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 29CC2C433EF for ; Mon, 20 Jun 2022 03:46:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238078AbiFTDq1 (ORCPT ); Sun, 19 Jun 2022 23:46:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38608 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238059AbiFTDqF (ORCPT ); Sun, 19 Jun 2022 23:46:05 -0400 Received: from mailgw02.mediatek.com (unknown [210.61.82.184]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6A7E2CE00; Sun, 19 Jun 2022 20:46:03 -0700 (PDT) X-UUID: fc1652a01c914f2cb6d935a29fea5c28-20220620 X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.6,REQID:3f9de25c-c23a-405d-a658-84380fa17625,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:b14ad71,CLOUDID:d9be253d-9948-4b2a-a784-d8a6c1086106,C OID:IGNORED,Recheck:0,SF:nil,TC:nil,Content:0,EDM:-3,IP:nil,URL:0,File:nil ,QS:nil,BEC:nil,COL:0 X-UUID: fc1652a01c914f2cb6d935a29fea5c28-20220620 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 1087266528; Mon, 20 Jun 2022 11:45:59 +0800 Received: from mtkcas11.mediatek.inc (172.21.101.40) by mtkmbs10n1.mediatek.inc (172.21.101.34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.2.792.15; Mon, 20 Jun 2022 11:45:56 +0800 Received: from mtksdccf07 (172.21.84.99) by mtkcas11.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Mon, 20 Jun 2022 11:45:56 +0800 Message-ID: <602191e9a61687a8ed05b216d0faad0092b05168.camel@mediatek.com> Subject: Re: [PATCH v11 05/10] drm/mediatek: Add MT8195 Embedded DisplayPort driver From: CK Hu To: Bo-Chen Chen , , , , , , , , , , CC: , , , , , , , , , , , Date: Mon, 20 Jun 2022 11:45:56 +0800 In-Reply-To: <20220610105522.13449-6-rex-bc.chen@mediatek.com> References: <20220610105522.13449-1-rex-bc.chen@mediatek.com> <20220610105522.13449-6-rex-bc.chen@mediatek.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: linux-kernel@vger.kernel.org Hi, Rex: On Fri, 2022-06-10 at 18:55 +0800, Bo-Chen Chen wrote: > From: Markus Schneider-Pargmann > > This patch adds a embedded 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 > Jitao shi > > Signed-off-by: Markus Schneider-Pargmann > Signed-off-by: Guillaume Ranquet > [Bo-Chen: Cleanup the drivers and modify comments from reviewers] > Signed-off-by: Bo-Chen Chen > --- [snip] > + > +static void mtk_dp_poweroff(struct mtk_dp *mtk_dp) > +{ > + mutex_lock(&mtk_dp->dp_lock); > + > + mtk_dp_hwirq_enable(mtk_dp, false); > + mtk_dp_power_disable(mtk_dp); > + phy_exit(mtk_dp->phy); > + > + mutex_unlock(&mtk_dp->dp_lock); > +} > + > +static int mtk_dp_poweron(struct mtk_dp *mtk_dp) > +{ > + int ret = 0; > + > + mutex_lock(&mtk_dp->dp_lock); The dp_poweron/off is only called by bridge_attach/detach, and I think drm core would not call attach/detach concurrently, so this mutex is redundant. Remove it. Regards, CK > + > + ret = phy_init(mtk_dp->phy); > + if (ret) { > + dev_err(mtk_dp->dev, "Failed to initialize phy: %d\n", > ret); > + goto err_phy_init; > + } > + ret = mtk_dp_phy_configure(mtk_dp, MTK_DP_LINKRATE_RBR, 1); > + if (ret) { > + dev_err(mtk_dp->dev, "Failed to configure phy: %d\n", > ret); > + goto err_phy_config; > + } > + > + mtk_dp_init_port(mtk_dp); > + mtk_dp_power_enable(mtk_dp); > + > +err_phy_config: > + phy_exit(mtk_dp->phy); > +err_phy_init: > + mutex_unlock(&mtk_dp->dp_lock); > + return ret; > +}