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 5885151FCA6; Wed, 30 Sep 2026 17:55:12 +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=1790790913; cv=none; b=mHPzgMYtZARQWYDy9XTu6C+h7TGQJDcZWZ2K8s9lIGyjq+KAGbR5EDaOEkhWqIuuEx8qsAWCWhzj+3uThNDwdD8iatUfgm9nNJCRLhKKRWVa1BzzSRdBnGEmRlM33oIF8oN+QINMBfG9Km98sTSFbCFY8RpdpcGQO+vfhIBk2/c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790790913; c=relaxed/simple; bh=DkqG719VXcIOXFZtMLvYgpqyW6OC36nNBBDSPrsCE+g=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ODuYujk3/n5QlIhRq74PRiXXaV39F26yPmQR6enFAO2kqxsUJdOpJcDSTHH2QaOsHr0UtEkE30duv864Q7gsmHwrUo0wNAOicO+R2s8SNm1xhvoj22ekpJzsBDYAo14QhQdkSlNDGT9knsITdksNt5EqGcZGZL1BXP3YjZe6Q7w= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=GG12C7zS; 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="GG12C7zS" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B8BCE1F000FF; Wed, 30 Sep 2026 17:55:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790790912; bh=rjjyeVBsNphZHQQQzGIVF27lO0zK+o1kD0b+turzfus=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=GG12C7zSdkQmJE2bblF4YIICuO9AL66iDlQepwGnccXG8Q75w2ZDDfVpcN4Fg3O3p rnCXCjm3OXxYNwqAeYXzgyqdT4A7FgqSavVeXLouB/+RaHI2S/9XpBFk5x1kweopFm uk/zx2LJN/tMahZacFr1bJw5la+z8VUH2oyykGns= 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 5.15 116/752] clk: keystone: dont cache clock rate Date: Wed, 30 Sep 2026 17:19:46 +0200 Message-ID: <20260930152400.687380976@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260930152358.131179731@linuxfoundation.org> References: <20260930152358.131179731@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 5.15-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 8af2a9faa805a..422482f60bbb8 100644 --- a/drivers/clk/keystone/sci-clk.c +++ b/drivers/clk/keystone/sci-clk.c @@ -342,6 +342,14 @@ 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