[PATCH RFC 05/11] drm/tilcdc: Add tilcdc_crtc_atomic_check()

[Jyri Sarha]

Add tilcdc_crtc_atomic_check(). Checks the display mode validity and
the presence of the mandatory primary plane.

Signed-off-by: Jyri Sarha <jsarha at ti.com>
---
 drivers/gpu/drm/tilcdc/tilcdc_crtc.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c 
b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
index 35f5682..2ac9d41 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
@@ -481,6 +481,34 @@ 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;
+       struct drm_display_mode *adjusted_mode = &state->adjusted_mode;
+       int ret;
+
+       if (state->state->plane_states[0]->crtc != crtc ||
+           state->state->planes[0] != crtc->primary) {
+               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;
+       }
+
+       if (!tilcdc_crtc_mode_fixup(crtc, mode, adjusted_mode)) {
+               dev_dbg(crtc->dev->dev, "Mode fixup for \"%s\" failed",
+                       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,
@@ -697,6 +725,7 @@ 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