From patchwork Mon Aug 8 13:00:26 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Kahola, Mika" X-Patchwork-Id: 9268285 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id BC05F60754 for ; Mon, 8 Aug 2016 13:01:20 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id AE1532838D for ; Mon, 8 Aug 2016 13:01:20 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A19A8283ED; Mon, 8 Aug 2016 13:01:20 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 4427D2838D for ; Mon, 8 Aug 2016 13:01:19 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 7B9C16E2A0; Mon, 8 Aug 2016 13:01:19 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by gabe.freedesktop.org (Postfix) with ESMTP id 4E5726E29E; Mon, 8 Aug 2016 13:01:18 +0000 (UTC) Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga101.fm.intel.com with ESMTP; 08 Aug 2016 06:01:18 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos; i="5.28,490,1464678000"; d="scan'208"; a="1010443114" Received: from sorvi.fi.intel.com ([10.237.72.167]) by orsmga001.jf.intel.com with ESMTP; 08 Aug 2016 06:00:33 -0700 From: Mika Kahola To: dri-devel@lists.freedesktop.org Date: Mon, 8 Aug 2016 16:00:26 +0300 Message-Id: <1470661230-15988-2-git-send-email-mika.kahola@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1470661230-15988-1-git-send-email-mika.kahola@intel.com> References: <1470661230-15988-1-git-send-email-mika.kahola@intel.com> Cc: daniel.vetter@ffwll.ch, intel-gfx@lists.freedesktop.org Subject: [Intel-gfx] [PATCH v7 1/5] drm: Read DP branch device HW revision X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" X-Virus-Scanned: ClamAV using ClamSMTP HW revision is mandatory field for DisplayPort branch devices. This is defined in DPCD register field 0x509. v2: move drm_dp_ds_revision structure to be part of drm_dp_link structure (Daniel) Signed-off-by: Mika Kahola --- drivers/gpu/drm/drm_dp_helper.c | 27 +++++++++++++++++++++++++++ drivers/gpu/drm/i915/intel_drv.h | 1 + include/drm/drm_dp_helper.h | 9 +++++++++ 3 files changed, 37 insertions(+) diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c index 75b2873..5fecdc1 100644 --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -514,6 +514,33 @@ int drm_dp_downstream_max_bpc(const u8 dpcd[DP_RECEIVER_CAP_SIZE], EXPORT_SYMBOL(drm_dp_downstream_max_bpc); /** + * drm_dp_downstream_hw_rev() - read DP branch device HW revision + * @aux: DisplayPort AUX channel + * + * Returns 0 on succes or negative error code on failure + */ +int drm_dp_downstream_hw_rev(const u8 dpcd[DP_RECEIVER_CAP_SIZE], + struct drm_dp_aux *aux, struct drm_dp_link *link) +{ + uint8_t tmp; + int err; + + if (!(dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT)) + return -EINVAL; + + err = drm_dp_dpcd_read(aux, DP_BRANCH_HW_REV, &tmp, 1); + + if (err < 0) + return err; + + link->ds_hw_rev.major = (tmp & 0xf0) >> 4; + link->ds_hw_rev.minor = tmp & 0xf; + + return 0; +} +EXPORT_SYMBOL(drm_dp_downstream_hw_rev); + +/** * drm_dp_downstream_id() - identify branch device * @aux: DisplayPort AUX channel * diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index e74d851..a6eccf5 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -865,6 +865,7 @@ struct intel_dp { uint8_t num_sink_rates; int sink_rates[DP_MAX_SUPPORTED_RATES]; struct drm_dp_aux aux; + struct drm_dp_link link; uint8_t train_set[4]; int panel_power_up_delay; int panel_power_down_delay; diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index 8e1fe58..1127948 100644 --- a/include/drm/drm_dp_helper.h +++ b/include/drm/drm_dp_helper.h @@ -446,6 +446,7 @@ #define DP_SINK_OUI 0x400 #define DP_BRANCH_OUI 0x500 #define DP_BRANCH_ID 0x503 +#define DP_BRANCH_HW_REV 0x509 #define DP_SET_POWER 0x600 # define DP_SET_POWER_D0 0x1 @@ -803,11 +804,17 @@ int drm_dp_dpcd_read_link_status(struct drm_dp_aux *aux, */ #define DP_LINK_CAP_ENHANCED_FRAMING (1 << 0) +struct drm_dp_ds_revision { + int major; + int minor; +}; + struct drm_dp_link { unsigned char revision; unsigned int rate; unsigned int num_lanes; unsigned long capabilities; + struct drm_dp_ds_revision ds_hw_rev; }; int drm_dp_link_probe(struct drm_dp_aux *aux, struct drm_dp_link *link); @@ -819,6 +826,8 @@ int drm_dp_downstream_max_clock(const u8 dpcd[DP_RECEIVER_CAP_SIZE], int drm_dp_downstream_max_bpc(const u8 dpcd[DP_RECEIVER_CAP_SIZE], const u8 port_cap[4]); int drm_dp_downstream_id(struct drm_dp_aux *aux, char id[6]); +int drm_dp_downstream_hw_rev(const u8 dpcd[DP_RECEIVER_CAP_SIZE], + struct drm_dp_aux *aux, struct drm_dp_link *link); void drm_dp_aux_init(struct drm_dp_aux *aux); int drm_dp_aux_register(struct drm_dp_aux *aux);