[PATCH 7/7] ARM i.MX51 babbage: Add display support

[Fabio Estevam]

On Tue, Jan 8, 2013 at 2:41 PM, Fabio Estevam <festevam at gmail.com> wrote:
> Hi Sascha,
>
> On Mon, Nov 12, 2012 at 1:23 PM, Sascha Hauer <s.hauer at pengutronix.de> wrote:
>> The babbage board has a DVI-I output which allows to output analog
>> and digital signals simultaneously. This patch adds support for it
>> to the devicetree. The DDC signals are not wired up on the board, so
>> DRM will fall back on default VESA modes.
>>
>> Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
>
> I am running linux-next 20130108, which has this patch applied and I
> get the following on my mx51babbage:

Ok, good news. I see a nice penguin on my monitor now.

Discussed with Marek and he proposed a quick workaround:

--- a/drivers/staging/imx-drm/ipuv3-crtc.c
+++ b/drivers/staging/imx-drm/ipuv3-crtc.c
@@ -343,6 +343,11 @@ static irqreturn_t ipu_irq_handler(int irq, void *dev_id)
 {
        struct ipu_crtc *ipu_crtc = dev_id;

+       if (!ipu_crtc->imx_crtc) {
+               pr_err("Spurious IPU IRQ\n");
+               return IRQ_HANDLED;
+       }
+
        imx_drm_handle_vblank(ipu_crtc->imx_crtc);

        if (ipu_crtc->newfb) {

It seems that this issue happened because bootloader leaves the IPU turned on.

Thanks,

Fabio Estevam