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iris: Map scanout buffers WC instead of WB

Keith Packard requested to merge keithp/mesa:iris-wc-scanout into main

The scanout engine is not coherent with rendering, so make sure scanout buffers are mapped WC. This ensures that CPU rendering as done by the Xserver gets flushed to the frame buffer immediately instead of waiting for some future time.

Signed-off-by: Keith Packard keithp@keithp.com

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