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 63D2BC433EF for ; Tue, 21 Jun 2022 08:13:24 +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=Nb8n5vUTr8o37jb3EckX1Z1zbjpoMoo5Rx4tLIEDzKE=; b=q0RZMl1ogI1k6L ZnBl/q8mbHT4Rg1rIc4bLQ3caMIXl8UjmV73FYLA91Jp0IJ2zrnw2w/2FBv3qURVyca5Ad2eULQhe 9EkDUSSdH2dcy4NBeIdz/bToksUmkTYhCLsu8gXRSjbkZ2sPKiqoqqyhGlB56948vP3UhoDCLK8AC rWhlWXwxVHyBZSH9PcAZUSGsGwBPn4itErvOVB6eEzvGzDibNareZnYZuAdJeae32TXhqY6K0EqeK rli9EUS9dihibLNDAmAsOOwt6zmk8zySM4gUV3GLQuxUG92tV+nDZdOqqHyplWK1coGc96YXyJlNX aW8qFUu0qVMqkZTByOMA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1o3Yzm-004JQ2-BJ; Tue, 21 Jun 2022 08:12:22 +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 1o3Yzj-004JOr-0z; Tue, 21 Jun 2022 08:12:20 +0000 X-UUID: 99dcebf0116a4390bbf64e9cca3e5fd0-20220621 X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.6,REQID:eca28cdd-2cc4-4424-98eb-0d4f58882dd9,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:a4c1a02d-1756-4fa3-be7f-474a6e4be921,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: 99dcebf0116a4390bbf64e9cca3e5fd0-20220621 Received: from mtkcas66.mediatek.inc [(172.29.193.44)] by mailgw01.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 979577464; Tue, 21 Jun 2022 01:12:12 -0700 Received: from mtkmbs10n1.mediatek.inc (172.21.101.34) by MTKMBS62N1.mediatek.inc (172.29.193.41) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Tue, 21 Jun 2022 01:05:10 -0700 Received: from mtkmbs11n1.mediatek.inc (172.21.101.186) by mtkmbs10n1.mediatek.inc (172.21.101.34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.792.15; Tue, 21 Jun 2022 16:05:09 +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; Tue, 21 Jun 2022 16:05:09 +0800 Message-ID: Subject: Re: [PATCH v11 05/10] drm/mediatek: Add MT8195 Embedded DisplayPort driver From: CK Hu To: Bo-Chen Chen , , , , , , , , , , CC: , , , , , , , , , , , Date: Tue, 21 Jun 2022 16:05:08 +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> 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-20220621_011219_083920_17298A7B X-CRM114-Status: GOOD ( 23.17 ) 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 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 int mtk_dp_parse_capabilities(struct mtk_dp *mtk_dp) > +{ > + u8 val; > + struct mtk_dp_train_info *train_info = &mtk_dp->train_info; > + > + drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, > DP_SET_POWER_D0); > + usleep_range(2000, 5000); > + > + 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; You never use mtk_dp->rx_cap[DP_TRAINING_AUX_RD_INTERVAL], why do you modify it? > + > + train_info->link_rate = min_t(int, mtk_dp->max_linkrate, > + mtk_dp->rx_cap[mtk_dp- > >max_linkrate]); > + train_info->lane_count = min_t(int, mtk_dp->max_lanes, > + drm_dp_max_lane_count(mtk_dp- > >rx_cap)); > + > + train_info->tps3 = drm_dp_tps3_supported(mtk_dp->rx_cap); > + train_info->tps4 = drm_dp_tps4_supported(mtk_dp->rx_cap); > + > + train_info->sink_ssc = !!(mtk_dp->rx_cap[DP_MAX_DOWNSPREAD] & > + DP_MAX_DOWNSPREAD_0_5); > + train_info->sink_ssc = drm_dp_max_downspread(mtk_dp->rx_cap); Regards, CK > + train_info->sink_ssc = false; > + > + 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 0; > +} _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel