[media] adv7842: Disable access to EDID DDC lines before chip power up

In core_init make sure access to EDID DDC lines are disabled
before chip is powered up. Also DISABLE_AUTO_EDID before power up.
The correct setting is applied later when setting the EDID.
Some sources (MAC) kept on reading EDID even when Hotplug was low
and in the short period in core_init before the DDC lines was enabled
read a corrupt EDID.

Signed-off-by: Martin Bugge <marbugge@cisco.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

diff --git a/drivers/media/i2c/adv7842.c b/drivers/media/i2c/adv7842.c
index 5d79c57f65d42d5ed5fddaa869b3e6f5aa7c8f23..06c25c3fa3a95cc36dcf75de2b4e63d7deaccc03 100644 (file)
--- a/drivers/media/i2c/adv7842.c
+++ b/drivers/media/i2c/adv7842.c
@@ -2611,6 +2611,12 @@ static int adv7842_core_init(struct v4l2_subdev *sd)
 
        disable_input(sd);
 
+       /*
+        * Disable I2C access to internal EDID ram from HDMI DDC ports
+        * Disable auto edid enable when leaving powerdown mode
+        */
+       rep_write_and_or(sd, 0x77, 0xd3, 0x20);
+
        /* power */
        io_write(sd, 0x0c, 0x42);   /* Power up part and power down VDP */
        io_write(sd, 0x15, 0x80);   /* Power up pads */
@@ -2691,9 +2697,6 @@ static int adv7842_core_init(struct v4l2_subdev *sd)
 
        enable_input(sd);
 
-       /* disable I2C access to internal EDID ram from HDMI DDC ports */
-       rep_write_and_or(sd, 0x77, 0xf3, 0x00);
-
        if (pdata->hpa_auto) {
                /* HPA auto, HPA 0.5s after Edid set and Cable detect */
                hdmi_write(sd, 0x69, 0x5c);