From patchwork Wed Dec 9 06:17:34 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yakir Yang X-Patchwork-Id: 7804831 Return-Path: X-Original-To: patchwork-linux-samsung-soc@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id A1675BEEE1 for ; Wed, 9 Dec 2015 06:20:36 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 68953204D3 for ; Wed, 9 Dec 2015 06:20:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A5DE4204D6 for ; Wed, 9 Dec 2015 06:20:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751310AbbLIGU2 (ORCPT ); Wed, 9 Dec 2015 01:20:28 -0500 Received: from lucky1.263xmail.com ([211.157.147.130]:38229 "EHLO lucky1.263xmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752135AbbLIGTs (ORCPT ); Wed, 9 Dec 2015 01:19:48 -0500 Received: from ykk?rock-chips.com (unknown [192.168.167.97]) by lucky1.263xmail.com (Postfix) with SMTP id B87701E85D3; Wed, 9 Dec 2015 14:19:38 +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 684D82639A; Wed, 9 Dec 2015 14:19:33 +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: 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 14865LA9RZO; Wed, 09 Dec 2015 14:19:36 +0800 (CST) From: Yakir Yang To: Inki Dae , Mark Yao , Jingoo Han , Heiko Stuebner Cc: Thierry Reding , Krzysztof Kozlowski , Rob Herring , Andrzej Hajda , Joonyoung Shim , Seung-Woo Kim , Kyungmin Park , Russell King , emil.l.velikov@gmail.com, Gustavo Padovan , Kishon Vijay Abraham I , ajaynumb@gmail.com, javier@osg.samsung.com, Andy Yan , Yakir Yang , dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v10.2 14/17] drm: bridge: analogix/dp: try force hpd after plug in lookup failed Date: Wed, 9 Dec 2015 14:17:34 +0800 Message-Id: <1449641854-7201-1-git-send-email-ykk@rock-chips.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1449470239-30667-1-git-send-email-ykk@rock-chips.com> References: <1449470239-30667-1-git-send-email-ykk@rock-chips.com> Sender: linux-samsung-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_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 "force-hpd" to indicate this sutiation. Signed-off-by: Yakir Yang Acked-by: Rob Herring Tested-by: Javier Martinez Canillas --- Changes in v10.2: - Add the ack from Rob Herring - Fix the omissive "analogix,need-force-hpd" in Exynos DP document Changes in v10.1: - Rename the "analogix,need-force-hpd" to common 'force-hpd' (Rob) Changes in v9: None Changes in v8: None Changes in v7: None Changes in v6: None 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 .../bindings/display/bridge/analogix_dp.txt | 4 ++- .../bindings/display/exynos/exynos_dp.txt | 1 + .../display/rockchip/analogix_dp-rockchip.txt | 1 + drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 35 ++++++++++++++++++---- drivers/gpu/drm/bridge/analogix/analogix_dp_core.h | 2 ++ drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c | 9 ++++++ 6 files changed, 46 insertions(+), 6 deletions(-) diff --git a/Documentation/devicetree/bindings/display/bridge/analogix_dp.txt b/Documentation/devicetree/bindings/display/bridge/analogix_dp.txt index 7659a7a..4f2ba8c 100644 --- a/Documentation/devicetree/bindings/display/bridge/analogix_dp.txt +++ b/Documentation/devicetree/bindings/display/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: + -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/display/exynos/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/display/exynos/exynos_dp.txt b/Documentation/devicetree/bindings/display/exynos/exynos_dp.txt index 9905081..8800164 100644 --- a/Documentation/devicetree/bindings/display/exynos/exynos_dp.txt +++ b/Documentation/devicetree/bindings/display/exynos/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) + -force-hpd (optional) -video interfaces (optional) Deprecated properties for DisplayPort: diff --git a/Documentation/devicetree/bindings/display/rockchip/analogix_dp-rockchip.txt b/Documentation/devicetree/bindings/display/rockchip/analogix_dp-rockchip.txt index dae86c4..187a708e 100644 --- a/Documentation/devicetree/bindings/display/rockchip/analogix_dp-rockchip.txt +++ b/Documentation/devicetree/bindings/display/rockchip/analogix_dp-rockchip.txt @@ -32,6 +32,7 @@ For the below properties, please refer to Analogix DP binding document: - phys (required) - phy-names (required) - hpd-gpios (optional) +- force-hpd (optional) ------------------------------------------------------------------------------- Example: diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c index a11504b..00aee44 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->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; } @@ -1246,6 +1269,8 @@ 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->force_hpd = of_property_read_bool(dev->of_node, "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 e6f8243..07e147c 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 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;