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From: Eric Anholt <eric@anholt.net>
To: Stephen Warren <swarren@wwwdotorg.org>
Cc: devicetree@vger.kernel.org, Lee Jones <lee@kernel.org>,
	linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
	linux-rpi-kernel@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 3/7] drm/vc4: Add KMS support for Raspberry Pi.
Date: Mon, 17 Aug 2015 10:56:23 -0700	[thread overview]
Message-ID: <877fotx0hk.fsf@eliezer.anholt.net> (raw)
In-Reply-To: <55CEC3D8.7060103@wwwdotorg.org>

r<#secure method=pgpmime mode=sign>
Stephen Warren <swarren@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
>> 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?

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
information, ourselves.
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  reply	other threads:[~2015-08-17 17:56 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-08-13  0:56 Raspberry Pi KMS-only driver Eric Anholt
2015-08-13  0:56 ` [PATCH 1/7] drm/vc4: Add devicetree bindings for VC4 Eric Anholt
2015-08-15  4:38   ` Stephen Warren
2015-08-17 18:30     ` Eric Anholt
     [not found]       ` <874mjxwyx5.fsf-omZaPlIz5HhaEpDpdNBo/KxOck334EZe@public.gmane.org>
2015-08-24 13:47         ` Rob Herring
2015-08-25 20:42           ` Rob Clark
2015-08-25 23:22             ` Rob Herring
2015-08-26 11:52             ` Daniel Vetter
2015-08-26 12:09               ` Thierry Reding
     [not found]                 ` <20150826120934.GC320-AwZRO8vwLAwmlAP/+Wk3EA@public.gmane.org>
2015-08-26 14:30                   ` Rob Herring
2015-08-26 20:59                     ` Dave Airlie
     [not found]                       ` <CAPM=9tw=3yGQE3_G+=ian-+iV-OCRatbFc-stoMczmXeM2Ko+Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-08-27  0:35                         ` Rob Herring
2015-08-26 11:51     ` Thierry Reding
2015-08-24 13:56   ` Rob Herring
2015-08-13  0:56 ` [PATCH 2/7] MAINTAINERS: Add myself for the new VC4 (RPi GPU) graphics driver Eric Anholt
     [not found]   ` <1439427380-2436-3-git-send-email-eric-WhKQ6XTQaPysTnJN9+BGXg@public.gmane.org>
2015-08-15  4:39     ` Stephen Warren
     [not found]       ` <55CEC29C.806-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2015-08-17 18:47         ` Eric Anholt
2015-08-13  0:56 ` [PATCH 3/7] drm/vc4: Add KMS support for Raspberry Pi Eric Anholt
2015-08-13  7:51   ` Daniel Vetter
2015-08-13 20:44     ` Eric Anholt
2015-08-13 21:17       ` Daniel Vetter
2015-08-18 20:56         ` Eric Anholt
2015-08-13 21:29       ` Russell King - ARM Linux
2015-08-13 23:03         ` Eric Anholt
     [not found]   ` <1439427380-2436-4-git-send-email-eric-WhKQ6XTQaPysTnJN9+BGXg@public.gmane.org>
2015-08-13 11:45     ` Emil Velikov
2015-08-15  4:45     ` Stephen Warren
2015-08-17 17:56       ` Eric Anholt [this message]
2015-08-13  0:56 ` [PATCH 4/7] drm/vc4: Use the fbdev_cma helpers Eric Anholt
2015-08-13  0:56 ` [PATCH 5/7] drm/vc4: Allow vblank to be disabled Eric Anholt
2015-08-13  0:56 ` [PATCH 6/7] ARM: bcm2835: Add the DDC I2C controller to the device tree Eric Anholt
     [not found]   ` <1439427380-2436-7-git-send-email-eric-WhKQ6XTQaPysTnJN9+BGXg@public.gmane.org>
2015-08-15  4:51     ` Stephen Warren
2015-08-17 18:35       ` Eric Anholt
2015-08-13  0:56 ` [PATCH 7/7] ARM: bcm2835: Add VC4 " Eric Anholt
     [not found]   ` <1439427380-2436-8-git-send-email-eric-WhKQ6XTQaPysTnJN9+BGXg@public.gmane.org>
2015-08-15  4:54     ` Stephen Warren

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