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Tue, 31 Mar 2026 11:03:03 -0700 (PDT) From: Daniel Bozeman To: ulf.hansson@linaro.org, heiko@sntech.de Cc: linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org, Daniel Bozeman Subject: [PATCH 2/2] pmdomain/rockchip: skip domains returning -EPROBE_DEFER Date: Tue, 31 Mar 2026 18:02:23 +0000 Message-ID: <20260331180223.1682283-2-daniel@orb.net> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260331180223.1682283-1-daniel@orb.net> References: <20260331180223.1682283-1-daniel@orb.net> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit When iterating child nodes during probe, a single domain returning -EPROBE_DEFER (e.g. due to clock dependencies not yet available) causes the entire power domain controller to fail and tear down all successfully registered domains. This creates a window where devices in unrelated power domains that would have registered successfully cannot access their hardware. On RK3528, PD_GPU requires CRU clocks that may not be available yet, but the idle-only domains (PD_RKVENC, PD_VO, PD_VPU) have no clock requirements. When the controller fails due to PD_GPU, GPIO controllers in PD_RKVENC become inaccessible, leading to synchronous external aborts when GPIO-controlled regulators probe. Skip domains that return -EPROBE_DEFER and continue registering the rest. Skipped domains have NULL entries in the provider, causing their consumers to receive -ENOENT and defer until available. Fixes: 7c696693a4f5 ("soc: rockchip: power-domain: Add power domain driver") Signed-off-by: Daniel Bozeman --- drivers/pmdomain/rockchip/pm-domains.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/pmdomain/rockchip/pm-domains.c b/drivers/pmdomain/rockchip/pm-domains.c index 2eecae092a..f42880c94f 100644 --- a/drivers/pmdomain/rockchip/pm-domains.c +++ b/drivers/pmdomain/rockchip/pm-domains.c @@ -1077,6 +1077,11 @@ static int rockchip_pm_domain_probe(struct platform_device *pdev) for_each_available_child_of_node_scoped(np, node) { error = rockchip_pm_add_one_domain(pmu, node); if (error) { + if (error == -EPROBE_DEFER) { + dev_dbg(dev, "skipped node %pOFn, dependencies not yet available\n", + node); + continue; + } dev_err(dev, "failed to handle node %pOFn: %d\n", node, error); goto err_out; -- 2.43.0