On Thu, 2022-05-26 at 19:02 +0800, Nancy.Lin wrote: > Add cmdq support for mtk-mmsys config API. > The mmsys config register settings need to take effect with the other > HW settings(like OVL_ADAPTOR...) at the same vblanking time. > > If we use CPU to write the mmsys reg, we can't guarantee all the > settings can be written in the same vblanking time. > Cmdq is used for this purpose. We prepare all the related HW settings > in one cmdq packet. The first command in the packet is "wait stream > done", > and then following with all the HW settings. After the cmdq packet is > flush to GCE HW. The GCE waits for the "stream done event" to coming > and then starts flushing all the HW settings. This can guarantee all > the settings flush in the same vblanking. > > Signed-off-by: Nancy.Lin <nancy.lin@xxxxxxxxxxxx> > Reviewed-by: AngeloGioacchino Del Regno < > angelogioacchino.delregno@xxxxxxxxxxxxx> > Tested-by: AngeloGioacchino Del Regno < > angelogioacchino.delregno@xxxxxxxxxxxxx> > --- > [Bo-Chen: Test on MT8195 Tomato Chromebook with external display] Tested-by: Bo-Chen Chen <rex-bc.chen@xxxxxxxxxxxx>
