linux-kernel - Re: [RESEND PATCH v4] clk: stm32f4: fix post divisor setup for I2S/SAI PLLs

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Date:   Mon, 26 Jul 2021 17:22:49 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Dario Binacchi <dariobin@...ero.it>, linux-clk@...r.kernel.org
Cc:     Dario Binacchi <dariobin@...ero.it>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Gabriel Fernandez <gabriel.fernandez@...com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Michael Turquette <mturquette@...libre.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com
Subject: Re: [RESEND PATCH v4] clk: stm32f4: fix post divisor setup for I2S/SAI PLLs

Quoting Dario Binacchi (2021-07-25 09:07:25)
> 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@...ero.it>
> Reviewed-by: Gabriel Fernandez <gabriel.fernandez@...com>
> 
> ---

Applied to clk-fixes