Message-ID: <55CEC3D8.7060103@wwwdotorg.org>
Date: Fri, 14 Aug 2015 22:45:12 -0600
From: Stephen Warren <swarren@wwwdotorg.org>
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.8.0
MIME-Version: 1.0
To: Eric Anholt <eric@anholt.net>
CC: dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org,
        linux-rpi-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Lee Jones <lee@kernel.org>, devicetree@vger.kernel.org
Subject: Re: [PATCH 3/7] drm/vc4: Add KMS support for Raspberry Pi.
References: <1439427380-2436-1-git-send-email-eric@anholt.net> <1439427380-2436-4-git-send-email-eric@anholt.net>
In-Reply-To: <1439427380-2436-4-git-send-email-eric@anholt.net>
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1167
Lines: 27

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?
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/