[PATCH 3/7] drm/vc4: Add KMS support for Raspberry Pi.
eric at anholt.net
Mon Aug 17 10:56:23 PDT 2015
r<#secure method=pgpmime mode=sign>
Stephen Warren <swarren at wwwdotorg.org> writes:
> 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
>> 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?
The warnings thing is the firmware watching for undervoltage and then it
calls into dispmanx to overlay a little rainbow box on the screen. This
of course interferes with our display setup.
I think we'll be able to wire up notifications to Linux for
undervoltage, at which point we can do something useful with that
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