drm/imx: Add active plane reconfiguration support

We don't support configuring active plane on-the-fly for imx-drm.
The relevant CRTC should be disabled before the plane configuration.
Of course, the plane itself should be disabled as well.
This patch adds active plane reconfiguration support by forcing CRTC
mode change and disabling-enabling plane in plane's ->atomic_update
callback.

Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Philipp Zabel <p.zabel@pengutronix.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Peter Senna Tschudin <peter.senna@gmail.com>
Signed-off-by: Liu Ying <gnuiyl@gmail.com>
Tested-by: Peter Senna Tschudin <peter.senna@gmail.com>
Tested-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

diff --git a/drivers/gpu/drm/imx/imx-drm-core.c b/drivers/gpu/drm/imx/imx-drm-core.c
index 9f7dafce3a4cf8aa94e5ac8c64ca210124609fbd..7bf90e9e613994de518d2bc3a202f6658082e6ce 100644 (file)
--- a/drivers/gpu/drm/imx/imx-drm-core.c
+++ b/drivers/gpu/drm/imx/imx-drm-core.c
@@ -171,10 +171,34 @@ static void imx_drm_output_poll_changed(struct drm_device *drm)
        drm_fbdev_cma_hotplug_event(imxdrm->fbhelper);
 }
 
+static int imx_drm_atomic_check(struct drm_device *dev,
+                               struct drm_atomic_state *state)
+{
+       int ret;
+
+       ret = drm_atomic_helper_check_modeset(dev, state);
+       if (ret)
+               return ret;
+
+       ret = drm_atomic_helper_check_planes(dev, state);
+       if (ret)
+               return ret;
+
+       /*
+        * Check modeset again in case crtc_state->mode_changed is
+        * updated in plane's ->atomic_check callback.
+        */
+       ret = drm_atomic_helper_check_modeset(dev, state);
+       if (ret)
+               return ret;
+
+       return ret;
+}
+
 static const struct drm_mode_config_funcs imx_drm_mode_config_funcs = {
        .fb_create = drm_fb_cma_create,
        .output_poll_changed = imx_drm_output_poll_changed,
-       .atomic_check = drm_atomic_helper_check,
+       .atomic_check = imx_drm_atomic_check,
        .atomic_commit = drm_atomic_helper_commit,
 };
 

diff --git a/drivers/gpu/drm/imx/ipuv3-plane.c b/drivers/gpu/drm/imx/ipuv3-plane.c
index 4ad67d015ec7fdcb32dc84b17ebb99eb185590d2..29423e757d365edce655e89aa1ca2f16fe49fba2 100644 (file)
--- a/drivers/gpu/drm/imx/ipuv3-plane.c
+++ b/drivers/gpu/drm/imx/ipuv3-plane.c
@@ -319,13 +319,14 @@ static int ipu_plane_atomic_check(struct drm_plane *plane,
                return -EINVAL;
 
        /*
-        * since we cannot touch active IDMAC channels, we do not support
-        * resizing the enabled plane or changing its format
+        * We support resizing active plane or changing its format by
+        * forcing CRTC mode change and disabling-enabling plane in plane's
+        * ->atomic_update callback.
         */
        if (old_fb && (state->src_w != old_state->src_w ||
                              state->src_h != old_state->src_h ||
                              fb->pixel_format != old_fb->pixel_format))
-               return -EINVAL;
+               crtc_state->mode_changed = true;
 
        eba = drm_plane_state_to_eba(state);
 
@@ -336,7 +337,7 @@ static int ipu_plane_atomic_check(struct drm_plane *plane,
                return -EINVAL;
 
        if (old_fb && fb->pitches[0] != old_fb->pitches[0])
-               return -EINVAL;
+               crtc_state->mode_changed = true;
 
        switch (fb->pixel_format) {
        case DRM_FORMAT_YUV420:
@@ -372,7 +373,7 @@ static int ipu_plane_atomic_check(struct drm_plane *plane,
                        return -EINVAL;
 
                if (old_fb && old_fb->pitches[1] != fb->pitches[1])
-                       return -EINVAL;
+                       crtc_state->mode_changed = true;
        }
 
        return 0;
@@ -392,8 +393,14 @@ static void ipu_plane_atomic_update(struct drm_plane *plane,
        enum ipu_color_space ics;
 
        if (old_state->fb) {
-               ipu_plane_atomic_set_base(ipu_plane, old_state);
-               return;
+               struct drm_crtc_state *crtc_state = state->crtc->state;
+
+               if (!crtc_state->mode_changed) {
+                       ipu_plane_atomic_set_base(ipu_plane, old_state);
+                       return;
+               }
+
+               ipu_disable_plane(plane);
        }
 
        switch (ipu_plane->dp_flow) {