From: Maxime Ripard maxime@cerno.tech
[ 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@tronnes.org Signed-off-by: Maxime Ripard maxime@cerno.tech Link: https://lore.kernel.org/r/20220926084509.12233-1-maxime@cerno.tech Reviewed-by: Stefan Wahren stefan.wahren@i2se.com Acked-by: Noralf Trønnes noralf@tronnes.org Signed-off-by: Stephen Boyd sboyd@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/clk/bcm/clk-bcm2835.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/clk/bcm/clk-bcm2835.c b/drivers/clk/bcm/clk-bcm2835.c index 5a2f8d5d8d7a..180abc00160d 100644 --- a/drivers/clk/bcm/clk-bcm2835.c +++ b/drivers/clk/bcm/clk-bcm2835.c @@ -1737,7 +1737,7 @@ 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.