Am 2021-03-12 14:46, schrieb Mark Brown:
On Fri, Mar 12, 2021 at 01:30:02PM +0100, Michael Walle wrote:
The card calls set_sysclk(), which eventually ends up in the codec. The codec therefore, could figure out if it needs to configure the clock or if it can use its internal FLL. Is that what you mean?
Yes.
But the set_sysclk() of the codec isn't even called, because the card itself already tries to call clk_set_rate() on the Codec's MCLK, which returns with an error [0].
OK, so I think we need to push this down a level so that the clock setting is implemented by the core/CODEC rather than by simple-card, with the helpers being something the CODEC can opt out of.
Sameer, it looks like the proper fix should be to add the clock support to your codec.
I've also looked at other users of "simple-audio-card" and it looks like they will break too. For example, - arch/arm64/boot/dts/rockchip/rk3399.dtsi If I'm not mistaken, this will try to set the first clock of hdmi@ff940000 there, which is "iahb". - arch/arm/boot/dts/sun8i-a33.dtsi There "&ccu CLK_BUS_CODEC" of codec@1c22e00 will be changed
And it doesn't stop there, it also sets the first clock of the CPU endpoint, which I guess just works because .set_rate is a noop for the most clocks which are used there.
-michael