From patchwork Wed Dec 20 18:20:43 2017 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: 10126291 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 392086019C for ; Wed, 20 Dec 2017 18:21:19 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2DFBF2988F for ; Wed, 20 Dec 2017 18:21:19 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 20B832988E; Wed, 20 Dec 2017 18:21:19 +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, UNPARSEABLE_RELAY 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 7C9B12988B for ; Wed, 20 Dec 2017 18:21:18 +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:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id: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=NETxUBhcC/NkuXoPVBwwqMTOLvWdCsM1FQvZZuAHYqI=; b=dvcnqOItFYidlH2HZa7m/VZTPi 89iT/P2ZM7NuwXC+zez/ZhoBQy9H0g6DQccGHj/FwoeRM4YOWJzoo7oEUFTtZgfwH2K/V0bWgDVQ2 /gKn0rWLuc5WyarAnyoUFMHTck4sYv/XJmmNmxrZIyULke2MyoVNpe7Fh2CvSB0UEjdBgecOCWENL saB8JTZ/dG3M/MpxtoyYq9NK2JjP/aFxehj6Fj8FXmO0jX+dHq+nuQJV4p9a64yDYR0jFeNZvBI9J IcOKBnVHqzio9l59g8i+EpteLRgj4YyVaVzjuZfS9jurJA+cLuudK25VxbF3N8mx9UL+CugqtbCrt kCffue5Q==; 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 1eRizT-00017M-Tx; Wed, 20 Dec 2017 18:21:15 +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 1eRizN-00013a-Uc; Wed, 20 Dec 2017 18:21:13 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: eballetbo) with ESMTPSA id 8251C270B99 From: Enric Balletbo i Serra To: Mark Yao , David Airlie , Heiko Stuebner , Sean Paul Subject: [PATCH 1/2] drm/rockchip: Don't use atomic constructs for psr Date: Wed, 20 Dec 2017 19:20:43 +0100 Message-Id: <20171220182044.20331-2-enric.balletbo@collabora.com> X-Mailer: git-send-email 2.9.3 In-Reply-To: <20171220182044.20331-1-enric.balletbo@collabora.com> References: <20171220182044.20331-1-enric.balletbo@collabora.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20171220_102110_396281_58603453 X-CRM114-Status: GOOD ( 11.76 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: wzz@rock-chips.com, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-rockchip@lists.infradead.org, marcheu@chromium.org, linux-arm-kernel@lists.infradead.org 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 From: Sean Paul Instead of using timer and spinlocks, use delayed_work and mutexes for rockchip psr. This allows us to make blocking calls when enabling/disabling psr (which is sort of important given we're talking over dpcd to the display). Signed-off-by: Sean Paul Signed-off-by: Enric Balletbo i Serra --- drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 2 +- drivers/gpu/drm/rockchip/rockchip_drm_drv.h | 2 +- drivers/gpu/drm/rockchip/rockchip_drm_psr.c | 63 +++++++++++++---------------- 3 files changed, 29 insertions(+), 38 deletions(-) diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c index 76d63de..cd7ae12 100644 --- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c +++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c @@ -134,7 +134,7 @@ static int rockchip_drm_bind(struct device *dev) drm_dev->dev_private = private; INIT_LIST_HEAD(&private->psr_list); - spin_lock_init(&private->psr_list_lock); + mutex_init(&private->psr_list_lock); ret = rockchip_drm_init_iommu(drm_dev); if (ret) diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.h b/drivers/gpu/drm/rockchip/rockchip_drm_drv.h index 498dfbc..9c064a4 100644 --- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.h +++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.h @@ -55,7 +55,7 @@ struct rockchip_drm_private { struct mutex mm_lock; struct drm_mm mm; struct list_head psr_list; - spinlock_t psr_list_lock; + struct mutex psr_list_lock; }; int rockchip_drm_dma_attach_device(struct drm_device *drm_dev, diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_psr.c b/drivers/gpu/drm/rockchip/rockchip_drm_psr.c index 3acfd57..a3f6ec0 100644 --- a/drivers/gpu/drm/rockchip/rockchip_drm_psr.c +++ b/drivers/gpu/drm/rockchip/rockchip_drm_psr.c @@ -18,7 +18,7 @@ #include "rockchip_drm_drv.h" #include "rockchip_drm_psr.h" -#define PSR_FLUSH_TIMEOUT msecs_to_jiffies(100) +#define PSR_FLUSH_TIMEOUT_MS 100 enum psr_state { PSR_FLUSH, @@ -30,11 +30,11 @@ struct psr_drv { struct list_head list; struct drm_encoder *encoder; - spinlock_t lock; + struct mutex lock; bool active; enum psr_state state; - struct timer_list flush_timer; + struct delayed_work flush_work; void (*set)(struct drm_encoder *encoder, bool enable); }; @@ -43,9 +43,8 @@ static struct psr_drv *find_psr_by_crtc(struct drm_crtc *crtc) { struct rockchip_drm_private *drm_drv = crtc->dev->dev_private; struct psr_drv *psr; - unsigned long flags; - spin_lock_irqsave(&drm_drv->psr_list_lock, flags); + mutex_lock(&drm_drv->psr_list_lock); list_for_each_entry(psr, &drm_drv->psr_list, list) { if (psr->encoder->crtc == crtc) goto out; @@ -53,7 +52,7 @@ static struct psr_drv *find_psr_by_crtc(struct drm_crtc *crtc) psr = ERR_PTR(-ENODEV); out: - spin_unlock_irqrestore(&drm_drv->psr_list_lock, flags); + mutex_unlock(&drm_drv->psr_list_lock); return psr; } @@ -94,23 +93,21 @@ static void psr_set_state_locked(struct psr_drv *psr, enum psr_state state) static void psr_set_state(struct psr_drv *psr, enum psr_state state) { - unsigned long flags; - - spin_lock_irqsave(&psr->lock, flags); + mutex_lock(&psr->lock); psr_set_state_locked(psr, state); - spin_unlock_irqrestore(&psr->lock, flags); + mutex_unlock(&psr->lock); } -static void psr_flush_handler(struct timer_list *t) +static void psr_flush_handler(struct work_struct *work) { - struct psr_drv *psr = from_timer(psr, t, flush_timer); - unsigned long flags; + struct psr_drv *psr = container_of(to_delayed_work(work), + struct psr_drv, flush_work); /* If the state has changed since we initiated the flush, do nothing */ - spin_lock_irqsave(&psr->lock, flags); + mutex_lock(&psr->lock); if (psr->state == PSR_FLUSH) psr_set_state_locked(psr, PSR_ENABLE); - spin_unlock_irqrestore(&psr->lock, flags); + mutex_unlock(&psr->lock); } /** @@ -123,14 +120,13 @@ static void psr_flush_handler(struct timer_list *t) int rockchip_drm_psr_activate(struct drm_crtc *crtc) { struct psr_drv *psr = find_psr_by_crtc(crtc); - unsigned long flags; if (IS_ERR(psr)) return PTR_ERR(psr); - spin_lock_irqsave(&psr->lock, flags); + mutex_lock(&psr->lock); psr->active = true; - spin_unlock_irqrestore(&psr->lock, flags); + mutex_unlock(&psr->lock); return 0; } @@ -146,15 +142,14 @@ EXPORT_SYMBOL(rockchip_drm_psr_activate); int rockchip_drm_psr_deactivate(struct drm_crtc *crtc) { struct psr_drv *psr = find_psr_by_crtc(crtc); - unsigned long flags; if (IS_ERR(psr)) return PTR_ERR(psr); - spin_lock_irqsave(&psr->lock, flags); + mutex_lock(&psr->lock); psr->active = false; - spin_unlock_irqrestore(&psr->lock, flags); - del_timer_sync(&psr->flush_timer); + mutex_unlock(&psr->lock); + cancel_delayed_work_sync(&psr->flush_work); return 0; } @@ -162,8 +157,7 @@ EXPORT_SYMBOL(rockchip_drm_psr_deactivate); static void rockchip_drm_do_flush(struct psr_drv *psr) { - mod_timer(&psr->flush_timer, - round_jiffies_up(jiffies + PSR_FLUSH_TIMEOUT)); + schedule_delayed_work(&psr->flush_work, PSR_FLUSH_TIMEOUT_MS); psr_set_state(psr, PSR_FLUSH); } @@ -201,12 +195,11 @@ void rockchip_drm_psr_flush_all(struct drm_device *dev) { struct rockchip_drm_private *drm_drv = dev->dev_private; struct psr_drv *psr; - unsigned long flags; - spin_lock_irqsave(&drm_drv->psr_list_lock, flags); + mutex_lock(&drm_drv->psr_list_lock); list_for_each_entry(psr, &drm_drv->psr_list, list) rockchip_drm_do_flush(psr); - spin_unlock_irqrestore(&drm_drv->psr_list_lock, flags); + mutex_unlock(&drm_drv->psr_list_lock); } EXPORT_SYMBOL(rockchip_drm_psr_flush_all); @@ -223,7 +216,6 @@ int rockchip_drm_psr_register(struct drm_encoder *encoder, { struct rockchip_drm_private *drm_drv = encoder->dev->dev_private; struct psr_drv *psr; - unsigned long flags; if (!encoder || !psr_set) return -EINVAL; @@ -232,17 +224,17 @@ int rockchip_drm_psr_register(struct drm_encoder *encoder, if (!psr) return -ENOMEM; - timer_setup(&psr->flush_timer, psr_flush_handler, 0); - spin_lock_init(&psr->lock); + INIT_DELAYED_WORK(&psr->flush_work, psr_flush_handler); + mutex_init(&psr->lock); psr->active = true; psr->state = PSR_DISABLE; psr->encoder = encoder; psr->set = psr_set; - spin_lock_irqsave(&drm_drv->psr_list_lock, flags); + mutex_lock(&drm_drv->psr_list_lock); list_add_tail(&psr->list, &drm_drv->psr_list); - spin_unlock_irqrestore(&drm_drv->psr_list_lock, flags); + mutex_unlock(&drm_drv->psr_list_lock); return 0; } @@ -260,16 +252,15 @@ void rockchip_drm_psr_unregister(struct drm_encoder *encoder) { struct rockchip_drm_private *drm_drv = encoder->dev->dev_private; struct psr_drv *psr, *n; - unsigned long flags; - spin_lock_irqsave(&drm_drv->psr_list_lock, flags); + mutex_lock(&drm_drv->psr_list_lock); list_for_each_entry_safe(psr, n, &drm_drv->psr_list, list) { if (psr->encoder == encoder) { - del_timer(&psr->flush_timer); + cancel_delayed_work_sync(&psr->flush_work); list_del(&psr->list); kfree(psr); } } - spin_unlock_irqrestore(&drm_drv->psr_list_lock, flags); + mutex_unlock(&drm_drv->psr_list_lock); } EXPORT_SYMBOL(rockchip_drm_psr_unregister);