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([2001:861:44c0:66c0:97e4:3830:c79:136e]) by smtp.gmail.com with ESMTPSA id 2sm23666644wrz.59.2022.02.11.01.25.44 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 11 Feb 2022 01:25:44 -0800 (PST) Message-ID: <3a60384a-b26f-3591-fca9-b10764bd2b24@baylibre.com> Date: Fri, 11 Feb 2022 10:25:43 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.5.0 Subject: Re: [PATCH v2 2/2] arm64: dts: meson: remove CPU opps below 1GHz for SM1 boards Content-Language: en-US To: Marc Zyngier , Christian Hewitt Cc: Rob Herring , Mark Rutland , Kevin Hilman , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org References: <20220210100638.19130-1-christianshewitt@gmail.com> <20220210100638.19130-3-christianshewitt@gmail.com> <8211344a481dd40f260106bdd3f03bfb@kernel.org> From: Neil Armstrong Organization: Baylibre In-Reply-To: <8211344a481dd40f260106bdd3f03bfb@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Marc, On 10/02/2022 11:36, Marc Zyngier wrote: > On 2022-02-10 10:06, Christian Hewitt wrote: >> Amlogic SM1 devices experience CPU stalls and random board wedges when >> the system idles and CPU cores clock down to lower opp points. Recent >> vendor kernels include a change to remove 100-250MHz and other distro >> sources also remove the 500/667MHz points. Unless all 100-667Mhz opps >> are removed or the CPU governor forced to performance stalls are still >> observed, so let's remove them to improve stability and uptime. >> >> Fixes: 3d9e76483049 ("arm64: dts: meson-sm1-sei610: enable DVFS") >> Signed-off-by: Christian Hewitt >> --- >>  arch/arm64/boot/dts/amlogic/meson-sm1.dtsi | 20 -------------------- >>  1 file changed, 20 deletions(-) >> >> diff --git a/arch/arm64/boot/dts/amlogic/meson-sm1.dtsi >> b/arch/arm64/boot/dts/amlogic/meson-sm1.dtsi >> index 3c07a89bfd27..80737731af3f 100644 >> --- a/arch/arm64/boot/dts/amlogic/meson-sm1.dtsi >> +++ b/arch/arm64/boot/dts/amlogic/meson-sm1.dtsi >> @@ -95,26 +95,6 @@ >>          compatible = "operating-points-v2"; >>          opp-shared; >> >> -        opp-100000000 { >> -            opp-hz = /bits/ 64 <100000000>; >> -            opp-microvolt = <730000>; >> -        }; >> - >> -        opp-250000000 { >> -            opp-hz = /bits/ 64 <250000000>; >> -            opp-microvolt = <730000>; >> -        }; >> - >> -        opp-500000000 { >> -            opp-hz = /bits/ 64 <500000000>; >> -            opp-microvolt = <730000>; >> -        }; >> - >> -        opp-667000000 { >> -            opp-hz = /bits/ 64 <666666666>; >> -            opp-microvolt = <750000>; >> -        }; >> - >>          opp-1000000000 { >>              opp-hz = /bits/ 64 <1000000000>; >>              opp-microvolt = <770000>; > > That's not nearly enough. If that's an actual issue, the driver > should be updated not to use these OPPs, and you can't assume > that people will just update their DT (mine comes from u-boot, > and it is unlikely I will update it anytime soon). The driver is the generic cpufreq and a generic clock driver, we do not filter out the possible OPP frequencies because the possible freq is large and depends on the die revision. I don't see why we should filter out these frequencies so far. Neil > > Thanks, > >         M. 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([2001:861:44c0:66c0:97e4:3830:c79:136e]) by smtp.gmail.com with ESMTPSA id 2sm23666644wrz.59.2022.02.11.01.25.44 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 11 Feb 2022 01:25:44 -0800 (PST) Message-ID: <3a60384a-b26f-3591-fca9-b10764bd2b24@baylibre.com> Date: Fri, 11 Feb 2022 10:25:43 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.5.0 Subject: Re: [PATCH v2 2/2] arm64: dts: meson: remove CPU opps below 1GHz for SM1 boards Content-Language: en-US To: Marc Zyngier , Christian Hewitt Cc: Rob Herring , Mark Rutland , Kevin Hilman , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org References: <20220210100638.19130-1-christianshewitt@gmail.com> <20220210100638.19130-3-christianshewitt@gmail.com> <8211344a481dd40f260106bdd3f03bfb@kernel.org> From: Neil Armstrong Organization: Baylibre In-Reply-To: <8211344a481dd40f260106bdd3f03bfb@kernel.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220211_012547_679903_04A86E6B X-CRM114-Status: GOOD ( 18.23 ) 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-Transfer-Encoding: base64 Content-Type: text/plain; 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([2001:861:44c0:66c0:97e4:3830:c79:136e]) by smtp.gmail.com with ESMTPSA id 2sm23666644wrz.59.2022.02.11.01.25.44 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 11 Feb 2022 01:25:44 -0800 (PST) Message-ID: <3a60384a-b26f-3591-fca9-b10764bd2b24@baylibre.com> Date: Fri, 11 Feb 2022 10:25:43 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.5.0 Subject: Re: [PATCH v2 2/2] arm64: dts: meson: remove CPU opps below 1GHz for SM1 boards Content-Language: en-US To: Marc Zyngier , Christian Hewitt Cc: Rob Herring , Mark Rutland , Kevin Hilman , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org References: <20220210100638.19130-1-christianshewitt@gmail.com> <20220210100638.19130-3-christianshewitt@gmail.com> <8211344a481dd40f260106bdd3f03bfb@kernel.org> From: Neil Armstrong Organization: Baylibre In-Reply-To: <8211344a481dd40f260106bdd3f03bfb@kernel.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220211_012547_707726_08270974 X-CRM114-Status: GOOD ( 19.86 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org SGkgTWFyYywKCk9uIDEwLzAyLzIwMjIgMTE6MzYsIE1hcmMgWnluZ2llciB3cm90ZToKPiBPbiAy MDIyLTAyLTEwIDEwOjA2LCBDaHJpc3RpYW4gSGV3aXR0IHdyb3RlOgo+PiBBbWxvZ2ljIFNNMSBk ZXZpY2VzIGV4cGVyaWVuY2UgQ1BVIHN0YWxscyBhbmQgcmFuZG9tIGJvYXJkIHdlZGdlcyB3aGVu Cj4+IHRoZSBzeXN0ZW0gaWRsZXMgYW5kIENQVSBjb3JlcyBjbG9jayBkb3duIHRvIGxvd2VyIG9w cCBwb2ludHMuIFJlY2VudAo+PiB2ZW5kb3Iga2VybmVscyBpbmNsdWRlIGEgY2hhbmdlIHRvIHJl bW92ZSAxMDAtMjUwTUh6IGFuZCBvdGhlciBkaXN0cm8KPj4gc291cmNlcyBhbHNvIHJlbW92ZSB0 aGUgNTAwLzY2N01IeiBwb2ludHMuIFVubGVzcyBhbGwgMTAwLTY2N01oeiBvcHBzCj4+IGFyZSBy ZW1vdmVkIG9yIHRoZSBDUFUgZ292ZXJub3IgZm9yY2VkIHRvIHBlcmZvcm1hbmNlIHN0YWxscyBh cmUgc3RpbGwKPj4gb2JzZXJ2ZWQsIHNvIGxldCdzIHJlbW92ZSB0aGVtIHRvIGltcHJvdmUgc3Rh YmlsaXR5IGFuZCB1cHRpbWUuCj4+Cj4+IEZpeGVzOiAzZDllNzY0ODMwNDkgKCJhcm02NDogZHRz OiBtZXNvbi1zbTEtc2VpNjEwOiBlbmFibGUgRFZGUyIpCj4+IFNpZ25lZC1vZmYtYnk6IENocmlz dGlhbiBIZXdpdHQgPGNocmlzdGlhbnNoZXdpdHRAZ21haWwuY29tPgo+PiAtLS0KPj4gwqBhcmNo L2FybTY0L2Jvb3QvZHRzL2FtbG9naWMvbWVzb24tc20xLmR0c2kgfCAyMCAtLS0tLS0tLS0tLS0t LS0tLS0tLQo+PiDCoDEgZmlsZSBjaGFuZ2VkLCAyMCBkZWxldGlvbnMoLSkKPj4KPj4gZGlmZiAt LWdpdCBhL2FyY2gvYXJtNjQvYm9vdC9kdHMvYW1sb2dpYy9tZXNvbi1zbTEuZHRzaQo+PiBiL2Fy Y2gvYXJtNjQvYm9vdC9kdHMvYW1sb2dpYy9tZXNvbi1zbTEuZHRzaQo+PiBpbmRleCAzYzA3YTg5 YmZkMjcuLjgwNzM3NzMxYWYzZiAxMDA2NDQKPj4gLS0tIGEvYXJjaC9hcm02NC9ib290L2R0cy9h bWxvZ2ljL21lc29uLXNtMS5kdHNpCj4+ICsrKyBiL2FyY2gvYXJtNjQvYm9vdC9kdHMvYW1sb2dp Yy9tZXNvbi1zbTEuZHRzaQo+PiBAQCAtOTUsMjYgKzk1LDYgQEAKPj4gwqDCoMKgwqDCoMKgwqDC oCBjb21wYXRpYmxlID0gIm9wZXJhdGluZy1wb2ludHMtdjIiOwo+PiDCoMKgwqDCoMKgwqDCoMKg IG9wcC1zaGFyZWQ7Cj4+Cj4+IC3CoMKgwqDCoMKgwqDCoCBvcHAtMTAwMDAwMDAwIHsKPj4gLcKg wqDCoMKgwqDCoMKgwqDCoMKgwqAgb3BwLWh6ID0gL2JpdHMvIDY0IDwxMDAwMDAwMDA+Owo+PiAt wqDCoMKgwqDCoMKgwqDCoMKgwqDCoCBvcHAtbWljcm92b2x0ID0gPDczMDAwMD47Cj4+IC3CoMKg wqDCoMKgwqDCoCB9Owo+PiAtCj4+IC3CoMKgwqDCoMKgwqDCoCBvcHAtMjUwMDAwMDAwIHsKPj4g LcKgwqDCoMKgwqDCoMKgwqDCoMKgwqAgb3BwLWh6ID0gL2JpdHMvIDY0IDwyNTAwMDAwMDA+Owo+ PiAtwqDCoMKgwqDCoMKgwqDCoMKgwqDCoCBvcHAtbWljcm92b2x0ID0gPDczMDAwMD47Cj4+IC3C oMKgwqDCoMKgwqDCoCB9Owo+PiAtCj4+IC3CoMKgwqDCoMKgwqDCoCBvcHAtNTAwMDAwMDAwIHsK Pj4gLcKgwqDCoMKgwqDCoMKgwqDCoMKgwqAgb3BwLWh6ID0gL2JpdHMvIDY0IDw1MDAwMDAwMDA+ Owo+PiAtwqDCoMKgwqDCoMKgwqDCoMKgwqDCoCBvcHAtbWljcm92b2x0ID0gPDczMDAwMD47Cj4+ IC3CoMKgwqDCoMKgwqDCoCB9Owo+PiAtCj4+IC3CoMKgwqDCoMKgwqDCoCBvcHAtNjY3MDAwMDAw IHsKPj4gLcKgwqDCoMKgwqDCoMKgwqDCoMKgwqAgb3BwLWh6ID0gL2JpdHMvIDY0IDw2NjY2NjY2 NjY+Owo+PiAtwqDCoMKgwqDCoMKgwqDCoMKgwqDCoCBvcHAtbWljcm92b2x0ID0gPDc1MDAwMD47 Cj4+IC3CoMKgwqDCoMKgwqDCoCB9Owo+PiAtCj4+IMKgwqDCoMKgwqDCoMKgwqAgb3BwLTEwMDAw MDAwMDAgewo+PiDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqAgb3BwLWh6ID0gL2JpdHMvIDY0IDwx MDAwMDAwMDAwPjsKPj4gwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgIG9wcC1taWNyb3ZvbHQgPSA8 NzcwMDAwPjsKPiAKPiBUaGF0J3Mgbm90IG5lYXJseSBlbm91Z2guIElmIHRoYXQncyBhbiBhY3R1 YWwgaXNzdWUsIHRoZSBkcml2ZXIKPiBzaG91bGQgYmUgdXBkYXRlZCBub3QgdG8gdXNlIHRoZXNl IE9QUHMsIGFuZCB5b3UgY2FuJ3QgYXNzdW1lCj4gdGhhdCBwZW9wbGUgd2lsbCBqdXN0IHVwZGF0 ZSB0aGVpciBEVCAobWluZSBjb21lcyBmcm9tIHUtYm9vdCwKPiBhbmQgaXQgaXMgdW5saWtlbHkg SSB3aWxsIHVwZGF0ZSBpdCBhbnl0aW1lIHNvb24pLgoKVGhlIGRyaXZlciBpcyB0aGUgZ2VuZXJp YyBjcHVmcmVxIGFuZCBhIGdlbmVyaWMgY2xvY2sgZHJpdmVyLCB3ZSBkbyBub3QKZmlsdGVyIG91 dCB0aGUgcG9zc2libGUgT1BQIGZyZXF1ZW5jaWVzIGJlY2F1c2UgdGhlIHBvc3NpYmxlIGZyZXEK aXMgbGFyZ2UgYW5kIGRlcGVuZHMgb24gdGhlIGRpZSByZXZpc2lvbi4KCkkgZG9uJ3Qgc2VlIHdo eSB3ZSBzaG91bGQgZmlsdGVyIG91dCB0aGVzZSBmcmVxdWVuY2llcyBzbyBmYXIuCgpOZWlsCgo+ IAo+IFRoYW5rcywKPiAKPiAgwqDCoMKgwqDCoMKgwqAgTS4KCgpfX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fXwpsaW51eC1hcm0ta2VybmVsIG1haWxpbmcgbGlz dApsaW51eC1hcm0ta2VybmVsQGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xpc3RzLmluZnJh ZGVhZC5vcmcvbWFpbG1hbi9saXN0aW5mby9saW51eC1hcm0ta2VybmVsCg==