From mboxrd@z Thu Jan 1 00:00:00 1970 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 E005AC433F5 for ; Mon, 30 May 2022 10:08:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232002AbiE3KIn (ORCPT ); Mon, 30 May 2022 06:08:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60944 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234605AbiE3KIk (ORCPT ); Mon, 30 May 2022 06:08:40 -0400 Received: from mailgw02.mediatek.com (unknown [210.61.82.184]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2E44F7B9CD; Mon, 30 May 2022 03:08:38 -0700 (PDT) X-UUID: 34d71082f2294258b1b74adaad5ab8f4-20220530 X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.5,REQID:4c9ce4b4-4be1-413f-83e7-68bcbae0e369,OB:0,LO B:0,IP:0,URL:0,TC:0,Content:0,EDM:0,RT:0,SF:0,FILE:0,RULE:Release_Ham,ACTI ON:release,TS:0 X-CID-META: VersionHash:2a19b09,CLOUDID:626cc6b8-3c45-407b-8f66-25095432a27a,C OID:IGNORED,Recheck:0,SF:nil,TC:nil,Content:0,EDM:-3,IP:nil,URL:0,File:nil ,QS:0,BEC:nil X-UUID: 34d71082f2294258b1b74adaad5ab8f4-20220530 Received: from mtkmbs11n2.mediatek.inc [(172.21.101.187)] by mailgw02.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 1333704574; Mon, 30 May 2022 18:08:34 +0800 Received: from mtkmbs07n1.mediatek.inc (172.21.101.16) by mtkmbs10n2.mediatek.inc (172.21.101.183) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.2.792.3; Mon, 30 May 2022 18:08:33 +0800 Received: from mtkcas10.mediatek.inc (172.21.101.39) by mtkmbs07n1.mediatek.inc (172.21.101.16) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 30 May 2022 18:08:33 +0800 Received: from mtksdccf07 (172.21.84.99) by mtkcas10.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Mon, 30 May 2022 18:08:33 +0800 Message-ID: <828da579f872747943dbb7684b35f58bc592c6ca.camel@mediatek.com> Subject: Re: [PATCH v10 18/21] drm/mediatek: Add mt8195 Embedded DisplayPort driver From: CK Hu To: Guillaume Ranquet , Chun-Kuang Hu , Philipp Zabel , "David Airlie" , Daniel Vetter , Rob Herring , Krzysztof Kozlowski , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Matthias Brugger , Chunfeng Yun , "Kishon Vijay Abraham I" , Vinod Koul , "Helge Deller" , Jitao shi CC: Markus Schneider-Pargmann , , , , , , , Date: Mon, 30 May 2022 18:08:33 +0800 In-Reply-To: <20220523104758.29531-19-granquet@baylibre.com> References: <20220523104758.29531-1-granquet@baylibre.com> <20220523104758.29531-19-granquet@baylibre.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.2 MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-MTK: N Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Hi, Guillaume: On Mon, 2022-05-23 at 12:47 +0200, Guillaume Ranquet wrote: > From: Markus Schneider-Pargmann > > This patch adds a DisplayPort driver for the Mediatek mt8195 SoC. > > It supports the mt8195, the embedded DisplayPort units. It offers > DisplayPort 1.4 with up to 4 lanes. > > The driver creates a child device for the phy. The child device will > never exist without the parent being active. As they are sharing a > register range, the parent passes a regmap pointer to the child so > that > both can work with the same register range. The phy driver sets > device > data that is read by the parent to get the phy device that can be > used > to control the phy properties. > > This driver is based on an initial version by > Jason-JH.Lin . > > Signed-off-by: Markus Schneider-Pargmann > Signed-off-by: Guillaume Ranquet > --- > [snip] > + > +static irqreturn_t mtk_dp_hpd_isr_handler(struct mtk_dp *mtk_dp) > +{ > + bool connected; > + u16 swirq_status = mtk_dp_swirq_get_clear(mtk_dp); > + u8 hwirq_status = mtk_dp_hwirq_get_clear(mtk_dp); > + struct mtk_dp_train_info *train_info = &mtk_dp->train_info; > + > + train_info->irq_status |= hwirq_status | swirq_status; You mix software control variable and irq status here. Break each flag in irq_status to variables in train_info to decouple software control variable and irq status. > + > + if (!train_info->irq_status) > + return IRQ_HANDLED; > + > + connected = mtk_dp_plug_state(mtk_dp); > + if (connected || !train_info->cable_plugged_in) > + train_info->irq_status &= ~MTK_DP_HPD_DISCONNECT; > + else if (!connected || train_info->cable_plugged_in) > + train_info->irq_status &= ~MTK_DP_HPD_CONNECT; > + > + if (!(train_info->irq_status & > + (MTK_DP_HPD_CONNECT | MTK_DP_HPD_DISCONNECT))) > + return IRQ_HANDLED; > + > + if (train_info->irq_status & MTK_DP_HPD_CONNECT) { > + train_info->irq_status &= ~MTK_DP_HPD_CONNECT; > + train_info->cable_plugged_in = true; > + } else { > + train_info->irq_status &= ~MTK_DP_HPD_DISCONNECT; > + train_info->cable_plugged_in = false; > + mtk_dp->train_state = MTK_DP_TRAIN_STATE_STARTUP; > + } > + train_info->cable_state_change = true; > + > + return IRQ_WAKE_THREAD; > +} > +