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Tue, 13 Jan 2026 18:55:48 -0800 (PST) Received: from dellphi.android606.com ([2601:644:4784:74b0:c2e:ecff:fed9:d646]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-121f2434abesm29371626c88.4.2026.01.13.18.55.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 13 Jan 2026 18:55:47 -0800 (PST) From: Andrew Mark To: armin.wolf@embedded-designs.de Cc: linux-kernel@vger.kernel.org, Andrew Mark Subject: [PATCH v2] hwmon: (dell-smm) Extend fan support to 5 fans Date: Wed, 14 Jan 2026 02:54:57 +0000 Message-ID: <20260114025457.134659-1-android606@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260110034732.236285-1-android606@gmail.com> References: <20260110034732.236285-1-android606@gmail.com> 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" Dell Precision Tower workstations have 5 fan connectors, but the driver was limited to 4 fans after commit dbcfcb239b3b ("hwmon: (dell-smm) Increment the number of fans"). This patch increases DELL_SMM_NO_FANS to 5 and adds the necessary hwmon channel info for the fifth fan and its PWM control. Without this patch, the PCIe/GPU cooling fan (fan 5) is not controllable, which can lead to overheating on systems with high-power fanless GPUs that depend on chassis cooling. Tested on Dell Precision Tower 5810 (BIOS A34) with all 5 fans responding correctly to PWM control. Fan mapping for Precision Tower 5810: - fan0: CPU heatsink - fan1: Second CPU (dual-CPU systems only) - fan2: Right DIMM bank - fan3: Left DIMM bank - fan4: PCIe/GPU cooling Signed-off-by: Andrew Mark --- v2: - Removed DMI quirks changes. Setting fan type names in sensors3 config instead. =20 drivers/hwmon/dell-smm-hwmon.c | 5 +++++ 1 file changed, 5 insertions(+), 0 deletions(-) diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c index 6040a8940..88263fa53 100644 --- a/drivers/hwmon/dell-smm-hwmon.c +++ b/drivers/hwmon/dell-smm-hwmon.c @@ -74,7 +74,7 @@ #define DELL_SMM_LEGACY_EXECUTE 0x1 =20 #define DELL_SMM_NO_TEMP 10 -#define DELL_SMM_NO_FANS 4 +#define DELL_SMM_NO_FANS 5 =20 /* limit fan multiplier to avoid overflow */ #define DELL_SMM_MAX_FAN_MULT (INT_MAX / U16_MAX) @@ -1129,12 +1129,15 @@ static const struct hwmon_channel_info * const dell= _smm_info[] =3D { HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MIN | HWMON_F_MAX | HWMON_F_TARGET, HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MIN | HWMON_F_MAX | + HWMON_F_TARGET, + HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MIN | HWMON_F_MAX | HWMON_F_TARGET ), HWMON_CHANNEL_INFO(pwm, HWMON_PWM_INPUT | HWMON_PWM_ENABLE, HWMON_PWM_INPUT | HWMON_PWM_ENABLE, HWMON_PWM_INPUT | HWMON_PWM_ENABLE, + HWMON_PWM_INPUT | HWMON_PWM_ENABLE, HWMON_PWM_INPUT | HWMON_PWM_ENABLE ), NULL --=20 2.43.0