From patchwork Fri Jul 13 13:59:41 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: "Kumar, Mahesh" X-Patchwork-Id: 10523393 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 6527C602A0 for ; Fri, 13 Jul 2018 14:00:40 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 550D229873 for ; Fri, 13 Jul 2018 14:00:40 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 538EE29B4B; Fri, 13 Jul 2018 14:00:40 +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 1D4FB29BC7 for ; Fri, 13 Jul 2018 14:00:40 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id E3A316F26F; Fri, 13 Jul 2018 13:59:50 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by gabe.freedesktop.org (Postfix) with ESMTPS id ADAB86F257; Fri, 13 Jul 2018 13:59:45 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga101.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 13 Jul 2018 06:59:43 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.51,347,1526367600"; d="scan'208";a="54790033" Received: from unknown (HELO localhost.localdomain) ([10.223.25.241]) by fmsmga008.fm.intel.com with ESMTP; 13 Jul 2018 06:58:07 -0700 From: Mahesh Kumar To: intel-gfx@lists.freedesktop.org Subject: [PATCH v4 09/10] Revert "drm: crc: Wait for a frame before returning from open()" Date: Fri, 13 Jul 2018 19:29:41 +0530 Message-Id: <20180713135942.25061-10-mahesh1.kumar@intel.com> X-Mailer: git-send-email 2.16.2 In-Reply-To: <20180713135942.25061-1-mahesh1.kumar@intel.com> References: <20180713135942.25061-1-mahesh1.kumar@intel.com> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Tomeu Vizoso , Mahesh Kumar , laurent.pinchart@ideasonboard.com, dri-devel@lists.freedesktop.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP This reverts commit e8fa5671183c80342d520ad81d14fa79a9d4a680. Don't wait for first CRC during crtc_crc_open. It avoids one frame wait during open. If application want to wait after read call, it can use poll/read blocking read() call. Suggested-by: Ville Syrjälä Signed-off-by: Mahesh Kumar Cc: dri-devel@lists.freedesktop.org Cc: Tomeu Vizoso Reviewed-by: Laurent Pinchart --- drivers/gpu/drm/drm_debugfs_crc.c | 16 ---------------- 1 file changed, 16 deletions(-) diff --git a/drivers/gpu/drm/drm_debugfs_crc.c b/drivers/gpu/drm/drm_debugfs_crc.c index 3e0a2cfaa35c..00e743153e94 100644 --- a/drivers/gpu/drm/drm_debugfs_crc.c +++ b/drivers/gpu/drm/drm_debugfs_crc.c @@ -228,24 +228,8 @@ static int crtc_crc_open(struct inode *inode, struct file *filep) if (ret) goto err; - spin_lock_irq(&crc->lock); - /* - * Only return once we got a first frame, so userspace doesn't have to - * guess when this particular piece of HW will be ready to start - * generating CRCs. - */ - ret = wait_event_interruptible_lock_irq(crc->wq, - crtc_crc_data_count(crc), - crc->lock); - spin_unlock_irq(&crc->lock); - - if (ret) - goto err_disable; - return 0; -err_disable: - crtc->funcs->set_crc_source(crtc, NULL); err: spin_lock_irq(&crc->lock); crtc_crc_cleanup(crc);