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Mon, 26 Oct 2026 23:54:53 -0700 (PDT) Received: from localhost.localdomain (dynamic-2a02-3100-b2ac-9b01-6900-1f92-d182-4435.310.pool.telefonica.de. [2a02:3100:b2ac:9b01:6900:1f92:d182:4435]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4a4cb7bece3sm189318425e9.10.2026.10.26.23.54.52 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Mon, 26 Oct 2026 23:54:52 -0700 (PDT) From: Karl Mehltretter To: Mikko Perttunen Cc: Karl Mehltretter , Thierry Reding , Jonathan Hunter , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Aaron Kling , linux-tegra@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: Re: [PATCH 0/2] Fix NVDEC boot on Tegra210 Date: Tue, 27 Oct 2026 07:54:46 +0100 Message-Id: <20261027065446.97098-1-kmehltretter@gmail.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) In-Reply-To: <20261015-b4-t210-pd_nvdec-nesting-v1-0-39a36b622eac@nvidia.com> References: <20261015-b4-t210-pd_nvdec-nesting-v1-0-39a36b622eac@nvidia.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On Thu, Oct 15, 2026 at 06:58:01PM +0900, Mikko Perttunen wrote: > On Tegra210, parts of the NVDEC hardware unit are in the NVJPG power > domain. According to the TRM, the NVJPG power domains must always be > ungated while the NVDEC power domain is ungated. Model the dependency in > device tree. > > The first PMC patch updates the PMC driver to handle cases where a PMC > power domain depends on another PMC power domain (other than the core > domain). The second device tree patch adds the dependency in the device > tree. Tested on Jetson Nano (Tegra210, 7000e400.pmc and 54480000.nvdec with nvidia/tegra210/nvdec.bin) on v7.3-rc2 (5b0764a53235): - Unpatched: pm_genpd_summary lists nvdec as a top-level domain while nvjpg stays off-0. Writing "on" to /sys/bus/platform/devices/54480000.nvdec/power/control immediately resets the board into TegraBoot. - With both patches applied: pm_genpd_summary registers nvdec as a child subdomain of nvjpg. Writing "on" to 54480000.nvdec/power/control powers on both nvjpg and nvdec, boots the Falcon firmware, and puts 54480000.nvdec into runtime_status=active. Writing "auto" powers both nvdec and nvjpg back to off-0. Tested-by: Karl Mehltretter Thanks, Karl