r<#secure method=pgpmime mode=sign> Stephen Warren <swarren@xxxxxxxxxxxxx> 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. -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
