From owner-svn-src-head@FreeBSD.ORG Sun Aug 25 09:46:04 2013 Return-Path: Delivered-To: svn-src-head@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTP id 4F987A4C; Sun, 25 Aug 2013 09:46:04 +0000 (UTC) (envelope-from dumbbell@FreeBSD.org) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:1900:2254:2068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id 238DF241E; Sun, 25 Aug 2013 09:46:04 +0000 (UTC) Received: from svn.freebsd.org ([127.0.1.70]) by svn.freebsd.org (8.14.7/8.14.7) with ESMTP id r7P9k42d081661; Sun, 25 Aug 2013 09:46:04 GMT (envelope-from dumbbell@svn.freebsd.org) Received: (from dumbbell@localhost) by svn.freebsd.org (8.14.7/8.14.5/Submit) id r7P9k3iQ081660; Sun, 25 Aug 2013 09:46:03 GMT (envelope-from dumbbell@svn.freebsd.org) Message-Id: <201308250946.r7P9k3iQ081660@svn.freebsd.org> From: Jean-Sebastien Pedron Date: Sun, 25 Aug 2013 09:46:03 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r254833 - head/sys/dev/drm2 X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 25 Aug 2013 09:46:04 -0000 Author: dumbbell Date: Sun Aug 25 09:46:03 2013 New Revision: 254833 URL: http://svnweb.freebsd.org/changeset/base/254833 Log: drm: Import Linux commit cd004b3f4cd4169815c82bf9e424fda06978898a Author: Shirish S Date: Thu Aug 30 07:04:06 2012 +0000 drm: edid: add support for E-DDC The current logic for probing ddc is limited to 2 blocks (256 bytes), this patch adds support for the 4 block (512) data. To do this, a single 8-bit segment index is passed to the display via the I2C address 30h. Data from the selected segment is then immediately read via the regular DDC2 address using a repeated I2C 'START' signal. Signed-off-by: Shirish S Reviewed-by: Jean Delvare Reviewed-by: Daniel Vetter Reviewed-by: Ville Syrjala Signed-off-by: Dave Airlie Modified: head/sys/dev/drm2/drm_edid.c Modified: head/sys/dev/drm2/drm_edid.c ============================================================================== --- head/sys/dev/drm2/drm_edid.c Sun Aug 25 09:45:26 2013 (r254832) +++ head/sys/dev/drm2/drm_edid.c Sun Aug 25 09:46:03 2013 (r254833) @@ -253,6 +253,8 @@ drm_do_probe_ddc_edid(device_t adapter, int block, int len) { unsigned char start = block * EDID_LENGTH; + unsigned char segment = block >> 1; + unsigned char xfers = segment ? 3 : 2; int ret, retries = 5; /* The core i2c driver will automatically retry the transfer if the @@ -264,6 +266,11 @@ drm_do_probe_ddc_edid(device_t adapter, do { struct iic_msg msgs[] = { { + .slave = DDC_SEGMENT_ADDR << 1, + .flags = 0, + .len = 1, + .buf = &segment, + }, { .slave = DDC_ADDR << 1, .flags = IIC_M_WR, .len = 1, @@ -275,7 +282,13 @@ drm_do_probe_ddc_edid(device_t adapter, .buf = buf, } }; - ret = iicbus_transfer(adapter, msgs, 2); + + /* + * Avoid sending the segment addr to not upset non-compliant ddc + * monitors. + */ + ret = iicbus_transfer(adapter, &msgs[3 - xfers], xfers); + if (ret != 0) DRM_DEBUG_KMS("iicbus_transfer countdown %d error %d\n", retries, ret);