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Tue, 9 Feb 2021 21:08:08 -0500 (EST) X-Mailer: MessagingEngine.com Webmail Interface User-Agent: Cyrus-JMAP/3.5.0-alpha0-93-gef6c4048e6-fm-20210128.002-gef6c4048 Mime-Version: 1.0 Message-Id: In-Reply-To: <1cd0c2ee-aa3a-4da2-9c0c-57cc5a1dad49@www.fastmail.com> References: <20210209213330.hnc7op72zoj24mgz@pali> <7b0988cc-eeb8-4ea7-92f6-e8234ca910d3@www.fastmail.com> <20210209224223.p22yhjdy7ibzepss@pali> <93745280-dbe9-491c-a79d-c9c364b83880@www.fastmail.com> <20210209225630.mdwnzkvnaz3r4blt@pali> <20210210002619.43104a9b@kernel.org> <1cd0c2ee-aa3a-4da2-9c0c-57cc5a1dad49@www.fastmail.com> Date: Tue, 09 Feb 2021 18:07:41 -0800 From: nnet To: =?UTF-8?Q?Marek_Beh=C3=BAn?= Cc: =?UTF-8?Q?Pali_Roh=C3=A1r?= , a.heider@gmail.com, andrew@lunn.ch, gerald@gk2.net, gregory.clement@bootlin.com, kostap@marvell.com, linux-arm-kernel@lists.infradead.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, luka.perkov@sartura.hr, miquel.raynal@bootlin.com, mturquette@baylibre.com, rmk+kernel@armlinux.org.uk, sboyd@kernel.org, tmn505@gmail.com, vladimir.vid@sartura.hr Subject: =?UTF-8?Q?Re:_[PATCH_mvebu_v2_00/10]_Armada_37xx:_Fix_cpufreq_changing_b?= =?UTF-8?Q?ase_CPU_speed_to_800_MHz_from_1000_MHz?= Content-Type: text/plain;charset=utf-8 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Feb 9, 2021, at 5:51 PM, nnet wrote: > On Tue, Feb 9, 2021, at 5:31 PM, nnet wrote: > > On Tue, Feb 9, 2021, at 3:26 PM, Marek Beh=C3=BAn wrote: > > > On Tue, 09 Feb 2021 15:16:45 -0800 > > > nnet wrote: > > >=20 > > > > I've two of these and I've just swapped them (and re-pasted the = heat sinks). > > > >=20 > > > > The second one ran under load for awhile and now has frozen as w= ell. > > > >=20 > > > > Under a moderate load `wget -O /dev/null ` @X00Mbits = they are fine. > > > >=20 > > > > Under a 1 min speed test of load ~200Mbits routed WireGuard they= freeze. > > > >=20 > > > > They fine with both those workloads @1000_800. > > > >=20 > > > > Perhaps it's heat? Unfortunately I don't have any numbers on tha= t ATM. > > >=20 > > > Try disabling cpufreq in kernel completely, compile boot image at > > > 1200 MHz. If it continues freezing, then I fear we can't help you = with > > > 1200 MHz :( > >=20 > > cat /sys/devices/system/cpu/cpufreq/policy0/scaling_available_freque= ncies=20 > > 200000 300000 600000 1200000=20 > >=20 > > I'm not getting any freezes with 1.2GHz fixed after 20 minutes of lo= ad: > >=20 > > echo 1200000 > /sys/devices/system/cpu/cpufreq/policy0/scaling_min_f= req > >=20 > > Setting it back to min 200MHz I get a freeze within a minute: > >=20 > > echo 200000 > /sys/devices/system/cpu/cpufreq/policy0/scaling_min_fr= eq > >=20 > > > Marek > > > >=20 > > +#define MIN_VOLT_MV_FOR_L0_L1_1GHZ 1108 >=20 > Based on the below at boot time might an equivalent of the above need=20= > to be 1225 for 1.2GHz? >=20 > 1200_750 > SVC REV: 5, CPU VDD voltage: 1.225V >=20 > 1000_800 > SVC REV: 5, CPU VDD voltage: 1.108V I did this for a quick test for 1.2GHz: +#define MIN_VOLT_MV_FOR_L0_L1_1GHZ 1225 This is working well so far. Frequency is shifting up/down with load app= lied/stopped.