From patchwork Mon Mar 28 15:10:54 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sascha Hauer X-Patchwork-Id: 12793802 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id AE85DC433EF for ; Mon, 28 Mar 2022 15:15:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=0ES0oU1zrgiUuNUi+u7AEtm7eW1owGFa3Jndf6OvERg=; b=GlqF/545m2RYyS YV9WfmJCHrO3FxOGygcEK1/41zfIiF9mrungTZetUiWd9J1RO4AvxyJUbA/hpDtdljEnZ4UC7/mWA kAs0KkMbt+75NuUMRmMpguQ/etRymSuB5HzGeIkBZS6wNW9+GD7Y8peNfjqqKvK7PQ7CjcR+XZGui cfNLi40MLsFkoGs6ZJKS2sJT+TmC0H4zi3F91STjLzgaCondZLdw2ULQlukHM+QBg8uzsY6YkIKYz 8H9o5Pkx+0aT6pUmbBoHnkSA42/N80i0VQKXU8488dHHbq3bZx4d/+lG7IraD8Kbt4k+WUz+mGaAE h8sWf6rSVjOgjxfhhrqw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nYr4B-009EyZ-OG; Mon, 28 Mar 2022 15:13:59 +0000 Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nYr1i-009DhJ-LR for linux-arm-kernel@lists.infradead.org; Mon, 28 Mar 2022 15:11:31 +0000 Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1nYr1g-00006M-4Z; Mon, 28 Mar 2022 17:11:24 +0200 Received: from [2a0a:edc0:0:1101:1d::28] (helo=dude02.red.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtp (Exim 4.94.2) (envelope-from ) id 1nYr1c-003cTm-Bo; Mon, 28 Mar 2022 17:11:23 +0200 Received: from sha by dude02.red.stw.pengutronix.de with local (Exim 4.94.2) (envelope-from ) id 1nYr1a-008XKx-7M; Mon, 28 Mar 2022 17:11:18 +0200 From: Sascha Hauer To: dri-devel@lists.freedesktop.org Cc: linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, devicetree@vger.kernel.org, kernel@pengutronix.de, Andy Yan , Benjamin Gaignard , Michael Riesch , Sandy Huang , =?utf-8?q?Heiko_St=C3=BCbner?= , Peter Geis , Sascha Hauer Subject: [PATCH v9 01/23] clk: rk3568: Mark hclk_vo as critical Date: Mon, 28 Mar 2022 17:10:54 +0200 Message-Id: <20220328151116.2034635-2-s.hauer@pengutronix.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220328151116.2034635-1-s.hauer@pengutronix.de> References: <20220328151116.2034635-1-s.hauer@pengutronix.de> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: sha@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-arm-kernel@lists.infradead.org X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220328_081126_821587_A7B0B396 X-CRM114-Status: GOOD ( 15.14 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Whenever pclk_vo is enabled hclk_vo must be enabled as well. This is described in the Reference Manual as: | 2.8.6 NIU Clock gating reliance | | A part of niu clocks have a dependence on another niu clock in order to | sharing the internal bus. When these clocks are in use, another niu | clock must be opened, and cannot be gated. These clocks and the special | clock on which they are relied are as following: | | Clocks which have dependency The clock which can not be gated | ----------------------------------------------------------------- | ... | pclk_vo_niu, hclk_vo_s_niu hclk_vo_niu | ... The clock framework doesn't offer a way to enable clock B whenever clock A is enabled, at least not when B is not an ancestor of A. Workaround this by marking hclk_vo as critical so it is never disabled. This is suboptimal in terms of power consumption, but a stop gap solution until the clock framework has a way to deal with this. We have this clock tree: | aclk_vo 2 2 0 300000000 0 0 50000 Y | aclk_hdcp 0 0 0 300000000 0 0 50000 N | pclk_vo 2 3 0 75000000 0 0 50000 Y | pclk_edp_ctrl 0 0 0 75000000 0 0 50000 N | pclk_dsitx_1 0 0 0 75000000 0 0 50000 N | pclk_dsitx_0 1 2 0 75000000 0 0 50000 Y | pclk_hdmi_host 1 2 0 75000000 0 0 50000 Y | pclk_hdcp 0 0 0 75000000 0 0 50000 N | hclk_vo 2 5 0 150000000 0 0 50000 Y | hclk_hdcp 0 0 0 150000000 0 0 50000 N | hclk_vop 0 2 0 150000000 0 0 50000 N Without this patch the edp, dsitx, hdmi and hdcp driver would enable their clocks which then enables pclk_vo, but hclk_vo stays disabled and register accesses just hang. hclk_vo is enabled by the VOP2 driver, so reproducibility of this issue depends on the probe order. Signed-off-by: Sascha Hauer Reviewed-by: Dmitry Osipenko Reviewed-by: Robin Murphy --- Notes: Changes since v8: - new patch drivers/clk/rockchip/clk-rk3568.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/clk/rockchip/clk-rk3568.c b/drivers/clk/rockchip/clk-rk3568.c index 63dfbeeeb06d9..62694d95173ab 100644 --- a/drivers/clk/rockchip/clk-rk3568.c +++ b/drivers/clk/rockchip/clk-rk3568.c @@ -1591,6 +1591,7 @@ static const char *const rk3568_cru_critical_clocks[] __initconst = { "hclk_php", "pclk_php", "hclk_usb", + "hclk_vo", }; static const char *const rk3568_pmucru_critical_clocks[] __initconst = {