From patchwork Tue Mar 22 21:40:33 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jani Nikula X-Patchwork-Id: 12789154 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5E13CC433EF for ; Tue, 22 Mar 2022 21:41:23 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 4C76510E578; Tue, 22 Mar 2022 21:41:22 +0000 (UTC) Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by gabe.freedesktop.org (Postfix) with ESMTPS id 12DE410E578; Tue, 22 Mar 2022 21:41:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1647985280; x=1679521280; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=5z03e66q5DsjN2ki2aosqJHkbi24NfxJqhJj0ZJRMjU=; b=R2OBc0jZyvVDlZKabdp3mLNSa2KRW1z1LIevTeHuVTmia/2n2+RuBHIX vQ6x2V2Q7yo1ITtgQRETRtnhurFgHkRb+VtN+pQ8xHvWz3MlAZ+clS7d/ lklYoYJj+tw+yp5wwfCFam1hvh367VstLStXy2N9kEm0iOQktAn7GZmgU E/iR0ElKB5/Nl131kJythJP8Hmcl0LWO6oXHuXs04po8w/psI2ilIv1qp 1TzJI2EmkUjwwx4fO+oSpV7oITXSwduQFWoBSLej+jTZ9QXZWuxxQxf78 h+j5Nvefdtnyxp1RumisewM2ACcUz80ECqDNLXI4elQqvm9dXnFOR79Vf A==; X-IronPort-AV: E=McAfee;i="6200,9189,10294"; a="258145965" X-IronPort-AV: E=Sophos;i="5.90,202,1643702400"; d="scan'208";a="258145965" Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Mar 2022 14:41:19 -0700 X-IronPort-AV: E=Sophos;i="5.90,202,1643702400"; d="scan'208";a="649181959" Received: from sburacze-mobl1.ger.corp.intel.com (HELO localhost) ([10.252.58.237]) by orsmga004-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Mar 2022 14:41:17 -0700 From: Jani Nikula To: dri-devel@lists.freedesktop.org Date: Tue, 22 Mar 2022 23:40:33 +0200 Message-Id: X-Mailer: git-send-email 2.30.2 In-Reply-To: References: MIME-Version: 1.0 Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo Subject: [Intel-gfx] [RFC 04/19] drm/edid: add iterator for EDID base and extension blocks X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: jani.nikula@intel.com, intel-gfx@lists.freedesktop.org Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" Add an iterator abstraction for going through all the EDID blocks. Signed-off-by: Jani Nikula --- drivers/gpu/drm/drm_edid.c | 46 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index 6c188539493e..31d132fcd0ca 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -3348,6 +3348,52 @@ add_detailed_modes(struct drm_connector *connector, struct edid *edid, #define EDID_CEA_YCRCB422 (1 << 4) #define EDID_CEA_VCDB_QS (1 << 6) +/* + * EDID base and extension block iterator. + * + * struct drm_edid_iter iter; + * const u8 *block; + * + * drm_edid_iter_begin(edid, &iter); + * drm_edid_iter_for_each(block, &iter) { + * // do stuff with block + * } + * drm_edid_iter_end(&iter); + */ +struct drm_edid_iter { + const struct edid *edid; + + /* Current block index. */ + int index; +}; + +static void drm_edid_iter_begin(const struct edid *edid, + struct drm_edid_iter *iter) +{ + memset(iter, 0, sizeof(*iter)); + + iter->edid = edid; +} + +static const void *__drm_edid_iter_next(struct drm_edid_iter *iter) +{ + if (!iter->edid) + return NULL; + + if (iter->index > drm_edid_extension_block_count(iter->edid)) + return NULL; + + return (const u8 *)iter->edid + EDID_LENGTH * iter->index++; +} + +#define drm_edid_iter_for_each(__block, __iter) \ + while (((__block) = __drm_edid_iter_next(__iter))) + +static void drm_edid_iter_end(struct drm_edid_iter *iter) +{ + memset(iter, 0, sizeof(*iter)); +} + /* * Search EDID for CEA extension block. */