<br><div class="gmail_quote"><div><div class="h5"><div class="gmail_quote">On Thu, Jul 1, 2010 at 8:18 PM, Saravana Kannan <span dir="ltr"><<a href="mailto:skannan@codeaurora.org" target="_blank">skannan@codeaurora.org</a>></span> wrote:<br>
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<div>Dave Airlie wrote:<br>
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This is more about initial development stages. We maintain kernel<br>
API/ABI for all in-tree drivers, however before we put a driver into<br>
mainline, we usually need to redo the crazy interfaces that vendors<br>
have come up with. Like 32/64 alignment, passing userspace addresses<br>
into the kernel, passing phy addresses to userspace etc. If the<br>
userspace binary is closed that process becomes next to impossible.<br>
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<br></div>
My 2 cents:<br>
I think we should leave the onus of fixing the userspace to work with the sane kernel API with the entity trying to get their drivers into the kernel. I think it's a better approach (as in, more likelihood of getting device support) than saying, we will only allow fully open sourced kernel drivers.<br>
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-Saravana</font><div><div></div><div><br>
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</div></div></blockquote></div><br><br></div></div>Hello. I've been working with the developers on the htc-linux project
and following the progress of Android on MSM devices closely for a few
years. I've been excitied to see DRM/DRI replace PMEM and the Android
specific interfaces be replaced with more Linux-like ones. The Xorg
driver from Qualcomm uses this same interface for 2D and it's possible
that Android will take the same approach, though it uses 3D and GLES as a
type of abstraction layer for surfaceflinger. This allows for a closed
3D driver with an open command submission layer that is in itself not
that different from the split for ATI devices using radeonhd. I say
this because the alternative for these devices is a fully closed binary
and secrecy surrounding the graphics layers that ensures that only the
OS that ships with the device can ever really be used and preventing
those non-coorporate developers as myself from utilising GPL code the
way we want or even usuing are own cell phones (in this case). I would
choose a fully open, X based OS even if that meant only having 2D
drivers, but I know that Quic and others aren't going to develop just a
(accelerated) 2D driver, not the kernel components or userspace but
instead rely on the same GLES layer that Android uses, essentially
making X and open environments a second class citizen on modern mobile
hardware.<br>
<br>
I hope those making the decision will take this into consideration.<br><font color="#888888">
<br>
--<br>
Timothy Meade (tmzt on freenode)<br><br>
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