drm/exynos: implement display-mode-check callback in mixer driver

This patch adds the implementation of check_timing 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@samsung.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c
index c414584bfbae..cc809ca6b8ec 100644
--- a/drivers/gpu/drm/exynos/exynos_mixer.c
+++ b/drivers/gpu/drm/exynos/exynos_mixer.c
@@ -818,6 +818,29 @@ static void mixer_win_disable(void *ctx, int win)
         mixer_ctx->win_data[win].enabled = false;
 }
 
+int mixer_check_timing(void *ctx, struct fb_videomode *timing)
+{
+        struct mixer_context *mixer_ctx = ctx;
+        u32 w, h;
+
+        w = timing->xres;
+        h = timing->yres;
+
+        DRM_DEBUG_KMS("%s : xres=%d, yres=%d, refresh=%d, intl=%d\n",
+                __func__, timing->xres, timing->yres,
+                timing->refresh, (timing->vmode &
+                FB_VMODE_INTERLACED) ? true : false);
+
+        if (mixer_ctx->mxr_ver == MXR_VER_0_0_0_16)
+                return 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;
+
+        return -EINVAL;
+}
 static void mixer_wait_for_vblank(void *ctx)
 {
         struct mixer_context *mixer_ctx = ctx;
@@ -955,6 +978,9 @@ 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_timing           = mixer_check_timing,
 };
 
 static irqreturn_t mixer_irq_handler(int irq, void *arg)