Messages in this thread | | | Subject | Re: [PATCH v2] clk: stm32f4: fix post divisor setup for I2S/SAI PLLs | From | Stephen Boyd <> | Date | Wed, 30 Jun 2021 11:36:40 -0700 |
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Quoting Dario Binacchi (2021-06-23 14:00:39) > 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> > > ---
Can someone from ST review this? Gabriel or Alexandre?
> > Changes in v2: > - Change 'u8 pll_num' from 'stm32f4_pll_post_div_data' structure into > 'int pll_idx'. > > drivers/clk/clk-stm32f4.c | 10 +++++----- > 1 file changed, 5 insertions(+), 5 deletions(-) > > diff --git a/drivers/clk/clk-stm32f4.c b/drivers/clk/clk-stm32f4.c > index 18117ce5ff85..5c75e3d906c2 100644 > --- a/drivers/clk/clk-stm32f4.c > +++ b/drivers/clk/clk-stm32f4.c > @@ -526,7 +526,7 @@ struct stm32f4_pll { > > struct stm32f4_pll_post_div_data { > int idx; > - u8 pll_num; > + int pll_idx; > const char *name; > const char *parent; > u8 flag; > @@ -557,13 +557,13 @@ static const struct clk_div_table post_divr_table[] = { > > #define MAX_POST_DIV 3 > static const struct stm32f4_pll_post_div_data post_div_data[MAX_POST_DIV] = { > - { CLK_I2SQ_PDIV, PLL_I2S, "plli2s-q-div", "plli2s-q", > + { CLK_I2SQ_PDIV, PLL_VCO_I2S, "plli2s-q-div", "plli2s-q", > CLK_SET_RATE_PARENT, STM32F4_RCC_DCKCFGR, 0, 5, 0, NULL}, > > - { CLK_SAIQ_PDIV, PLL_SAI, "pllsai-q-div", "pllsai-q", > + { CLK_SAIQ_PDIV, PLL_VCO_SAI, "pllsai-q-div", "pllsai-q", > CLK_SET_RATE_PARENT, STM32F4_RCC_DCKCFGR, 8, 5, 0, NULL }, > > - { NO_IDX, PLL_SAI, "pllsai-r-div", "pllsai-r", CLK_SET_RATE_PARENT, > + { NO_IDX, PLL_VCO_SAI, "pllsai-r-div", "pllsai-r", CLK_SET_RATE_PARENT, > STM32F4_RCC_DCKCFGR, 16, 2, 0, post_divr_table }, > }; > > @@ -1774,7 +1774,7 @@ static void __init stm32f4_rcc_init(struct device_node *np) > post_div->width, > post_div->flag_div, > post_div->div_table, > - clks[post_div->pll_num], > + clks[post_div->pll_idx], > &stm32f4_clk_lock); > > if (post_div->idx != NO_IDX)
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