Force a modeset if the new FB has a different format than the currently active one. While it might be possible to change between compatible formats without a full modeset as the format control is also supposed to be double buffered, the colorspace conversion is not, so when the CSC changes we need a modeset. For now just always force a modeset when the FB format changes to properly reconfigure all parts of the device for the new format. Signed-off-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx> Reviewed-by: Marek Vasut <marex@xxxxxxx> --- v3: no changes v2: fix indentation --- drivers/gpu/drm/mxsfb/lcdif_drv.c | 18 +++++++++++++++++- drivers/gpu/drm/mxsfb/lcdif_kms.c | 26 ++++++++++++++++++++------ 2 files changed, 37 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/mxsfb/lcdif_drv.c b/drivers/gpu/drm/mxsfb/lcdif_drv.c index 9df278adf3e8..667d3a4716b0 100644 --- a/drivers/gpu/drm/mxsfb/lcdif_drv.c +++ b/drivers/gpu/drm/mxsfb/lcdif_drv.c @@ -30,9 +30,25 @@ #include "lcdif_drv.h" #include "lcdif_regs.h" +static int lcdif_atomic_check(struct drm_device *dev, + struct drm_atomic_state *state) +{ + int ret; + + ret = drm_atomic_helper_check(dev, state); + if (ret) + return ret; + + /* + * Check modeset again in case crtc_state->mode_changed is + * updated in plane's ->atomic_check callback. + */ + return drm_atomic_helper_check_modeset(dev, state); +} + static const struct drm_mode_config_funcs lcdif_mode_config_funcs = { .fb_create = drm_gem_fb_create, - .atomic_check = drm_atomic_helper_check, + .atomic_check = lcdif_atomic_check, .atomic_commit = drm_atomic_helper_commit, }; diff --git a/drivers/gpu/drm/mxsfb/lcdif_kms.c b/drivers/gpu/drm/mxsfb/lcdif_kms.c index c3e31fa0335e..f98b9d8e3aa4 100644 --- a/drivers/gpu/drm/mxsfb/lcdif_kms.c +++ b/drivers/gpu/drm/mxsfb/lcdif_kms.c @@ -649,18 +649,32 @@ static const struct drm_crtc_funcs lcdif_crtc_funcs = { static int lcdif_plane_atomic_check(struct drm_plane *plane, struct drm_atomic_state *state) { - struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, - plane); + struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state, + plane); + struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(state, + plane); struct lcdif_drm_private *lcdif = to_lcdif_drm_private(plane->dev); struct drm_crtc_state *crtc_state; + int ret; + + /* always okay to disable the plane */ + if (!new_state->fb) + return 0; crtc_state = drm_atomic_get_new_crtc_state(state, &lcdif->crtc); - return drm_atomic_helper_check_plane_state(plane_state, crtc_state, - DRM_PLANE_NO_SCALING, - DRM_PLANE_NO_SCALING, - false, true); + ret = drm_atomic_helper_check_plane_state(new_state, crtc_state, + DRM_PLANE_NO_SCALING, + DRM_PLANE_NO_SCALING, + false, true); + if (ret) + return ret; + + if (old_state->fb && new_state->fb->format != old_state->fb->format) + crtc_state->mode_changed = true; + + return 0; } static void lcdif_plane_primary_atomic_update(struct drm_plane *plane, -- 2.39.2