From: Eric Anholt <eric@anholt.net>
To: Stephen Warren <swarren@wwwdotorg.org>
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.
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.
WARNING: multiple messages have this Message-ID (diff)
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.
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/dri-devel
WARNING: multiple messages have this Message-ID (diff)
From: eric@anholt.net (Eric Anholt)
To: linux-arm-kernel@lists.infradead.org
Subject: [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.
next prev parent reply other threads:[~2015-08-17 17:56 UTC|newest]
Thread overview: 101+ 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 ` Eric Anholt
2015-08-13 0:56 ` Eric Anholt
2015-08-13 0:56 ` [PATCH 1/7] drm/vc4: Add devicetree bindings for VC4 Eric Anholt
2015-08-13 0:56 ` Eric Anholt
2015-08-13 0:56 ` Eric Anholt
2015-08-15 4:38 ` Stephen Warren
2015-08-15 4:38 ` Stephen Warren
2015-08-17 18:30 ` Eric Anholt
2015-08-17 18:30 ` Eric Anholt
2015-08-17 18:30 ` Eric Anholt
2015-08-24 13:47 ` Rob Herring
2015-08-24 13:47 ` Rob Herring
2015-08-24 13:47 ` Rob Herring
2015-08-25 20:42 ` Rob Clark
2015-08-25 20:42 ` Rob Clark
2015-08-25 20:42 ` Rob Clark
2015-08-25 23:22 ` Rob Herring
2015-08-25 23:22 ` Rob Herring
2015-08-25 23:22 ` Rob Herring
2015-08-26 11:52 ` Daniel Vetter
2015-08-26 11:52 ` Daniel Vetter
2015-08-26 11:52 ` Daniel Vetter
2015-08-26 12:09 ` Thierry Reding
2015-08-26 12:09 ` Thierry Reding
2015-08-26 12:09 ` Thierry Reding
2015-08-26 14:30 ` Rob Herring
2015-08-26 14:30 ` Rob Herring
2015-08-26 14:30 ` Rob Herring
2015-08-26 20:59 ` Dave Airlie
2015-08-26 20:59 ` Dave Airlie
2015-08-26 20:59 ` Dave Airlie
2015-08-27 0:35 ` Rob Herring
2015-08-27 0:35 ` Rob Herring
2015-08-27 0:35 ` Rob Herring
2015-08-26 11:51 ` Thierry Reding
2015-08-26 11:51 ` Thierry Reding
2015-08-26 11:51 ` Thierry Reding
2015-08-24 13:56 ` Rob Herring
2015-08-24 13:56 ` Rob Herring
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
2015-08-13 0:56 ` Eric Anholt
2015-08-13 0:56 ` Eric Anholt
2015-08-15 4:39 ` Stephen Warren
2015-08-15 4:39 ` Stephen Warren
2015-08-15 4:39 ` Stephen Warren
2015-08-17 18:47 ` Eric Anholt
2015-08-17 18:47 ` Eric Anholt
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 0:56 ` Eric Anholt
2015-08-13 0:56 ` Eric Anholt
2015-08-13 7:51 ` Daniel Vetter
2015-08-13 7:51 ` Daniel Vetter
2015-08-13 7:51 ` Daniel Vetter
2015-08-13 20:44 ` Eric Anholt
2015-08-13 20:44 ` Eric Anholt
2015-08-13 20:44 ` Eric Anholt
2015-08-13 21:17 ` Daniel Vetter
2015-08-13 21:17 ` Daniel Vetter
2015-08-13 21:17 ` Daniel Vetter
2015-08-18 20:56 ` Eric Anholt
2015-08-18 20:56 ` Eric Anholt
2015-08-18 20:56 ` Eric Anholt
2015-08-13 21:29 ` Russell King - ARM Linux
2015-08-13 21:29 ` Russell King - ARM Linux
2015-08-13 21:29 ` Russell King - ARM Linux
2015-08-13 23:03 ` Eric Anholt
2015-08-13 23:03 ` Eric Anholt
2015-08-13 23:03 ` Eric Anholt
2015-08-13 11:45 ` Emil Velikov
2015-08-13 11:45 ` Emil Velikov
2015-08-13 11:45 ` Emil Velikov
2015-08-15 4:45 ` Stephen Warren
2015-08-15 4:45 ` Stephen Warren
2015-08-15 4:45 ` Stephen Warren
2015-08-17 17:56 ` Eric Anholt [this message]
2015-08-17 17:56 ` Eric Anholt
2015-08-17 17:56 ` Eric Anholt
2015-08-13 0:56 ` [PATCH 4/7] drm/vc4: Use the fbdev_cma helpers Eric Anholt
2015-08-13 0:56 ` Eric Anholt
2015-08-13 0:56 ` Eric Anholt
2015-08-13 0:56 ` [PATCH 5/7] drm/vc4: Allow vblank to be disabled Eric Anholt
2015-08-13 0:56 ` Eric Anholt
2015-08-13 0:56 ` Eric Anholt
2015-08-13 0:56 ` [PATCH 6/7] ARM: bcm2835: Add the DDC I2C controller to the device tree Eric Anholt
2015-08-13 0:56 ` Eric Anholt
2015-08-13 0:56 ` Eric Anholt
2015-08-15 4:51 ` Stephen Warren
2015-08-15 4:51 ` Stephen Warren
2015-08-15 4:51 ` Stephen Warren
2015-08-17 18:35 ` Eric Anholt
2015-08-17 18:35 ` Eric Anholt
2015-08-17 18:35 ` Eric Anholt
2015-08-13 0:56 ` [PATCH 7/7] ARM: bcm2835: Add VC4 " Eric Anholt
2015-08-13 0:56 ` Eric Anholt
2015-08-13 0:56 ` Eric Anholt
2015-08-15 4:54 ` Stephen Warren
2015-08-15 4:54 ` Stephen Warren
2015-08-15 4:54 ` Stephen Warren
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