[PATCH 56/59] kmb/drm: Prune unsupported modes

[Anitha Chrisanthus <anitha.chrisanthus@xxxxxxxxx>]

KMB display pipeline is LCD->Mipi->HDMI. Mipi->HDMI converter chip only
accepts 4-lane input from mipi.
With 4-lane mipi, KMB hardware can only support 1080p resolution.
Therefore, limit supported mode to 1080p.

Signed-off-by: Anitha Chrisanthus <anitha.chrisanthus@xxxxxxxxx>
Reviewed-by: Bob Paauwe <bob.j.paauwe@xxxxxxxxx>
---
 drivers/gpu/drm/kmb/kmb_drv.c   |  4 ++--
 drivers/gpu/drm/kmb/kmb_drv.h   |  8 +++++---
 drivers/gpu/drm/kmb/kmb_dsi.c   | 11 +++++++++++
 drivers/gpu/drm/kmb/kmb_plane.c |  2 ++
 4 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/kmb/kmb_drv.c b/drivers/gpu/drm/kmb/kmb_drv.c
index f8894d3..68e7b5c 100644
--- a/drivers/gpu/drm/kmb/kmb_drv.c
+++ b/drivers/gpu/drm/kmb/kmb_drv.c
@@ -359,8 +359,8 @@ static const struct drm_mode_config_funcs kmb_mode_config_funcs = {
 static void kmb_setup_mode_config(struct drm_device *drm)
 {
 	drm_mode_config_init(drm);
-	drm->mode_config.min_width = 0;
-	drm->mode_config.min_height = 0;
+	drm->mode_config.min_width = KMB_MIN_WIDTH;
+	drm->mode_config.min_height = KMB_MIN_HEIGHT;
 	drm->mode_config.max_width = KMB_MAX_WIDTH;
 	drm->mode_config.max_height = KMB_MAX_HEIGHT;
 	drm->mode_config.funcs = &kmb_mode_config_funcs;
diff --git a/drivers/gpu/drm/kmb/kmb_drv.h b/drivers/gpu/drm/kmb/kmb_drv.h
index 83824f7..eef2d8b 100644
--- a/drivers/gpu/drm/kmb/kmb_drv.h
+++ b/drivers/gpu/drm/kmb/kmb_drv.h
@@ -28,10 +28,12 @@
 
 #include "kmb_regs.h"
 
-#define FCCTEST
+//#define FCCTEST
 #define LCD_TEST
-#define KMB_MAX_WIDTH			1920	/*max width in pixels */
-#define KMB_MAX_HEIGHT			1080	/*max height in pixels */
+#define KMB_MAX_WIDTH			1920 /*max width in pixels */
+#define KMB_MAX_HEIGHT			1080 /*max height in pixels */
+#define KMB_MIN_WIDTH                   1920 /*max width in pixels */
+#define KMB_MIN_HEIGHT                  1080 /*max height in pixels */
 #define KMB_LCD_DEFAULT_CLK		250000000
 #define KMB_MIPI_DEFAULT_CLK		24000000
 #define KMB_MIPI_DEFAULT_CFG_CLK	24000000
diff --git a/drivers/gpu/drm/kmb/kmb_dsi.c b/drivers/gpu/drm/kmb/kmb_dsi.c
index 8a12d6d..ec974da 100644
--- a/drivers/gpu/drm/kmb/kmb_dsi.c
+++ b/drivers/gpu/drm/kmb/kmb_dsi.c
@@ -216,6 +216,17 @@ static enum drm_mode_status
 kmb_dsi_mode_valid(struct drm_connector *connector,
 		   struct drm_display_mode *mode)
 {
+	struct drm_device *dev = connector->dev;
+	struct drm_mode_config *mode_config = &dev->mode_config;
+
+	if (mode->hdisplay < mode_config->min_width ||
+			mode->hdisplay > mode_config->max_width)
+		return MODE_BAD_HVALUE;
+
+	if (mode->vdisplay < mode_config->min_height ||
+			mode->vdisplay > mode_config->max_height)
+		return MODE_BAD_VVALUE;
+
 	return MODE_OK;
 }
 
diff --git a/drivers/gpu/drm/kmb/kmb_plane.c b/drivers/gpu/drm/kmb/kmb_plane.c
index 81250e1..5e040f7 100644
--- a/drivers/gpu/drm/kmb/kmb_plane.c
+++ b/drivers/gpu/drm/kmb/kmb_plane.c
@@ -77,6 +77,8 @@ static int kmb_plane_atomic_check(struct drm_plane *plane,
 
 	if (state->crtc_w > KMB_MAX_WIDTH || state->crtc_h > KMB_MAX_HEIGHT)
 		return -EINVAL;
+	if (state->crtc_w < KMB_MIN_WIDTH || state->crtc_h < KMB_MIN_HEIGHT)
+		return -EINVAL;
 	return 0;
 }
 
-- 
2.7.4

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