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[23.128.96.18]) by mx.google.com with ESMTP id k13si8025188edq.400.2021.08.01.12.40.39; Sun, 01 Aug 2021 12:41:03 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@libero.it header.s=s2021 header.b=Fe1EfhTw; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=libero.it Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229497AbhHAThV (ORCPT + 99 others); Sun, 1 Aug 2021 15:37:21 -0400 Received: from smtp-36-i2.italiaonline.it ([213.209.12.36]:53393 "EHLO libero.it" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S229529AbhHAThU (ORCPT ); Sun, 1 Aug 2021 15:37:20 -0400 Received: from oxapps-35-162.iol.local ([10.101.8.208]) by smtp-36.iol.local with ESMTPA id AHGomHcGbi9pCAHGomsnFR; Sun, 01 Aug 2021 21:37:10 +0200 x-libjamoibt: 1601 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=libero.it; s=s2021; t=1627846630; bh=i+Jr2jch3DQ0iVnKpe8taEm4qVQD9jcH2ZntxFvyIMM=; h=From; b=Fe1EfhTwz40jto9LLTDp+jE6nnyTidk5iWtrYuLDGLF4zuv7xI4p/AmARe7T+V6wT BktCRaYWu48P+tIcUVFeqKizm8E/Vb5uXgb2MhPbZjS4tAoNqDcerY1YpAvAEd/aGD ktKaFR951ILong5vlkr88DoE81E7R6skbkOh7wUI0/8gpr9Huh5SzJ3L7uW5PUOnX3 hDd86UX1A8tTdsZiXHaOksQDopYegNaGcvGl3FZdGBT+hrXszDyfR4I1HqvWF5snn4 uOBeIYfwOAEnT8W+fnGph2jNFKp2+xSi1xFekBsNVvyxPMxNadkkbstsDfBVi3N9hn 7bKGcGda9MTbA== X-CNFS-Analysis: v=2.4 cv=RqYAkAqK c=1 sm=1 tr=0 ts=6106f7e6 cx=a_exe a=OCAZjQWm+uh9gf1btJle/A==:117 a=J7go-RGC33AA:10 a=IkcTkHD0fZMA:10 a=nep-EciQ0nEA:10 a=pGLkceISAAAA:8 a=voM4FWlXAAAA:8 a=VwQbUJbxAAAA:8 a=8b9GpE9nAAAA:8 a=pgR7JClzwm78P6v5ddwA:9 a=QEXdDO2ut3YA:10 a=IC2XNlieTeVoXbcui8wp:22 a=AjGcO6oz07-iQ99wixmX:22 a=T3LWEMljR5ZiDmsYVIUa:22 Date: Sun, 1 Aug 2021 21:37:10 +0200 (CEST) From: Dario Binacchi To: Dillon Hua , Stephen Boyd Cc: linux-clk@vger.kernel.org, Alexandre Torgue , Gabriel Fernandez , Maxime Coquelin , Michael Turquette , Linux ARM , Linux Kernel Mailing List , linux-stm32@st-md-mailman.stormreply.com Message-ID: <1371790418.70998.1627846630234@mail1.libero.it> In-Reply-To: References: <20210725160725.10788-1-dariobin@libero.it> <1926284813.753014.1627553002984@mail1.libero.it> Subject: Re: [RESEND PATCH v4] clk: stm32f4: fix post divisor setup for I2S/SAI PLLs MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Priority: 3 Importance: Normal X-Mailer: Open-Xchange Mailer v7.10.3-Rev34 X-Originating-IP: 82.60.87.158 X-Originating-Client: open-xchange-appsuite x-libjamsun: gX2eDhe+Ni6lSZhpX7SY1Lqo02oL3piq x-libjamv: 3lw8Yq5FSc4= X-CMAE-Envelope: MS4xfN6Moqv1HwmyWG9rOisAnB/OtKGLRHgc1Gi91WYOykPshhHT4gtwUKA46OF6Rv0dk6iZzpaekkHeqZ/hvjXoZnoKztXDxG2uhQVJftFEl0o14MMfWaJy o0Ppfpw6pZMhIYA0GsUMtnNQ6Rz9YKhCvsIjIEkYM6vjWRZ0Tser+QFe9E3hz006YvRlDk9K1nY7Cif+wnsmPk1JqawQVoQi3TJonJrIJ+WY5DvhbHpW/EEo 8b7D+lC6RHmRAaBtCsRuCYjIfweWTa1BfK1yfDxk81tqMd5R/MEtqdP9u2kt+LmNTZnLJIOXxLugg/tshd1AobJl6VsgadkJk7Un8j7OQk7/kBINFdeUQMLh 1BACByyCGALbEst0tvYU29ulOraD6z0bXPdjpf/4FNl6UfLL9/tCnEa52apNEfseouC9gnwhrNN324NAsj0a1tmF6TYt0NGcaPzb5wffaYQNxZyLprIW+xfn WJc2Zpx+S2G5+xVez0a43rQ3l1XOcyNoyov2s/ZImnutQ7gNUQbmclEwOVwtu7Folqk+WN4yGYqXbzL6oiCIyevOvaUK6HZJWmmqKQ== Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Dillon and Stephen, > Il 01/08/2021 16:56 Dillon Hua ha scritto: > > > Hi Dario > > On Thu, Jul 29, 2021 at 6:03 PM Dario Binacchi wrote: > > > > Hi Dillon, > > > > > Il 28/07/2021 12:03 Dillon Hua ha scritto: > > > > > > > > > Hi Dario, > > > > > > I have a similar patch [1] submitted last year. > > > Unfortunately, it did not get accepted by the maintainer. > > > > > > Just a reminder here for you, should remove > > > > > > { STM32F4_RCC_APB2ENR, 26, "ltdc", "apb2_div" }, > > > > Thank you for your suggestion. > > While testing the patch on the stm32f469-disco board I didn't > > notice the white screen issue. I'll try to run the tests again. > > I will let you know. > > Thanks, be sure clk_ignore_unused is not set from the kernel cmdline > at your test. This is the kernel command line of my tests: console=ttySTM0,115200 root=/dev/mmcblk0p2 rw rootfstype=ext2 rootwait earlyprintk consoleblank=0 ignore_loglevel In previous emails I forgot to mention that the patch was in turn applied to a buildroot patch [1] and acked by Christophe Priouzeau of ST microelectronics. However, I rerun the tests and did not notice anything strange. I then enabled CONFIG_VT, CONFIG_FRAMEBUFFER_CONSOLE and CONFIG_LOGO, and indedd the command 'echo Dario >/dev/tty0' prints my name on the display only by removing {STM32F4_RCC_APB2ENR, 26, "ltdc", "apb2_div"}. As said in a previous email to Stephen, the patch I submitted fixes commit 517633ef630e ("clk: stm32f4: Add post divisor for I2S & SAI PLLs"), so IMHO it should not be dropped from the tree. What Dillon suggested should instead be fixed by another patch. Waiting for your opinion, Thanks and regards, Dario [1] https://patchwork.ozlabs.org/project/buildroot/patch/20210716164243.17988-1-dariobin@libero.it/ > > Best Regards > Dillon > > > > > Thanks and regards, > > Dario > > > > > > > > from stm32{f429, f469, f746, f769}_gates[]; or else > > > run into white screen after the kernel enters the console. > > > > > > This patch was verified by Patrice Chotard, you can > > > find the history from [2]. > > > > > > Hope you can help to submit a patch to include [2], thanks. > > > > > > [1] > > > https://lore.kernel.org/linux-arm-kernel/1590564453-24499-7-git-send-email-dillon.minfei@gmail.com/ > > > https://lore.kernel.org/linux-arm-kernel/1590564453-24499-6-git-send-email-dillon.minfei@gmail.com/ > > > > > > resend this year: > > > https://lore.kernel.org/lkml/1590378348-8115-6-git-send-email-dillon.minfei@gmail.com/ > > > > > > [2] > > > https://lore.kernel.org/lkml/6915fa2a-e211-476f-8317-6825e280c322@foss.st.com/ > > > > > > Thanks > > > Best Regards > > > > > > Dillon > > > > > > On Mon, Jul 26, 2021 at 12:08 AM Dario Binacchi wrote: > > > > > > > > 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 > > > > Reviewed-by: Gabriel Fernandez > > > > > > > > --- > > > > 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 > > > >