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| author | Hans de Goede <hdegoede@redhat.com> | 2017-02-10 11:28:02 +0100 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2017-03-02 15:46:37 +0100 |
| commit | 264ec1a8221c60f9ccf13f58ac597da21235132d (patch) | |
| tree | ec3449403cbe99f9c0217fc5c6645d6cb55476d9 /drivers/gpu/drm/i915/Kconfig | |
| parent | 68f60946c1b6d1504af8994f4a419769217e4f23 (diff) | |
| download | blackbird-obmc-linux-264ec1a8221c60f9ccf13f58ac597da21235132d.tar.gz blackbird-obmc-linux-264ec1a8221c60f9ccf13f58ac597da21235132d.zip | |
drm/i915: Listen for PMIC bus access notifications
Listen for PMIC bus access notifications and get FORCEWAKE_ALL while
the bus is accessed to avoid needing to do any forcewakes, which need
PMIC bus access, while the PMIC bus is busy:
This fixes errors like these showing up in dmesg, usually followed
by a gfx or system freeze:
[drm:fw_domains_get [i915]] *ERROR* render: timed out waiting for forcewake ack request.
[drm:fw_domains_get [i915]] *MEDIA* render: timed out waiting for forcewake ack request.
i2c_designware 808622C1:06: punit semaphore timed out, resetting
i2c_designware 808622C1:06: PUNIT SEM: 2
i2c_designware 808622C1:06: couldn't acquire bus ownership
Downside of this approach is that it causes wakeups whenever the PMIC
bus is accessed. Unfortunately we cannot simply wait for the PMIC bus
to go idle when we hit a race, as forcewakes may be done from interrupt
handlers where we cannot sleep to wait for the i2c PMIC bus access to
finish.
Note that the notifications and thus the wakeups will only happen on
baytrail / cherrytrail devices using PMICs with a shared i2c bus for
P-Unit and host PMIC access (i2c busses with a _SEM method in their
APCI node), e.g. an axp288 PMIC.
I plan to write some patches for drivers accessing the PMIC bus to
limit their bus accesses to a bare minimum (e.g. cache registers, do not
update battery level more often then 4 times a minute), to limit the
amount of wakeups.
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=155241
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Tested-by: tagorereddy <tagore.chandan@gmail.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
[danvet: Wiggle in conflicts.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/i915/Kconfig')
| -rw-r--r-- | drivers/gpu/drm/i915/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig index 183f5dc1c3f2..88e60c9291e4 100644 --- a/drivers/gpu/drm/i915/Kconfig +++ b/drivers/gpu/drm/i915/Kconfig @@ -19,6 +19,7 @@ config DRM_I915 select INPUT if ACPI select ACPI_VIDEO if ACPI select ACPI_BUTTON if ACPI + select IOSF_MBI help Choose this option if you have a system that has "Intel Graphics Media Accelerator" or "HD Graphics" integrated graphics, |
