From patchwork Fri Sep 2 21:08:45 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: huang lin X-Patchwork-Id: 9313099 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id AB04760760 for ; Mon, 5 Sep 2016 06:04:34 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9804E289B1 for ; Mon, 5 Sep 2016 06:04:34 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8CDA4289B3; Mon, 5 Sep 2016 06:04:34 +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=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED 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 4B935289B1 for ; Mon, 5 Sep 2016 06:04:33 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 7E3A96E359; Mon, 5 Sep 2016 06:04:05 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mail-pf0-f194.google.com (mail-pf0-f194.google.com [209.85.192.194]) by gabe.freedesktop.org (Postfix) with ESMTPS id E21466E248 for ; Fri, 2 Sep 2016 21:08:54 +0000 (UTC) Received: by mail-pf0-f194.google.com with SMTP id a143so2928226pfa.3 for ; Fri, 02 Sep 2016 14:08:54 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=ssm2XLcMvuypjmk+z+GtYSQQ5HYJwZ/P1ztomZn5SWA=; b=cC8pOLeSgRxFkwLx1LQ2P2foJw7/3Be9fOopWNbZsWQ6YX/1ReLtb5hMwENcE7i8nE ffyKRUeyxZhtOIN1TxtGCFplOlP+CAr9ON/D5TbrRQoP+NNjYgdqXpI8z1vDhL8coM8y men0kY64Xx8y0V2JI2E+VlhXtzQ6q2vD/cjdK3uy/sm8wh+IjJcJ41GP8n4y5cEMjSqT rmFzLzRMhubs3W3MLPIvom3KK32Rs5nrbJtP7gv16lvRi7Eu1Xl0l994EYWJWTpwub4x fa+FQtVVw08JplJUNyQ6kq5wSZW2UzvDAxXp8D1gK6MJ+FX6N9xpV0OFjLpw+OaAdI7j /d7g== X-Gm-Message-State: AE9vXwOq8u7MdNseF5RCQT2krkBOjOxTe4eTkQFjNxbaOgnB7b+s59Jf8zQZ8/X8YaX6Zw== X-Received: by 10.98.29.201 with SMTP id d192mr40114108pfd.142.1472850534546; Fri, 02 Sep 2016 14:08:54 -0700 (PDT) Received: from hl-ThinkPad-X240.corp.google.com ([172.22.52.196]) by smtp.gmail.com with ESMTPSA id n69sm16832997pfa.77.2016.09.02.14.08.53 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 02 Sep 2016 14:08:54 -0700 (PDT) From: Lin Huang To: heiko@sntech.de Subject: [PATCH v9 5/5] drm/rockchip: Add dmc notifier in vop driver Date: Sat, 3 Sep 2016 05:08:45 +0800 Message-Id: <1472850525-25273-6-git-send-email-hl@rock-chips.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1472850525-25273-1-git-send-email-hl@rock-chips.com> References: <1472850525-25273-1-git-send-email-hl@rock-chips.com> X-Mailman-Approved-At: Mon, 05 Sep 2016 06:04:02 +0000 Cc: tixy@linaro.org, mark.rutland@arm.com, devicetree@vger.kernel.org, typ@rock-chips.com, Lin Huang , linux-rockchip@lists.infradead.org, mturquette@baylibre.com, dbasehore@chromium.org, sboyd@codeaurora.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, dianders@chromium.org, cw00.choi@samsung.com, kyungmin.park@samsung.com, myungjoo.ham@samsung.com, sudeep.holla@arm.com, linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP when in ddr frequency scaling process, vop can not do enable or disable operation, since in dcf we check vop clock to see whether vop work. If vop work, dcf do ddr frequency scaling when vop in vblank status, and we need to read vop register to check whether vop go into vblank status. If vop not work, dcf can do ddr frequency any time. So when do ddr frequency scaling, you disabled or enable vop, there may two bad thing happen: 1, the panel flicker(when vop from disable status change to enable). 2, kernel hang (when vop from enable status change to disable, dcf need to read vblank status, but if you disable vop clock, it can not get the status, it will lead soc dead) So we need register to devfreq notifier, and we can get the dmc status. Also, when there have two vop enabled, we need to disable dmc, since dcf only base on one vop vblank time, so the other panel will flicker when do ddr frequency scaling. Signed-off-by: Lin Huang Reviewed-by: Chanwoo Choi --- Changes in v9: - None Changes in v8: - None Changes in v7: - None Changes in v6: - fix a build error Changes in v5: - improve some nits Changes in v4: - register notifier to devfreq_register_notifier - use DEVFREQ_PRECHANGE and DEVFREQ_POSTCHANGE to get dmc status - when two vop enable, disable dmc - when two vop back to one vop, enable dmc Changes in v3: - when do vop eanble/disable, dmc will wait until it finish Changes in v2: - None Changes in v1: - use wait_event instead usleep drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 116 ++++++++++++++++++++++++++++ 1 file changed, 116 insertions(+) diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c index efbc41a..a73f3aa 100644 --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c @@ -19,6 +19,8 @@ #include #include +#include +#include #include #include #include @@ -118,6 +120,13 @@ struct vop { const struct vop_data *data; + struct devfreq *devfreq; + struct devfreq_event_dev *devfreq_event_dev; + struct notifier_block dmc_nb; + int dmc_in_process; + int vop_switch_status; + wait_queue_head_t wait_dmc_queue; + wait_queue_head_t wait_vop_switch_queue; uint32_t *regsbak; void __iomem *regs; @@ -428,11 +437,47 @@ static void vop_dsp_hold_valid_irq_disable(struct vop *vop) spin_unlock_irqrestore(&vop->irq_lock, flags); } +static int dmc_notify(struct notifier_block *nb, unsigned long event, + void *data) +{ + struct vop *vop = container_of(nb, struct vop, dmc_nb); + + if (event == DEVFREQ_PRECHANGE) { + /* + * check if vop in enable or disable process, + * if yes, wait until it finishes, use 200ms as + * timeout. + */ + if (!wait_event_timeout(vop->wait_vop_switch_queue, + !vop->vop_switch_status, HZ / 5)) + dev_warn(vop->dev, + "Timeout waiting for vop swtich status\n"); + vop->dmc_in_process = 1; + } else if (event == DEVFREQ_POSTCHANGE) { + vop->dmc_in_process = 0; + wake_up(&vop->wait_dmc_queue); + } + + return NOTIFY_OK; +} + static int vop_enable(struct drm_crtc *crtc) { struct vop *vop = to_vop(crtc); + int num_enabled_crtc = 0; int ret; + /* + * if in dmc scaling frequency process, wait until it finishes + * use 200ms as timeout time. + */ + if (!wait_event_timeout(vop->wait_dmc_queue, + !vop->dmc_in_process, HZ / 5)) + dev_warn(vop->dev, + "Timeout waiting for dmc when vop enable\n"); + + vop->vop_switch_status = 1; + ret = pm_runtime_get_sync(vop->dev); if (ret < 0) { dev_err(vop->dev, "failed to get pm runtime: %d\n", ret); @@ -479,6 +524,21 @@ static int vop_enable(struct drm_crtc *crtc) drm_crtc_vblank_on(crtc); + vop->vop_switch_status = 0; + wake_up(&vop->wait_vop_switch_queue); + + /* check how many VOPs in use now */ + drm_for_each_crtc(crtc, vop->drm_dev) { + if (crtc->state->enable) + num_enabled_crtc++; + } + + /* if enable two vop, need to disable dmc */ + if ((num_enabled_crtc > 1) && vop->devfreq) { + if (vop->devfreq_event_dev) + devfreq_event_disable_edev(vop->devfreq_event_dev); + devfreq_suspend_device(vop->devfreq); + } return 0; err_disable_aclk: @@ -489,17 +549,31 @@ err_disable_hclk: clk_disable(vop->hclk); err_put_pm_runtime: pm_runtime_put_sync(vop->dev); + vop->vop_switch_status = 0; + wake_up(&vop->wait_vop_switch_queue); return ret; } static void vop_crtc_disable(struct drm_crtc *crtc) { struct vop *vop = to_vop(crtc); + int num_enabled_crtc = 0; int i; WARN_ON(vop->event); /* + * if in dmc scaling frequency process, wait until it finish + * use 200ms as timeout time. + */ + if (!wait_event_timeout(vop->wait_dmc_queue, + !vop->dmc_in_process, HZ / 5)) + dev_warn(vop->dev, + "Timeout waiting for dmc when vop disable\n"); + + vop->vop_switch_status = 1; + + /* * We need to make sure that all windows are disabled before we * disable that crtc. Otherwise we might try to scan from a destroyed * buffer later. @@ -555,6 +629,24 @@ static void vop_crtc_disable(struct drm_crtc *crtc) spin_unlock_irq(&crtc->dev->event_lock); crtc->state->event = NULL; + + vop->vop_switch_status = 0; + wake_up(&vop->wait_vop_switch_queue); + + /* check how many VOPs in use now */ + drm_for_each_crtc(crtc, vop->drm_dev) { + if (crtc->state->enable) + num_enabled_crtc++; + } + + /* + * if num_enabled_crtc = 1 now, it means 2 vop enabled + * change to 1 vop enabled need to enable dmc again. + */ + if ((num_enabled_crtc == 1) && vop->devfreq) { + if (vop->devfreq_event_dev) + devfreq_event_enable_edev(vop->devfreq_event_dev); + devfreq_resume_device(vop->devfreq); } } @@ -1413,6 +1505,8 @@ static int vop_bind(struct device *dev, struct device *master, void *data) struct drm_device *drm_dev = data; struct vop *vop; struct resource *res; + struct devfreq *devfreq; + struct devfreq_event_dev *event_dev; size_t alloc_size; int ret, irq; @@ -1474,6 +1568,28 @@ static int vop_bind(struct device *dev, struct device *master, void *data) return ret; pm_runtime_enable(&pdev->dev); + + init_waitqueue_head(&vop->wait_vop_switch_queue); + vop->vop_switch_status = 0; + init_waitqueue_head(&vop->wait_dmc_queue); + vop->dmc_in_process = 0; + + devfreq = devfreq_get_devfreq_by_phandle(dev, 0); + if (IS_ERR(devfreq)) + goto out; + + vop->devfreq = devfreq; + vop->dmc_nb.notifier_call = dmc_notify; + devfreq_register_notifier(vop->devfreq, &vop->dmc_nb, + DEVFREQ_TRANSITION_NOTIFIER); + + event_dev = devfreq_event_get_edev_by_phandle(vop->devfreq->dev.parent, + 0); + if (IS_ERR(event_dev)) + goto out; + + vop->devfreq_event_dev = event_dev; +out: return 0; }