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[2003:e4:1f29:1e00:f22f:74ff:fe1f:3a53]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-45eaa93d291sm1325006f8f.36.2026.05.21.02.43.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 May 2026 02:43:58 -0700 (PDT) Date: Thu, 21 May 2026 11:43:56 +0200 From: Thierry Reding To: Diogo Ivo Cc: Mark Rutland , Lorenzo Pieralisi , Lee Jones , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Thierry Reding , Jonathan Hunter , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-tegra@vger.kernel.org Subject: Re: [PATCH 3/4] mfd: max77620: override PSCI poweroff handler on Pixel C Message-ID: References: <20260514-smaug-poweroff-v1-0-30f9a4688966@tecnico.ulisboa.pt> <20260514-smaug-poweroff-v1-3-30f9a4688966@tecnico.ulisboa.pt> <367bb557-81a0-4286-8788-0e7272cc4d02@tecnico.ulisboa.pt> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="kyo4eqmpt3lalhdw" Content-Disposition: inline In-Reply-To: <367bb557-81a0-4286-8788-0e7272cc4d02@tecnico.ulisboa.pt> --kyo4eqmpt3lalhdw Content-Type: text/plain; protected-headers=v1; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Subject: Re: [PATCH 3/4] mfd: max77620: override PSCI poweroff handler on Pixel C MIME-Version: 1.0 On Thu, May 21, 2026 at 11:23:11AM +0200, Diogo Ivo wrote: >=20 >=20 > On 5/21/26 09:52, Thierry Reding wrote: > > On Thu, May 14, 2026 at 04:47:21PM +0200, Diogo Ivo wrote: > > > On Pixel C, shutdown must be handled by the MAX77620 PMIC rather > > > than the PSCI SYSTEM_OFF call, whose firmware implementation is: > > >=20 > > > __dead2 void tegra_system_off(void) > > > { > > > ERROR("Tegra System Off: operation not handled.\n"); > > > panic(); > > > } > >=20 > > Ugh... sounds very familiar. We have similar stub implementations on > > Jetson TX1 and/or Nano, if I remember correctly. Luckily newer platforms > > seem to have proper implementations for these. >=20 > Yes, on my TX1 I was encountering the same problem. However in that case > is it possible to update the firmware with a proper implementation? I tried, but there were complications, both technical and logistical because of the point in the product lifecycle. At this point I don't think it will happen, unfortunately. 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