clk: stm32f4: fix post divisor setup for I2S/SAI PLLs
Enabling the framebuffer leads to a system hang. Running, as a debug
hack, the store_pan() function in drivers/video/fbdev/core/fbsysfs.c
without taking the console_lock, allows to see the crash backtrace on
the serial line.
~ # echo 0 0 > /sys/class/graphics/fb0/pan
[ 9.719414] Unhandled exception: IPSR =
00000005 LR =
fffffff1
[ 9.726937] CPU: 0 PID: 49 Comm: sh Not tainted 5.13.0-rc5 #9
[ 9.733008] Hardware name: STM32 (Device Tree Support)
[ 9.738296] PC is at clk_gate_is_enabled+0x0/0x28
[ 9.743426] LR is at stm32f4_pll_div_set_rate+0xf/0x38
[ 9.748857] pc : [<
0011e4be>] lr : [<
0011f9e3>] psr:
0100000b
[ 9.755373] sp :
00bc7be0 ip :
00000000 fp :
001f3ac4
[ 9.760812] r10:
002610d0 r9 :
01efe920 r8 :
00540560
[ 9.766269] r7 :
02e7ddb0 r6 :
0173eed8 r5 :
00000000 r4 :
004027c0
[ 9.773081] r3 :
0011e4bf r2 :
02e7ddb0 r1 :
0173eed8 r0 :
1d3267b8
[ 9.779911] xPSR:
0100000b
[ 9.782719] CPU: 0 PID: 49 Comm: sh Not tainted 5.13.0-rc5 #9
[ 9.788791] Hardware name: STM32 (Device Tree Support)
[ 9.794120] [<
0000afa1>] (unwind_backtrace) from [<
0000a33f>] (show_stack+0xb/0xc)
[ 9.802421] [<
0000a33f>] (show_stack) from [<
0000a8df>] (__invalid_entry+0x4b/0x4c)
The `pll_num' field in the post_div_data configuration contained a wrong
value which also referenced an uninitialized hardware clock when
clk_register_pll_div() was called.
Fixes:
517633ef630e ("clk: stm32f4: Add post divisor for I2S & SAI PLLs")
Signed-off-by: Dario Binacchi <dariobin@libero.it>
Reviewed-by: Gabriel Fernandez <gabriel.fernandez@st.com>
Link: https://lore.kernel.org/r/20210725160725.10788-1-dariobin@libero.it
Signed-off-by: Stephen Boyd <sboyd@kernel.org>