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charset="utf-8" X-RootMTR: 20220330080612eucas1p195caaf35d900412de762a27ae02b7b9e X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20220330080612eucas1p195caaf35d900412de762a27ae02b7b9e References: <20220325161144.1901695-1-maxime@cerno.tech> <20220325161144.1901695-4-maxime@cerno.tech> <366a0232-bb4a-c357-6aa8-636e398e05eb@samsung.com> <20220330084710.3r6b5pjspz5hdmy6@houat> Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org Hi, On 30.03.2022 10:47, Maxime Ripard wrote: > On Wed, Mar 30, 2022 at 10:06:13AM +0200, Marek Szyprowski wrote: >> On 25.03.2022 17:11, Maxime Ripard wrote: >>> While the current code will trigger a new clk_set_rate call whenever the >>> rate boundaries are changed through clk_set_rate_range, this doesn't >>> occur when clk_put() is called. >>> >>> However, this is essentially equivalent since, after clk_put() >>> completes, those boundaries won't be enforced anymore. >>> >>> Let's add a call to clk_set_rate_range in clk_put to make sure those >>> rate boundaries are dropped and the clock drivers can react. >>> >>> Let's also add a few tests to make sure this case is covered. >>> >>> Fixes: c80ac50cbb37 ("clk: Always set the rate on clk_set_range_rate") >>> Signed-off-by: Maxime Ripard >> This patch landed recently in linux-next 20220328 as commit 7dabfa2bc480 >> ("clk: Drop the rate range on clk_put()"). Sadly it breaks booting of >> the few of my test systems: Samsung ARM 32bit Exynos3250 based Rinato >> board and all Amlogic Meson G12B/SM1 based boards (Odroid C4, N2, Khadas >> VIM3/VIM3l). Rinato hangs always with the following oops: >> >> --->8--- >> >> Kernel panic - not syncing: MCT hangs after writing 4 (offset:0x420) >> CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.17.0-rc1-00014-g7dabfa2bc480 >> #11551 >> Hardware name: Samsung Exynos (Flattened Device Tree) >>  unwind_backtrace from show_stack+0x10/0x14 >>  show_stack from dump_stack_lvl+0x58/0x70 >>  dump_stack_lvl from panic+0x10c/0x328 >>  panic from exynos4_mct_tick_stop+0x0/0x2c >> ---[ end Kernel panic - not syncing: MCT hangs after writing 4 >> (offset:0x420) ]--- >> >> --->8--- >> >> Amlogic boards hang randomly during early userspace init, usually just >> after loading the driver modules. >> >> Reverting $subject on top of linux-next fixes all those problems. >> >> I will try to analyze it a bit more and if possible provide some more >> useful/meaning full logs later. > I'm not sure what could go wrong there, but if you can figure out the > clock, if it tries to set a new rate and what rate it is, it would be > awesome :) So far I've noticed that the problem is caused by setting rate of some clocks to zero. The following patch fixes my issues: diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index 32a9eaf35c6b..39cab08dbecb 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -2201,6 +2201,9 @@ static int clk_core_set_rate_nolock(struct clk_core *core,         if (!core)                 return 0; +       if (req_rate == 0) +               return 0; +         rate = clk_core_req_round_rate_nolock(core, req_rate);         /* bail early if nothing to do */ -- I will soon grab the call stack and relevant clock topology show how the rate is set to zero. Best regards -- Marek Szyprowski, PhD Samsung R&D Institute Poland From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 54493C433F5 for ; Thu, 31 Mar 2022 09:57:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:References:In-Reply-To:From:Cc:To: Subject:MIME-Version:Date:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=QFgLrirh7psySn7b7a6H6H9rx1d/zl0z3ml0f+Bx7YU=; b=Gc+w8JKrPAlleW sNDgU/Ys3Xiu1XAX2gCcquI943qGu5zQWytvVe+HL+tDtbGc/ZlYc/XMrwr4iCPPudRnpkgblBuqz G70bo2VHBI75Z7T/paW08HAphmmpJUbIsAcL7eLSdKErbQWsQgCbu4fVdHpYgdwmvk/tzgdClVklG bUv8RvhmpwwXWDhZwtyC5EVqd1xoII/DeJL3Lcbg1VjcmG2ZLuZLbTIlcJWqXJ4Ik6POlHV1Y7+dv bSTEfu7iDrebHgayZcpixtIkEL15UZgSX5hYAlwNkQbXE1KPBLcFUfdEWqcfX63lWPcD4Eq3vsakh qmZtiO4PWJE+zU5D/03A==; 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Thu, 31 Mar 2022 09:56:52 +0000 (GMT) Message-ID: <7465a7dc-c45e-2612-4c39-d15eceb9b75c@samsung.com> Date: Thu, 31 Mar 2022 11:56:51 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.7.0 Subject: Re: [PATCH v2 3/3] clk: Drop the rate range on clk_put Content-Language: en-US To: Maxime Ripard Cc: Mike Turquette , Stephen Boyd , linux-clk@vger.kernel.org, Dmitry Osipenko , 'Linux Samsung SOC' , linux-amlogic@lists.infradead.org From: Marek Szyprowski In-Reply-To: <20220330084710.3r6b5pjspz5hdmy6@houat> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprNKsWRmVeSWpSXmKPExsWy7djP87pPq1yTDDomMFqcfHKd3WLBbG6L jz33WC1mnN/HZDHjxz9Gi4unXC3+XdvI4sDu8f5GK7vHnXPn2Tx23F3C6LFpVSebx+Yl9R6f N8kFsEVx2aSk5mSWpRbp2yVwZaxZdYOl4KJ4RfdlqwbGlcJdjJwcEgImEs83rGTqYuTiEBJY wSix5vhlRgjnC6PEu5mvoZzPQM6iVexdjBxgLUsvhELElzNKXDn/gB3C+cgo0XtmHzvIXF4B O4lDP/6D2SwCqhLzrjSxQcQFJU7OfMICYosKJEms3r4aLC4sYC9xZWczI4jNLCAucevJfCYQ WwSo90rvXmaI+G9GiTMf5UFsNgFDia63XWwgB3ECHdS+IxqiRF6ieetsZpB7JATucEjs2ryW HeJPF4kpk28yQtjCEq+Ob4GKy0icntzDAvFYvsTfGcYQ4QqJa6/XMEPY1hJ3zv0CW8UsoCmx fpc+RNhRYtbcLWwQnXwSN94KQlzAJzFp23RmiDCvREebEES1msSs4+vgdh68cIl5AqPSLKQg mYXk9VlIfpmFsHcBI8sqRvHU0uLc9NRio7zUcr3ixNzi0rx0veT83E2MwPRz+t/xLzsYl7/6 qHeIkYmD8RCjBAezkgjv1VjXJCHelMTKqtSi/Pii0pzU4kOM0hwsSuK8yZkbEoUE0hNLUrNT UwtSi2CyTBycUg1MxnIe//wFF4gXr6prmPpnv8f5q3xOe+Uvc87Z7niPO+7EVT+NWa6em30f rmdtWOTdPreARUwiNq4iO01fL/C9z5EtzfyNLiW7Poecz8gx+KQnvGn/hqDwzLVyexQOr1iU FDphh/Xa2Voed/1+r4qy/X6vfqaKV1fo8ZuXOW7nrinV1V/nV7HWql7NXHOX4ZrtxlacmxiF Did5nxb2WnTA62/IrYOHfZ/q3k/Lujp9zcYF3hcbS4rmz1mdUse06iKbxRSVSwUedjrKs7W3 x7QHlAQ+4vuQsLLOue/Yg6ZNSVHrU9v/9S+x6q/vyOJ/e1lHfNWOT2sUdDZO9PoRpaypa2Vz 9tS3jUFXu94VPhdWYinOSDTUYi4qTgQARoq1pq4DAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrIIsWRmVeSWpSXmKPExsVy+t/xu7pPqlyTDBZuVLQ4+eQ6u8WC2dwW H3vusVrMOL+PyWLGj3+MFhdPuVr8u7aRxYHd4/2NVnaPO+fOs3nsuLuE0WPTqk42j81L6j0+ b5ILYIvSsynKLy1JVcjILy6xVYo2tDDSM7S00DMysdQzNDaPtTIyVdK3s0lJzcksSy3St0vQ y1iz6gZLwUXxiu7LVg2MK4W7GDk4JARMJJZeCO1i5OIQEljKKLG+o5+pi5ETKC4jcXJaAyuE LSzx51oXG0TRe0aJix+XsIMkeAXsJA79+A9mswioSsy70sQGEReUODnzCQuILSqQJHGpq50R xBYWsJe4srMZzGYWEJe49WQ+2DIRoN4rvXuZQRYwC/xllNi+5ysrxLZZTBKz/twCm8QmYCjR 9RbkDA4OTqCz23dEQwwyk+ja2gU1VF6ieets5gmMQrOQ3DELyb5ZSFpmIWlZwMiyilEktbQ4 Nz232FCvODG3uDQvXS85P3cTIzDuth37uXkH47xXH/UOMTJxMB5ilOBgVhLhvRrrmiTEm5JY WZValB9fVJqTWnyI0RQYGBOZpUST84GRn1cSb2hmYGpoYmZpYGppZqwkzutZ0JEoJJCeWJKa nZpakFoE08fEwSnVwLRDof5PA+ejuI0XtDYvdvQILbqvPu111YPgKE8lNr7k5UsLhJ+I+b1K dDzYvkk4jVFN1WLGZIuCBCXO7fMjI/92ZCRcX23xw35xdshN3iNrlztuPtebqXy96anWKpYE Bz+fGQ0fNjTLfGh36pvOuXuR88wThR7uzc35yzf9/vFlhwxb6cTeWcazXt7y2FJ55K9yfVi9 gO0u7XRf2WPtOyMO5sWV7/+459T0WskoLzdb9i0M4XMKVb97X1P723F8GscL3iOvPmYnOphs 0Y6vZ3x66n+J65Pa0gWZImzSWS07WRy5mh4d+n07085+TbDE8VSXzFglD+G6L65WZ/9aMK4+ /bNWac63aS/2iV88r8RSnJFoqMVcVJwIAG1LOmJEAwAA X-CMS-MailID: 20220331095652eucas1p2d06107b8c2a39bec14fcd67d001429d7 X-Msg-Generator: CA X-RootMTR: 20220330080612eucas1p195caaf35d900412de762a27ae02b7b9e X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20220330080612eucas1p195caaf35d900412de762a27ae02b7b9e References: <20220325161144.1901695-1-maxime@cerno.tech> <20220325161144.1901695-4-maxime@cerno.tech> <366a0232-bb4a-c357-6aa8-636e398e05eb@samsung.com> <20220330084710.3r6b5pjspz5hdmy6@houat> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220331_025656_250290_952F8333 X-CRM114-Status: GOOD ( 20.77 ) X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org SGksCgpPbiAzMC4wMy4yMDIyIDEwOjQ3LCBNYXhpbWUgUmlwYXJkIHdyb3RlOgo+IE9uIFdlZCwg TWFyIDMwLCAyMDIyIGF0IDEwOjA2OjEzQU0gKzAyMDAsIE1hcmVrIFN6eXByb3dza2kgd3JvdGU6 Cj4+IE9uIDI1LjAzLjIwMjIgMTc6MTEsIE1heGltZSBSaXBhcmQgd3JvdGU6Cj4+PiBXaGlsZSB0 aGUgY3VycmVudCBjb2RlIHdpbGwgdHJpZ2dlciBhIG5ldyBjbGtfc2V0X3JhdGUgY2FsbCB3aGVu ZXZlciB0aGUKPj4+IHJhdGUgYm91bmRhcmllcyBhcmUgY2hhbmdlZCB0aHJvdWdoIGNsa19zZXRf cmF0ZV9yYW5nZSwgdGhpcyBkb2Vzbid0Cj4+PiBvY2N1ciB3aGVuIGNsa19wdXQoKSBpcyBjYWxs ZWQuCj4+Pgo+Pj4gSG93ZXZlciwgdGhpcyBpcyBlc3NlbnRpYWxseSBlcXVpdmFsZW50IHNpbmNl LCBhZnRlciBjbGtfcHV0KCkKPj4+IGNvbXBsZXRlcywgdGhvc2UgYm91bmRhcmllcyB3b24ndCBi ZSBlbmZvcmNlZCBhbnltb3JlLgo+Pj4KPj4+IExldCdzIGFkZCBhIGNhbGwgdG8gY2xrX3NldF9y YXRlX3JhbmdlIGluIGNsa19wdXQgdG8gbWFrZSBzdXJlIHRob3NlCj4+PiByYXRlIGJvdW5kYXJp ZXMgYXJlIGRyb3BwZWQgYW5kIHRoZSBjbG9jayBkcml2ZXJzIGNhbiByZWFjdC4KPj4+Cj4+PiBM ZXQncyBhbHNvIGFkZCBhIGZldyB0ZXN0cyB0byBtYWtlIHN1cmUgdGhpcyBjYXNlIGlzIGNvdmVy ZWQuCj4+Pgo+Pj4gRml4ZXM6IGM4MGFjNTBjYmIzNyAoImNsazogQWx3YXlzIHNldCB0aGUgcmF0 ZSBvbiBjbGtfc2V0X3JhbmdlX3JhdGUiKQo+Pj4gU2lnbmVkLW9mZi1ieTogTWF4aW1lIFJpcGFy ZCA8bWF4aW1lQGNlcm5vLnRlY2g+Cj4+IFRoaXMgcGF0Y2ggbGFuZGVkIHJlY2VudGx5IGluIGxp bnV4LW5leHQgMjAyMjAzMjggYXMgY29tbWl0IDdkYWJmYTJiYzQ4MAo+PiAoImNsazogRHJvcCB0 aGUgcmF0ZSByYW5nZSBvbiBjbGtfcHV0KCkiKS4gU2FkbHkgaXQgYnJlYWtzIGJvb3Rpbmcgb2YK Pj4gdGhlIGZldyBvZiBteSB0ZXN0IHN5c3RlbXM6IFNhbXN1bmcgQVJNIDMyYml0IEV4eW5vczMy NTAgYmFzZWQgUmluYXRvCj4+IGJvYXJkIGFuZCBhbGwgQW1sb2dpYyBNZXNvbiBHMTJCL1NNMSBi YXNlZCBib2FyZHMgKE9kcm9pZCBDNCwgTjIsIEtoYWRhcwo+PiBWSU0zL1ZJTTNsKS4gUmluYXRv IGhhbmdzIGFsd2F5cyB3aXRoIHRoZSBmb2xsb3dpbmcgb29wczoKPj4KPj4gLS0tPjgtLS0KPj4K Pj4gS2VybmVsIHBhbmljIC0gbm90IHN5bmNpbmc6IE1DVCBoYW5ncyBhZnRlciB3cml0aW5nIDQg KG9mZnNldDoweDQyMCkKPj4gQ1BVOiAxIFBJRDogMCBDb21tOiBzd2FwcGVyLzEgTm90IHRhaW50 ZWQgNS4xNy4wLXJjMS0wMDAxNC1nN2RhYmZhMmJjNDgwCj4+ICMxMTU1MQo+PiBIYXJkd2FyZSBu YW1lOiBTYW1zdW5nIEV4eW5vcyAoRmxhdHRlbmVkIERldmljZSBUcmVlKQo+PiAgIMKgdW53aW5k X2JhY2t0cmFjZSBmcm9tIHNob3dfc3RhY2srMHgxMC8weDE0Cj4+ICAgwqBzaG93X3N0YWNrIGZy b20gZHVtcF9zdGFja19sdmwrMHg1OC8weDcwCj4+ICAgwqBkdW1wX3N0YWNrX2x2bCBmcm9tIHBh bmljKzB4MTBjLzB4MzI4Cj4+ICAgwqBwYW5pYyBmcm9tIGV4eW5vczRfbWN0X3RpY2tfc3RvcCsw eDAvMHgyYwo+PiAtLS1bIGVuZCBLZXJuZWwgcGFuaWMgLSBub3Qgc3luY2luZzogTUNUIGhhbmdz IGFmdGVyIHdyaXRpbmcgNAo+PiAob2Zmc2V0OjB4NDIwKSBdLS0tCj4+Cj4+IC0tLT44LS0tCj4+ Cj4+IEFtbG9naWMgYm9hcmRzIGhhbmcgcmFuZG9tbHkgZHVyaW5nIGVhcmx5IHVzZXJzcGFjZSBp bml0LCB1c3VhbGx5IGp1c3QKPj4gYWZ0ZXIgbG9hZGluZyB0aGUgZHJpdmVyIG1vZHVsZXMuCj4+ Cj4+IFJldmVydGluZyAkc3ViamVjdCBvbiB0b3Agb2YgbGludXgtbmV4dCBmaXhlcyBhbGwgdGhv c2UgcHJvYmxlbXMuCj4+Cj4+IEkgd2lsbCB0cnkgdG8gYW5hbHl6ZSBpdCBhIGJpdCBtb3JlIGFu ZCBpZiBwb3NzaWJsZSBwcm92aWRlIHNvbWUgbW9yZQo+PiB1c2VmdWwvbWVhbmluZyBmdWxsIGxv Z3MgbGF0ZXIuCj4gSSdtIG5vdCBzdXJlIHdoYXQgY291bGQgZ28gd3JvbmcgdGhlcmUsIGJ1dCBp ZiB5b3UgY2FuIGZpZ3VyZSBvdXQgdGhlCj4gY2xvY2ssIGlmIGl0IHRyaWVzIHRvIHNldCBhIG5l dyByYXRlIGFuZCB3aGF0IHJhdGUgaXQgaXMsIGl0IHdvdWxkIGJlCj4gYXdlc29tZSA6KQoKU28g ZmFyIEkndmUgbm90aWNlZCB0aGF0IHRoZSBwcm9ibGVtIGlzIGNhdXNlZCBieSBzZXR0aW5nIHJh dGUgb2Ygc29tZSAKY2xvY2tzIHRvIHplcm8uIFRoZSBmb2xsb3dpbmcgcGF0Y2ggZml4ZXMgbXkg aXNzdWVzOgoKZGlmZiAtLWdpdCBhL2RyaXZlcnMvY2xrL2Nsay5jIGIvZHJpdmVycy9jbGsvY2xr LmMKaW5kZXggMzJhOWVhZjM1YzZiLi4zOWNhYjA4ZGJlY2IgMTAwNjQ0Ci0tLSBhL2RyaXZlcnMv Y2xrL2Nsay5jCisrKyBiL2RyaXZlcnMvY2xrL2Nsay5jCkBAIC0yMjAxLDYgKzIyMDEsOSBAQCBz dGF0aWMgaW50IGNsa19jb3JlX3NldF9yYXRlX25vbG9jayhzdHJ1Y3QgCmNsa19jb3JlICpjb3Jl LAogwqDCoMKgwqDCoMKgwqAgaWYgKCFjb3JlKQogwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDC oMKgIHJldHVybiAwOwoKK8KgwqDCoMKgwqDCoCBpZiAocmVxX3JhdGUgPT0gMCkKK8KgwqDCoMKg wqDCoMKgwqDCoMKgwqDCoMKgwqAgcmV0dXJuIDA7CisKIMKgwqDCoMKgwqDCoMKgIHJhdGUgPSBj bGtfY29yZV9yZXFfcm91bmRfcmF0ZV9ub2xvY2soY29yZSwgcmVxX3JhdGUpOwoKIMKgwqDCoMKg wqDCoMKgIC8qIGJhaWwgZWFybHkgaWYgbm90aGluZyB0byBkbyAqLwotLQoKSSB3aWxsIHNvb24g Z3JhYiB0aGUgY2FsbCBzdGFjayBhbmQgcmVsZXZhbnQgY2xvY2sgdG9wb2xvZ3kgc2hvdyBob3cg dGhlIApyYXRlIGlzIHNldCB0byB6ZXJvLgoKQmVzdCByZWdhcmRzCi0tIApNYXJlayBTenlwcm93 c2tpLCBQaEQKU2Ftc3VuZyBSJkQgSW5zdGl0dXRlIFBvbGFuZAoKCl9fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCmxpbnV4LWFtbG9naWMgbWFpbGluZyBsaXN0 CmxpbnV4LWFtbG9naWNAbGlzdHMuaW5mcmFkZWFkLm9yZwpodHRwOi8vbGlzdHMuaW5mcmFkZWFk Lm9yZy9tYWlsbWFuL2xpc3RpbmZvL2xpbnV4LWFtbG9naWMK