DRM driver and runtime suspend-resume handling?

[Jyri Sarha]

Hi,
While working with CRTC color related properties (gamma and CTM for
instance) and making them persistent over suspend-resume cycle it
occurred to me if I am just wasting resources by storing the property
values in the driver and restoring them in dev_pm_ops runtime_resume()..

Wouldn't it work if I would just:

1. Add a flag in the driver to indicate that the context may have been
lost since the previous atomic commit and set in runtime_resume().

2. And write the color properties to HW if the context lost flag is set
even if the drm_crtc_state color_mgmt_changed is false.

The color property values are there despite the color_mgmt_changed ==
false, aren't they?

Best regards,
Jyri

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