Re: [omapdss] fault in dispc_write_irqenable [was: Re: [omap3isp] xclk deadlock]
On 26/07/13 18:37, Jakub Piotr Cłapa wrote: Using omapfb, or...? I hope not omap_vout, because that's rather unmaintained =). Laurent's live application is using the V4L2 API for video output (to get free YUV conversion and DMA) so I guess this unfortunatelly counts as using omap_vout. Are there any alternatives I should look into? IIUC Ok. Do you have a call trace for the dispc_write_irqenable crash? Maybe it's something simple to fix. Tomi signature.asc Description: OpenPGP digital signature
[omapdss] fault in dispc_write_irqenable [was: Re: [omap3isp] xclk deadlock]
Dear Tomi, Thanks for your reply. On 26.07.13 09:50, Tomi Valkeinen wrote: Sounds like something is enabling/disabling dispc interrupts after the clocks have already been turned off. So what's the context here? What kernel? This was on 3.10 from Laurent's board/beagle/mt9p031 branch. I am in the middle of doing some bisecting to figure out some unrelated problems with omap3isp so in a couple days I may have more data about which versions work and which do not. Using omapfb, or...? I hope not omap_vout, because that's rather unmaintained =). Laurent's live application is using the V4L2 API for video output (to get free YUV conversion and DMA) so I guess this unfortunatelly counts as using omap_vout. Are there any alternatives I should look into? IIUC to use omapfb I would need to manually copy RGB data into the framebuffer on each frame. -- regards, Jakub Piotr Cłapa LoEE.pl -- To unsubscribe from this list: send the line unsubscribe linux-media in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [omapdss] fault in dispc_write_irqenable [was: Re: [omap3isp] xclk deadlock]
Hi Jakub, On Friday 26 July 2013 17:37:36 Jakub Piotr Cłapa wrote: Dear Tomi, Thanks for your reply. On 26.07.13 09:50, Tomi Valkeinen wrote: Sounds like something is enabling/disabling dispc interrupts after the clocks have already been turned off. So what's the context here? What kernel? This was on 3.10 from Laurent's board/beagle/mt9p031 branch. I am in the middle of doing some bisecting to figure out some unrelated problems with omap3isp so in a couple days I may have more data about which versions work and which do not. Using omapfb, or...? I hope not omap_vout, because that's rather unmaintained =). Laurent's live application is using the V4L2 API for video output (to get free YUV conversion and DMA) so I guess this unfortunatelly counts as using omap_vout. Are there any alternatives I should look into? IIUC to use omapfb I would need to manually copy RGB data into the framebuffer on each frame. It should be possible to port the live application to use DRM/KMS with omapdrm for the display side, without requiring any memory copy. That's somewhere on my TODO list, but I won't have time to work on that before way too long. -- Regards, Laurent Pinchart -- To unsubscribe from this list: send the line unsubscribe linux-media in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [omapdss] fault in dispc_write_irqenable [was: Re: [omap3isp] xclk deadlock]
On 26.07.13 17:52, Laurent Pinchart wrote: Using omapfb, or...? I hope not omap_vout, because that's rather unmaintained =). Laurent's live application is using the V4L2 API for video output (to get free YUV conversion and DMA) so I guess this unfortunatelly counts as using omap_vout. Are there any alternatives I should look into? IIUC to use omapfb I would need to manually copy RGB data into the framebuffer on each frame. It should be possible to port the live application to use DRM/KMS with omapdrm for the display side, without requiring any memory copy. That's somewhere on my TODO list, but I won't have time to work on that before way too long. I could look into it myself but is there any documentation on omapdrm? From what I found libdrm should probably be used but information about it's API is really scarce: https://dvdhrm.wordpress.com/2012/09/13/linux-drm-mode-setting-api/ http://dvdhrm.wordpress.com/2012/12/21/advanced-drm-mode-setting-api/ http://virtuousgeek.org/blog/index.php/jbarnes/2011/10/31/writing_stanalone_programs_with_egl_and_ The last one seems focused on OpenGL so I don't think it applies. Are there any good sources to learn about this? Or maybe some pointers on where to start with reading source code? -- regards, Jakub Piotr Cłapa LoEE.pl -- To unsubscribe from this list: send the line unsubscribe linux-media in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [omapdss] fault in dispc_write_irqenable [was: Re: [omap3isp] xclk deadlock]
Hi Jakub, On Friday 26 July 2013 21:02:35 Jakub Piotr Cłapa wrote: On 26.07.13 17:52, Laurent Pinchart wrote: Using omapfb, or...? I hope not omap_vout, because that's rather unmaintained =). Laurent's live application is using the V4L2 API for video output (to get free YUV conversion and DMA) so I guess this unfortunatelly counts as using omap_vout. Are there any alternatives I should look into? IIUC to use omapfb I would need to manually copy RGB data into the framebuffer on each frame. It should be possible to port the live application to use DRM/KMS with omapdrm for the display side, without requiring any memory copy. That's somewhere on my TODO list, but I won't have time to work on that before way too long. I could look into it myself but is there any documentation on omapdrm? From what I found libdrm should probably be used but information about it's API is really scarce: https://dvdhrm.wordpress.com/2012/09/13/linux-drm-mode-setting-api/ http://dvdhrm.wordpress.com/2012/12/21/advanced-drm-mode-setting-api/ http://virtuousgeek.org/blog/index.php/jbarnes/2011/10/31/writing_stanalone_ programs_with_egl_and_ The last one seems focused on OpenGL so I don't think it applies. Are there any good sources to learn about this? Or maybe some pointers on where to start with reading source code? http://events.linuxfoundation.org/sites/events/files/lcjpcojp13_pinchart.pdf A bit of shameless self-advertising :-) It would have been clearer with the video, but it seems the talk hasn't been recorded :-/ There's also http://www.youtube.com/watch?v=Ja8fM7rTae4 that mostly focuses on the kernel side but starts with explanations of the key KMS concepts. As far as KMS is concerned, libdrm is mostly a wrapper, so any documentation on the KMS ioctls can help too. -- Regards, Laurent Pinchart -- To unsubscribe from this list: send the line unsubscribe linux-media in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
