Message ID | 1532430824-23477-3-git-send-email-dkos@cadence.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show
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Tue, 24 Jul 2018 11:14:29 +0000 Received-SPF: SoftFail (protection.outlook.com: domain of transitioning cadence.com discourages use of 199.43.4.28 as permitted sender) Received: from rmmaillnx1.cadence.com (199.43.4.28) by DM3NAM05FT053.mail.protection.outlook.com (10.152.98.167) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id 15.20.1017.0 via Frontend Transport; Tue, 24 Jul 2018 11:14:27 +0000 Received: from maileu3.global.cadence.com (maileu3.cadence.com [10.160.88.99]) by rmmaillnx1.cadence.com (8.14.4/8.14.4) with ESMTP id w6OBELVY027537 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Tue, 24 Jul 2018 07:14:23 -0400 X-CrossPremisesHeadersFilteredBySendConnector: maileu3.global.cadence.com Received: from maileu3.global.cadence.com (10.160.88.99) by maileu3.global.cadence.com (10.160.88.99) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Tue, 24 Jul 2018 13:14:36 +0200 Received: from lvloginb.cadence.com (10.165.177.11) by maileu3.global.cadence.com (10.160.88.99) with Microsoft SMTP Server id 15.0.1367.3 via Frontend Transport; Tue, 24 Jul 2018 13:14:35 +0200 Received: from lvloginb.cadence.com (localhost [127.0.0.1]) by lvloginb.cadence.com (8.14.4/8.14.4) with ESMTP id w6OBEKsq024982; Tue, 24 Jul 2018 12:14:20 +0100 Received: (from dkos@localhost) by lvloginb.cadence.com (8.14.4/8.14.4/Submit) id w6OBEI3V024937; Tue, 24 Jul 2018 12:14:18 +0100 From: Damian Kos <dkos@cadence.com> To: David Airlie <airlied@linux.ie>, Rob Herring <robh+dt@kernel.org>, "Mark Rutland" <mark.rutland@arm.com>, Archit Taneja <architt@codeaurora.org>, Andrzej Hajda <a.hajda@samsung.com>, Laurent Pinchart <Laurent.pinchart@ideasonboard.com>, Gustavo Padovan <gustavo@padovan.org>, Maarten Lankhorst <maarten.lankhorst@linux.intel.com>, Sean Paul <seanpaul@chromium.org>, Sandy Huang <hjc@rock-chips.com>, =?utf-8?q?Heiko_St=C3=BCbner?= <heiko@sntech.de>, Damian Kos <dkos@cadence.com>, Quentin Schulz <quentin.schulz@bootlin.com>, <dri-devel@lists.freedesktop.org>, <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>, <linux-rockchip@lists.infradead.org> Subject: [PATCH v2 2/5] drm/dp: fix link probing for devices supporting DP 1.4+ Date: Tue, 24 Jul 2018 12:13:33 +0100 Message-ID: <1532430824-23477-3-git-send-email-dkos@cadence.com> X-Mailer: git-send-email 1.9.0 In-Reply-To: <1532430824-23477-1-git-send-email-dkos@cadence.com> References: <1532430824-23477-1-git-send-email-dkos@cadence.com> MIME-Version: 1.0 X-OrganizationHeadersPreserved: maileu3.global.cadence.com X-EOPAttributedMessage: 0 X-Forefront-Antispam-Report: CIP:199.43.4.28; 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drm: add support for Cadence MHDP DPI/DP bridge.
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diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c index 0cccbcb2d03e..86a070269c87 100644 --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -370,10 +370,38 @@ int drm_dp_link_probe(struct drm_dp_aux *aux, struct drm_dp_link *link) { u8 values[3]; int err; + unsigned int addr; memset(link, 0, sizeof(*link)); - err = drm_dp_dpcd_read(aux, DP_DPCD_REV, values, sizeof(values)); + /* + * DP 1.4 introduced a DP_EXTENDED_RCVR_CAPA_FIELD_PRESENT bit in + * DP_TRAINING_AUX_RD_INTERVAL register. If set, DPCD registers from + * DP_DPCD_REV to DP_ADAPTER_CAP should be retrieved starting from + * DP_DPCD_REV_EXTENDED. All registers are copied except DP_DPCD_REV, + * DP_MAX_LINK_RATE and DP_DOWNSTREAMPORT_PRESENT which represent the + * "true capabilities" of DPRX device. + * + * Original DP_DPCD_REV, DP_MAX_LINK_RATE and DP_DOWNSTREAMPORT_PRESENT + * might falsely return lower capabilities to "avoid interoperability + * issues with some of the existing DP Source devices that malfunction + * when they discover the higher capabilities within those three + * registers.". + * + * Before DP 1.4, DP_EXTENDED_RCVR_CAPA_FIELD_PRESENT bit was reserved + * and read 0 so it's safe to check against it even if DP revision is + * <1.4 + */ + err = drm_dp_dpcd_readb(aux, DP_TRAINING_AUX_RD_INTERVAL, values); + if (err < 0) + return err; + + if (values[0] & DP_EXTENDED_RCVR_CAPA_FIELD_PRESENT) + addr = DP_DP13_DPCD_REV; + else + addr = DP_DPCD_REV; + + err = drm_dp_dpcd_read(aux, addr, values, sizeof(values)); if (err < 0) return err; diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index 05cc31b5db16..92800f2241b1 100644 --- a/include/drm/drm_dp_helper.h +++ b/include/drm/drm_dp_helper.h @@ -125,6 +125,7 @@ #define DP_TRAINING_AUX_RD_INTERVAL 0x00e /* XXX 1.2? */ # define DP_TRAINING_AUX_RD_MASK 0x7F /* XXX 1.2? */ +# define DP_EXTENDED_RCVR_CAPA_FIELD_PRESENT BIT(7) /* 1.3 */ #define DP_ADAPTER_CAP 0x00f /* 1.2 */ # define DP_FORCE_LOAD_SENSE_CAP (1 << 0)