On Tue, 2011-02-08 at 10:28 -0500, Alex Deucher wrote: > On Tue, Feb 8, 2011 at 4:47 AM, Hans Verkuil <hansverk@xxxxxxxxx> wrote: > > Just two quick notes. I'll try to do a full review this weekend. > > > > On Tuesday, February 08, 2011 10:30:22 Tomasz Stanislawski wrote: > >> ============== > >> Introduction > >> ============== > >> > >> The purpose of this RFC is to discuss the driver for a TV output interface > >> available in upcoming Samsung SoC. The HW is able to generate digital and > >> analog signals. Current version of the driver supports only digital output. > >> > >> Internally the driver uses videobuf2 framework, and CMA memory allocator. > > Not > >> all of them are merged by now, but I decided to post the sources to start > >> discussion driver's design. > > > > Cisco (i.e. a few colleagues and myself) are working on this. We hope to post > > an RFC by the end of this month. We also have a proposal for CEC support in > > the pipeline. > > Any reason to not use the drm kms APIs for modesetting, display > configuration, and hotplug support? We already have the > infrastructure in place for complex display configurations and > generating events for hotplug interrupts. It would seem to make more > sense to me to fix any deficiencies in the KMS APIs than to spin a new > API. Things like CEC would be a natural fit since a lot of desktop > GPUs support hdmi audio/3d/etc. and are already using kms. > > Alex I'll toss one out: lack of API documentation for driver or application developers to use. When I last looked at converting ivtvfb to use DRM, KMS, TTM, etc. (to possibly get rid of reliance on the ivtv X video driver http://dl.ivtvdriver.org/xf86-video-ivtv/ ), I found the documentation was really sparse. DRM had the most documentation under Documentation/DocBook/drm.tmpl, but the userland API wasn't fleshed out. GEM was talked about a bit in there as well, IIRC. TTM documentation was essentially non-existant. I can't find any KMS documentation either. I recall having to read much of the drm code, and having to look at the radeon driver, just to tease out what the DRM ioctls needed to do. Am I missing a Documentation source for the APIs? For V4L2 and DVB on ther other hand, one can point to pretty verbose documentation that application developers can use: http://linuxtv.org/downloads/v4l-dvb-apis/ Regards, Andy -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
