[U-Boot] [PATCH] video: arm: rpi: Avoid crash without HDMI monitor connected

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

On Fri, 26 Jul 2019 13:35:26 +0000
Matthias Brugger <mbrugger@suse.com> wrote:

> On 26/07/2019 14:54, Andre Przywara wrote:
> > Before we use random pointers that bcm2835_set_video_params() is
> > supposed to populate, we should check its return value, which could
> > indicate that the function bailed out early. This happend when there
> > is no monitor connected.
> > 
> > That fixes a horrible crash when just booting with a serial console.  
> 
> Can you test this patch?
> https://patchwork.ozlabs.org/patch/1130837/
> 
> It should fix your issue.

Yes, of course it does. Sorry that I missed that email, just replied to
that as well.

> By the way which version of the FW do you use?

Some older one, I guess. I downloaded some image on the day the board was announced.

Btw: I run this with ATF as armstub8.bin, which gives me PSCI, errata fixes and the ability to tweak the DT:
https://github.com/Andre-ARM/arm-trusted-firmware/commits/rpi4
That works with the kernel or U-Boot as kernel8.img.
The upstreaming discussion is happening on the official Gerrit (yikes!) server:
https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/1629

Cheers,
Andre

> > Signed-off-by: Andre Przywara <andre.przywara@arm.com>
> > ---
> > Hi,
> > 
> > I saw this on the RPi4 (with Andrei's v2 series), but it looks like this
> > would happen on the other boards as well.
> > 
> > Cheers,
> > Andre.
> > 
> >  drivers/video/bcm2835.c | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/drivers/video/bcm2835.c b/drivers/video/bcm2835.c
> > index bc41090aed..4188a94cba 100644
> > --- a/drivers/video/bcm2835.c
> > +++ b/drivers/video/bcm2835.c
> > @@ -26,6 +26,8 @@ static int bcm2835_video_probe(struct udevice *dev)
> >  	ret = bcm2835_set_video_params(&w, &h, 32, BCM2835_MBOX_PIXEL_ORDER_RGB,
> >  				       BCM2835_MBOX_ALPHA_MODE_IGNORED,
> >  				       &fb_base, &fb_size, &pitch);
> > +	if (ret)
> > +		return ret;
> >  
> >  	debug("bcm2835: Final resolution is %d x %d\n", w, h);
> >  
> >