From 84baf1725dc532d9746df2d216c1921154767109 Mon Sep 17 00:00:00 2001 From: Srinivas Pandruvada Date: Tue, 4 Oct 2016 13:51:40 -0700 Subject: [PATCH] ACPI / fan: Fix error reading cur_state On some platforms with ACPI4 variable speed fan, reading cur_state from cooling device returns "invalid value" error. This confuses user space applications. This issue occurs as the current driver doesn't take account of "FineGrainControl" from _FIF(Fan Information). When the "FineGrainControl" is set, _FSL(FSL Set Level) takes argument as a percent, which doesn't have to match from any control value from _FPS(Fan Performance States). It is also possible that the Fan is not actually running at the requested speed returning a lower speed. On some platforms the BIOS is setting fan speed to a level during boot, which will not have an exact match to _FPS control values. The current implementation will treat this level as invalid value. The simple change is to atleast return state corresponding to a maximum control value in the _FPS compared to the current level. Signed-off-by: Srinivas Pandruvada Signed-off-by: Rafael J. Wysocki --- drivers/acpi/fan.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/fan.c b/drivers/acpi/fan.c index 384cfc3083e1..6cf4988206f2 100644 --- a/drivers/acpi/fan.c +++ b/drivers/acpi/fan.c @@ -129,8 +129,18 @@ static int fan_get_state_acpi4(struct acpi_device *device, unsigned long *state) control = obj->package.elements[1].integer.value; for (i = 0; i < fan->fps_count; i++) { - if (control == fan->fps[i].control) + /* + * When Fine Grain Control is set, return the state + * corresponding to maximum fan->fps[i].control + * value compared to the current speed. Here the + * fan->fps[] is sorted array with increasing speed. + */ + if (fan->fif.fine_grain_ctrl && control < fan->fps[i].control) { + i = (i > 0) ? i - 1 : 0; break; + } else if (control == fan->fps[i].control) { + break; + } } if (i == fan->fps_count) { dev_dbg(&device->dev, "Invalid control value returned\n"); -- 2.20.1