From patchwork Fri Jul 29 07:57:01 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: huang lin X-Patchwork-Id: 9252243 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 6043D601C0 for ; Fri, 29 Jul 2016 08:01:03 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5171927F88 for ; Fri, 29 Jul 2016 08:01:03 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4576027F9E; Fri, 29 Jul 2016 08:01:03 +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 A46C827F88 for ; Fri, 29 Jul 2016 08:01:02 +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 1bT2hf-0007zq-KF; Fri, 29 Jul 2016 07:59:31 +0000 Received: from mail-pa0-f66.google.com ([209.85.220.66]) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1bT2gA-0006oR-Oc; Fri, 29 Jul 2016 07:58:04 +0000 Received: by mail-pa0-f66.google.com with SMTP id cf3so4818998pad.2; Fri, 29 Jul 2016 00:57:41 -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=9TSvRIhfAJIq1zH2V4tm3RNp2sis1kpOG2Uz+sf1Rs8=; b=Bk0aVj7ugNQZ/gdqL/i4f7RS6eDXZHunG6qBtRM1gSQWzds8NYQSvxyw1pKnJPq0L5 pQA3gfHr8LGg17exNVr3eTfJYNulRmCE27r20cpt3gp+eln5CTmvcnfllPSwJ+uKlqSU /jcyCyJpFv/Uy8JFQLVS5uuP839ste8DnDcPWHmFJQhiElPGiifkfOV+o/iaFu8jDrHu n3IME7eGUXJW1h2RKOppJ1XLZNReIhwoPzkGEryj0fY4dtJnlRCOxFOPdXxTS44HBovL LsYqGq/NfmhwyeoYx1h8EFu1srr13tBkn66OiCGzL52tYPbWO/z/W0DipGVsqwzC6+wZ 7Fpg== X-Gm-Message-State: AEkooutXngZ7+9JlFMbpPDWBUVSt5/NjZVSTr23uDls1Me2Nyz3TuWpwvvPgfY7vZRgsPg== X-Received: by 10.66.249.201 with SMTP id yw9mr49667681pac.130.1469779061427; Fri, 29 Jul 2016 00:57:41 -0700 (PDT) Received: from localhost.localdomain ([103.29.142.67]) by smtp.gmail.com with ESMTPSA id g13sm22473077pfb.7.2016.07.29.00.57.37 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 29 Jul 2016 00:57:40 -0700 (PDT) From: Lin Huang To: heiko@sntech.de, cw00.choi@samsung.com Subject: [PATCH v4 7/7] drm/rockchip: Add dmc notifier in vop driver Date: Fri, 29 Jul 2016 15:57:01 +0800 Message-Id: <1469779021-10426-8-git-send-email-hl@rock-chips.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1469779021-10426-1-git-send-email-hl@rock-chips.com> References: <1469779021-10426-1-git-send-email-hl@rock-chips.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160729_005759_176836_59F7C4D6 X-CRM114-Status: GOOD ( 18.80 ) 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, typ@rock-chips.com, Lin Huang , airlied@linux.ie, mturquette@baylibre.com, dbasehore@chromium.org, 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, myungjoo.ham@samsung.com, 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 dcf will base on vop vblank time to do frequency scaling and need to get vop irq if there have vop enabled. So 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 --- 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 | 124 ++++++++++++++++++++++++++-- 1 file changed, 119 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c index c179933..3b251d1 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 @@ -127,6 +129,13 @@ 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; @@ -500,24 +509,60 @@ static void vop_line_flag_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 finish, 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); @@ -531,7 +576,6 @@ 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. @@ -560,6 +604,21 @@ 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: @@ -568,17 +627,33 @@ 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; if (!vop->is_enabled) return; /* + * 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. @@ -591,7 +666,6 @@ 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); /* @@ -622,7 +696,6 @@ 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); @@ -632,6 +705,25 @@ static void vop_crtc_disable(struct drm_crtc *crtc) vop->psr_enabled = false; schedule_delayed_work(&vop->psr_work, VOP_PSR_SET_DELAY_TIME); } + + 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) @@ -1583,6 +1675,8 @@ 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; @@ -1648,6 +1742,26 @@ static int vop_bind(struct device *dev, struct device *master, void *data) vop->psr_enabled = false; INIT_DELAYED_WORK(&vop->psr_work, vop_psr_work); + 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; }