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drm/vc4: Add a delay after disabling hdmi phy output
There appears to be a requirement for some devices (I'm testing with a 8K VRROOM 40Gbps HDMI switch) for a measable delay between removing the hdmi phy output from the old mode, to enabling the hdmi phy output for the new mode. Without the delay, a mode switch has a small change of getting a permanent 'no signal', which requires a subsequent mode switch or a unplug/replug to redetect. Switching between 4kp24/25/30 modes fails about 5% of time in my testing. Add a delay to make it impossible to switch faster than this. Signed-off-by: Dom Cobley <[email protected]>
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