From patchwork Mon Aug 22 03:36:24 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: huang lin X-Patchwork-Id: 9292891 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 3DDD8607D0 for ; Mon, 22 Aug 2016 03:40:20 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2AECA2893A for ; Mon, 22 Aug 2016 03:40:20 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1EB3D2893C; Mon, 22 Aug 2016 03:40:20 +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=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 70ED62893A for ; Mon, 22 Aug 2016 03:40:19 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bbg4U-0002sl-5M; Mon, 22 Aug 2016 03:38:46 +0000 Received: from mail-pa0-f65.google.com ([209.85.220.65]) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1bbg2p-00026U-FD; Mon, 22 Aug 2016 03:37:09 +0000 Received: by mail-pa0-f65.google.com with SMTP id vy10so7237504pac.0; Sun, 21 Aug 2016 20:36:46 -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=jCD2OnRf6PrRoccTJvzwR9JBFegMJeGwS+4UXThUtNs=; b=DyFob6NUhh6++tvbgSGGd4NuOcF4efhhiHW1o/ISJUCiy7F7vly8XFoC+q+ifwnGTw JzuEuCCUTgja0IVbKnvvNIoG1c5n/Fkq3hWlQ7t7YJbwHcimJk2t9KBXdkFSDjHJl3xr GmxuBX0GhWYS2f3emN2tTqXGF/+vYBMZqlvr//6tA3XJvkU1Q5ykESAoND6ynzJb4qtR cAD8ZhX/9fMCpQ7WiI+c7nbMJuEAuLA45bm5FaTORyUWhQ5JTEBIoGV/qHl5NUk0fVob dLoPgQKJZ1SkPQC8llZR5fBwNydxujFrm6+TTkO4X+mGtcx2J9WaVKt1GqgJrMf/ye6g H0lw== X-Gm-Message-State: AEkooutFm9kRBitYqoyQXOH6Jua9VAS4RNS5FYAyblf4+641SGcJuBIWxaXc/4y/8Yx4iw== X-Received: by 10.66.78.35 with SMTP id y3mr38097184paw.40.1471837006266; Sun, 21 Aug 2016 20:36:46 -0700 (PDT) Received: from hl-ThinkPad-X240.corp.google.com ([172.22.52.149]) by smtp.gmail.com with ESMTPSA id a20sm23063699pfa.27.2016.08.21.20.36.45 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Sun, 21 Aug 2016 20:36:45 -0700 (PDT) From: Lin Huang To: heiko@sntech.de, myungjoo.ham@samsung.com Subject: [PATCH v7 8/8] drm/rockchip: Add dmc notifier in vop driver Date: Mon, 22 Aug 2016 11:36:24 +0800 Message-Id: <1471836984-6316-9-git-send-email-hl@rock-chips.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1471836984-6316-1-git-send-email-hl@rock-chips.com> References: <1471836984-6316-1-git-send-email-hl@rock-chips.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160821_203703_662317_A6C8D35B X-CRM114-Status: GOOD ( 19.69 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: tixy@linaro.org, mark.rutland@arm.com, dbasehore@chromium.org, Lin Huang , cw00.choi@samsung.com, airlied@linux.ie, mturquette@baylibre.com, typ@rock-chips.com, sboyd@codeaurora.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, dianders@chromium.org, linux-rockchip@lists.infradead.org, kyungmin.park@samsung.com, sudeep.holla@arm.com, linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, mark.yao@rock-chips.com MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org 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 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 | 127 ++++++++++++++++++++++++++-- 1 file changed, 122 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c index ec8ad00..a76e70c 100644 --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c @@ -12,6 +12,8 @@ * GNU General Public License for more details. */ +#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; @@ -428,21 +437,59 @@ 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 void vop_enable(struct drm_crtc *crtc) { struct vop *vop = to_vop(crtc); + int num_enabled_crtc = 0; int ret; + if (vop->is_enabled) + return; + + /* + * if in dmc scaling frequency process, wait until it finishes + * use 100ms 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); - return; + goto err; } ret = clk_enable(vop->hclk); if (ret < 0) { dev_err(vop->dev, "failed to enable hclk - %d\n", ret); - return; + goto err; } ret = clk_enable(vop->dclk); @@ -456,7 +503,6 @@ static void vop_enable(struct drm_crtc *crtc) dev_err(vop->dev, "failed to enable aclk - %d\n", ret); goto err_disable_dclk; } - /* * Slave iommu shares power, irq and clock with vop. It was associated * automatically with this master device via common driver code. @@ -485,6 +531,21 @@ static void 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 vop we 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; err_disable_aclk: @@ -493,16 +554,32 @@ err_disable_dclk: clk_disable(vop->dclk); err_disable_hclk: clk_disable(vop->hclk); +err: + vop->vop_switch_status = 0; + wake_up(&vop->wait_vop_switch_queue); + return; } 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 100ms 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. @@ -515,7 +592,6 @@ static void vop_crtc_disable(struct drm_crtc *crtc) VOP_WIN_SET(vop, win, enable, 0); spin_unlock(&vop->reg_lock); } - drm_crtc_vblank_off(crtc); /* @@ -546,7 +622,6 @@ static void vop_crtc_disable(struct drm_crtc *crtc) * vop standby complete, so iommu detach is safe. */ rockchip_drm_dma_detach_device(vop->drm_dev, vop->dev); - clk_disable(vop->dclk); clk_disable(vop->aclk); clk_disable(vop->hclk); @@ -559,6 +634,25 @@ static void vop_crtc_disable(struct drm_crtc *crtc) crtc->state->event = NULL; } + + vop->vop_switch_status = 0; + wake_up(&vop->wait_vop_switch_queue); + + /* check how many vop 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); + } } static void vop_plane_destroy(struct drm_plane *plane) @@ -1410,6 +1504,8 @@ 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; @@ -1471,6 +1567,27 @@ 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; }