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1d5a95b5c9
So far we've sort of protected the global state under dev_priv with the connection_mutex. I wan to change that so that we can change the cdclk even for pure plane updates. To that end let's formalize the protection of the global state to follow what I started with the cdclk code already (though not entirely properly) such that any crtc mutex will suffice as a read lock, and all crtcs mutexes act as the write lock. We'll also pimp intel_atomic_state_clear() to clear the entire global state, so that we don't accidentally leak stale information between the locking retries. As a slight optimization we'll only lock the crtc mutexes to protect the global state, however if and when we actually have to poke the hw (eg. if the actual cdclk changes) we must serialize commits across all crtcs so that a parallel nonblocking commit can't get ahead of the cdclk reprogamming. We do that by adding all crtcs to the state. TODO: the old global state examined during commit may still be a problem since it always looks at the _latest_ swapped state in dev_priv. Need to add proper old/new state for that too I think. v2: Remeber to serialize the commits if necessary Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191015193035.25982-3-ville.syrjala@linux.intel.com Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com> |
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