From patchwork Tue Sep 22 08:02:55 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yakir Yang X-Patchwork-Id: 7236301 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 9582A9F32B for ; Tue, 22 Sep 2015 08:07:23 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 8AE93207EB for ; Tue, 22 Sep 2015 08:07:22 +0000 (UTC) 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.kernel.org (Postfix) with ESMTPS id 6B696207E2 for ; Tue, 22 Sep 2015 08:07:21 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZeIa0-0001hy-3n; Tue, 22 Sep 2015 08:05:36 +0000 Received: from lucky1.263xmail.com ([211.157.147.133]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZeIZu-0001MR-6A; Tue, 22 Sep 2015 08:05:33 +0000 Received: from ykk?rock-chips.com (unknown [192.168.167.232]) by lucky1.263xmail.com (Postfix) with SMTP id 0243E4BFBD; Tue, 22 Sep 2015 16:05:05 +0800 (CST) X-263anti-spam: KSV:0; X-MAIL-GRAY: 1 X-MAIL-DELIVERY: 0 X-KSVirus-check: 0 X-ABS-CHECKED: 4 X-ADDR-CHECKED: 0 Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.263.net (Postfix) with ESMTP id F32B6482; Tue, 22 Sep 2015 16:04:57 +0800 (CST) X-RL-SENDER: ykk@rock-chips.com X-FST-TO: inki.dae@samsung.com X-SENDER-IP: 58.22.7.114 X-LOGIN-NAME: ykk@rock-chips.com X-UNIQUE-TAG: <177d6f6928a90d2d93533782c489b199> X-ATTACHMENT-NUM: 0 X-SENDER: ykk@rock-chips.com X-DNS-TYPE: 0 Received: from localhost.localdomain (unknown [58.22.7.114]) by smtp.263.net (Postfix) whith ESMTP id 20275UM1KXK; Tue, 22 Sep 2015 16:05:02 +0800 (CST) From: Yakir Yang To: Inki Dae , Andrzej Hajda , Joonyoung Shim , Seung-Woo Kim , Kyungmin Park , Jingoo Han , Heiko Stuebner , Mark Yao , Thierry Reding , joe@perches.com, Krzysztof Kozlowski , Rob Herring Subject: [PATCH v5 15/17] drm: bridge: analogix/dp: try force hpd after plug in lookup failed Date: Tue, 22 Sep 2015 16:02:55 +0800 Message-Id: <1442908975-7401-1-git-send-email-ykk@rock-chips.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1442906428-2609-1-git-send-email-ykk@rock-chips.com> References: <1442906428-2609-1-git-send-email-ykk@rock-chips.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150922_010532_392302_4458992A X-CRM114-Status: GOOD ( 17.05 ) X-Spam-Score: -1.9 (-) 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: David Airlie , djkurtz@chromium.org, dianders@chromium.org, Yakir Yang , Gustavo Padovan , linux-samsung-soc@vger.kernel.org, Russell King , Kishon Vijay Abraham I , linux-rockchip@lists.infradead.org, Kukjin Kim , robherring2@gmail.com, devicetree@vger.kernel.org, Pawel Moll , Ian Campbell , Sean Paul , dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, emil.l.velikov@gmail.com, linux-kernel@vger.kernel.org, Kumar Gala , ajaynumb@gmail.com, Andy Yan MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Some edp screen do not have hpd signal, so we can't just return failed when hpd plug in detect failed. This is an hardware property, so we need add a devicetree property "analogix,need-force-hpd" to indicate this sutiation. Signed-off-by: Yakir Yang --- Changes in v5: None Changes in v4: None Changes in v3: - Add "analogix,need-force-hpd" to indicate whether driver need foce hpd when hpd detect failed. Changes in v2: None .../devicetree/bindings/drm/bridge/analogix_dp.txt | 4 ++- .../bindings/video/analogix_dp-rockchip.txt | 1 + .../devicetree/bindings/video/exynos_dp.txt | 1 + drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 36 +++++++++++++++++++--- drivers/gpu/drm/bridge/analogix/analogix_dp_core.h | 2 ++ drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c | 9 ++++++ 6 files changed, 47 insertions(+), 6 deletions(-) diff --git a/Documentation/devicetree/bindings/drm/bridge/analogix_dp.txt b/Documentation/devicetree/bindings/drm/bridge/analogix_dp.txt index f54dc3e..c310367 100644 --- a/Documentation/devicetree/bindings/drm/bridge/analogix_dp.txt +++ b/Documentation/devicetree/bindings/drm/bridge/analogix_dp.txt @@ -22,6 +22,9 @@ Required properties for dp-controller: from general PHY binding: Should be "dp". Optional properties for dp-controller: + -analogix,need-force-hpd: + Indicate driver need force hpd when hpd detect failed, this + is used for some eDP screen which don't have hpd signal. -hpd-gpios: Hotplug detect GPIO. Indicates which GPIO should be used for hotplug detection @@ -31,7 +34,6 @@ Optional properties for dp-controller: * Documentation/devicetree/bindings/video/exynos_dp.txt * Documentation/devicetree/bindings/video/analogix_dp-rockchip.txt - [1]: Documentation/devicetree/bindings/media/video-interfaces.txt ------------------------------------------------------------------------------- diff --git a/Documentation/devicetree/bindings/video/analogix_dp-rockchip.txt b/Documentation/devicetree/bindings/video/analogix_dp-rockchip.txt index ec93917..be18388 100644 --- a/Documentation/devicetree/bindings/video/analogix_dp-rockchip.txt +++ b/Documentation/devicetree/bindings/video/analogix_dp-rockchip.txt @@ -31,6 +31,7 @@ For the below properties, please refer to Analogix DP binding document: - phys (required) - phy-names (required) - hpd-gpios (optional) +- analogix,need-force-hpd (optional) ------------------------------------------------------------------------------- Example: diff --git a/Documentation/devicetree/bindings/video/exynos_dp.txt b/Documentation/devicetree/bindings/video/exynos_dp.txt index ea03b3a..4f06e80 100644 --- a/Documentation/devicetree/bindings/video/exynos_dp.txt +++ b/Documentation/devicetree/bindings/video/exynos_dp.txt @@ -41,6 +41,7 @@ For the below properties, please refer to Analogix DP binding document: -phys (required) -phy-names (required) -hpd-gpios (optional) + -analogix,need-force-hpd (optional) -video interfaces (optional) Deprecated properties for DisplayPort: diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c index 3efae33..7e83738 100644 --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c @@ -59,15 +59,38 @@ static int analogix_dp_detect_hpd(struct analogix_dp_device *dp) { int timeout_loop = 0; - while (analogix_dp_get_plug_in_status(dp) != 0) { + while (timeout_loop < DP_TIMEOUT_LOOP_COUNT) { + if (analogix_dp_get_plug_in_status(dp) == 0) + return 0; + timeout_loop++; - if (timeout_loop > DP_TIMEOUT_LOOP_COUNT) { - dev_err(dp->dev, "failed to get hpd plug status\n"); - return -ETIMEDOUT; - } usleep_range(10, 11); } + /* + * Some edp screen do not have hpd signal, so we can't just + * return failed when hpd plug in detect failed, DT property + * "need-force-hpd" would indicate whether driver need this. + */ + if (!dp->need_force_hpd) + return -ETIMEDOUT; + + /* + * The eDP TRM indicate that if HPD_STATUS(RO) is 0, AUX CH + * will not work, so we need to give a force hpd action to + * set HPD_STATUS manually. + */ + dev_dbg(dp->dev, "failed to get hpd plug status, try to force hpd\n"); + + analogix_dp_force_hpd(dp); + + if (analogix_dp_get_plug_in_status(dp) != 0) { + dev_err(dp->dev, "failed to get hpd plug in status\n"); + return -EINVAL; + } + + dev_dbg(dp->dev, "success to get plug in status after force hpd\n"); + return 0; } @@ -1243,6 +1266,9 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev, if (IS_ERR(dp->reg_base)) return PTR_ERR(dp->reg_base); + dp->need_force_hpd = + of_property_read_bool(dev->of_node, "analogix,need-force-hpd"); + dp->hpd_gpio = of_get_named_gpio(dev->of_node, "hpd-gpios", 0); if (!gpio_is_valid(dp->hpd_gpio)) dp->hpd_gpio = of_get_named_gpio(dev->of_node, diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h index f4cb799..3a136b8 100644 --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h @@ -160,6 +160,7 @@ struct analogix_dp_device { struct phy *phy; int dpms_mode; int hpd_gpio; + bool need_force_hpd; struct analogix_dp_plat_data *plat_data; }; @@ -180,6 +181,7 @@ void analogix_dp_set_analog_power_down(struct analogix_dp_device *dp, bool enable); void analogix_dp_init_analog_func(struct analogix_dp_device *dp); void analogix_dp_init_hpd(struct analogix_dp_device *dp); +void analogix_dp_force_hpd(struct analogix_dp_device *dp); enum dp_irq_type analogix_dp_get_irq_type(struct analogix_dp_device *dp); void analogix_dp_clear_hotplug_interrupts(struct analogix_dp_device *dp); void analogix_dp_reset_aux(struct analogix_dp_device *dp); diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c index 21a3287..c7e2959 100644 --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c @@ -365,6 +365,15 @@ void analogix_dp_init_hpd(struct analogix_dp_device *dp) writel(reg, dp->reg_base + ANALOGIX_DP_SYS_CTL_3); } +void analogix_dp_force_hpd(struct analogix_dp_device *dp) +{ + u32 reg; + + reg = readl(dp->reg_base + ANALOGIX_DP_SYS_CTL_3); + reg = (F_HPD | HPD_CTRL); + writel(reg, dp->reg_base + ANALOGIX_DP_SYS_CTL_3); +} + enum dp_irq_type analogix_dp_get_irq_type(struct analogix_dp_device *dp) { u32 reg;