[PATCH v3 1/9] video: sunxi: Add mode_valid callback to sunxi_dw_hdmi

[Andre Przywara <andre.przywara@arm.com>]

From: Jernej Skrabec <jernej.skrabec@siol.net>

Currently driver accepts all resolution which won't work on 4k screens.
Add validation callback which limits acceptable resolutions to 297 MHz.

Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
---
 drivers/video/sunxi/sunxi_dw_hdmi.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/video/sunxi/sunxi_dw_hdmi.c b/drivers/video/sunxi/sunxi_dw_hdmi.c
index 0b8cefc311e..e3811a2ec15 100644
--- a/drivers/video/sunxi/sunxi_dw_hdmi.c
+++ b/drivers/video/sunxi/sunxi_dw_hdmi.c
@@ -305,6 +305,12 @@ static int sunxi_dw_hdmi_read_edid(struct udevice *dev, u8 *buf, int buf_size)
 	return dw_hdmi_read_edid(&priv->hdmi, buf, buf_size);
 }
 
+static bool sunxi_dw_hdmi_mode_valid(struct udevice *dev,
+				     const struct display_timing *timing)
+{
+	return timing->pixelclock.typ <= 297000000;
+}
+
 static int sunxi_dw_hdmi_enable(struct udevice *dev, int panel_bpp,
 				const struct display_timing *edid)
 {
@@ -388,6 +394,7 @@ static int sunxi_dw_hdmi_probe(struct udevice *dev)
 static const struct dm_display_ops sunxi_dw_hdmi_ops = {
 	.read_edid = sunxi_dw_hdmi_read_edid,
 	.enable = sunxi_dw_hdmi_enable,
+	.mode_valid = sunxi_dw_hdmi_mode_valid,
 };
 
 U_BOOT_DRIVER(sunxi_dw_hdmi) = {
-- 
2.17.5