[PATCH v4 05/17] drm/mediatek: Set DRM mode configs accordingly

[Hsiao Chien Sung]

Set DRM mode configs limitation accroding to the
hardware capabilities.

Signed-off-by: Hsiao Chien Sung <shawn.sung@xxxxxxxxxxxx>
---
 drivers/gpu/drm/mediatek/mtk_drm_drv.c | 28 ++++++++++++++++++--------
 drivers/gpu/drm/mediatek/mtk_drm_drv.h |  1 +
 2 files changed, 21 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
index 5d551bff6b3f..a4b740420ebb 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
@@ -304,6 +304,7 @@ static const struct mtk_mmsys_driver_data mt8188_vdosys0_driver_data = {
 	.conn_routes = mt8188_mtk_ddp_main_routes,
 	.conn_routes_num = ARRAY_SIZE(mt8188_mtk_ddp_main_routes),
 	.mmsys_dev_num = 2,
+	.max_pitch = GENMASK(15, 0),
 };
 
 static const struct mtk_mmsys_driver_data mt8192_mmsys_driver_data = {
@@ -318,6 +319,7 @@ static const struct mtk_mmsys_driver_data mt8195_vdosys0_driver_data = {
 	.main_path = mt8195_mtk_ddp_main,
 	.main_len = ARRAY_SIZE(mt8195_mtk_ddp_main),
 	.mmsys_dev_num = 2,
+	.max_pitch = GENMASK(15, 0),
 };
 
 static const struct mtk_mmsys_driver_data mt8195_vdosys1_driver_data = {
@@ -325,6 +327,7 @@ static const struct mtk_mmsys_driver_data mt8195_vdosys1_driver_data = {
 	.ext_len = ARRAY_SIZE(mt8195_mtk_ddp_ext),
 	.mmsys_id = 1,
 	.mmsys_dev_num = 2,
+	.max_pitch = GENMASK(15, 0),
 };
 
 static const struct of_device_id mtk_drm_of_ids[] = {
@@ -463,16 +466,16 @@ static int mtk_drm_kms_init(struct drm_device *drm)
 	if (ret)
 		goto put_mutex_dev;
 
-	drm->mode_config.min_width = 64;
-	drm->mode_config.min_height = 64;
-
 	/*
-	 * set max width and height as default value(4096x4096).
-	 * this value would be used to check framebuffer size limitation
-	 * at drm_mode_addfb().
+	 * Set default values for drm mode config
+	 * these values will be referenced by drm_mode_addfb() as
+	 * frame buffer size limitation.
 	 */
-	drm->mode_config.max_width = 4096;
-	drm->mode_config.max_height = 4096;
+	drm->mode_config.min_width = 1;
+	drm->mode_config.min_height = 1;
+	drm->mode_config.cursor_width = 512;
+	drm->mode_config.cursor_height = 512;
+
 	drm->mode_config.funcs = &mtk_drm_mode_config_funcs;
 	drm->mode_config.helper_private = &mtk_drm_mode_config_helpers;
 
@@ -502,6 +505,15 @@ static int mtk_drm_kms_init(struct drm_device *drm)
 		for (j = 0; j < private->data->mmsys_dev_num; j++) {
 			priv_n = private->all_drm_private[j];
 
+			if (priv_n->data->max_pitch) {
+				/* Save 4 bytes for the color depth (pitch = width x bpp) */
+				drm->mode_config.max_width  = priv_n->data->max_pitch >> 2;
+				drm->mode_config.max_height = priv_n->data->max_pitch >> 2;
+			} else {
+				drm->mode_config.max_width = 4096;
+				drm->mode_config.max_height = 4096;
+			}
+
 			if (i == 0 && priv_n->data->main_len) {
 				ret = mtk_drm_crtc_create(drm, priv_n->data->main_path,
 							  priv_n->data->main_len, j,
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.h b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
index d2efd715699f..3d6c1f58a7ec 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.h
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
@@ -41,6 +41,7 @@ struct mtk_mmsys_driver_data {
 	bool shadow_register;
 	unsigned int mmsys_id;
 	unsigned int mmsys_dev_num;
+	u32 max_pitch;
 };
 
 struct mtk_drm_private {
-- 
2.18.0