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* [PATCH v2 0/9] Add fan control support
@ 2026-07-17  4:17 Karthik Poosa
  2026-07-17  4:16 ` ✓ CI.KUnit: success for Add fan control support (rev2) Patchwork
                   ` (11 more replies)
  0 siblings, 12 replies; 21+ messages in thread
From: Karthik Poosa @ 2026-07-17  4:17 UTC (permalink / raw)
  To: intel-xe
  Cc: rodrigo.vivi, anshuman.gupta, badal.nilawar, raag.jadav,
	riana.tauro, sk.anirban, mallesh.koujalagi, soham.purkait,
	Karthik Poosa

This series adds Intel Xe fan control support through the hwmon sysfs ABI,
including fan maximum reporting, direct PWM control, mode control, and
programmable fan-curve points.

The patch set is ordered from backend enablement to user-visible controls
and full curve programming support.

Series overview

drm/xe/hwmon: initialize fan-control backend and runtime state
Initializes the fan-control backend and runtime state needed to safely
expose fan controls through hwmon.

drm/xe/hwmon: expose fanN_max
Adds fan maximum RPM reporting through fan1_max, fan2_max, and fan3_max.

drm/xe/hwmon: expose pwm1-3
Adds direct PWM duty control through pwm1-3 with hwmon-compatible 0..255
scaling.

drm/xe/hwmon: expose pwm1-3_enable
Adds PWM mode control through pwm1-3_enable:
0 = full speed
1 = manual user control
2 = firmware automatic control

drm/xe/hwmon: enable fan curve control support
Adds programmable per-fan curve points through:
pwm1-3_auto_point1-10_temp
pwm1-3_auto_point1-10_pwm

ABI updates are included in
Documentation/ABI/testing/sysfs-driver-intel-xe-hwmon, with implementation
in drivers/gpu/drm/xe/xe_hwmon.c.

Sysfs nodes and usage

Read fan speed and max RPM:
cat /sys/class/hwmon/hwmonX/fan1_input
cat /sys/class/hwmon/hwmonX/fan1_max

Set manual mode and direct PWM:
echo 1 > /sys/class/hwmon/hwmonX/pwm1_enable
echo 120 > /sys/class/hwmon/hwmonX/pwm1

Return to firmware automatic control:
echo 2 > /sys/class/hwmon/hwmonX/pwm1_enable

Program a fan curve:
echo 1 > /sys/class/hwmon/hwmonX/pwm1_enable
echo 30000 > /sys/class/hwmon/hwmonX/pwm1_auto_point1_temp
echo 20 > /sys/class/hwmon/hwmonX/pwm1_auto_point1_pwm
...
echo 85000 > /sys/class/hwmon/hwmonX/pwm1_auto_point10_temp
echo 200 > /sys/class/hwmon/hwmonX/pwm1_auto_point10_pwm

Note:

Package temperature (temp2_input) is used as the temperature reference for
fan table control.
For hardware acceptance, fan-curve temperatures must be strictly
increasing.
The user fan table is committed to hardware only after the last curve point
is written.
Fan curve currently supports only 10 fan curve points.

v2:

 - Added kernel-doc for fan control flow and sysfs behavior.
 - Added save/restore support for user fan table across suspend/resume.
 - Added late-binding handling to refresh fan information after late
   binding completes.
 - Preserved user-selected PWM mode across late-binding updates (do not
   force auto mode).
 - Fan curve points show stock table points when pwmX_enable=2.

Karthik Poosa (9):
  drm/xe/pcode: Introduce xe_pcode_read_timeout() API
  drm/xe/hwmon: initialize fan-control backend and table cache
  drm/xe/hwmon: expose fanN_max
  drm/xe/hwmon: expose pwm[1-3]
  drm/xe/hwmon: expose pwm[1-3]_enable
  drm/xe/hwmon: Enable fan curve control support
  drm/xe/hwmon: Add kernel-doc for fan control
  drm/xe/hwmon: preserve fan user table across suspend resume
  drm/xe/hwmon: Update fan info after late binding

 .../ABI/testing/sysfs-driver-intel-xe-hwmon   |   44 +
 drivers/gpu/drm/xe/xe_hwmon.c                 | 1408 ++++++++++++++++-
 drivers/gpu/drm/xe/xe_hwmon.h                 |    6 +
 drivers/gpu/drm/xe/xe_late_bind_fw.c          |    3 +
 drivers/gpu/drm/xe/xe_pcode.c                 |   11 +
 drivers/gpu/drm/xe/xe_pcode.h                 |    1 +
 drivers/gpu/drm/xe/xe_pcode_api.h             |    9 +
 drivers/gpu/drm/xe/xe_pm.c                    |    9 +
 8 files changed, 1476 insertions(+), 15 deletions(-)

-- 
2.25.1


^ permalink raw reply	[flat|nested] 21+ messages in thread
end of thread, other threads:[~2026-08-11 13:58 UTC | newest]

Thread overview: 21+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2026-07-17  4:17 [PATCH v2 0/9] Add fan control support Karthik Poosa
2026-07-17  4:16 ` ✓ CI.KUnit: success for Add fan control support (rev2) Patchwork
2026-07-17  4:17 ` [PATCH v2 1/9] drm/xe/pcode: Introduce xe_pcode_read_timeout() API Karthik Poosa
2026-07-17  4:17 ` [PATCH v2 2/9] drm/xe/hwmon: initialize fan-control backend and table cache Karthik Poosa
2026-08-10  6:03   ` Nilawar, Badal
2026-08-11 13:11   ` Nilawar, Badal
2026-07-17  4:17 ` [PATCH v2 3/9] drm/xe/hwmon: expose fanN_max Karthik Poosa
2026-07-23  5:34   ` Purkait, Soham
2026-07-17  4:17 ` [PATCH v2 4/9] drm/xe/hwmon: expose pwm[1-3] Karthik Poosa
2026-07-24  7:02   ` Purkait, Soham
2026-08-11 13:58     ` Poosa, Karthik
2026-07-17  4:17 ` [PATCH v2 5/9] drm/xe/hwmon: expose pwm[1-3]_enable Karthik Poosa
2026-07-17  4:17 ` [PATCH v2 6/9] drm/xe/hwmon: Enable fan curve control support Karthik Poosa
2026-07-22 18:16   ` Purkait, Soham
2026-07-17  4:17 ` [PATCH v2 7/9] drm/xe/hwmon: Add kernel-doc for fan control Karthik Poosa
2026-07-17  4:17 ` [PATCH v2 8/9] drm/xe/hwmon: preserve fan user table across suspend resume Karthik Poosa
2026-08-10  5:53   ` Nilawar, Badal
2026-07-17  4:17 ` [PATCH v2 9/9] drm/xe/hwmon: Update fan info after late binding Karthik Poosa
2026-07-20  6:20   ` Purkait, Soham
2026-07-17  5:00 ` ✓ Xe.CI.BAT: success for Add fan control support (rev2) Patchwork
2026-07-17  8:18 ` ✗ Xe.CI.FULL: failure " Patchwork

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