From mboxrd@z Thu Jan  1 00:00:00 1970
From: troy.kisky@boundarydevices.com (Troy Kisky)
Date: Thu, 31 Oct 2013 13:38:56 -0700
Subject: [PATCH v4] imx-drm: Add mx6 hdmi transmitter support
In-Reply-To: <5272BC59.1080109@boundarydevices.com>
References: <1383181127-12013-1-git-send-email-festevam@gmail.com>
 <5272BC59.1080109@boundarydevices.com>
Message-ID: <5272BFE0.5040409@boundarydevices.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

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