6.7-stable review patch. If anyone has any objections, please let me know.
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From: Sam Edwards cfsworks@gmail.com
commit 44de8996ed5a10f08f2fe947182da6535edcfae5 upstream.
The QoS blocks saved/restored when toggling the PD_USB power domain are clocked by ACLK_USB. Attempting to access these memory regions without that clock running will result in an indefinite CPU stall.
The PD_USB node wasn't specifying this clock dependency, resulting in hangs when trying to toggle the power domain (either on or off), unless we get "lucky" and have ACLK_USB running for another reason at the time. This "luck" can result from the bootloader leaving USB powered/clocked, and if no built-in driver wants USB, Linux will disable the unused PD+CLK on boot when {pd,clk}_ignore_unused aren't given. This can also be unlucky because the two cleanup tasks run in parallel and race: if the CLK is disabled first, the PD deactivation stalls the boot. In any case, the PD cannot then be reenabled (if e.g. the driver loads later) once the clock has been stopped.
Fix this by specifying a dependency on ACLK_USB, instead of only ACLK_USB_ROOT. The child-parent relationship means the former implies the latter anyway.
Fixes: c9211fa2602b8 ("arm64: dts: rockchip: Add base DT for rk3588 SoC") Cc: stable@vger.kernel.org Signed-off-by: Sam Edwards CFSworks@gmail.com Link: https://lore.kernel.org/r/20231216021019.1543811-1-CFSworks@gmail.com [changed to only include the missing clock, not dropping the root-clocks] Signed-off-by: Heiko Stuebner heiko@sntech.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/arm64/boot/dts/rockchip/rk3588s.dtsi | 1 + 1 file changed, 1 insertion(+)
--- a/arch/arm64/boot/dts/rockchip/rk3588s.dtsi +++ b/arch/arm64/boot/dts/rockchip/rk3588s.dtsi @@ -916,6 +916,7 @@ reg = <RK3588_PD_USB>; clocks = <&cru PCLK_PHP_ROOT>, <&cru ACLK_USB_ROOT>, + <&cru ACLK_USB>, <&cru HCLK_USB_ROOT>, <&cru HCLK_HOST0>, <&cru HCLK_HOST_ARB0>,