Re: [PATCH 5.3 204/344] SoC: simple-card-utils: set 0Hz to sysclk when shutdown

On Thu, Oct 03, 2019 at 05:52:49PM +0200, Greg Kroah-Hartman wrote:

From: Katsuhiro Suzuki katsuhiro@katsuster.net

[ Upstream commit 2458adb8f92ad4d07ef7ab27c5bafa1d3f4678d6 ]

This patch set 0Hz to sysclk when shutdown the card.

Some codecs set rate constraints that derives from sysclk. This mechanism works correctly if machine drivers give fixed frequency.

But simple-audio and audio-graph card set variable clock rate if 'mclk-fs' property exists. In this case, rate constraints will go bad scenario. For example a codec accepts three limited rates (mclk / 256, mclk / 384, mclk / 512).

This is a new feature which seems out of scope for stable - I thought I'd raised this already?