From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 903553D092F; Wed, 30 Sep 2026 18:52:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790794334; cv=none; b=ijJmc1XBb+rjo3xhwIjesHFVYUoA+UrsUixzpTCySQIA7ABCgDtUlkwzFpmASnCAa9fTzdZnSJg3J3pUcOrFg8QDvm2hlLWLqfYlDoh4i5ocZJXVzpRj87ZReoqgJ79jH+eJ3tu3Rsvx+n5SQG3OOpeXWl8JByliZR0PeRKWneQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790794334; c=relaxed/simple; bh=MzGzlM3MUVjZo0VsTk8AWr6bUfJO2cG95GF9NP0QDkU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=q6PrZeu9UiH5WPIjw7+ku8RP/eMcp07+yoJFME+1dexicYcaEEr2MwWvg5G3lDMWJXDbJ+N5XICtzR3xi1SZxZwhJfMsnq1AN6pw6+q4cnIwhy+D73o99Qnoz9OJ9urq51W32pawBrE+pw66LS77eb6i5LG8pDfGLo91+8GNa9A= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=clyBr9ac; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="clyBr9ac" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EE6A41F000FF; Wed, 30 Sep 2026 18:52:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790794333; bh=9BK8DR7d7/5vIRNBa5Sm26AVfKRYVJKnZBX2ZMqeyQs=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=clyBr9acZDnMaQ09VCuj315T82YjSVCAsrTLaZIiUCXPwab9raqksImbQjei70OV/ N3l+9pW/x4AYiNXqvMu+d4xQGCVq864Psb1anbRUwW6KrW5NmLDw80BMCIyGdsWROR Utx2lVVElH/u+wYubZQklmKwTQOTlxRFlvs4Sy2I= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Michael Walle , Kevin Hilman , Randolph Sapp , Nishanth Menon , Antonios Christidis , Brian Masney , Sasha Levin Subject: [PATCH 6.6 0174/1193] clk: keystone: dont cache clock rate Date: Wed, 30 Sep 2026 17:14:18 +0200 Message-ID: <20260930152438.060392190@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260930152434.301151190@linuxfoundation.org> References: <20260930152434.301151190@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Michael Walle [ Upstream commit a80b32a140c8612bbaed27009c383d43304db6d5 ] The TISCI firmware will return 0 if the clock or consumer is not enabled although there is a stored value in the firmware. IOW a call to set rate will work but at get rate will always return 0 if the clock is disabled. The clk framework will try to cache the clock rate when it's requested by a consumer. If the clock or consumer is not enabled at that point, the cached value is 0, which is wrong. Thus, disable the cache altogether. Signed-off-by: Michael Walle Reviewed-by: Kevin Hilman Reviewed-by: Randolph Sapp Reviewed-by: Nishanth Menon Signed-off-by: Antonios Christidis Reviewed-by: Brian Masney Link: https://patch.msgid.link/20260507-clk-sci-v2-1-38f59b48777a@ti.com Signed-off-by: Nishanth Menon Signed-off-by: Sasha Levin --- drivers/clk/keystone/sci-clk.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/clk/keystone/sci-clk.c b/drivers/clk/keystone/sci-clk.c index 35fe197dd303c..9dcfcacdd64d5 100644 --- a/drivers/clk/keystone/sci-clk.c +++ b/drivers/clk/keystone/sci-clk.c @@ -333,6 +333,14 @@ static int _sci_clk_build(struct sci_clk_provider *provider, init.ops = &sci_clk_ops; init.num_parents = sci_clk->num_parents; + + /* + * A clock rate query to the SCI firmware will return 0 if either the + * clock itself is disabled or the attached device/consumer is disabled. + * This makes it inherently unsuitable for the caching of the clk + * framework. + */ + init.flags = CLK_GET_RATE_NOCACHE; sci_clk->hw.init = &init; ret = devm_clk_hw_register(provider->dev, &sci_clk->hw); -- 2.53.0