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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BE9E8C433F5 for ; Fri, 17 Dec 2021 09:54:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234565AbhLQJyD (ORCPT ); Fri, 17 Dec 2021 04:54:03 -0500 Received: from twspam01.aspeedtech.com ([211.20.114.71]:40775 "EHLO twspam01.aspeedtech.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232718AbhLQJyC (ORCPT ); Fri, 17 Dec 2021 04:54:02 -0500 Received: from mail.aspeedtech.com ([192.168.0.24]) by twspam01.aspeedtech.com with ESMTP id 1BH9SGrS026176; Fri, 17 Dec 2021 17:28:16 +0800 (GMT-8) (envelope-from jammy_huang@aspeedtech.com) Received: from JammyHuang-PC.aspeed.com (192.168.2.115) by TWMBX02.aspeed.com (192.168.0.24) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Fri, 17 Dec 2021 17:53:46 +0800 From: Jammy Huang To: , , , , , , , , Subject: [PATCH 4/4] media: aspeed: Fix timing polarity incorrect Date: Fri, 17 Dec 2021 17:54:03 +0800 Message-ID: <20211217095403.2618-5-jammy_huang@aspeedtech.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211217095403.2618-1-jammy_huang@aspeedtech.com> References: <20211217095403.2618-1-jammy_huang@aspeedtech.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII X-Originating-IP: [192.168.2.115] X-ClientProxiedBy: TWMBX02.aspeed.com (192.168.0.24) To TWMBX02.aspeed.com (192.168.0.24) X-DNSRBL: X-MAIL: twspam01.aspeedtech.com 1BH9SGrS026176 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is a workaround for polarity unstable. Sync value get by VR09C counts from sync's rising edge, which means sync's polarity is negative if sync value is bigger than total/2. Signed-off-by: Jammy Huang --- drivers/media/platform/aspeed-video.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c index 5ad3a20c5bac..f628f69bb7dd 100644 --- a/drivers/media/platform/aspeed-video.c +++ b/drivers/media/platform/aspeed-video.c @@ -989,6 +989,15 @@ static void aspeed_video_get_resolution(struct aspeed_video *video) video->frame_top = FIELD_GET(VE_SRC_TB_EDGE_DET_TOP, src_tb_edge); det->vsync = FIELD_GET(VE_SYNC_STATUS_VSYNC, sync); + /* + * Workaround for polarity detection + * Use sync(VR098) counts from sync's rising edge till falling + * edge to tell sync polarity. + */ + if (det->vsync > (FIELD_GET(VE_MODE_DETECT_V_LINES, mds) >> 1)) + det->polarities &= ~V4L2_DV_VSYNC_POS_POL; + else + det->polarities |= V4L2_DV_VSYNC_POS_POL; if (det->polarities & V4L2_DV_VSYNC_POS_POL) { det->vbackporch = video->frame_top - det->vsync; det->vfrontporch = @@ -1010,6 +1019,15 @@ static void aspeed_video_get_resolution(struct aspeed_video *video) video->frame_left = FIELD_GET(VE_SRC_LR_EDGE_DET_LEFT, src_lr_edge); det->hsync = FIELD_GET(VE_SYNC_STATUS_HSYNC, sync); + /* + * Workaround for polarity detection + * Use sync(VR098) counts from sync's rising edge till falling + * edge to tell sync polarity. + */ + if (det->hsync > (htotal >> 1)) + det->polarities &= ~V4L2_DV_HSYNC_POS_POL; + else + det->polarities |= V4L2_DV_HSYNC_POS_POL; if (det->polarities & V4L2_DV_HSYNC_POS_POL) { det->hbackporch = video->frame_left - det->hsync; det->hfrontporch = htotal - video->frame_right; -- 2.25.1