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 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 03BBAC433F5 for ; Mon, 30 May 2022 10:08:59 +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: Date:CC:To:From:Subject:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=3TuRnYKfB0B+rLPsPWNvX8gC/FoRMNorjOz0rSt8fbU=; b=sEqX1Cym54EjAq AklCczKxv37Xiwv4Rry3HP5DFBwFTb4ZFldvoQmbhkt9JQJORN8MWTrMJcz8wEcnQqzNPJ1zi2nVW ZlUiE2QOWCDeFTXjoX27JcwFhTjhAan7hszaKhy+xggZ+QFUrQlbATwxGRmryhxXjYEIKp/NZpnwM XOHzYJPvVbE9io1pyOOrbRuTj7c+x9lvuiBn3HVezf5O+a/qFzpyNRth16K7S9MOOur/mAM3sobDP J1mDnGAEwTa3k0NSGPO5ldc/yisIZurHf68/qW/7czroHg1a/haxG9K71nIxU41me3Td5lgoNX3wl P3M4zl0qGQ0Lz6e/AMqg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nvcKZ-006EWY-Es; Mon, 30 May 2022 10:08:59 +0000 Received: from mailgw01.mediatek.com ([216.200.240.184]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nvcKO-006ES9-Cx; Mon, 30 May 2022 10:08:50 +0000 X-UUID: fcaae020de7348fb9e61c7497d61bd2c-20220530 X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.5,REQID:ea7a6186-1b05-4bd0-8d0c-b6ff392be814,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:88ba0248-4fb1-496b-8f1d-39e733fed1ea,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: fcaae020de7348fb9e61c7497d61bd2c-20220530 Received: from mtkcas68.mediatek.inc [(172.29.94.19)] by mailgw01.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 1907799424; Mon, 30 May 2022 03:08:36 -0700 Received: from mtkmbs07n1.mediatek.inc (172.21.101.16) by MTKMBS62DR.mediatek.inc (172.29.94.18) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 30 May 2022 03:08:34 -0700 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> X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.2 MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220530_030848_470386_2ADD4FD6 X-CRM114-Status: GOOD ( 23.03 ) X-BeenThere: linux-phy@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux Phy Mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-phy" Errors-To: linux-phy-bounces+linux-phy=archiver.kernel.org@lists.infradead.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; > +} > + -- linux-phy mailing list linux-phy@lists.infradead.org https://lists.infradead.org/mailman/listinfo/linux-phy