From patchwork Wed Aug 19 14:51:59 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yakir Yang X-Patchwork-Id: 7038131 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 851D29F372 for ; Wed, 19 Aug 2015 14:55:43 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 36EFC207D1 for ; Wed, 19 Aug 2015 14:55:42 +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 132F0207C0 for ; Wed, 19 Aug 2015 14:55:41 +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 1ZS4jE-0004aB-1G; Wed, 19 Aug 2015 14:52:36 +0000 Received: from regular1.263xmail.com ([211.150.99.140]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZS4j8-000421-Jp; Wed, 19 Aug 2015 14:52:34 +0000 Received: from ykk?rock-chips.com (unknown [192.168.167.156]) by regular1.263xmail.com (Postfix) with SMTP id 48BCF4A87; Wed, 19 Aug 2015 22:52:03 +0800 (CST) X-263anti-spam: KSV:0; X-MAIL-GRAY: 0 X-MAIL-DELIVERY: 1 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 5164E11ED7; Wed, 19 Aug 2015 22:52:01 +0800 (CST) X-RL-SENDER: ykk@rock-chips.com X-FST-TO: heiko@sntech.de X-SENDER-IP: 58.22.7.114 X-LOGIN-NAME: ykk@rock-chips.com X-UNIQUE-TAG: <98a1117813e251167e1c3748cc8ecef4> 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 229733TS6HQ; Wed, 19 Aug 2015 22:52:04 +0800 (CST) From: Yakir Yang To: Heiko Stuebner , Thierry Reding , Jingoo Han , Fabio Estevam , Inki Dae , joe@perches.com, Russell King Subject: [PATCH v3 11/14] drm: bridge: analogix_dp: try force hpd after plug in lookup failed Date: Wed, 19 Aug 2015 09:51:59 -0500 Message-Id: <1439995919-18668-1-git-send-email-ykk@rock-chips.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1439995728-18046-1-git-send-email-ykk@rock-chips.com> References: <1439995728-18046-1-git-send-email-ykk@rock-chips.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150819_075232_315746_9274C1FB X-CRM114-Status: GOOD ( 16.10 ) 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: seanpaul@google.com, Takashi Iwai , dri-devel@lists.freedesktop.org, Andrzej Hajda , Yakir Yang , Gustavo Padovan , linux-samsung-soc@vger.kernel.org, Vincent Palatin , linux-rockchip@lists.infradead.org, Kishon Vijay Abraham I , David Airlie , devicetree@vger.kernel.org, Pawel Moll , Ian Campbell , dianders@google.com, Rob Herring , linux-arm-kernel@lists.infradead.org, Mark Yao , linux-kernel@vger.kernel.org, Kyungmin Park , djkurtz@google.com, Philipp Zabel , 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=-4.8 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 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 | 3 ++ .../bindings/video/analogix_dp-rockchip.txt | 1 + .../devicetree/bindings/video/exynos_dp.txt | 1 + drivers/gpu/drm/bridge/analogix_dp_core.c | 36 +++++++++++++++++++--- drivers/gpu/drm/bridge/analogix_dp_core.h | 2 ++ drivers/gpu/drm/bridge/analogix_dp_reg.c | 9 ++++++ 6 files changed, 47 insertions(+), 5 deletions(-) diff --git a/Documentation/devicetree/bindings/drm/bridge/analogix_dp.txt b/Documentation/devicetree/bindings/drm/bridge/analogix_dp.txt index 6127018..b043200 100644 --- a/Documentation/devicetree/bindings/drm/bridge/analogix_dp.txt +++ b/Documentation/devicetree/bindings/drm/bridge/analogix_dp.txt @@ -40,6 +40,9 @@ Required properties for dp-controller: * Documentation/devicetree/bindings/video/analogix_dp-rockchip.txt 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. -analogix,hpd-gpio: Hotplug detect GPIO. Indicates which GPIO should be used for hotplug diff --git a/Documentation/devicetree/bindings/video/analogix_dp-rockchip.txt b/Documentation/devicetree/bindings/video/analogix_dp-rockchip.txt index 99fd421..752005e 100644 --- a/Documentation/devicetree/bindings/video/analogix_dp-rockchip.txt +++ b/Documentation/devicetree/bindings/video/analogix_dp-rockchip.txt @@ -27,6 +27,7 @@ For the below properties, please refer to Analogix DP binding document: - analogix,color-depth (required) - analogix,link-rate (required) - analogix,lane-count (required) +- analogix,need-force-hpd (optional) - analogix,hpd-gpio (optional) - video interfaces (optional) ------------------------------------------------------------------------------- diff --git a/Documentation/devicetree/bindings/video/exynos_dp.txt b/Documentation/devicetree/bindings/video/exynos_dp.txt index 177506f..ba20416 100644 --- a/Documentation/devicetree/bindings/video/exynos_dp.txt +++ b/Documentation/devicetree/bindings/video/exynos_dp.txt @@ -53,6 +53,7 @@ For the below properties, please refer to Analogix DP binding document: -analogix,color-depth (required) -analogix,link-rate (required) -analogix,lane-count (required) + -analogix,need-force-hpd (optional) -analogix,hpd-gpio (optional) -video interfaces (optional) ------------------------------------------------------------------------------- diff --git a/drivers/gpu/drm/bridge/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix_dp_core.c index 1778e0a..99870f7 100644 --- a/drivers/gpu/drm/bridge/analogix_dp_core.c +++ b/drivers/gpu/drm/bridge/analogix_dp_core.c @@ -63,15 +63,38 @@ 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 (DP_TIMEOUT_LOOP_COUNT < timeout_loop) { - 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; } @@ -1272,6 +1295,9 @@ 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, "analogix,hpd-gpio", 0); if (gpio_is_valid(dp->hpd_gpio)) { diff --git a/drivers/gpu/drm/bridge/analogix_dp_core.h b/drivers/gpu/drm/bridge/analogix_dp_core.h index 941b34f..2405155 100644 --- a/drivers/gpu/drm/bridge/analogix_dp_core.h +++ b/drivers/gpu/drm/bridge/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_dp_reg.c b/drivers/gpu/drm/bridge/analogix_dp_reg.c index a0fc1fb..bf7cee1 100644 --- a/drivers/gpu/drm/bridge/analogix_dp_reg.c +++ b/drivers/gpu/drm/bridge/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;