From patchwork Fri May 31 12:00:33 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jani Nikula X-Patchwork-Id: 13681594 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4DD62C25B75 for ; Fri, 31 May 2024 12:01:08 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id E3B7E10E6F8; Fri, 31 May 2024 12:01:06 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="JUb8fw6w"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.8]) by gabe.freedesktop.org (Postfix) with ESMTPS id 0FA9B10E5FB; Fri, 31 May 2024 12:00:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1717156859; x=1748692859; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=lDcs9Jm2G2+qFaU8M6G4gKlFJEEMAh2YAbmNmj2oa6E=; b=JUb8fw6wlNcvEbyRPcaxngmwjbvnQH5JKAgtRclbidbdMtO4p2pqsPQs tZGWC6PBfs5/AxiJnZfUfLUTBSgbQ+w7l7aAV4lvbjLg7wFLsDkzCjiKR x85Ts0nCX1wJiyehYoU07aqW9PxC2IyqSGifI7vTEMxF+QV4WPME6TsJO PcL8kPsJHP5CXoeC6XRzD0zwFWh6uGmA9oiSHAYWQHgiZY6SbwORMtUgo gqJTfm1HGvi1TjeIBy4YnJpyysEME48RpbAEJ6HvMwnXPN6ur7z3zuZ17 eahumR1tXL0QdyBvOuXzsi6Pl/dyzOoKF14RM6IROOw4I7SOasATnR0bc g==; X-CSE-ConnectionGUID: 5Ax9KE1bT06o9ckLpRJp4g== X-CSE-MsgGUID: b2XJJ1eSRGqrKn2wnvqLRg== X-IronPort-AV: E=McAfee;i="6600,9927,11088"; a="31223876" X-IronPort-AV: E=Sophos;i="6.08,204,1712646000"; d="scan'208";a="31223876" Received: from fmviesa007.fm.intel.com ([10.60.135.147]) by fmvoesa102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 May 2024 05:00:59 -0700 X-CSE-ConnectionGUID: 7TFy1CyUT6KcBQYl5mWsmw== X-CSE-MsgGUID: ZU7afWMFS+idfHnOP81gfg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.08,204,1712646000"; d="scan'208";a="36076213" Received: from bergbenj-mobl1.ger.corp.intel.com (HELO localhost) ([10.245.246.190]) by fmviesa007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 May 2024 05:00:55 -0700 From: Jani Nikula To: dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org Cc: intel-gfx@lists.freedesktop.org, Alex Deucher , =?utf-8?q?Christian_K=C3=B6nig?= , Pan Xinhui , jani.nikula@intel.com Subject: [PATCH 3/3] drm/amd/display: switch to guid_gen() to generate valid GUIDs Date: Fri, 31 May 2024 15:00:33 +0300 Message-Id: <4ef8a2a1985599389b89ee5828df029e5e9725d8.1717156602.git.jani.nikula@intel.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: References: MIME-Version: 1.0 Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" Instead of just smashing jiffies into a GUID, use guid_gen() to generate RFC 4122 compliant GUIDs. Signed-off-by: Jani Nikula --- Side note, it baffles me why amdgpu has a copy of this instead of plumbing it into drm mst code. --- .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 23 ++++++++++--------- 1 file changed, 12 insertions(+), 11 deletions(-) diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c index 65ebc01dc90f..a1bd847857b8 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -2403,9 +2403,9 @@ static int dm_late_init(void *handle) static void resume_mst_branch_status(struct drm_dp_mst_topology_mgr *mgr) { + u8 buf[UUID_SIZE]; + guid_t guid; int ret; - u8 guid[16]; - u64 tmp64; mutex_lock(&mgr->lock); if (!mgr->mst_primary) @@ -2426,26 +2426,27 @@ static void resume_mst_branch_status(struct drm_dp_mst_topology_mgr *mgr) } /* Some hubs forget their guids after they resume */ - ret = drm_dp_dpcd_read(mgr->aux, DP_GUID, guid, 16); - if (ret != 16) { + ret = drm_dp_dpcd_read(mgr->aux, DP_GUID, buf, sizeof(buf)); + if (ret != sizeof(buf)) { drm_dbg_kms(mgr->dev, "dpcd read failed - undocked during suspend?\n"); goto out_fail; } - if (memchr_inv(guid, 0, 16) == NULL) { - tmp64 = get_jiffies_64(); - memcpy(&guid[0], &tmp64, sizeof(u64)); - memcpy(&guid[8], &tmp64, sizeof(u64)); + import_guid(&guid, buf); - ret = drm_dp_dpcd_write(mgr->aux, DP_GUID, guid, 16); + if (guid_is_null(&guid)) { + guid_gen(&guid); + export_guid(buf, &guid); - if (ret != 16) { + ret = drm_dp_dpcd_write(mgr->aux, DP_GUID, buf, sizeof(buf)); + + if (ret != sizeof(buf)) { drm_dbg_kms(mgr->dev, "check mstb guid failed - undocked during suspend?\n"); goto out_fail; } } - import_guid(&mgr->mst_primary->guid, guid); + guid_copy(&mgr->mst_primary->guid, &guid); out_fail: mutex_unlock(&mgr->lock);