Hi Hans, On 24/03/16 23:20, Hans Verkuil wrote: > Hi Tomi, > > I hope you (or someone else on this list) can help me find the problem in this code. > > I am working on a kernel framework for HDMI CEC (see https://lwn.net/Articles/680942/). > In order to get as much experience with different devices as possible I am trying to > implement it on my omap4430 Pandaboard. The big problem I am facing is that the CEC > interrupts come in through the HDMI_IRQ_CORE interrupt, and that just refuses to > trigger. > > The code below adds support for this core interrupt and it is supposed to trigger it > using the Software Induced interrupt to keep the code as simple as possible. So this irq is just for testing? > On boot I get this debug line from the pr_info in my code: > > irqstat 02000000 wp_irq 06000001 raw 20010000 intr_state 00000001 intr1 00000080 unmask1 00000080 intr_ctrl 0000000a > > As far as I can see everything looks perfectly fine, except for the fact that bit 0 > of the irqstat is stubbornly 0. > > This is using kernel 4.5 with only this patch applied. > > What am I missing? Set SYS_CTRL1:PD to 1 (I presume you have the NDA HDMI TRM?). Apparently we set it always to 0 in hdmi4_core.c:hdmi_core_powerdown_disable(), but never enable it. I guess it only affects core irqs, so there have been no side effects. But it would make sense to either have a matching call in the enable path, or then just set it to 0 when initializing the IP. > > The reward for the right answer will be HDMI CEC support for omap4 (and any other TI device > with the same CEC IP). Ok. When is it ready? ;) Tomi
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