From patchwork Wed Jun 19 18:21:56 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lucas Stach X-Patchwork-Id: 13704366 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 68E0EC27C53 for ; Wed, 19 Jun 2024 18:23:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=AF8SvC/43klqasrrEIg/FVeQtn5ZKYuTuYQ7aiU8i8A=; b=ZzeGIu8JZ9UPz4 bH544rC6YCmp7dYkLZUnDSouyhl2HNRDcWi7cdF1URKst1ovox2n4VVRrwUFdg1lfUqiaHwb6YGHo zEYxJAjiXGLVTeDb7xQpZQjgT29DUR50v/GKTi/DqDB/Ls1lhnhbTqR6D1sVbmvqXQns849lspC59 UNg6vfCJ+NF/2UA6N0y07lq4TQnlE9PHamJiQ1ATvdyOBWU5f1TsO/Hq0y79i+yWM0c3Evld7ix6k bD64tqxTVfRNMwARJDkkp89i/qtmoBiq3Dr657evZg9RyWW/Jj2IVdZYCMPmqErfNV1skfWiLiyTe ErBtCLgzjX4t3LNHNkwA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sJzxl-00000002MEB-3fHj; Wed, 19 Jun 2024 18:23:17 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sJzws-00000002Lma-2eTR for linux-rockchip@bombadil.infradead.org; Wed, 19 Jun 2024 18:22:22 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Content-Transfer-Encoding:MIME-Version :References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=pvE2Ree7Db81WaBGHsfoAyQy+7pi+1kzBxaVLkcsl5U=; b=HC2YAHq+IEf7fkVMhB2O3U7mFl BuCbac1TRJ7PeTGiQipSo0B/IV4ewIsJltZsuM1pNAofEj6194H1WucQT8qGAGHmRe8D8Qzk+CquU ewMNByZAIxkqDc/+fApGCBjxgMK8UYXk5K0Gn8qkXiQWodYQszTZ6vKsukZPup++ELEGc7IU75rAi 15YHv86bcucFnHK2QU3VngFJwtZJ98Ggzr2WauyCxJBFZjfLGuVdj5GtiNL1Dn7Kfrol386uiEK+O aZKU0Ed3iALh+B7kfOX476dSQ/LcHOcYiq3rPqEboscC2ejEmUXJOZwc2rBS8ObYth2Ce2O0qTm7F gyNhcmaw==; Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by desiato.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sJzwo-00000007OlY-2fRc for linux-rockchip@lists.infradead.org; Wed, 19 Jun 2024 18:22:21 +0000 Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1sJzwX-00049h-K6; Wed, 19 Jun 2024 20:22:01 +0200 Received: from [2a0a:edc0:0:1101:1d::28] (helo=dude02.red.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtp (Exim 4.94.2) (envelope-from ) id 1sJzwX-003WTo-1y; Wed, 19 Jun 2024 20:22:01 +0200 From: Lucas Stach To: Robert Foss Cc: Neil Armstrong , Andrzej Hajda , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-samsung-soc@vger.kernel.org, patchwork-lst@pengutronix.de, kernel@pengutronix.de Subject: [PATCH v2 10/14] drm/bridge: analogix_dp: move macro reset after link bandwidth setting Date: Wed, 19 Jun 2024 20:21:56 +0200 Message-Id: <20240619182200.3752465-10-l.stach@pengutronix.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240619182200.3752465-1-l.stach@pengutronix.de> References: <20240619182200.3752465-1-l.stach@pengutronix.de> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: l.stach@pengutronix.de X-SA-Exim-Scanned: No (on metis.whiteo.stw.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-rockchip@lists.infradead.org X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240619_192218_944245_3ACF772C X-CRM114-Status: GOOD ( 10.92 ) X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+linux-rockchip=archiver.kernel.org@lists.infradead.org Setting the link bandwidth may change the PLL parameters, which will cause the PLL to go out of lock, so make sure to apply the MACRO_RST, which according to the comment is required to be pulsed after the PLL is locked. Signed-off-by: Lucas Stach Reviewed-by: Robert Foss Tested-by: Heiko Stuebner (rk3288-veyron and rk3399-gru) --- .../gpu/drm/bridge/analogix/analogix_dp_core.c | 18 ++++++++++-------- 1 file changed, 10 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c index bbf2c0808ace..d2c7a9117ce3 100644 --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c @@ -243,6 +243,11 @@ static int analogix_dp_link_start(struct analogix_dp_device *dp) /* Set link rate and count as you want to establish*/ analogix_dp_set_link_bandwidth(dp, dp->link_train.link_rate); + /* + * MACRO_RST must be applied after the PLL_LOCK to avoid + * the DP inter pair skew issue for at least 10 us + */ + analogix_dp_reset_macro(dp); analogix_dp_set_lane_count(dp, dp->link_train.lane_count); /* Setup RX configuration */ @@ -562,12 +567,6 @@ static int analogix_dp_full_link_train(struct analogix_dp_device *dp, int retval = 0; bool training_finished = false; - /* - * MACRO_RST must be applied after the PLL_LOCK to avoid - * the DP inter pair skew issue for at least 10 us - */ - analogix_dp_reset_macro(dp); - /* Initialize by reading RX's DPCD */ analogix_dp_get_max_rx_bandwidth(dp, &dp->link_train.link_rate); analogix_dp_get_max_rx_lane_count(dp, &dp->link_train.lane_count); @@ -634,9 +633,12 @@ static int analogix_dp_fast_link_train(struct analogix_dp_device *dp) u8 link_align, link_status[2]; enum pll_status status; - analogix_dp_reset_macro(dp); - analogix_dp_set_link_bandwidth(dp, dp->link_train.link_rate); + /* + * MACRO_RST must be applied after the PLL_LOCK to avoid + * the DP inter pair skew issue for at least 10 us + */ + analogix_dp_reset_macro(dp); analogix_dp_set_lane_count(dp, dp->link_train.lane_count); analogix_dp_set_lane_link_training(dp);