From patchwork Mon Jul 30 08:11:21 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Enric Balletbo i Serra X-Patchwork-Id: 10550269 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5D8DF157D for ; Tue, 31 Jul 2018 07:23:38 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 426BD28B3E for ; Tue, 31 Jul 2018 07:23:38 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 361A02A0C7; Tue, 31 Jul 2018 07:23:38 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED,UNPARSEABLE_RELAY autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 9BC4728B3E for ; Tue, 31 Jul 2018 07:23:37 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 9D7DE6E1E0; Tue, 31 Jul 2018 07:23:33 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from bhuna.collabora.co.uk (bhuna.collabora.co.uk [IPv6:2a00:1098:0:82:1000:25:2eeb:e3e3]) by gabe.freedesktop.org (Postfix) with ESMTPS id 4F12689CA8 for ; Mon, 30 Jul 2018 08:11:47 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: eballetbo) with ESMTPSA id 0850327E23E From: Enric Balletbo i Serra To: MyungJoo Ham , Kyungmin Park , Chanwoo Choi , Rob Herring , Will Deacon , Heiko Stuebner , Michael Turquette , Stephen Boyd , Sandy Huang , David Airlie Subject: [PATCH 5/8] devfreq: rk3399_dmc / clk: rockchip: Disable DDR clk timeout on suspend. Date: Mon, 30 Jul 2018 10:11:21 +0200 Message-Id: <20180730081124.30698-6-enric.balletbo@collabora.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180730081124.30698-1-enric.balletbo@collabora.com> References: <20180730081124.30698-1-enric.balletbo@collabora.com> X-Mailman-Approved-At: Tue, 31 Jul 2018 07:23:22 +0000 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Lin Huang , linux-pm@vger.kernel.org, Derek Basehore , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-rockchip@lists.infradead.org, kernel@collabora.com, robin.murphy@arm.com, linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP From: Derek Basehore This disables the timeout for the DDR clk when the governor is suspended or stopped. This makes sure that the suspend frequency is set. It also makes sure that the userspace governor will be able to change the frequency without failing. Signed-off-by: Derek Basehore Signed-off-by: Enric Balletbo i Serra --- Changes in v1: None drivers/clk/rockchip/clk-ddr.c | 21 ++++++++++++++++++--- drivers/devfreq/rk3399_dmc.c | 20 +++++++++++++++----- drivers/devfreq/rk3399_dmc_priv.h | 1 + 3 files changed, 34 insertions(+), 8 deletions(-) diff --git a/drivers/clk/rockchip/clk-ddr.c b/drivers/clk/rockchip/clk-ddr.c index 707be1bd8910..de00590af167 100644 --- a/drivers/clk/rockchip/clk-ddr.c +++ b/drivers/clk/rockchip/clk-ddr.c @@ -32,6 +32,7 @@ struct rockchip_ddrclk { int div_shift; int div_width; int ddr_flag; + bool timeout_en; unsigned long cached_rate; struct work_struct set_rate_work; struct mutex lock; @@ -52,8 +53,9 @@ static void rockchip_ddrclk_set_rate_func(struct work_struct *work) mutex_lock(&ddrclk->lock); for (i = 0; i < DDRCLK_SET_RATE_MAX_RETRIES; i++) { - ret = raw_notifier_call_chain(&ddrclk->sync_chain, 0, &timeout); - if (ret == NOTIFY_BAD) + ret = raw_notifier_call_chain(&ddrclk->sync_chain, 0, + &timeout); + if (ddrclk->timeout_en && ret == NOTIFY_BAD) goto out; /* @@ -63,7 +65,8 @@ static void rockchip_ddrclk_set_rate_func(struct work_struct *work) * at the wrong time. */ local_irq_disable(); - if (ktime_after(ktime_add_ns(ktime_get(), DMC_MIN_VBLANK_NS), + if (ddrclk->timeout_en && + ktime_after(ktime_add_ns(ktime_get(), DMC_MIN_VBLANK_NS), timeout)) { local_irq_enable(); continue; @@ -79,6 +82,17 @@ static void rockchip_ddrclk_set_rate_func(struct work_struct *work) mutex_unlock(&ddrclk->lock); } +void rockchip_ddrclk_set_timeout_en(struct clk *clk, bool enable) +{ + struct clk_hw *hw = __clk_get_hw(clk); + struct rockchip_ddrclk *ddrclk = to_rockchip_ddrclk_hw(hw); + + mutex_lock(&ddrclk->lock); + ddrclk->timeout_en = enable; + mutex_unlock(&ddrclk->lock); +} +EXPORT_SYMBOL(rockchip_ddrclk_set_timeout_en); + int rockchip_ddrclk_register_sync_nb(struct clk *clk, struct notifier_block *nb) { struct clk_hw *hw = __clk_get_hw(clk); @@ -232,6 +246,7 @@ struct clk *rockchip_clk_register_ddrclk(const char *name, int flags, ddrclk->div_shift = div_shift; ddrclk->div_width = div_width; ddrclk->ddr_flag = ddr_flag; + ddrclk->timeout_en = true; mutex_init(&ddrclk->lock); INIT_WORK(&ddrclk->set_rate_work, rockchip_ddrclk_set_rate_func); RAW_INIT_NOTIFIER_HEAD(&ddrclk->sync_chain); diff --git a/drivers/devfreq/rk3399_dmc.c b/drivers/devfreq/rk3399_dmc.c index b4ac9ee605be..323c888b542a 100644 --- a/drivers/devfreq/rk3399_dmc.c +++ b/drivers/devfreq/rk3399_dmc.c @@ -312,14 +312,18 @@ int rockchip_dmcfreq_register_clk_sync_nb(struct devfreq *devfreq, * one notifier is not generally possible. Thus, if more than one sync * notifier is registered, disable dmcfreq. */ - if (dmcfreq->num_sync_nb == 1 && dmcfreq->disable_count <= 0) + if (dmcfreq->num_sync_nb == 1 && dmcfreq->disable_count <= 0) { + rockchip_ddrclk_set_timeout_en(dmcfreq->dmc_clk, false); devfreq_suspend_device(devfreq); + } ret = rockchip_ddrclk_register_sync_nb(dmcfreq->dmc_clk, nb); if (ret == 0) dmcfreq->num_sync_nb++; - else if (dmcfreq->num_sync_nb == 1 && dmcfreq->disable_count <= 0) + else if (dmcfreq->num_sync_nb == 1 && dmcfreq->disable_count <= 0) { + rockchip_ddrclk_set_timeout_en(dmcfreq->dmc_clk, true); devfreq_resume_device(devfreq); + } mutex_unlock(&dmcfreq->en_lock); return ret; @@ -336,8 +340,10 @@ int rockchip_dmcfreq_unregister_clk_sync_nb(struct devfreq *devfreq, ret = rockchip_ddrclk_unregister_sync_nb(dmcfreq->dmc_clk, nb); if (ret == 0) { dmcfreq->num_sync_nb--; - if (dmcfreq->num_sync_nb == 1 && dmcfreq->disable_count <= 0) + if (dmcfreq->num_sync_nb == 1 && dmcfreq->disable_count <= 0) { + rockchip_ddrclk_set_timeout_en(dmcfreq->dmc_clk, true); devfreq_resume_device(devfreq); + } } mutex_unlock(&dmcfreq->en_lock); @@ -352,8 +358,10 @@ int rockchip_dmcfreq_block(struct devfreq *devfreq) int ret = 0; mutex_lock(&dmcfreq->en_lock); - if (dmcfreq->num_sync_nb <= 1 && dmcfreq->disable_count <= 0) + if (dmcfreq->num_sync_nb <= 1 && dmcfreq->disable_count <= 0) { + rockchip_ddrclk_set_timeout_en(dmcfreq->dmc_clk, false); ret = devfreq_suspend_device(devfreq); + } if (!ret) dmcfreq->disable_count++; @@ -369,8 +377,10 @@ int rockchip_dmcfreq_unblock(struct devfreq *devfreq) int ret = 0; mutex_lock(&dmcfreq->en_lock); - if (dmcfreq->num_sync_nb <= 1 && dmcfreq->disable_count == 1) + if (dmcfreq->num_sync_nb <= 1 && dmcfreq->disable_count == 1) { + rockchip_ddrclk_set_timeout_en(dmcfreq->dmc_clk, true); ret = devfreq_resume_device(devfreq); + } if (!ret) dmcfreq->disable_count--; diff --git a/drivers/devfreq/rk3399_dmc_priv.h b/drivers/devfreq/rk3399_dmc_priv.h index 8ac0340a4990..1ad46f4b15cc 100644 --- a/drivers/devfreq/rk3399_dmc_priv.h +++ b/drivers/devfreq/rk3399_dmc_priv.h @@ -7,6 +7,7 @@ #ifndef __RK3399_DMC_PRIV_H #define __RK3399_DMC_PRIV_H +void rockchip_ddrclk_set_timeout_en(struct clk *clk, bool enable); void rockchip_ddrclk_wait_set_rate(struct clk *clk); int rockchip_ddrclk_register_sync_nb(struct clk *clk, struct notifier_block *nb);