This is a note to let you know that I've just added the patch titled clk: bcm2835: Make peripheral PLLC critical to the 5.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: clk-bcm2835-make-peripheral-pllc-critical.patch and it can be found in the queue-5.15 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 08f556567b3551ffc8c591cf31c7318f829f0cbc Author: Maxime Ripard <maxime@xxxxxxxxxx> Date: Mon Sep 26 10:45:09 2022 +0200 clk: bcm2835: Make peripheral PLLC critical [ Upstream commit 6c5422851d8be8c7451e968fd2e6da41b6109e17 ] When testing for a series affecting the VEC, it was discovered that turning off and on the VEC clock is crashing the system. It turns out that, when disabling the VEC clock, it's the only child of the PLLC-per clock which will also get disabled. The source of the crash is PLLC-per being disabled. It's likely that some other device might not take a clock reference that it actually needs, but it's unclear which at this point. Let's make PLLC-per critical so that we don't have that crash. Reported-by: Noralf Trønnes <noralf@xxxxxxxxxxx> Signed-off-by: Maxime Ripard <maxime@xxxxxxxxxx> Link: https://lore.kernel.org/r/20220926084509.12233-1-maxime@xxxxxxxxxx Reviewed-by: Stefan Wahren <stefan.wahren@xxxxxxxx> Acked-by: Noralf Trønnes <noralf@xxxxxxxxxxx> Signed-off-by: Stephen Boyd <sboyd@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/clk/bcm/clk-bcm2835.c b/drivers/clk/bcm/clk-bcm2835.c index 2200305a722d..f17b65d546e9 100644 --- a/drivers/clk/bcm/clk-bcm2835.c +++ b/drivers/clk/bcm/clk-bcm2835.c @@ -1785,7 +1785,7 @@ static const struct bcm2835_clk_desc clk_desc_array[] = { .load_mask = CM_PLLC_LOADPER, .hold_mask = CM_PLLC_HOLDPER, .fixed_divider = 1, - .flags = CLK_SET_RATE_PARENT), + .flags = CLK_IS_CRITICAL | CLK_SET_RATE_PARENT), /* * PLLD is the display PLL, used to drive DSI display panels.