From patchwork Mon Jun 6 13:29:04 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mika Kahola X-Patchwork-Id: 9158151 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 A4CC860572 for ; Mon, 6 Jun 2016 13:29:56 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 97DCC2821F for ; Mon, 6 Jun 2016 13:29:56 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8CB112824A; Mon, 6 Jun 2016 13:29:56 +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]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2091C28210 for ; Mon, 6 Jun 2016 13:29:56 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 85D5F6E50C; Mon, 6 Jun 2016 13:29:54 +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 2B2BB6E50A; Mon, 6 Jun 2016 13:29:20 +0000 (UTC) Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga101.fm.intel.com with ESMTP; 06 Jun 2016 06:29:19 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.26,427,1459839600"; d="scan'208";a="969814824" Received: from sorvi.fi.intel.com ([10.237.72.50]) by orsmga001.jf.intel.com with ESMTP; 06 Jun 2016 06:29:19 -0700 From: Mika Kahola To: dri-devel@lists.freedesktop.org Date: Mon, 6 Jun 2016 16:29:04 +0300 Message-Id: <1465219753-3737-3-git-send-email-mika.kahola@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1465219753-3737-1-git-send-email-mika.kahola@intel.com> References: <1465219753-3737-1-git-send-email-mika.kahola@intel.com> Cc: daniel.vetter@ffwll.ch, intel-gfx@lists.freedesktop.org Subject: [Intel-gfx] [PATCH v4 02/11] drm: Read DP downstream port capabilities 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 Read DisplayPort downstream port capabilities. Depending on the DP port the capabilities are defined in length of 1 byte or 4 bytes depending if the detailed capability information is available. Signed-off-by: Mika Kahola --- drivers/gpu/drm/drm_dp_helper.c | 27 +++++++++++++++++++++++++++ include/drm/drm_dp_helper.h | 3 +++ 2 files changed, 30 insertions(+) diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c index eeaf5a7..c4149fd 100644 --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -438,6 +438,33 @@ int drm_dp_link_configure(struct drm_dp_aux *aux, struct drm_dp_link *link) } EXPORT_SYMBOL(drm_dp_link_configure); +/** + * drm_dp_downstream_port_cap() - read downstream port capabilities + * @dpcd: DisplayPort configuration data + * @port_cap: port capabilities + * + * returns size of the port capabilites + */ +int drm_dp_downstream_port_cap(struct drm_dp_aux *aux, + const u8 dpcd[DP_RECEIVER_CAP_SIZE], + u8 port_cap[4]) +{ + int size; + bool detailed_cap_info = dpcd[DP_DOWNSTREAMPORT_PRESENT] & + DP_DETAILED_CAP_INFO_AVAILABLE; + + if (detailed_cap_info) { + size = 4; + drm_dp_dpcd_read(aux, DP_DOWNSTREAM_PORT_0, port_cap, size); + } else { + size = 1; + drm_dp_dpcd_read(aux, DP_DOWNSTREAM_PORT_0, &port_cap[0], size); + } + + return size; +} +EXPORT_SYMBOL(drm_dp_downstream_port_cap); + /* * I2C-over-AUX implementation */ diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index e384c7f..db8d3d47 100644 --- a/include/drm/drm_dp_helper.h +++ b/include/drm/drm_dp_helper.h @@ -806,6 +806,9 @@ int drm_dp_link_probe(struct drm_dp_aux *aux, struct drm_dp_link *link); int drm_dp_link_power_up(struct drm_dp_aux *aux, struct drm_dp_link *link); int drm_dp_link_power_down(struct drm_dp_aux *aux, struct drm_dp_link *link); int drm_dp_link_configure(struct drm_dp_aux *aux, struct drm_dp_link *link); +int drm_dp_downstream_port_cap(struct drm_dp_aux *aux, + const u8 dpcd[DP_RECEIVER_CAP_SIZE], + u8 port_cap[4]); int drm_dp_aux_register(struct drm_dp_aux *aux); void drm_dp_aux_unregister(struct drm_dp_aux *aux);