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Wed, 28 Oct 2026 08:50:30 -0700 From: Johnny Liu To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Thierry Reding , Jonathan Hunter , "Prashant Gaikwad" , Stephen Boyd , Brian Masney , Jerome Brunet , "Douglas Anderson" , Aniruddha Rao , , , , CC: Johnny Liu Subject: [PATCH v2 4/4] clk: tegra: bpmp: Do not cache the EMC clock rate Date: Wed, 28 Oct 2026 15:50:00 +0000 Message-ID: <20261028155000.1205739-5-johnliu@nvidia.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261028155000.1205739-1-johnliu@nvidia.com> References: <20261028155000.1205739-1-johnliu@nvidia.com> X-Mailing-List: linux-tegra@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 X-NVConfidentiality: public Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: rnnvmail202.nvidia.com (10.129.68.7) To rnnvmail201.nvidia.com (10.129.68.8) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH01EPF000BE940:EE_|SA1PR12MB6799:EE_ X-MS-Office365-Filtering-Correlation-Id: 7ae82725-62b9-4c1a-d411-08df350d5ae8 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|7416014|376014|1800799024|36860700016|82310400026|921020|11063799006|56012099006|261021121427099003|261009223027099003|10067099003|18002099003|22082099003; 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When the rate changes on the BPMP side, clk_get_rate() on the kernel side returns the stale value cached by the common clock framework instead of the rate programmed by the BPMP. Set CLK_GET_RATE_NOCACHE on the EMC clock, identified by the per-SoC emc_clk_id from the BPMP SoC data, so that rate queries are forwarded to the BPMP. Signed-off-by: Johnny Liu --- drivers/clk/tegra/clk-bpmp.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/clk/tegra/clk-bpmp.c b/drivers/clk/tegra/clk-bpmp.c index 067a8555c4e7..ddbc528cf93a 100644 --- a/drivers/clk/tegra/clk-bpmp.c +++ b/drivers/clk/tegra/clk-bpmp.c @@ -588,6 +588,9 @@ tegra_bpmp_clk_register(struct tegra_bpmp *bpmp, init.parent_names = parents; + if (bpmp->soc->emc_clk_id && info->id == bpmp->soc->emc_clk_id) + init.flags = CLK_GET_RATE_NOCACHE; + err = devm_clk_hw_register(bpmp->dev, &clk->hw); kfree(parents); -- 2.43.0