From patchwork Mon Jan 15 17:15:44 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thierry Escande X-Patchwork-Id: 10164915 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 523B460325 for ; Mon, 15 Jan 2018 17:17:38 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 37378204C1 for ; Mon, 15 Jan 2018 17:17:38 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2C2C6204FD; Mon, 15 Jan 2018 17:17:38 +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=-4.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id B6C97204C1 for ; Mon, 15 Jan 2018 17:17:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=20y8VjEQw0CT8ysbSIXVxw6bzPoklErBDZdR4zDAeb8=; b=pZ2998HD9nUruh ueniZs7U9vLXZF4uhiozQuoLZCvIBJ/Jqe0y9vdUHUEKOakKRjgJPBEgcmY+xbQwLAhOFxr3N/UXi qbIB6iEkU+K2kDNpSUZ1pzBLJYAESQGEItXHCRhrwIS1HfWZdGR3tTTgCPRr/fpIMdCoa7GOC/ybM hVT7Q51JH/fUYok4DXeGpx864ApTIvmirrySzCAixewr29++ltghdmpb7PVrm6kdRnLaJrblhdTfM oLLNqEYroK4r+hSAnxOdgqmN59UICVff/ccpybQDDVa8hTkBI0hm3elwZENjLBzcfLHfsjmmnXaZK NDFcYf8hnDqMvyPJ127A==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.89 #1 (Red Hat Linux)) id 1eb8O8-0007Lr-N0; Mon, 15 Jan 2018 17:17:36 +0000 Received: from bhuna.collabora.co.uk ([2a00:1098:0:82:1000:25:2eeb:e3e3]) by bombadil.infradead.org with esmtps (Exim 4.89 #1 (Red Hat Linux)) id 1eb8Ns-0006ui-8l for linux-rockchip@lists.infradead.org; Mon, 15 Jan 2018 17:17:27 +0000 Received: from localhost.localdomain (unknown [IPv6:2a01:e35:8a7e:4790:5118:57f7:752d:6fb0]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: tescande) by bhuna.collabora.co.uk (Postfix) with ESMTPSA id 0E0C2270B4C; Mon, 15 Jan 2018 17:16:58 +0000 (GMT) From: Thierry Escande To: Archit Taneja , Inki Dae , Thierry Reding , Sandy Huang , Sean Paul , David Airlie Subject: [PATCH 10/40] drm/rockchip: add mutex vop lock Date: Mon, 15 Jan 2018 18:15:44 +0100 Message-Id: <20180115171614.14474-11-thierry.escande@collabora.com> X-Mailer: git-send-email 2.14.1 In-Reply-To: <20180115171614.14474-1-thierry.escande@collabora.com> References: <20180115171614.14474-1-thierry.escande@collabora.com> MIME-Version: 1.0 Content-Transfert-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180115_091720_756347_14A73D9A X-CRM114-Status: GOOD ( 12.10 ) X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: zain wang , Lin Huang , linux-kernel@vger.kernel.org, Douglas Anderson , dri-devel@lists.freedesktop.org, Tomasz Figa , linux-rockchip@lists.infradead.org, Yakir Yang , =?UTF-8?q?=C3=98rjan=20Eide?= , Mark Yao , Haixia Shi Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+patchwork-linux-rockchip=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP From: zain wang Add a lock to vop to avoid disabling the crtc while waiting for a line flag while enabling psr. If we disable in the middle of waiting for the line flag, we'll end up timing out or worse. Signed-off-by: zain wang Signed-off-by: Sean Paul Signed-off-by: Thierry Escande --- drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 30 +++++++++++++++++++++++------ 1 file changed, 24 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c index 31304434847a..bf4b1a2f3fa4 100644 --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c @@ -117,6 +117,8 @@ struct vop { spinlock_t reg_lock; /* lock vop irq reg */ spinlock_t irq_lock; + /* protects crtc enable/disable */ + struct mutex vop_lock; unsigned int irq; @@ -577,6 +579,7 @@ static void vop_crtc_atomic_disable(struct drm_crtc *crtc, WARN_ON(vop->event); + mutex_lock(&vop->vop_lock); drm_crtc_vblank_off(crtc); /* @@ -612,6 +615,7 @@ static void vop_crtc_atomic_disable(struct drm_crtc *crtc, clk_disable(vop->aclk); clk_disable(vop->hclk); pm_runtime_put(vop->dev); + mutex_unlock(&vop->vop_lock); if (crtc->state->event && !crtc->state->active) { spin_lock_irq(&crtc->dev->event_lock); @@ -882,10 +886,13 @@ static void vop_crtc_atomic_enable(struct drm_crtc *crtc, uint32_t pin_pol, val; int ret; + mutex_lock(&vop->vop_lock); + WARN_ON(vop->event); ret = vop_enable(crtc); if (ret) { + mutex_unlock(&vop->vop_lock); DRM_DEV_ERROR(vop->dev, "Failed to enable vop (%d)\n", ret); return; } @@ -949,6 +956,7 @@ static void vop_crtc_atomic_enable(struct drm_crtc *crtc, clk_set_rate(vop->dclk, adjusted_mode->clock * 1000); VOP_REG_SET(vop, common, standby, 0); + mutex_unlock(&vop->vop_lock); } static bool vop_fs_irq_is_pending(struct vop *vop) @@ -1487,15 +1495,21 @@ int rockchip_drm_wait_vact_end(struct drm_crtc *crtc, unsigned int mstimeout) { struct vop *vop = to_vop(crtc); unsigned long jiffies_left; + int ret = 0; if (!crtc || !vop->is_enabled) return -ENODEV; - if (mstimeout <= 0) - return -EINVAL; + mutex_lock(&vop->vop_lock); + if (mstimeout <= 0) { + ret = -EINVAL; + goto out; + } - if (vop_line_flag_irq_is_enabled(vop)) - return -EBUSY; + if (vop_line_flag_irq_is_enabled(vop)) { + ret = -EBUSY; + goto out; + } reinit_completion(&vop->line_flag_completion); vop_line_flag_irq_enable(vop); @@ -1506,10 +1520,13 @@ int rockchip_drm_wait_vact_end(struct drm_crtc *crtc, unsigned int mstimeout) if (jiffies_left == 0) { DRM_DEV_ERROR(vop->dev, "Timeout waiting for IRQ\n"); - return -ETIMEDOUT; + ret = -ETIMEDOUT; + goto out; } - return 0; +out: + mutex_unlock(&vop->vop_lock); + return ret; } EXPORT_SYMBOL(rockchip_drm_wait_vact_end); @@ -1559,6 +1576,7 @@ static int vop_bind(struct device *dev, struct device *master, void *data) spin_lock_init(&vop->reg_lock); spin_lock_init(&vop->irq_lock); + mutex_init(&vop->vop_lock); ret = devm_request_irq(dev, vop->irq, vop_isr, IRQF_SHARED, dev_name(dev), vop);