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 E9C70C433EF for ; Fri, 15 Jul 2022 10:32:12 +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=lmvPJ7DoKuJyyPZ/bTNso7nZ4AadZROWOYBPHRnECYM=; b=4qm+m8uhqwLHNT JJ5azpZv76VzaQe++z5O7Q5Lwh/4NRYk4XWj9K5Yivf9eG5KJcbECKfr8s7v21RBeNGCXOKNCKSWY a2xZcBmCU7TA2bxdM7TfjgB3TqMgH64NOs48rnY43qKROoxRdR9LwqEzegKgvtHJVlzvwn2s3/7sO 648vem0XG0i4cG9NCbPGgHA7Y5zRMbfzP2XBmrwqU1e8/qlsRHSv9bpqXtUA8mlbgKWXa53oLnryB Bg9cZUsg0EhpCUWbw/ELzz1quOVyd9FSQ5NimIfmTnxIZrkv0FV8XlKhSQ6toM5G22OAkkhA0YXnq 6hMZsBC8/ib/vB2W0tVg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oCIbK-006MAd-7L; Fri, 15 Jul 2022 10:31:14 +0000 Received: from mailgw02.mediatek.com ([216.200.240.185]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oCIbF-006M8E-Kp; Fri, 15 Jul 2022 10:31:11 +0000 X-UUID: 0bae5fdafc904c50b1e66d94510dcb5f-20220715 X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.8,REQID:6dd32aa6-3b8f-4d86-8fc3-77345c28213c,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:0f94e32,CLOUDID:c8f26564-0b3f-4b2c-b3a6-ed5c044366a0,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: 0bae5fdafc904c50b1e66d94510dcb5f-20220715 Received: from mtkmbs11n1.mediatek.inc [(172.21.101.185)] by mailgw02.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 2009468603; Fri, 15 Jul 2022 03:28:17 -0700 Received: from mtkmbs11n2.mediatek.inc (172.21.101.187) by mtkmbs11n2.mediatek.inc (172.21.101.187) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.792.3; Fri, 15 Jul 2022 17:37:42 +0800 Received: from mtksdccf07 (172.21.84.99) by mtkmbs11n2.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.792.3 via Frontend Transport; Fri, 15 Jul 2022 17:37:42 +0800 Message-ID: Subject: Re: [PATCH v14 05/10] drm/mediatek: Add MT8195 Embedded DisplayPort driver From: CK Hu To: Bo-Chen Chen , , , , , , , , , , CC: , , , , , , , , , , , , Date: Fri, 15 Jul 2022 17:37:42 +0800 In-Reply-To: <20220712111223.13080-6-rex-bc.chen@mediatek.com> References: <20220712111223.13080-1-rex-bc.chen@mediatek.com> <20220712111223.13080-6-rex-bc.chen@mediatek.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-20220715_033109_732958_FA4C92A8 X-CRM114-Status: GOOD ( 19.97 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi, Bo-Chen: On Tue, 2022-07-12 at 19:12 +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 > Signed-off-by: Bo-Chen Chen > --- [snip] > + > +static enum drm_mode_status > +mtk_dp_bridge_mode_valid(struct drm_bridge *bridge, > + const struct drm_display_info *info, > + const struct drm_display_mode *mode) > +{ > + struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge); > + u32 rx_linkrate = (u32)mtk_dp->train_info.link_rate * 27000; > + u32 bpp = info->color_formats & DRM_COLOR_FORMAT_YCBCR422 ? 16 > : 24; > + > + if (rx_linkrate * mtk_dp->train_info.lane_count < mode->clock * > bpp / 8) > + return MODE_CLOCK_HIGH; > + > + if (mode->clock > 600000) > + return MODE_CLOCK_HIGH; > + > + if ((mode->clock * 1000) / (mode->htotal * mode->vtotal) > > + MTK_VDOSYS1_MAX_FRAMERATE) Why limit frame rate to 60fps? If the resolution is small enough, why not support higher fps? Regards, CK > + return MODE_CLOCK_HIGH; > + > + return MODE_OK; > +} > + _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel