imx-drm: ipuv3-crtc: Implement mode_fixup

Ask the IPU display interface, via ipu_di_adjust_videomode(), to
adjust a video mode to meet any DI restrictions. The function takes
a subsystem independent videomode, so the drm_display_mode must be
converted to videomode first, and then the adjusted mode converted
back to a drm_display_mode.

Signed-off-by: Steve Longerbeam <steve_longerbeam@mentor.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/gpu/drm/imx/ipuv3-crtc.c b/drivers/gpu/drm/imx/ipuv3-crtc.c
index ebee59cb96d8..23d69ecb62dd 100644
--- a/drivers/gpu/drm/imx/ipuv3-crtc.c
+++ b/drivers/gpu/drm/imx/ipuv3-crtc.c
@@ -237,6 +237,18 @@ static bool ipu_crtc_mode_fixup(struct drm_crtc *crtc,
                                   const struct drm_display_mode *mode,
                                   struct drm_display_mode *adjusted_mode)
 {
+        struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
+        struct videomode vm;
+        int ret;
+
+        drm_display_mode_to_videomode(adjusted_mode, &vm);
+
+        ret = ipu_di_adjust_videomode(ipu_crtc->di, &vm);
+        if (ret)
+                return false;
+
+        drm_display_mode_from_videomode(&vm, adjusted_mode);
+
         return true;
 }