Hi Dave, On Tue, Feb 09, 2021 at 09:49:05AM +0000, Dave Stevenson wrote: > On Mon, 11 Jan 2021 at 14:23, Maxime Ripard <maxime@xxxxxxxxxx> wrote: > > > > The BSC controllers used for the HDMI DDC have an interrupt controller > > shared between both instances. Let's add it to avoid polling. > > This seems to have unintended side effects. > GIC interrupt 117 is shared between the standard I2C controllers > (i2c-bcm2835) and the l2-intc block handling the HDMI I2C interrupts. > > Whilst i2c-bcm2835 requests the interrupt with IRQF_SHARED, that > doesn't appear to be an option for l2-intc registering as an interrupt > controller. i2c-bcm2835 therefore loses out and fails to register for > the interrupt. > > Is there an equivalent flag that an interrupt controller can add to > say that the parent interrupt is shared? Is that even supported? Indeed, it looks like setting an equivalent to IRQF_SHARED would be the solution, but I couldn't find anything that would allow us to in the irqchip code. Marc, Thomas, is it something that is allowed? Thanks! Maxime
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