From patchwork Fri Apr 12 14:06:16 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gwan-gyeong Mun X-Patchwork-Id: 10898467 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0794717E1 for ; Fri, 12 Apr 2019 14:06:34 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E322B28D5E for ; Fri, 12 Apr 2019 14:06:33 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D714E28D7A; Fri, 12 Apr 2019 14:06:33 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=unavailable version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 879DA28D5E for ; Fri, 12 Apr 2019 14:06:33 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id C47A2899E7; Fri, 12 Apr 2019 14:06:27 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by gabe.freedesktop.org (Postfix) with ESMTPS id 4C50E899E6; Fri, 12 Apr 2019 14:06:25 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga101.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 12 Apr 2019 07:06:25 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.60,341,1549958400"; d="scan'208";a="291021838" Received: from helsinki.fi.intel.com ([10.237.66.174]) by orsmga004.jf.intel.com with ESMTP; 12 Apr 2019 07:06:22 -0700 From: Gwan-gyeong Mun To: intel-gfx@lists.freedesktop.org Date: Fri, 12 Apr 2019 17:06:16 +0300 Message-Id: <20190412140617.17648-2-gwan-gyeong.mun@intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190412140617.17648-1-gwan-gyeong.mun@intel.com> References: <20190412140617.17648-1-gwan-gyeong.mun@intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH v6 1/2] drm: Add detection of changing of edid on between suspend and resume X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: dri-devel@lists.freedesktop.org Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" X-Virus-Scanned: ClamAV using ClamSMTP The hotplug detection routine of drm_helper_hpd_irq_event() can detect changing of status of connector, but it can not detect changing of edid. Following scenario requires detection of changing of edid. 1) plug display device to a connector 2) system suspend 3) unplug 1)'s display device and plug the other display device to a connector 4) system resume It adds edid check routine when a connector status still remains as "connector_status_connected". v2: Add NULL check before comparing of EDIDs. v3: Make it as part of existing drm_helper_hpd_irq_event() (Stan, Mika) v4: Rebased v5: Use a cached edid property blob data of connector instead of adding a new detected_edid variable. (Maarten) Add an using of reference count for getting a cached edid property blob data. (Maarten) v6: Fixes coding style. Testcase: igt/kms_chamelium/hdmi-edid-change-during-hibernate Testcase: igt/kms_chamelium/hdmi-edid-change-during-suspend Testcase: igt/kms_chamelium/dp-edid-change-during-hibernate Testcase: igt/kms_chamelium/dp-edid-change-during-suspend Signed-off-by: Gwan-gyeong Mun --- drivers/gpu/drm/drm_probe_helper.c | 34 +++++++++++++++++++++++++++++- 1 file changed, 33 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c index 6fd08e04b323..da8aff116ca4 100644 --- a/drivers/gpu/drm/drm_probe_helper.c +++ b/drivers/gpu/drm/drm_probe_helper.c @@ -742,7 +742,16 @@ EXPORT_SYMBOL(drm_kms_helper_poll_fini); * panels. * * This helper function is useful for drivers which can't or don't track hotplug - * interrupts for each connector. + * interrupts for each connector. And it also supports a detection of changing + * of edid on between suspend and resume when a connector status still remains + * as "connector_status_connected". + * + * Following scenario requires detection of changing of edid. + * 1) plug display device to a connector + * 2) system suspend + * 3) unplug 1)'s display device and plug the other display device to a + * connector + * 4) system resume * * Drivers which support hotplug interrupts for each connector individually and * which have a more fine-grained detect logic should bypass this code and @@ -760,6 +769,7 @@ bool drm_helper_hpd_irq_event(struct drm_device *dev) struct drm_connector *connector; struct drm_connector_list_iter conn_iter; enum drm_connector_status old_status; + struct drm_property_blob *old_edid_blob_ptr; bool changed = false; if (!dev->mode_config.poll_enabled) @@ -774,6 +784,11 @@ bool drm_helper_hpd_irq_event(struct drm_device *dev) old_status = connector->status; + if (connector->edid_blob_ptr) + old_edid_blob_ptr = drm_property_blob_get(connector->edid_blob_ptr); + else + old_edid_blob_ptr = NULL; + connector->status = drm_helper_probe_detect(connector, NULL, false); DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n", connector->base.id, @@ -782,6 +797,23 @@ bool drm_helper_hpd_irq_event(struct drm_device *dev) drm_get_connector_status_name(connector->status)); if (old_status != connector->status) changed = true; + + /* Check changing of edid when a connector status still remains + * as "connector_status_connected". + */ + if (old_edid_blob_ptr && connector->edid_blob_ptr && + old_status == connector->status && + old_status == connector_status_connected) { + if (memcmp(old_edid_blob_ptr->data, + connector->edid_blob_ptr->data, + old_edid_blob_ptr->length)) { + changed = true; + DRM_DEBUG_KMS("[CONNECTOR:%d:%s] edid updated\n", + connector->base.id, + connector->name); + } + } + drm_property_blob_put(old_edid_blob_ptr); } drm_connector_list_iter_end(&conn_iter); mutex_unlock(&dev->mode_config.mutex);