From patchwork Fri Apr 15 19:40:10 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: cpaul@redhat.com X-Patchwork-Id: 8857781 Return-Path: X-Original-To: patchwork-intel-gfx@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 7BDB59F1D3 for ; Fri, 15 Apr 2016 19:40:39 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id A028F20155 for ; Fri, 15 Apr 2016 19:40:38 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id 3EF3D20295 for ; Fri, 15 Apr 2016 19:40:37 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 892836ED10; Fri, 15 Apr 2016 19:40:35 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by gabe.freedesktop.org (Postfix) with ESMTPS id 0BE5B6ED0B; Fri, 15 Apr 2016 19:40:30 +0000 (UTC) Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 43126C01AA2D; Fri, 15 Apr 2016 19:40:29 +0000 (UTC) Received: from ecstaticemu.bos.redhat.com (dhcp-25-142.bos.redhat.com [10.18.25.142]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u3FJeQXH011364; Fri, 15 Apr 2016 15:40:28 -0400 From: Lyude To: intel-gfx@lists.freedesktop.org, =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Fri, 15 Apr 2016 15:40:10 -0400 Message-Id: <1460749210-23577-2-git-send-email-cpaul@redhat.com> In-Reply-To: <1460749210-23577-1-git-send-email-cpaul@redhat.com> References: <1459284390-14485-1-git-send-email-cpaul@redhat.com> <1460749210-23577-1-git-send-email-cpaul@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.23 Cc: David Airlie , stable@vger.kernel.org, "open list:INTEL DRM DRIVERS excluding Poulsbo, Moorestow..., linux-kernel@vger.kernel.org open list" , Daniel Vetter Subject: [Intel-gfx] [PATCH v2 2/2] drm/i915/vlv: Reset the ADPA in vlv_display_power_well_init() X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" X-Spam-Status: No, score=-5.2 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 While VGA hotplugging worked(ish) before, it looks like that was mainly because we'd unintentionally enable it in valleyview_crt_detect_hotplug() when we did a force trigger. This doesn't work reliably enough because whenever the display powerwell on vlv gets disabled, the values set in VLV_ADPA get cleared and consequently VGA hotplugging gets disabled. This causes bugs such as one we found on an Intel NUC, where doing the following sequence of hotplugs: - Disconnect all monitors - Connect VGA - Disconnect VGA - Connect HDMI Would result in VGA hotplugging becoming disabled, due to the powerwells getting toggled in the process of connecting HDMI. Changes since v1: - Instead of handling the register writes ourself, we just reuse intel_crt_detect() - Instead of resetting the ADPA during display IRQ installation, we now reset them in vlv_display_power_well_init() CC: stable@vger.kernel.org Signed-off-by: Lyude --- drivers/gpu/drm/i915/intel_runtime_pm.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c index 80e8bd4..c7d195f 100644 --- a/drivers/gpu/drm/i915/intel_runtime_pm.c +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c @@ -902,6 +902,7 @@ static bool vlv_power_well_enabled(struct drm_i915_private *dev_priv, static void vlv_display_power_well_init(struct drm_i915_private *dev_priv) { + struct drm_encoder *encoder, *vga_encoder = NULL; enum pipe pipe; /* @@ -935,6 +936,17 @@ static void vlv_display_power_well_init(struct drm_i915_private *dev_priv) intel_hpd_init(dev_priv); + /* Re-enable the ADPA, if we have one */ + drm_for_each_encoder(encoder, dev_priv->dev) { + if (encoder->encoder_type == DRM_MODE_ENCODER_DAC) { + vga_encoder = encoder; + break; + } + } + + if (vga_encoder && vga_encoder->funcs->reset) + vga_encoder->funcs->reset(vga_encoder); + i915_redisable_vga_power_on(dev_priv->dev); }