From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B157DC6FA99 for ; Fri, 10 Mar 2023 14:20:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232098AbjCJOUc (ORCPT ); Fri, 10 Mar 2023 09:20:32 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60656 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232100AbjCJOUN (ORCPT ); Fri, 10 Mar 2023 09:20:13 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8EE105F6E1 for ; Fri, 10 Mar 2023 06:18:38 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id E1DDD61380 for ; Fri, 10 Mar 2023 14:18:37 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id F0551C433EF; Fri, 10 Mar 2023 14:18:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1678457917; bh=cdpHPIrBOnroxuNuHKOPyFdLgqB2mUZbUPFimmK80dw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=njM9Oy5dUaLFOyXGJzHuZehW9D2KOHYjpEGEuqmbhzf8pgu4Isj3XyBaoLZ+/DtFS ux+7d8MK0DMd7n9zxzNrtbIb8F4LJ9X0lZ6Hf/3XCuw9YJU2GJV9VnXyo08XIYUuxs krtuM9KCBsRAZ+qU3vvTk8rmc6TDZ0WMW3oixjeQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Chen-Yu Tsai , AngeloGioacchino Del Regno , Stephen Boyd , Sasha Levin Subject: [PATCH 4.19 103/252] clk: Honor CLK_OPS_PARENT_ENABLE in clk_core_is_enabled() Date: Fri, 10 Mar 2023 14:37:53 +0100 Message-Id: <20230310133721.929690458@linuxfoundation.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230310133718.803482157@linuxfoundation.org> References: <20230310133718.803482157@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Chen-Yu Tsai [ Upstream commit 79200d5851c8e7179f68a4a6f162d8f1bde4986f ] In the previous commits that added CLK_OPS_PARENT_ENABLE, support for this flag was only added to rate change operations (rate setting and reparent) and disabling unused subtree. It was not added to the clock gate related operations. Any hardware driver that needs it for these operations will either see bogus results, or worse, hang. This has been seen on MT8192 and MT8195, where the imp_ii2_* clk drivers set this, but dumping debugfs clk_summary would cause it to hang. Prepare parent on prepare and enable parent on enable dependencies are already handled automatically by the core as part of its sequencing. Whether the case for "enable parent on prepare" should be supported by this flag or not is not clear, and thus ignored for now. This change solely fixes the handling of clk_core_is_enabled, i.e. enabling the parent clock when reading the hardware state. Unfortunately clk_core_is_enabled is called in a variety of places, sometimes with the enable clock already held. To avoid deadlocking, the core will ignore readouts and just return false if CLK_OPS_PARENT_ENABLE is set but the parent isn't currently enabled. Fixes: fc8726a2c021 ("clk: core: support clocks which requires parents enable (part 2)") Fixes: a4b3518d146f ("clk: core: support clocks which requires parents enable (part 1)") Signed-off-by: Chen-Yu Tsai Link: https://lore.kernel.org/r/20230103092330.494102-1-wenst@chromium.org Tested-by: AngeloGioacchino Del Regno Reviewed-by: AngeloGioacchino Del Regno Signed-off-by: Stephen Boyd Signed-off-by: Sasha Levin --- drivers/clk/clk.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index 53ac3a0e741d7..a8d68ac9d0dea 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -244,6 +244,17 @@ static bool clk_core_is_enabled(struct clk_core *core) } } + /* + * This could be called with the enable lock held, or from atomic + * context. If the parent isn't enabled already, we can't do + * anything here. We can also assume this clock isn't enabled. + */ + if ((core->flags & CLK_OPS_PARENT_ENABLE) && core->parent) + if (!clk_core_is_enabled(core->parent)) { + ret = false; + goto done; + } + ret = core->ops->is_enabled(core->hw); done: if (core->dev) -- 2.39.2