From: Dario Binacchi <dariobin@libero.it> To: linux-clk@vger.kernel.org Cc: Dario Binacchi <dariobin@libero.it>, Alexandre Torgue <alexandre.torgue@foss.st.com>, Gabriel Fernandez <gabriel.fernandez@st.com>, Maxime Coquelin <mcoquelin.stm32@gmail.com>, Michael Turquette <mturquette@baylibre.com>, Stephen Boyd <sboyd@kernel.org>, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com Subject: [RESEND PATCH v4] clk: stm32f4: fix post divisor setup for I2S/SAI PLLs Date: Sun, 25 Jul 2021 18:07:25 +0200 [thread overview] Message-ID: <20210725160725.10788-1-dariobin@libero.it> (raw) 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> --- I added Gabriel Fernandez's 'Reviewed-by' tag as requested by himself 15 days ago at https://lore.kernel.org/patchwork/patch/1450964/. Changes in v4: - Really add Gabriel Fernandez 'Reviewed-by' tag. In version 3 I forgot to add the tag. Changes in v3: - Add Gabriel Fernandez 'Reviewed-by' tag. 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) -- 2.17.1
WARNING: multiple messages have this Message-ID (diff)
From: Dario Binacchi <dariobin@libero.it> To: linux-clk@vger.kernel.org Cc: Dario Binacchi <dariobin@libero.it>, Alexandre Torgue <alexandre.torgue@foss.st.com>, Gabriel Fernandez <gabriel.fernandez@st.com>, Maxime Coquelin <mcoquelin.stm32@gmail.com>, Michael Turquette <mturquette@baylibre.com>, Stephen Boyd <sboyd@kernel.org>, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com Subject: [RESEND PATCH v4] clk: stm32f4: fix post divisor setup for I2S/SAI PLLs Date: Sun, 25 Jul 2021 18:07:25 +0200 [thread overview] Message-ID: <20210725160725.10788-1-dariobin@libero.it> (raw) 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> --- I added Gabriel Fernandez's 'Reviewed-by' tag as requested by himself 15 days ago at https://lore.kernel.org/patchwork/patch/1450964/. Changes in v4: - Really add Gabriel Fernandez 'Reviewed-by' tag. In version 3 I forgot to add the tag. Changes in v3: - Add Gabriel Fernandez 'Reviewed-by' tag. 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) -- 2.17.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next reply other threads:[~2021-07-25 16:07 UTC|newest] Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-07-25 16:07 Dario Binacchi [this message] 2021-07-25 16:07 ` [RESEND PATCH v4] clk: stm32f4: fix post divisor setup for I2S/SAI PLLs Dario Binacchi 2021-07-27 0:22 ` Stephen Boyd 2021-07-27 0:22 ` Stephen Boyd 2021-07-28 10:03 ` Dillon Hua 2021-07-28 10:03 ` Dillon Hua 2021-07-29 10:03 ` Dario Binacchi 2021-07-29 10:03 ` Dario Binacchi 2021-07-30 19:47 ` Stephen Boyd 2021-07-30 19:47 ` Stephen Boyd 2021-07-30 21:22 ` Dario Binacchi 2021-07-30 21:22 ` Dario Binacchi 2021-08-01 14:56 ` Dillon Hua 2021-08-01 14:56 ` Dillon Hua 2021-08-01 19:37 ` Dario Binacchi 2021-08-01 19:37 ` Dario Binacchi 2021-08-02 22:09 ` Stephen Boyd 2021-08-02 22:09 ` Stephen Boyd
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20210725160725.10788-1-dariobin@libero.it \ --to=dariobin@libero.it \ --cc=alexandre.torgue@foss.st.com \ --cc=gabriel.fernandez@st.com \ --cc=linux-arm-kernel@lists.infradead.org \ --cc=linux-clk@vger.kernel.org \ --cc=linux-kernel@vger.kernel.org \ --cc=linux-stm32@st-md-mailman.stormreply.com \ --cc=mcoquelin.stm32@gmail.com \ --cc=mturquette@baylibre.com \ --cc=sboyd@kernel.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.