3D di->opts & BQ27XXX_O_ZERO; =20 cache.flags =3D bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag); - if ((cache.flags & 0xff) =3D=3D 0xff) - cache.flags =3D -ENODEV; /* read error */ + if (di->chip =3D=3D BQ27000 && (cache.flags & 0xff) =3D=3D 0xff) + cache.flags =3D -ENODEV; /* bq27000 hdq read error */ if (cache.flags >=3D 0) { cache.capacity =3D bq27xxx_battery_read_soc(di); =20 --=20 2.50.1