Add tilcdc_crtc_atomic_check(). Checks the display mode validity and
the presence of the mandatory primary plane.
The drm_crtc_helper_funcs mode_fixup() callback is left untouched and
the check function does no try to do its job on purpose, despite what
the mode_fixup() callback's documentations suggests.
The plane's check() callback needs to set drm_crtc_state's
->mode_changed to true if the pixel format for the framebuffer
changes. Because of this drm_mode_config_funcs atomic_check() callback
needs to call drm_atomic_helper_check_modeset() once more after it has
called drm_atomic_helper_check_planes(). If the fixing of the
adjusted_mode would be done in drm_crtc_helper_funcs atomic_check()
callback, it would get over written by the extra
drm_atomic_helper_check_modeset() call.
Signed-off-by: Jyri Sarha <jsarha@xxxxxx>
---
drivers/gpu/drm/tilcdc/tilcdc_crtc.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
index 5b692c5..4787e4a 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
@@ -474,6 +474,32 @@ static void tilcdc_crtc_mode_set_nofb(struct drm_crtc *crtc)
crtc->hwmode = crtc->state->adjusted_mode;
}
+static int tilcdc_crtc_atomic_check(struct drm_crtc *crtc,
+ struct drm_crtc_state *state)
+{
+ struct drm_display_mode *mode = &state->mode;
+ int ret;
+
+ /* If we are not active we don't care */
+ if (!state->active)
+ return 0;
+
+ if (state->state->planes[0].ptr != crtc->primary ||
+ state->state->planes[0].state == NULL ||
+ state->state->planes[0].state->crtc != crtc) {
+ dev_dbg(crtc->dev->dev, "CRTC primary plane must be present");
+ return -EINVAL;
+ }
+
+ ret = tilcdc_crtc_mode_valid(crtc, mode);
+ if (ret) {
+ dev_dbg(crtc->dev->dev, "Mode \"%s\" not valid", mode->name);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
static int tilcdc_crtc_mode_set(struct drm_crtc *crtc,
struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode,
@@ -690,6 +716,7 @@ static const struct drm_crtc_helper_funcs tilcdc_crtc_helper_funcs = {
.commit = tilcdc_crtc_commit,
.mode_set = tilcdc_crtc_mode_set,
.mode_set_base = tilcdc_crtc_mode_set_base,
+ .atomic_check = tilcdc_crtc_atomic_check,
.mode_set_nofb = tilcdc_crtc_mode_set_nofb,
};
--
1.9.1
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