Re: [PATCH 3/7] drm/vc4: Add KMS support for Raspberry Pi.

From: Stephen Warren
Date: Sat Aug 15 2015 - 00:45:22 EST

On 08/12/2015 06:56 PM, Eric Anholt wrote:
> This is the start of a full VC4 driver. Right now this just supports
> configuring the display using a pre-existing video mode (because
> changing the pixel clock isn't available yet, and doesn't work when it
> is). However, this is enough for fbcon and bringing up X using
> xf86-video-modesetting.

> diff --git a/drivers/gpu/drm/vc4/Kconfig b/drivers/gpu/drm/vc4/Kconfig

> +config DRM_VC4
> + tristate "Broadcom VC4 Graphics"

> + help
> + Choose this option if you have a system that has a Broadcom
> + VC4 GPU, such as the Raspberry Pi or other BCM2708/BCM2835.
> +
> + This driver requires that "avoid_warnings=2" be present in
> + the config.txt for the firmware, to keep it from smashing
> + our display setup.

The need for "avoid_warnings=2" seems like it will trip people up. I
don't think it's in any config.txt I've seen. Can you expand more on that?
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