From patchwork Mon Mar 30 19:40:32 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Russell King X-Patchwork-Id: 6127111 Return-Path: X-Original-To: patchwork-dri-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id EBD629F387 for ; Tue, 31 Mar 2015 02:25:40 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 0B6FE2045B for ; Tue, 31 Mar 2015 02:25:40 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id 16B0D20460 for ; Tue, 31 Mar 2015 02:25:39 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 998166E3D8; Mon, 30 Mar 2015 19:25:32 -0700 (PDT) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from pandora.arm.linux.org.uk (pandora.arm.linux.org.uk [78.32.30.218]) by gabe.freedesktop.org (Postfix) with ESMTP id 5D6456E625 for ; Mon, 30 Mar 2015 12:40:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=arm.linux.org.uk; s=pandora-2014; h=Date:Sender:Message-Id:Content-Type:Content-Transfer-Encoding:MIME-Version:Subject:Cc:To:From:References:In-Reply-To; bh=Z19eUEy1ulNXPtOaOhIjvIRi9ipVT03R92cVqG0pAlA=; b=g3sDufqTSReQiLLiz2V7BRO6j/rocnm6YJUqA+DvlUcPOV8P28Rh1yP7xhNil2EZqNS8jUEomIApd/uDn8tlRBl2Baf6VOd8ae1WGuCeaVo5psZiHcPIsDI+++11sKdYJWD/sV21GlyrN0/U0bFhcTzGOzZ8OhCNWlhGdH7J4K0=; Received: from e0022681537dd.dyn.arm.linux.org.uk ([2001:4d48:ad52:3201:222:68ff:fe15:37dd]:38558 helo=rmk-PC.arm.linux.org.uk) by pandora.arm.linux.org.uk with esmtpsa (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.82_1-5b7a7c0-XX) (envelope-from ) id 1YcfY6-0001Aj-VS; Mon, 30 Mar 2015 20:40:39 +0100 Received: from rmk by rmk-PC.arm.linux.org.uk with local (Exim 4.76) (envelope-from ) id 1YcfY0-0002vI-0F; Mon, 30 Mar 2015 20:40:32 +0100 In-Reply-To: <20150330193911.GM24899@n2100.arm.linux.org.uk> References: <20150330193911.GM24899@n2100.arm.linux.org.uk> From: Russell King To: alsa-devel@alsa-project.org, dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH RFC 07/11] drm/edid: add function to help find SADs MIME-Version: 1.0 Content-Disposition: inline Message-Id: Date: Mon, 30 Mar 2015 20:40:32 +0100 X-Mailman-Approved-At: Mon, 30 Mar 2015 19:25:31 -0700 Cc: Fabio Estevam , Mark Brown , Yakir Yang X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Spam-Status: No, score=-4.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_MED, T_DKIM_INVALID, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Add a function to find the start of the SADs in the ELD. This complements the helper to retrieve the SAD count. Signed-off-by: Russell King Reviewed-by: Jani Nikula --- include/drm/drm_edid.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h index 87d85e81d3a7..c44ad513e0f7 100644 --- a/include/drm/drm_edid.h +++ b/include/drm/drm_edid.h @@ -346,6 +346,25 @@ static inline int drm_eld_mnl(const uint8_t *eld) } /** + * drm_eld_sad - Get ELD SAD structures. + * @eld: pointer to an eld memory structure with sad_count set + */ +static inline const uint8_t *drm_eld_sad(const uint8_t *eld) +{ + unsigned int ver, mnl; + + ver = (eld[DRM_ELD_VER] & DRM_ELD_VER_MASK) >> DRM_ELD_VER_SHIFT; + if (ver != 2 && ver != 31) + return NULL; + + mnl = drm_eld_mnl(eld); + if (mnl > 16) + return NULL; + + return eld + DRM_ELD_CEA_SAD(mnl, 0); +} + +/** * drm_eld_sad_count - Get ELD SAD count. * @eld: pointer to an eld memory structure with sad_count set */