drm/i2c: tda998x: re-implement "Fix EDID read timeout on HDMI connect"

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Commit 6833d26ef8 ("drm: tda998x: Fix EDID read timeout on HDMI
connect") used a weak scheme to try and delay reading EDID on a HDMI
connect event.  It is weak because delaying the notification of a
hotplug event does not stop userspace from trying to read the EDID
within the 100ms delay.

The solution provided here solves this issue:
* When a HDMI connection event is detected, mark a blocking flag for
  EDID reads, and start a timer for the delay.
* If an EDID read is attempted, and the blocking flag is set, wait
  for the blocking flag to clear.
* When the timer expires, clear the blocking flag and wake any thread
  waiting for the EDID read.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

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This commit is contained in:

Russell King 2015-06-06 21:41:09 +01:00

parent f84a97d480

commit 0fc6f44d96

1 changed files with 68 additions and 12 deletions

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drivers/gpu/drm/i2c/tda998x_drv.c

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