From patchwork Thu Apr 7 09:14:38 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jani Nikula X-Patchwork-Id: 12804894 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 CBEE1C433FE for ; Thu, 7 Apr 2022 09:15:54 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 7A51910E936; Thu, 7 Apr 2022 09:15:53 +0000 (UTC) Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by gabe.freedesktop.org (Postfix) with ESMTPS id 5F62910E90C; Thu, 7 Apr 2022 09:15:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1649322952; x=1680858952; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=GDCocADPGy9W8ErEvCBSDhfHLZTsKfBFIsXsxTXRCO0=; b=gx1dGRuFGGvqVvUOFNmchzBFopBd2tI0xURlfgmS0VO3kDxd6zjVYclc ISnGDuJxil0fdjc3ikhsz4r2DPQw4RrSHezG08Kt8g90d9PMJwuT9SoIx BsdF/NzWrabkVTgl9RrZV8l0VIFLCOg4APoKOHQKd+eYMRm9Jf0+XNmyN cui489VtjYkoBxFXurA9W0Y6HHKkKW/O9Psuf6cgHpaG624aAh0k3aIlS H6m7IxIA17ngkL5iULZVFOb6NGOJITNAl+/qkcDO8kz+GEVMXUqJwgSAj e8s/rFVXaLZIn3+6L8mvmkjqvAeVdIH63H6cT2gs5zo6f4HwLtIiX8DSO Q==; X-IronPort-AV: E=McAfee;i="6200,9189,10309"; a="261450505" X-IronPort-AV: E=Sophos;i="5.90,241,1643702400"; d="scan'208";a="261450505" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Apr 2022 02:15:51 -0700 X-IronPort-AV: E=Sophos;i="5.90,241,1643702400"; d="scan'208";a="570970751" Received: from kgibala-mobl.ger.corp.intel.com (HELO localhost) ([10.249.142.48]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Apr 2022 02:15:48 -0700 From: Jani Nikula To: dri-devel@lists.freedesktop.org Subject: [PATCH 12/12] drm/edid: add EDID block count and size helpers Date: Thu, 7 Apr 2022 12:14:38 +0300 Message-Id: <1626a18cffe0ffb47cb2994739f822dd2023435e.1649322799.git.jani.nikula@intel.com> 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 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: jani.nikula@intel.com, intel-gfx@lists.freedesktop.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Add some helpers to figure out the EDID extension block count, block count, size, pointers to blocks. Unfortunately, we'll need to cast away the const in a few places where we actually need to access the data. Signed-off-by: Jani Nikula --- drivers/gpu/drm/drm_edid.c | 78 +++++++++++++++++++++++++++----------- 1 file changed, 56 insertions(+), 22 deletions(-) diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index 90615e30eaf5..53a57ff5f4a1 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -1568,6 +1568,38 @@ static const struct drm_display_mode edid_4k_modes[] = { /*** DDC fetch and block validation ***/ +static int edid_extension_block_count(const struct edid *edid) +{ + return edid->extensions; +} + +static int edid_block_count(const struct edid *edid) +{ + return edid_extension_block_count(edid) + 1; +} + +static int edid_size_by_blocks(int num_blocks) +{ + return num_blocks * EDID_LENGTH; +} + +static int edid_size(const struct edid *edid) +{ + return edid_size_by_blocks(edid_block_count(edid)); +} + +static const void *edid_block_data(const struct edid *edid, int index) +{ + BUILD_BUG_ON(sizeof(*edid) != EDID_LENGTH); + + return edid + index; +} + +static const void *edid_extension_block_data(const struct edid *edid, int index) +{ + return edid_block_data(edid, index + 1); +} + static const u8 edid_header[] = { 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 }; @@ -1654,8 +1686,8 @@ bool drm_edid_are_equal(const struct edid *edid1, const struct edid *edid2) return false; if (edid1) { - edid1_len = EDID_LENGTH * (1 + edid1->extensions); - edid2_len = EDID_LENGTH * (1 + edid2->extensions); + edid1_len = edid_size(edid1); + edid2_len = edid_size(edid2); if (edid1_len != edid2_len) return false; @@ -1865,14 +1897,16 @@ EXPORT_SYMBOL(drm_edid_block_valid); bool drm_edid_is_valid(struct edid *edid) { int i; - u8 *raw = (u8 *)edid; if (!edid) return false; - for (i = 0; i <= edid->extensions; i++) - if (!drm_edid_block_valid(raw + i * EDID_LENGTH, i, true, NULL)) + for (i = 0; i < edid_block_count(edid); i++) { + void *block = (void *)edid_block_data(edid, i); + + if (!drm_edid_block_valid(block, i, true, NULL)) return false; + } return true; } @@ -1885,13 +1919,13 @@ static struct edid *edid_filter_invalid_blocks(const struct edid *edid, int valid_extensions = edid->extensions - invalid_blocks; int i; - new = kmalloc_array(valid_extensions + 1, EDID_LENGTH, GFP_KERNEL); + new = kmalloc(edid_size_by_blocks(valid_extensions + 1), GFP_KERNEL); if (!new) goto out; dest_block = new; - for (i = 0; i <= edid->extensions; i++) { - const void *block = edid + i; + for (i = 0; i < edid_block_count(edid); i++) { + const void *block = edid_block_data(edid, i); if (edid_block_valid(block, i == 0)) memcpy(dest_block++, block, EDID_LENGTH); @@ -2101,7 +2135,7 @@ struct edid *drm_do_get_edid(struct drm_connector *connector, void *context) { enum edid_block_status status; - int j, invalid_blocks = 0; + int i, invalid_blocks = 0; struct edid *edid, *new; edid = drm_get_override_edid(connector); @@ -2133,18 +2167,18 @@ struct edid *drm_do_get_edid(struct drm_connector *connector, goto fail; } - if (edid->extensions == 0) + if (!edid_extension_block_count(edid) == 0) goto ok; - new = krealloc(edid, (edid->extensions + 1) * EDID_LENGTH, GFP_KERNEL); + new = krealloc(edid, edid_size(edid), GFP_KERNEL); if (!new) goto fail; edid = new; - for (j = 1; j <= edid->extensions; j++) { - void *block = edid + j; + for (i = 1; i < edid_block_count(edid); i++) { + void *block = (void *)edid_block_data(edid, i); - status = edid_block_read(block, j, read_block, context); + status = edid_block_read(block, i, read_block, context); edid_block_status_print(status, block, j); @@ -2156,7 +2190,7 @@ struct edid *drm_do_get_edid(struct drm_connector *connector, } if (invalid_blocks) { - connector_bad_edid(connector, edid, edid->extensions + 1); + connector_bad_edid(connector, edid, edid_block_count(edid)); edid = edid_filter_invalid_blocks(edid, invalid_blocks); } @@ -2321,7 +2355,7 @@ EXPORT_SYMBOL(drm_get_edid_switcheroo); */ struct edid *drm_edid_duplicate(const struct edid *edid) { - return kmemdup(edid, (edid->extensions + 1) * EDID_LENGTH, GFP_KERNEL); + return kmemdup(edid, edid_size(edid), GFP_KERNEL); } EXPORT_SYMBOL(drm_edid_duplicate); @@ -2505,8 +2539,8 @@ drm_for_each_detailed_block(const struct edid *edid, detailed_cb *cb, void *clos for (i = 0; i < EDID_DETAILED_TIMINGS; i++) cb(&(edid->detailed_timings[i]), closure); - for (i = 1; i <= edid->extensions; i++) { - const u8 *ext = (const u8 *)edid + (i * EDID_LENGTH); + for (i = 0; i < edid_extension_block_count(edid); i++) { + const u8 *ext = edid_extension_block_data(edid, i); switch (*ext) { case CEA_EXT: @@ -3476,17 +3510,17 @@ const u8 *drm_find_edid_extension(const struct edid *edid, int i; /* No EDID or EDID extensions */ - if (edid == NULL || edid->extensions == 0) + if (!edid || !edid_extension_block_count(edid)) return NULL; /* Find CEA extension */ - for (i = *ext_index; i < edid->extensions; i++) { - edid_ext = (const u8 *)edid + EDID_LENGTH * (i + 1); + for (i = *ext_index; i < edid_extension_block_count(edid); i++) { + edid_ext = edid_extension_block_data(edid, i); if (edid_block_tag(edid_ext) == ext_id) break; } - if (i >= edid->extensions) + if (i >= edid_extension_block_count(edid)) return NULL; *ext_index = i + 1;