[PATCH 2/4] drm/exynos: implement display-mode-check callback in mixer driver

[Rahul Sharma]

This patch adds the implementation of check_mode callback in the mixer
driver. Based on the mixer version, correct set of restrictions will be
exposed by the mixer driver. A resolution will be acceptable only if passes
the criteria set by mixer and hdmi IPs.

Signed-off-by: Rahul Sharma <rahul.sharma at samsung.com>
Signed-off-by: Sean Paul <seanpaul at chromium.org>
---
 drivers/gpu/drm/exynos/exynos_mixer.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c
index 21db895..093b374 100644
--- a/drivers/gpu/drm/exynos/exynos_mixer.c
+++ b/drivers/gpu/drm/exynos/exynos_mixer.c
@@ -810,6 +810,33 @@ static void mixer_win_disable(void *ctx, int win)
 	mixer_ctx->win_data[win].enabled = false;
 }
 
+int mixer_check_mode(void *ctx, void *mode)
+{
+	struct mixer_context *mixer_ctx = ctx;
+	struct fb_videomode *check_mode = mode;
+	unsigned int w, h;
+
+	w = check_mode->xres;
+	h = check_mode->yres;
+
+	DRM_DEBUG_KMS("%s : xres=%d, yres=%d, refresh=%d, intl=%d\n",
+		__func__, check_mode->xres, check_mode->yres,
+		check_mode->refresh, (check_mode->vmode &
+		FB_VMODE_INTERLACED) ? true : false);
+
+	if (mixer_ctx->mxr_ver == MXR_VER_16_0_33_0) {
+		if ((w >= 464 && w <= 720 && h >= 261 && h <= 576) ||
+			(w >= 1024 && w <= 1280 &&
+				h >= 576 && h <= 720) ||
+			(w >= 1664 && w <= 1920 &&
+				h >= 936 && h <= 1080))
+				return 0;
+	} else {
+		return 0;
+	}
+
+	return -EINVAL;
+}
 static void mixer_wait_for_vblank(void *ctx)
 {
 	struct mixer_context *mixer_ctx = ctx;
@@ -947,6 +974,9 @@ static struct exynos_mixer_ops mixer_ops = {
 	.win_mode_set		= mixer_win_mode_set,
 	.win_commit		= mixer_win_commit,
 	.win_disable		= mixer_win_disable,
+
+	/* display */
+	.check_mode	= mixer_check_mode,
 };
 
 /* for pageflip event */
-- 
1.8.0