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| author |   Russell King <rmk+kernel@arm.linux.org.uk> | 2015-06-05 12:22:46 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2015-08-18 11:33:58 +0100 |
| commit | b872a8e16b3fb17c3fe1e97f4ed0803f4a740aae (patch) | |
| tree | ce8d2a4178dc5fc48aa51f24827cd218b5468125 /include/drm | |
| parent | drm: bridge/dw_hdmi: rename dw_hdmi_phy_enable_power() (diff) | |
| download | linux-dev-b872a8e16b3fb17c3fe1e97f4ed0803f4a740aae.tar.xz linux-dev-b872a8e16b3fb17c3fe1e97f4ed0803f4a740aae.zip | |
drm: bridge/dw_hdmi: fix phy enable/disable handling
The dw_hdmi enable/disable handling is particularly weak in several
regards:
* The hotplug interrupt could call hdmi_poweron() or hdmi_poweroff()
while DRM is setting a mode, which could race with a mode being set.
* Hotplug will always re-enable the phy whenever it detects an active
hotplug signal, even if DRM has disabled the output.
Resolve all of these by introducing a mutex to prevent races, and a
state-tracking bool so we know whether DRM wishes the output to be
enabled. We choose to use our own mutex rather than ->struct_mutex
so that we can still process interrupts in a timely fashion.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'include/drm')
0 files changed, 0 insertions, 0 deletions