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Author SHA1 Message Date
Srinivas Pandruvada 6c355fafeb thermal: Intel SoC DTS: Add Braswell support 
Added Intel Braswell CPU id for SOC DTS. Since this doesn't support
APIC IRQ, the driver is modified to have capability to not register
any modifiable trips.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
 2015-01-29 11:28:01 +08:00
Maurice Petallo 05629296ee thermal: Intel SoC DTS: Don't do thermal zone update inside spin_lock 
The driver calls spin_lock_irqsave during DTS interrupt. The interrupt
handle then calls thermal_zone_device_update which implicitly calls
a sleep function and produce the following bug:

BUG: sleeping function called from invalid context at kernel/locking/mutex.c:97
in_atomic(): 1, irqs_disabled(): 1, pid: 920, name: irq/86-soc_dts
CPU: 0 PID: 920 Comm: irq/86-soc_dts Tainted: G            E  3.17.0-rc2+ #1
Hardware name: Intel Corp. VALLEYVIEW B3 PLATFORM/NOTEBOOK, BIOS BYTICRB1.86C.0092.R31.1408290850 08/29/2014
 00000000 00000000 c25dbe74 c1818cfd f3cc488c c25dbe9c c1059305 c1b4063b
 00000001 00000001 00000398 f3cc488c f6817644 f6817644 f3ecc6c0 c25dbea8
 c18208f2 f6817400 c25dbebc c159b0bb c25dbedc f6817400 f32a2300 c25dbee8
Call Trace:
 [<c1818cfd>] dump_stack+0x48/0x60
 [<c1059305>] __might_sleep+0xec/0xf4
 [<c18208f2>] mutex_lock+0x1c/0x34
 [<c159b0bb>] thermal_zone_get_temp+0x34/0x59
 [<c159bde5>] thermal_zone_device_update+0x2d/0xcb
 [<f85da16a>] ? iosf_mbi_write+0x6c/0x74 [iosf_mbi]
 [<f7c7445d>] soc_irq_thread_fn+0x10c/0x163 [intel_soc_dts_thermal]
 [<c107b72b>] irq_thread_fn+0x18/0x2a
 [<c107bedb>] irq_thread+0x81/0x11f
 [<c107b713>] ? irq_finalize_oneshot+0x7c/0x7c
 [<c107bf79>] ? irq_thread+0x11f/0x11f
 [<c107be5a>] ? wake_threads_waitq+0x31/0x31
 [<c1054217>] kthread+0x87/0x8c
 [<c1821e41>] ret_from_kernel_thread+0x21/0x30
 [<c1054190>] ? __kthread_parkme+0x55/0x55

Signed-off-by: Maurice Petallo <mauricex.r.petallo@intel.com>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Acked-by: Eduardo Valentin <edubezval@gmail.com>
CC: Kweh, Hock Leong <hock.leong.kweh@intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
 2014-12-09 11:38:16 +08:00
Srinivas Pandruvada bc40b5e320 thermal: Intel SoC DTS thermal 
In the Intel SoCs like Bay Trail, there are 2 additional digital temperature
sensors(DTS), in addition to the standard DTSs in the core. Also they support
4 programmable thresholds, out of which two can be used by OSPM. These
thresholds can be used by OSPM thermal control. Out of these two thresholds,
one is used by driver and one user mode can change via thermal sysfs to get
notifications on threshold violations.

The driver defines one critical trip points, which is set to TJ MAX - offset.
The offset can be changed via module parameter (default 5C). Also it uses
one of the thresholds to get notification for this temperature violation.
This is very important for orderly shutdown as the many of these devices don't
have ACPI thermal zone, and expects that there is some other thermal control
mechanism present in OSPM. When a Linux distro is used without additional
specialized thermal control program, BIOS can do force shutdown when thermals
are not under control. When temperature reaches critical, the Linux thermal
core will initiate an orderly shutdown.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
 2014-05-15 16:37:24 +08:00