[PATCH v4] imx-drm: Add mx6 hdmi transmitter support

On 10/31/2013 1:23 PM, Troy Kisky wrote:

+/* Workaround to clear the overflow condition */
+static void imx_hdmi_clear_overflow(struct imx_hdmi *hdmi)
+{
+    int count;
+    u8 val;
+
+    /* TMDS software reset */
+    hdmi_writeb(hdmi, (u8)~HDMI_MC_SWRSTZ_TMDSSWRST_REQ, 
HDMI_MC_SWRSTZ);
+
+    val = hdmi_readb(hdmi, HDMI_FC_INVIDCONF);
+    if (hdmi->dev_type == IMX6DL_HDMI) {
+        hdmi_writeb(hdmi, val, HDMI_FC_INVIDCONF);
+        return;
+    }
+
+    for (count = 0; count < 5; count++)
+        hdmi_writeb(hdmi, val, HDMI_FC_INVIDCONF);
+}
+

Hi Fabio,

I get a magenta line down the left side of the screen unless I replace 
the 5 with a 6.
ie.

+    for (count = 0; count < 6; count++)
+        hdmi_writeb(hdmi, val, HDMI_FC_INVIDCONF);


This is with a imx6q processor. With the 6, the picture looks great!

Troy

It also works if I change the 5 to a 4! A 3 fails though.
To summarize:
0 works
1 fails
2 works
3 fails
4 works
5 fails
6 works
Very strange.

Troy