From patchwork Fri Aug 7 10:51:49 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yakir Yang X-Patchwork-Id: 6967951 Return-Path: X-Original-To: patchwork-linux-samsung-soc@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 CF6219F373 for ; Fri, 7 Aug 2015 10:54:31 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id E46D92067A for ; Fri, 7 Aug 2015 10:54:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EA73120657 for ; Fri, 7 Aug 2015 10:54:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752022AbbHGKyQ (ORCPT ); Fri, 7 Aug 2015 06:54:16 -0400 Received: from regular1.263xmail.com ([211.150.99.137]:44452 "EHLO regular1.263xmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751667AbbHGKyB (ORCPT ); Fri, 7 Aug 2015 06:54:01 -0400 Received: from ykk?rock-chips.com (unknown [192.168.167.11]) by regular1.263xmail.com (Postfix) with SMTP id 3A7637DD2; Fri, 7 Aug 2015 18:53:55 +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 BD455440; Fri, 7 Aug 2015 18:53:50 +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: <39e2c56c34f5b8d85948106db7448913> 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 28410Q244S2; Fri, 07 Aug 2015 18:53:54 +0800 (CST) From: Yakir Yang To: Heiko Stuebner , Russell King , Fabio Estevam , Jingoo Han , Inki Dae Cc: djkurtz@google.com, dianders@google.com, seanpaul@google.com, joe@perches.com, Takashi Iwai , Andrzej Hajda , Thierry Reding , Philipp Zabel , David Airlie , Gustavo Padovan , Seung-Woo Kim , Kyungmin Park , Krzysztof Kozlowski , Kukjin Kim , Ajay Kumar , Joonyoung Shim , Vincent Palatin , Mark Yao , Andy Yan , ajaynumb@gmail.com, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org, Yakir Yang Subject: [PATCH v2 7/8] drm: bridge: analogix_dp: try force hpd after plug in lookup failed Date: Fri, 7 Aug 2015 05:51:49 -0500 Message-Id: <1438944709-19091-1-git-send-email-ykk@rock-chips.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1438943674-18191-1-git-send-email-ykk@rock-chips.com> References: <1438943674-18191-1-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=-7.0 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, 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. Besides 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. Signed-off-by: Yakir Yang --- Changes in v2: None drivers/gpu/drm/bridge/analogix_dp_core.c | 28 +++++++++++++++++++++++----- drivers/gpu/drm/bridge/analogix_dp_core.h | 1 + drivers/gpu/drm/bridge/analogix_dp_reg.c | 9 +++++++++ 3 files changed, 33 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/bridge/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix_dp_core.c index 44be01d..efd810c 100644 --- a/drivers/gpu/drm/bridge/analogix_dp_core.c +++ b/drivers/gpu/drm/bridge/analogix_dp_core.c @@ -66,15 +66,33 @@ 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. + * + * Besides 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 -ETIMEDOUT; + } + + dev_dbg(dp->dev, "success to get plug in status after force hpd\n"); + return 0; } diff --git a/drivers/gpu/drm/bridge/analogix_dp_core.h b/drivers/gpu/drm/bridge/analogix_dp_core.h index 713c57f..53f3973 100644 --- a/drivers/gpu/drm/bridge/analogix_dp_core.h +++ b/drivers/gpu/drm/bridge/analogix_dp_core.h @@ -182,6 +182,7 @@ 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;