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Wed, 13 May 2026 12:39:47 -0700 (PDT) From: foobisdweik To: Hans de Goede , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= Cc: platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org, foobisdweik Subject: [PATCH 2/2] platform/x86: hp-wmi: Expose independent CPU/GPU pwm channels Date: Wed, 13 May 2026 12:39:16 -0700 Message-ID: <20260513193916.84673-3-dweikmferris@gmail.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260513193916.84673-1-dweikmferris@gmail.com> References: <20260513193916.84673-1-dweikmferris@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: 8bit The Victus-S WMI fan-speed-set query (HPWMI_VICTUS_S_FAN_SPEED_SET_QUERY, GM2E in firmware) takes a two-byte buffer [cpu, gpu] and writes the values to EC SRP1/SRP2 setpoints independently. The driver however drove both fans from a single hwmon pwm1 attribute, with the GPU value derived as cpu + priv->gpu_delta from the fan table. This makes asymmetric fan curves (common ask: GPU fan louder than CPU under heavy gaming load) impossible from userspace fan-control tools that expect one pwm attribute per fan. Promote priv->pwm to a two-element array, add a second pwm hwmon channel, and extend hp_wmi_hwmon_write() / hp_wmi_apply_fan_settings() to drive the per-channel setpoints through GM2E. The U8_MAX sentinel in hp_wmi_fan_speed_set() selects the new per-fan path; existing callers using HP_FAN_SPEED_AUTOMATIC or a direct rpm value keep their behavior. The second pwm channel is only visible on Victus-S-capable boards, since other HP laptops still use the legacy single-fan WMI commands. Tested on OMEN by HP Laptop 16-b1xxx (8A13): writing pwm1=60, pwm2=200 in manual mode drives CPU fan to ~1600 RPM and GPU fan to ~5700 RPM simultaneously, verified via fan1_input/fan2_input tachs and direct read of EC offsets 0xB0..0xB3. Signed-off-by: foobisdweik --- drivers/platform/x86/hp/hp-wmi.c | 45 +++++++++++++++++++++++--------- 1 file changed, 32 insertions(+), 13 deletions(-) diff --git a/drivers/platform/x86/hp/hp-wmi.c b/drivers/platform/x86/hp/hp-wmi.c index 389506a6d2e3..40eb3715583a 100644 --- a/drivers/platform/x86/hp/hp-wmi.c +++ b/drivers/platform/x86/hp/hp-wmi.c @@ -486,7 +486,7 @@ struct hp_wmi_hwmon_priv { u8 max_rpm; int gpu_delta; u8 mode; - u8 pwm; + u8 pwm[2]; struct delayed_work keep_alive_dwork; }; @@ -822,12 +822,18 @@ static int hp_wmi_fan_speed_set(struct hp_wmi_hwmon_priv *priv, u8 speed) fan_speed[GPU_FAN] = speed; /* - * GPU fan speed is always a little higher than CPU fan speed, we fetch - * this delta value from the fan table during hwmon init. - * Exception: Speed is set to HP_FAN_SPEED_AUTOMATIC, to revert to - * automatic mode. + * Pass-through value U8_MAX: drive each fan from its own + * priv->pwm[] setpoint converted via pwm_to_rpm(). Used by the + * hwmon pwm1/pwm2 path that allows independent CPU/GPU fan control. + * + * Otherwise: GPU fan speed is always a little higher than CPU fan + * speed; we fetch this delta from the fan table during hwmon init. + * Exception: HP_FAN_SPEED_AUTOMATIC reverts to automatic mode. */ - if (speed != HP_FAN_SPEED_AUTOMATIC) { + if (speed == U8_MAX) { + fan_speed[CPU_FAN] = pwm_to_rpm(priv->pwm[CPU_FAN], priv); + fan_speed[GPU_FAN] = pwm_to_rpm(priv->pwm[GPU_FAN], priv); + } else if (speed != HP_FAN_SPEED_AUTOMATIC) { gpu_speed = speed + priv->gpu_delta; fan_speed[GPU_FAN] = clamp_val(gpu_speed, 0, U8_MAX); } @@ -2398,7 +2404,7 @@ static int hp_wmi_apply_fan_settings(struct hp_wmi_hwmon_priv *priv) case PWM_MODE_MANUAL: if (!is_victus_s_thermal_profile()) return -EOPNOTSUPP; - ret = hp_wmi_fan_speed_set(priv, pwm_to_rpm(priv->pwm, priv)); + ret = hp_wmi_fan_speed_set(priv, U8_MAX); if (ret < 0) return ret; mod_delayed_work(system_wq, &priv->keep_alive_dwork, @@ -2429,6 +2435,12 @@ static umode_t hp_wmi_hwmon_is_visible(const void *data, { switch (type) { case hwmon_pwm: + /* + * Second pwm channel only exists on Victus-S-style boards + * which expose an independent GPU fan setpoint. + */ + if (channel == 1 && !is_victus_s_thermal_profile()) + return 0; if (attr == hwmon_pwm_input && !is_victus_s_thermal_profile()) return 0; return 0644; @@ -2514,7 +2526,7 @@ static int hp_wmi_hwmon_write(struct device *dev, enum hwmon_sensor_types type, /* ensure PWM input is within valid fan speeds */ rpm = pwm_to_rpm(val, priv); rpm = clamp_val(rpm, priv->min_rpm, priv->max_rpm); - priv->pwm = rpm_to_pwm(rpm, priv); + priv->pwm[channel] = rpm_to_pwm(rpm, priv); return hp_wmi_apply_fan_settings(priv); } switch (val) { @@ -2525,13 +2537,18 @@ static int hp_wmi_hwmon_write(struct device *dev, enum hwmon_sensor_types type, if (!is_victus_s_thermal_profile()) return -EOPNOTSUPP; /* - * When switching to manual mode, set fan speed to - * current RPM values to ensure a smooth transition. + * When switching to manual mode, seed each per-fan + * setpoint from its current measured RPM so the + * transition is smooth. */ - rpm = hp_wmi_get_fan_speed_victus_s(channel); + rpm = hp_wmi_get_fan_speed_victus_s(CPU_FAN); + if (rpm < 0) + return rpm; + priv->pwm[CPU_FAN] = rpm_to_pwm(rpm / 100, priv); + rpm = hp_wmi_get_fan_speed_victus_s(GPU_FAN); if (rpm < 0) return rpm; - priv->pwm = rpm_to_pwm(rpm / 100, priv); + priv->pwm[GPU_FAN] = rpm_to_pwm(rpm / 100, priv); priv->mode = PWM_MODE_MANUAL; return hp_wmi_apply_fan_settings(priv); case PWM_MODE_AUTO: @@ -2547,7 +2564,9 @@ static int hp_wmi_hwmon_write(struct device *dev, enum hwmon_sensor_types type, static const struct hwmon_channel_info * const info[] = { HWMON_CHANNEL_INFO(fan, HWMON_F_INPUT, HWMON_F_INPUT), - HWMON_CHANNEL_INFO(pwm, HWMON_PWM_ENABLE | HWMON_PWM_INPUT), + HWMON_CHANNEL_INFO(pwm, + HWMON_PWM_ENABLE | HWMON_PWM_INPUT, + HWMON_PWM_ENABLE | HWMON_PWM_INPUT), NULL }; -- 2.54.0