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drm/etnaviv: fix TS cache flushing on GPUs with BLT engine
As seen in the Vivante kernel driver, most GPUs with the BLT engine have a broken TS cache flush. The workaround is to temporarily set the BLT command to CLEAR_IMAGE, without actually executing the clear. Apparently this state change is enough to trigger the required TS cache flush. As the BLT engine is completely asychronous, we also need a few more stall states to synchronize the flush with the frontend. Root-caused-by: Jonathan Marek <[email protected]> Signed-off-by: Lucas Stach <[email protected]>
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