video: tegra: dc: VGA modes in supported mode list

Add following VGA video modes in tegra_dc_hdmi_supported_modes list:

Resolution   Refresh rate(Hz)
-----------  ----------------
 640x480 	75
 720x400 	59
 800x600 	60
 800x600 	75
1024x768 	75
1024x768 	60
1152x864 	75
1280x800 	60
1280x960 	60
1280x1024 	60
1368x768 	60
1440x900 	60
1600x1200 	75
1680x1050 	60

Add CVT representation of all above modes to make sure they pass all the
HDMI constraints.
Add a new function tegra_dc_reload_mode to pick up CVT representation of
matching mode.

Bug 883911
Signed-off-by: Shashank Sharma <shashanks@nvidia.com>
Change-Id: I5227644207d38ca83a0452d3c078ef202e40a508
Reviewed-on: http://git-master/r/89126
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Kiran Adduri <kadduri@nvidia.com>
Reviewed-by: Jon Mayo <jmayo@nvidia.com>

1 files changed, 528 insertions, 1 deletions

diff --git a/drivers/video/tegra/dc/hdmi.c b/drivers/video/tegra/dc/hdmi.c
index 4cb5053d35a3..cb401a167fd4 100644
--- a/drivers/video/tegra/dc/hdmi.c
+++ b/drivers/video/tegra/dc/hdmi.c
@@ -229,6 +229,497 @@ const struct fb_videomode tegra_dc_hdmi_supported_modes[] = {
 		.vmode =	FB_VMODE_NONINTERLACED,
 		.sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 	},
+
+	/*
+	* Few VGA/SVGA modes to support monitors with lower
+	* resolutions or to support HDMI<->DVI connection
+	*/
+
+	/* 640x480p 75hz */
+	{
+		.xres =		640,
+		.yres =		480,
+		.pixclock =	KHZ2PICOS(31500),
+		.hsync_len =	96,	/* h_sync_width */
+		.vsync_len =	2,	/* v_sync_width */
+		.left_margin =	48,	/* h_back_porch */
+		.upper_margin =	32,	/* v_back_porch */
+		.right_margin =	16,	/* h_front_porch */
+		.lower_margin =	1,	/* v_front_porch */
+		.vmode =	FB_VMODE_NONINTERLACED,
+		.sync = 0,
+	},
+	/* 720x400p 59hz */
+	{
+		.xres =		720,
+		.yres =		400,
+		.pixclock =	KHZ2PICOS(35500),
+		.hsync_len =	72,	/* h_sync_width */
+		.vsync_len =	3,	/* v_sync_width */
+		.left_margin =	108,	/* h_back_porch */
+		.upper_margin =	42,	/* v_back_porch */
+		.right_margin =	36,	/* h_front_porch */
+		.lower_margin =	1,	/* v_front_porch */
+		.vmode =	FB_VMODE_NONINTERLACED,
+		.sync  = FB_SYNC_VERT_HIGH_ACT,
+	},
+	/* 800x600p 60hz */
+	{
+		.xres =		800,
+		.yres =		600,
+		.pixclock =	KHZ2PICOS(40000),
+		.hsync_len =	128,	/* h_sync_width */
+		.vsync_len =	4,	/* v_sync_width */
+		.left_margin =	88,	/* h_back_porch */
+		.upper_margin =	23,	/* v_back_porch */
+		.right_margin =	40,	/* h_front_porch */
+		.lower_margin =	1,	/* v_front_porch */
+		.vmode =	FB_VMODE_NONINTERLACED,
+		.sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
+	},
+	/* 800x600p 75hz */
+	{
+		.xres =		800,
+		.yres =		600,
+		.pixclock =	KHZ2PICOS(49500),
+		.hsync_len =	80,	/* h_sync_width */
+		.vsync_len =	2,	/* v_sync_width */
+		.left_margin =	160,	/* h_back_porch */
+		.upper_margin =	21,	/* v_back_porch */
+		.right_margin =	16,	/* h_front_porch */
+		.lower_margin =	1,	/* v_front_porch */
+		.vmode =	FB_VMODE_NONINTERLACED,
+		.sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
+	},
+	/* 1024x768p 60hz */
+	{
+		.xres =		1024,
+		.yres =		768,
+		.pixclock =	KHZ2PICOS(65000),
+		.hsync_len =	136,	/* h_sync_width */
+		.vsync_len =	6,	/* v_sync_width */
+		.left_margin =	160,	/* h_back_porch */
+		.upper_margin =	29,	/* v_back_porch */
+		.right_margin =	24,	/* h_front_porch */
+		.lower_margin =	3,	/* v_front_porch */
+		.vmode =	FB_VMODE_NONINTERLACED,
+		.sync =	0,
+	},
+	/* 1024x768p 75hz */
+	{
+		.xres =		1024,
+		.yres =		768,
+		.pixclock =	KHZ2PICOS(78800),
+		.hsync_len =	96,	/* h_sync_width */
+		.vsync_len =	3,	/* v_sync_width */
+		.left_margin =	176,	/* h_back_porch */
+		.upper_margin =	28,	/* v_back_porch */
+		.right_margin =	16,	/* h_front_porch */
+		.lower_margin =	1,	/* v_front_porch */
+		.vmode =	FB_VMODE_NONINTERLACED,
+		.sync = 0,
+	},
+	/* 1152x864p 75hz */
+	{
+		.xres =		1152,
+		.yres =		864,
+		.pixclock =	KHZ2PICOS(108000),
+		.hsync_len =	128,	/* h_sync_width */
+		.vsync_len =	3,	/* v_sync_width */
+		.left_margin =	256,	/* h_back_porch */
+		.upper_margin =	32,	/* v_back_porch */
+		.right_margin =	64,	/* h_front_porch */
+		.lower_margin =	1,	/* v_front_porch */
+		.vmode =	FB_VMODE_NONINTERLACED,
+		.sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
+	},
+	/* 1280x800p 60hz */
+	{
+		.xres =		1280,
+		.yres =		800,
+		.pixclock =	KHZ2PICOS(83460),
+		.hsync_len =	136,	/* h_sync_width */
+		.vsync_len =	3,	/* v_sync_width */
+		.left_margin =	200,	/* h_back_porch */
+		.upper_margin =	24,	/* v_back_porch */
+		.right_margin =	64,	/* h_front_porch */
+		.lower_margin =	1,	/* v_front_porch */
+		.vmode =	FB_VMODE_NONINTERLACED,
+		.sync =		FB_SYNC_VERT_HIGH_ACT,
+	},
+	/* 1280x960p 60hz */
+	{
+		.xres =		1280,
+		.yres =		960,
+		.pixclock =	KHZ2PICOS(108000),
+		.hsync_len =	136,	/* h_sync_width */
+		.vsync_len =	3,	/* v_sync_width */
+		.left_margin =	216,	/* h_back_porch */
+		.upper_margin =	30,	/* v_back_porch */
+		.right_margin =	80,	/* h_front_porch */
+		.lower_margin =	1,	/* v_front_porch */
+		.vmode =	FB_VMODE_NONINTERLACED,
+		.sync =		FB_SYNC_VERT_HIGH_ACT,
+	},
+	/* 1280x1024p 60hz */
+	{
+		.xres =		1280,
+		.yres =		1024,
+		.pixclock =	KHZ2PICOS(108000),
+		.hsync_len =	112,	/* h_sync_width */
+		.vsync_len =	3,	/* v_sync_width */
+		.left_margin =	248,	/* h_back_porch */
+		.upper_margin =	38,	/* v_back_porch */
+		.right_margin =	48,	/* h_front_porch */
+		.lower_margin =	1,	/* v_front_porch */
+		.vmode =	FB_VMODE_NONINTERLACED,
+		.sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
+	},
+	/* 1280x1024p 75hz */
+	{
+		.xres =		1280,
+		.yres =		1024,
+		.pixclock =	KHZ2PICOS(135000),
+		.hsync_len =	144,	/* h_sync_width */
+		.vsync_len =	3,	/* v_sync_width */
+		.left_margin =	248,	/* h_back_porch */
+		.upper_margin =	38,	/* v_back_porch */
+		.right_margin =	16,	/* h_front_porch */
+		.lower_margin =	1,	/* v_front_porch */
+		.vmode =	FB_VMODE_NONINTERLACED,
+		.sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
+	},
+	/* 1368x768p 60hz */
+	{
+		.xres =		1368,
+		.yres =		768,
+		.pixclock =	KHZ2PICOS(85860),
+		.hsync_len =	144,	/* h_sync_width */
+		.vsync_len =	3,	/* v_sync_width */
+		.left_margin =	216,	/* h_back_porch */
+		.upper_margin =	23,	/* v_back_porch */
+		.right_margin =	72,	/* h_front_porch */
+		.lower_margin =	1,	/* v_front_porch */
+		.vmode =	FB_VMODE_NONINTERLACED,
+		.sync =		FB_SYNC_VERT_HIGH_ACT,
+	},
+	/* 1440x900p 60hz */
+	{
+		.xres =		1440,
+		.yres =		900,
+		.pixclock =	KHZ2PICOS(106470),
+		.hsync_len =	152,	/* h_sync_width */
+		.vsync_len =	3,	/* v_sync_width */
+		.left_margin =	232,	/* h_back_porch */
+		.upper_margin =	28,	/* v_back_porch */
+		.right_margin =	80,	/* h_front_porch */
+		.lower_margin =	1,	/* v_front_porch */
+		.vmode =	FB_VMODE_NONINTERLACED,
+		.sync =		FB_SYNC_VERT_HIGH_ACT,
+	},
+	/* 1600x1200p 60hz */
+	{
+		.xres =		1600,
+		.yres =		1200,
+		.pixclock =	KHZ2PICOS(162000),
+		.hsync_len =	192,	/* h_sync_width */
+		.vsync_len =	3,	/* v_sync_width */
+		.left_margin =	304,	/* h_back_porch */
+		.upper_margin =	46,	/* v_back_porch */
+		.right_margin =	64,	/* h_front_porch */
+		.lower_margin =	1,	/* v_front_porch */
+		.vmode =	FB_VMODE_NONINTERLACED,
+		.sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
+	},
+	/* 1600x1200p 75hz */
+	{
+		.xres =		1600,
+		.yres =		1200,
+		.pixclock =	KHZ2PICOS(202500),
+		.hsync_len =	192,	/* h_sync_width */
+		.vsync_len =	3,	/* v_sync_width */
+		.left_margin =	304,	/* h_back_porch */
+		.upper_margin =	46,	/* v_back_porch */
+		.right_margin =	64,	/* h_front_porch */
+		.lower_margin =	1,	/* v_front_porch */
+		.vmode =	FB_VMODE_NONINTERLACED,
+		.sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
+	},
+	/* 1680x1050p 59.94/60hz */
+	{
+		.xres =		1680,
+		.yres =		1050,
+		.pixclock =	KHZ2PICOS(147140),
+		.hsync_len =	184,	/* h_sync_width */
+		.vsync_len =	3,	/* v_sync_width */
+		.left_margin =	288,	/* h_back_porch */
+		.upper_margin =	33,	/* v_back_porch */
+		.right_margin =	104,	/* h_front_porch */
+		.lower_margin =	1,	/* v_front_porch */
+		.vmode =	FB_VMODE_NONINTERLACED,
+		.sync =	FB_SYNC_VERT_HIGH_ACT,
+	},
+};
+
+/* CVT timing representation of VESA modes*/
+const struct fb_videomode tegra_dc_hdmi_supported_cvt_modes[] = {
+
+	/* 640x480p 60hz */
+	{
+		.refresh =	60,
+		.xres =		640,
+		.yres =		480,
+		.pixclock =	KHZ2PICOS(23750),
+		.hsync_len =	64,	/* h_sync_width */
+		.vsync_len =	4,	/* v_sync_width */
+		.left_margin =	80,	/* h_back_porch */
+		.upper_margin =	17,	/* v_back_porch */
+		.right_margin =	16,	/* h_front_porch */
+		.lower_margin =	3,	/* v_front_porch */
+		.vmode =	FB_VMODE_NONINTERLACED,
+		.sync = FB_SYNC_VERT_HIGH_ACT,
+	},
+	/* 640x480p 75hz */
+	{
+		.refresh =	75,
+		.xres =		640,
+		.yres =		480,
+		.pixclock =	KHZ2PICOS(30750),
+		.hsync_len =	64,	/* h_sync_width */
+		.vsync_len =	4,	/* v_sync_width */
+		.left_margin =	88,	/* h_back_porch */
+		.upper_margin =	21,	/* v_back_porch */
+		.right_margin =	24,	/* h_front_porch */
+		.lower_margin =	3,	/* v_front_porch */
+		.vmode =	FB_VMODE_NONINTERLACED,
+		.sync = FB_SYNC_VERT_HIGH_ACT,
+	},
+	/* 720x400p 59hz */
+	{
+		.refresh =	59,
+		.xres =		720,
+		.yres =		400,
+		.pixclock =	KHZ2PICOS(22000),
+		.hsync_len =	64,	/* h_sync_width */
+		.vsync_len =	10,	/* v_sync_width */
+		.left_margin =	88,	/* h_back_porch */
+		.upper_margin =	14,	/* v_back_porch */
+		.right_margin =	24,	/* h_front_porch */
+		.lower_margin =	3,	/* v_front_porch */
+		.vmode =	FB_VMODE_NONINTERLACED,
+		.sync  = FB_SYNC_VERT_HIGH_ACT,
+	},
+	/* 800x600p 60hz */
+	{
+		.refresh =	60,
+		.xres =		800,
+		.yres =		600,
+		.pixclock =	KHZ2PICOS(38250),
+		.hsync_len =	80,	/* h_sync_width */
+		.vsync_len =	4,	/* v_sync_width */
+		.left_margin =	112,	/* h_back_porch */
+		.upper_margin =	21,	/* v_back_porch */
+		.right_margin =	32,	/* h_front_porch */
+		.lower_margin =	3,	/* v_front_porch */
+		.vmode =	FB_VMODE_NONINTERLACED,
+		.sync = 	FB_SYNC_VERT_HIGH_ACT,
+	},
+	/* 800x600p 75hz */
+	{
+		.refresh =	75,
+		.xres =		800,
+		.yres =		600,
+		.pixclock =	KHZ2PICOS(49000),
+		.hsync_len =	80,	/* h_sync_width */
+		.vsync_len =	4,	/* v_sync_width */
+		.left_margin =	120,	/* h_back_porch */
+		.upper_margin =	26,	/* v_back_porch */
+		.right_margin =	40,	/* h_front_porch */
+		.lower_margin =	3,	/* v_front_porch */
+		.vmode =	FB_VMODE_NONINTERLACED,
+		.sync = FB_SYNC_VERT_HIGH_ACT,
+	},
+	/* 1024x768p 60hz */
+	{
+		.refresh =	60,
+		.xres =		1024,
+		.yres =		768,
+		.pixclock =	KHZ2PICOS(63500),
+		.hsync_len =	104,	/* h_sync_width */
+		.vsync_len =	4,	/* v_sync_width */
+		.left_margin =	152,	/* h_back_porch */
+		.upper_margin =	27,	/* v_back_porch */
+		.right_margin =	48,	/* h_front_porch */
+		.lower_margin =	3,	/* v_front_porch */
+		.vmode =	FB_VMODE_NONINTERLACED,
+		.sync =	FB_SYNC_VERT_HIGH_ACT,
+	},
+	/* 1024x768p 75hz */
+	{
+		.refresh =	75,
+		.xres =		1024,
+		.yres =		768,
+		.pixclock =	KHZ2PICOS(82000),
+		.hsync_len =	104,	/* h_sync_width */
+		.vsync_len =	4,	/* v_sync_width */
+		.left_margin =	168,	/* h_back_porch */
+		.upper_margin =	34,	/* v_back_porch */
+		.right_margin =	64,	/* h_front_porch */
+		.lower_margin =	3,	/* v_front_porch */
+		.vmode =	FB_VMODE_NONINTERLACED,
+		.sync = FB_SYNC_VERT_HIGH_ACT,
+	},
+	/* 1152x864p 75hz */
+	{
+		.refresh =	75,
+		.xres =		1152,
+		.yres =		864,
+		.pixclock =	KHZ2PICOS(104500),
+		.hsync_len =	120,	/* h_sync_width */
+		.vsync_len =	10,	/* v_sync_width */
+		.left_margin =	192,	/* h_back_porch */
+		.upper_margin =	38,	/* v_back_porch */
+		.right_margin =	72,	/* h_front_porch */
+		.lower_margin =	3,	/* v_front_porch */
+		.vmode =	FB_VMODE_NONINTERLACED,
+		.sync = FB_SYNC_VERT_HIGH_ACT,
+	},
+	/* 1280x800p 60hz */
+	{
+		.refresh =	60,
+		.xres =		1280,
+		.yres =		800,
+		.pixclock =	KHZ2PICOS(83500),
+		.hsync_len =	128,	/* h_sync_width */
+		.vsync_len =	6,	/* v_sync_width */
+		.left_margin =	200,	/* h_back_porch */
+		.upper_margin =	28,	/* v_back_porch */
+		.right_margin =	72,	/* h_front_porch */
+		.lower_margin =	3,	/* v_front_porch */
+		.vmode =	FB_VMODE_NONINTERLACED,
+		.sync =		FB_SYNC_VERT_HIGH_ACT,
+	},
+	/* 1280x960p 60hz */
+	{
+		.refresh =	60,
+		.xres =		1280,
+		.yres =		960,
+		.pixclock =	KHZ2PICOS(101250),
+		.hsync_len =	128,	/* h_sync_width */
+		.vsync_len =	4,	/* v_sync_width */
+		.left_margin =	208,	/* h_back_porch */
+		.upper_margin =	33,	/* v_back_porch */
+		.right_margin =	80,	/* h_front_porch */
+		.lower_margin =	3,	/* v_front_porch */
+		.vmode =	FB_VMODE_NONINTERLACED,
+		.sync = FB_SYNC_VERT_HIGH_ACT,
+	},
+	/* 1280x1024p 60hz */
+	{
+		.refresh =	60,
+		.xres =		1280,
+		.yres =		1024,
+		.pixclock =	KHZ2PICOS(109000),
+		.hsync_len =	136,	/* h_sync_width */
+		.vsync_len =	7,	/* v_sync_width */
+		.left_margin =	216,	/* h_back_porch */
+		.upper_margin =	36,	/* v_back_porch */
+		.right_margin =	80,	/* h_front_porch */
+		.lower_margin =	3,	/* v_front_porch */
+		.vmode =	FB_VMODE_NONINTERLACED,
+		.sync =	FB_SYNC_VERT_HIGH_ACT,
+	},
+
+	/* 1280x1024p 75hz */
+	{
+		.refresh =	75,
+		.xres =		1280,
+		.yres =		1024,
+		.pixclock =	KHZ2PICOS(138750),
+		.hsync_len =	136,	/* h_sync_width */
+		.vsync_len =	7,	/* v_sync_width */
+		.left_margin =	224,	/* h_back_porch */
+		.upper_margin =	45,	/* v_back_porch */
+		.right_margin =	88,	/* h_front_porch */
+		.lower_margin =	3,	/* v_front_porch */
+		.vmode =	FB_VMODE_NONINTERLACED,
+		.sync = FB_SYNC_VERT_HIGH_ACT,
+	},
+	/* 1368x768p 60hz */
+	{
+		.refresh =	60,
+		.xres =		1368,
+		.yres =		768,
+		.pixclock =	KHZ2PICOS(85250),
+		.hsync_len =	136,	/* h_sync_width */
+		.vsync_len =	10,	/* v_sync_width */
+		.left_margin =	208,	/* h_back_porch */
+		.upper_margin =	27,	/* v_back_porch */
+		.right_margin =	72,	/* h_front_porch */
+		.lower_margin =	3,	/* v_front_porch */
+		.vmode =	FB_VMODE_NONINTERLACED,
+		.sync =		FB_SYNC_VERT_HIGH_ACT,
+	},
+	/* 1440x900p 60hz */
+	{
+		.refresh =	60,
+		.xres =		1440,
+		.yres =		900,
+		.pixclock =	KHZ2PICOS(106500),
+		.hsync_len =	152,	/* h_sync_width */
+		.vsync_len =	6,	/* v_sync_width */
+		.left_margin =	232,	/* h_back_porch */
+		.upper_margin =	31,	/* v_back_porch */
+		.right_margin =	80,	/* h_front_porch */
+		.lower_margin =	3,	/* v_front_porch */
+		.vmode =	FB_VMODE_NONINTERLACED,
+		.sync =		FB_SYNC_VERT_HIGH_ACT,
+	},
+	/* 1600x1200p 60hz */
+	{
+		.refresh =	60,
+		.xres =		1600,
+		.yres =		1200,
+		.pixclock =	KHZ2PICOS(161000),
+		.hsync_len =	168,	/* h_sync_width */
+		.vsync_len =	4,	/* v_sync_width */
+		.left_margin =	280,	/* h_back_porch */
+		.upper_margin =	42,	/* v_back_porch */
+		.right_margin =	112,	/* h_front_porch */
+		.lower_margin =	3,	/* v_front_porch */
+		.vmode =	FB_VMODE_NONINTERLACED,
+		.sync = FB_SYNC_VERT_HIGH_ACT,
+	},
+	/* 1600x1200p 75hz */
+	{
+		.refresh =	75,
+		.xres =		1600,
+		.yres =		1200,
+		.pixclock =	KHZ2PICOS(204750),
+		.hsync_len =	168,	/* h_sync_width */
+		.vsync_len =	4,	/* v_sync_width */
+		.left_margin =	288,	/* h_back_porch */
+		.upper_margin =	52,	/* v_back_porch */
+		.right_margin =	120,	/* h_front_porch */
+		.lower_margin =	3,	/* v_front_porch */
+		.vmode =	FB_VMODE_NONINTERLACED,
+		.sync = FB_SYNC_VERT_HIGH_ACT,
+	},
+	/* 1680x1050p 59.94/60hz */
+	{
+		.refresh =	60,
+		.xres =		1680,
+		.yres =		1050,
+		.pixclock =	KHZ2PICOS(140000),
+		.hsync_len =	168,	/* h_sync_width */
+		.vsync_len =	10,	/* v_sync_width */
+		.left_margin =	272,	/* h_back_porch */
+		.upper_margin =	36,	/* v_back_porch */
+		.right_margin =	104,	/* h_front_porch */
+		.lower_margin =	3,	/* v_front_porch */
+		.vmode =	FB_VMODE_NONINTERLACED,
+		.sync =	FB_SYNC_VERT_HIGH_ACT,
+	},
 };
 
 /* table of electrical settings, must be in acending order. */
@@ -710,6 +1201,30 @@ static bool tegra_dc_hdmi_valid_pixclock(const struct tegra_dc *dc,
 	}
 }
 
+static bool tegra_dc_cvt_mode_equal(const struct fb_videomode *mode1,
+				const struct fb_videomode *mode2)
+{
+	return (mode1->xres == mode2->xres &&
+		mode1->yres == mode2->yres &&
+		mode1->refresh == mode2->refresh &&
+		mode1->vmode == mode2->vmode);
+}
+
+static bool tegra_dc_reload_mode(struct fb_videomode *mode)
+{
+	int i = 0;
+	for (i = 0; i < ARRAY_SIZE(tegra_dc_hdmi_supported_cvt_modes); i++) {
+		const struct fb_videomode *cvt_mode
+				= &tegra_dc_hdmi_supported_cvt_modes[i];
+		if (tegra_dc_cvt_mode_equal(cvt_mode, mode)) {
+			memcpy(mode, cvt_mode, sizeof(*mode));
+			return true;
+		}
+	}
+	return false;
+}
+
+
 static bool tegra_dc_hdmi_mode_filter(const struct tegra_dc *dc,
 					struct fb_videomode *mode)
 {
@@ -729,7 +1244,19 @@ static bool tegra_dc_hdmi_mode_filter(const struct tegra_dc *dc,
 				= &tegra_dc_hdmi_supported_modes[i];
 		if (tegra_dc_hdmi_mode_equal(supported_mode, mode) &&
 		    tegra_dc_hdmi_valid_pixclock(dc, supported_mode)) {
-			memcpy(mode, supported_mode, sizeof(*mode));
+			if (mode->lower_margin == 1) {
+				/* This might be the case for HDMI<->DVI
+				 * where std VESA representation will not
+				 * pass constraint V_FRONT_PORCH >=
+				 * V_REF_TO_SYNC + 1.So reload mode in
+				 * CVT timing standards.
+				 */
+				if (!tegra_dc_reload_mode(mode))
+					return false;
+			}
+			else
+				memcpy(mode, supported_mode, sizeof(*mode));
+
 			mode->flag = FB_MODE_IS_DETAILED;
 			clock_per_frame = tegra_dc_calc_clock_per_frame(mode);
 			mode->refresh = (PICOS2KHZ(mode->pixclock) * 1000)