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 CC865C43334 for ; Wed, 8 Jun 2022 08:40:12 +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=7CU7KtOPS7YNz9KEH7s8FoTP1ekOTeanEzMek8tQC1o=; b=BX9sb/XH/2KsV1 xjxaB/3FuJ/TuUOYJH9rvqbRGU2v/WzUMJyKU7D4PByuVPsuRKAvyI+TwaUNRRSPvrRzM0eAeT2fn HIjuLYoEDecQ1AG7EGEhkJTqTpImdtD6l2qvTeY84HmLW4eqtcHwmRFLnJJaYNtNjCAE31sHtiQhH SGgCWTl/Lhboep1B24aKfiQP5eQ3v0HfoS2gpNIZOg2UX1cwvDj441kunKqJ7tCl8i3njHoz7vRl1 VDy5iu2kQlnVQdec5Ig69B9dXIbN5DLvgVFPg94kS/qJ2Xy8fp4N2/CZANl2vuOFybla3kmebfzJI Ly5zo+D8yzH/wVIWeSqA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nyrEa-00C1z2-4g; Wed, 08 Jun 2022 08:40:12 +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 1nyrBR-00C0Wl-Le; Wed, 08 Jun 2022 08:36:59 +0000 X-UUID: cc1dabdde97545128a85bde79139003c-20220608 X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.5,REQID:e7a82e3c-7c4b-4bf9-a5fa-60bfd0eadb2a,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:8d889f7e-c8dc-403a-96e8-6237210dceee,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: cc1dabdde97545128a85bde79139003c-20220608 Received: from mtkcas66.mediatek.inc [(172.29.193.44)] by mailgw02.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 1480211359; Wed, 08 Jun 2022 01:36:47 -0700 Received: from mtkmbs11n1.mediatek.inc (172.21.101.185) by MTKMBS62N1.mediatek.inc (172.29.193.41) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 8 Jun 2022 01:30:47 -0700 Received: from mtkmbs11n1.mediatek.inc (172.21.101.185) by mtkmbs11n1.mediatek.inc (172.21.101.185) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.792.3; Wed, 8 Jun 2022 16:30:46 +0800 Received: from mtksdccf07 (172.21.84.99) by mtkmbs11n1.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.792.3 via Frontend Transport; Wed, 8 Jun 2022 16:30:46 +0800 Message-ID: <651e6b993562d53c893d0325d33fa137e98ab596.camel@mediatek.com> Subject: Re: [PATCH v10 18/21] drm/mediatek: Add mt8195 Embedded DisplayPort driver From: CK Hu To: Rex-BC Chen , 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: Wed, 8 Jun 2022 16:30:45 +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-20220608_013657_813855_D492800B X-CRM114-Status: GOOD ( 23.36 ) 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, Rex: 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 bool mtk_dp_parse_capabilities(struct mtk_dp *mtk_dp) > +{ > + u8 buf[DP_RECEIVER_CAP_SIZE] = {}; > + u8 val; > + struct mtk_dp_train_info *train_info = &mtk_dp->train_info; > + > + if (!mtk_dp_plug_state(mtk_dp)) > + return false; > + > + drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, > DP_SET_POWER_D0); > + /* Wait for power on */ > + usleep_range(2000, 5000); > + > + drm_dp_read_dpcd_caps(&mtk_dp->aux, buf); > + > + memcpy(mtk_dp->rx_cap, buf, min(sizeof(mtk_dp->rx_cap), > sizeof(buf))); sizeof(mtk_dp->rx_cap) is identical to sizeof(buf), so drm_dp_read_dpcd_caps(&mtk_dp->aux, mtk_dp->rx_cap); > + mtk_dp->rx_cap[DP_TRAINING_AUX_RD_INTERVAL] &= > DP_TRAINING_AUX_RD_MASK; > + > + train_info->link_rate = > + min_t(int, mtk_dp->max_linkrate, buf[mtk_dp- > >max_linkrate]); > + train_info->lane_count = > + min_t(int, mtk_dp->max_lanes, > drm_dp_max_lane_count(buf)); > + > + train_info->tps3 = drm_dp_tps3_supported(buf); > + train_info->tps4 = drm_dp_tps4_supported(buf); > + > + train_info->sink_ssc = > + !!(buf[DP_MAX_DOWNSPREAD] & DP_MAX_DOWNSPREAD_0_5); > + > + train_info->sink_ssc = false; What does these two statement do? Regards, CK > + > + drm_dp_dpcd_readb(&mtk_dp->aux, DP_MSTM_CAP, &val); > + if (val & DP_MST_CAP) { > + /* Clear DP_DEVICE_SERVICE_IRQ_VECTOR_ESI0 */ > + drm_dp_dpcd_readb(&mtk_dp->aux, > + DP_DEVICE_SERVICE_IRQ_VECTOR_ESI0, > &val); > + if (val) > + drm_dp_dpcd_writeb(&mtk_dp->aux, > + DP_DEVICE_SERVICE_IRQ_VECTOR > _ESI0, > + val); > + } > + > + return true; > +} > + -- linux-phy mailing list linux-phy@lists.infradead.org https://lists.infradead.org/mailman/listinfo/linux-phy