kernel/drivers/gpu/drm/sun4i/sun4i_backend.c, branch linux-4.17.y

drm/sun4i: backend: Support YUV planes

2018-03-19T21:04:57Z

Now that we have the guarantee that we will have only a single YUV plane, actually support them. The way it works is not really straightforward, since we first need to enable the YUV mode in the plane that we want to setup, and then we have a few registers to setup the YUV buffer and parameters. We also need to setup the color correction to actually have something displayed. Reviewed-by: Chen-Yu Tsai Signed-off-by: Maxime Ripard Link: https://patchwork.freedesktop.org/patch/msgid/66088c1398bd3189123f28a89a7ccc669fe9f296.1519931807.git-series.maxime.ripard@bootlin.com

drm/sun4i: backend: Check that we only have a single YUV plane

2018-03-19T15:36:21Z

Just like for the frontend, a single plane can use a YUV format. Make sure we have that constraint covered in our atomic_check. This is preliminary to the actual YUV support to make sure we don't end up in an impossible to support situation. Reviewed-by: Chen-Yu Tsai Signed-off-by: Maxime Ripard Link: https://patchwork.freedesktop.org/patch/msgid/2f8586493d9139b12efe7e94f65e9a149f818e0e.1519931807.git-series.maxime.ripard@bootlin.com

drm/sun4i: Add driver support for A80 display pipeline

2018-03-19T14:40:24Z

This patch adds support for the compatible strings of the A80 display pipeline. Signed-off-by: Chen-Yu Tsai Signed-off-by: Maxime Ripard Link: https://patchwork.freedesktop.org/patch/msgid/20180315114136.24747-6-wens@csie.org

drm/sun4i: backend: Remove ARGB spoofing

2018-02-22T15:20:59Z

We've had some code for quite some time to prevent the alpha bug from happening on the lowest primary plane. Since we now check for this in our atomic_check, we can simply remove it. Reviewed-by: Chen-Yu Tsai Signed-off-by: Maxime Ripard Link: https://patchwork.freedesktop.org/patch/msgid/965180afd8169ccaa848f061d16a2c1a9ec4d289.1518802627.git-series.maxime.ripard@bootlin.com

drm/sun4i: backend: Assign the pipes automatically

2018-02-22T15:19:52Z

Since we now have a way to enforce the zpos, check for the number of alpha planes, the only missing part is to assign our pipe automatically instead of hardcoding it. The algorithm is quite simple, but requires two iterations over the list of planes. In the first one (which is the same one that we've had to check for alpha, the frontend usage, and so on), we order the planes by their zpos. We can then do a second iteration over that array by ascending zpos starting with the pipe 0. When and if we encounter our alpha plane, we put it and all the other subsequent planes in the second pipe. Reviewed-by: Chen-Yu Tsai Signed-off-by: Maxime Ripard Link: https://patchwork.freedesktop.org/patch/msgid/e9caf21d831438d36a3ccc7cef229c9a7ea7f69f.1518802627.git-series.maxime.ripard@bootlin.com

drm/sun4i: backend: Check for the number of alpha planes

2018-01-29T13:02:42Z

Due to the way the composition is done in hardware, we can only have a single alpha-enabled plane active at a time, placed in the second (highest priority) pipe. Make sure of that in our atomic_check to not end up in an impossible scenario. Reviewed-by: Chen-Yu Tsai Signed-off-by: Maxime Ripard Link: https://patchwork.freedesktop.org/patch/msgid/7371f62a1385f2cbe3ed75dfca2e746338eb2286.1516617243.git-series.maxime.ripard@free-electrons.com

drm/sun4i: backend: Add support for zpos

2018-01-29T13:02:40Z

Our various planes have a configurable zpos, that combined with the pipes allow to configure the composition. Since the interaction between the pipes, zpos and alphas framebuffers is not trivial, let's just enable the zpos as an immutable property for now, and use that zpos in our atomic_update part. Reviewed-by: Chen-Yu Tsai Signed-off-by: Maxime Ripard Link: https://patchwork.freedesktop.org/patch/msgid/b006853e908bd06661c5bc1f2191121523bce0e4.1516617243.git-series.maxime.ripard@free-electrons.com

drm/sun4i: backend: Make sure we don't have a commit pending

2018-01-22T14:22:29Z

If we try to read the backend registers while it fetches the new values, we end up with the value of some random register instead of the one we asked for. In order to prevent that, let's make sure that the very first thing we do during our atomic modesetting is to let the commit bit come to a rest. We don't have to worry about anything else since the only time we will trigger a new transaction is during the atomic_commit which comes much later. Reviewed-by: Chen-Yu Tsai Signed-off-by: Maxime Ripard Link: https://patchwork.freedesktop.org/patch/msgid/35604307e5bde2b85c674de79fa7c4d55700f085.1516613040.git-series.maxime.ripard@free-electrons.com

drm/sun4i: backend: Add a custom atomic_check for the frontend

2018-01-22T14:17:32Z

Now that we have everything in place, we can start enabling the frontend. This is more difficult than one would assume since there can only be one plane using the frontend per-backend. We therefore need to make sure that the userspace will not try to setup multiple planes using it, since that would be impossible. In order to prevent that, we can create an atomic_check callback that will check that only one plane will effectively make use of the frontend in a given configuration, and will toggle the switch in that plane state so that the proper setup function can do their role. Reviewed-by: Chen-Yu Tsai Reviewed-by: Neil Armstrong Signed-off-by: Maxime Ripard Link: https://patchwork.freedesktop.org/patch/msgid/278e6c514a8311750fe627c7f28d58b3e2cbd825.1516613040.git-series.maxime.ripard@free-electrons.com

drm/sun4i: backend: Wire in the frontend

2018-01-22T14:17:04Z

Now that we have a driver, we can make use of it. This is done by adding a flag to our custom plane state that will trigger whether we should use the frontend on that particular plane or not. The rest is just plumbing to set up the backend to not perform the DMA but receive its data from the frontend. Note that we're still not making any use of the frontend itself, as no one is setting the flag yet. Reviewed-by: Chen-Yu Tsai Signed-off-by: Maxime Ripard Link: https://patchwork.freedesktop.org/patch/msgid/cdffc25eab2d817820cc78cbd24f1f4b99902014.1516613040.git-series.maxime.ripard@free-electrons.com