From mboxrd@z Thu Jan 1 00:00:00 1970 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 EBA4BC433EF for ; Wed, 23 Mar 2022 10:12:20 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 2559910E65C; Wed, 23 Mar 2022 10:12:20 +0000 (UTC) Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) by gabe.freedesktop.org (Postfix) with ESMTPS id 6885510E65C; Wed, 23 Mar 2022 10:12:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1648030338; x=1679566338; h=from:to:cc:subject:in-reply-to:references:date: message-id:mime-version; bh=4rSuxwZGT/Ny5zrbukTAmWBnBYxG9X0h5pQiCNwk47c=; b=gIPSatccgl8SPHtsY0Cc+5ZLXFE3jx114Nvqsht2xupqvH5EFe3osUiO 1DQu0INYbDgOnBahnyx5bLbN91Z2MBcAcd4PTlLPUpYVjiARkw3FE0Nb2 jXjh4M5wsxsa8ZdoITN/3s1bIedU9ADMPQcPRUvYqRqRPH37uX2MHRRAI wO6APS1q7EPkfBnCNaPVR4T2t9MWuROUzFBKa0lEL5GzdXLo9pGrT5+9B u/2JlF3qrvB+E/N9Ai4/SMHvDq66RW6DtvgfzAhq27oJ9Ojp/rc1Z2/VZ HW7DG9lKECiBAT4Km5ckFHOwUTYf04spf5LzSd6hK/jje7AE3QQssRNnp w==; X-IronPort-AV: E=McAfee;i="6200,9189,10294"; a="318783409" X-IronPort-AV: E=Sophos;i="5.90,203,1643702400"; d="scan'208";a="318783409" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Mar 2022 03:11:55 -0700 X-IronPort-AV: E=Sophos;i="5.90,203,1643702400"; d="scan'208";a="560832954" Received: from caliyanx-mobl.gar.corp.intel.com (HELO localhost) ([10.252.57.47]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Mar 2022 03:11:52 -0700 From: Jani Nikula To: Lee Shawn C , dri-devel@lists.freedesktop.org In-Reply-To: <20220317124202.14189-4-shawn.c.lee@intel.com> Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo References: <20220317124202.14189-1-shawn.c.lee@intel.com> <20220317124202.14189-4-shawn.c.lee@intel.com> Date: Wed, 23 Mar 2022 12:11:50 +0200 Message-ID: <8735j9j7vd.fsf@intel.com> MIME-Version: 1.0 Content-Type: text/plain Subject: Re: [Intel-gfx] [v8 3/5] drm/edid: read HF-EEODB ext block 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: cooper.chiou@intel.com, william.tseng@intel.com, intel-gfx@lists.freedesktop.org Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" On Thu, 17 Mar 2022, Lee Shawn C wrote: > According to HDMI 2.1 spec. > > "The HDMI Forum EDID Extension Override Data Block (HF-EEODB) > is utilized by Sink Devices to provide an alternate method to > indicate an EDID Extension Block count larger than 1, while > avoiding the need to present a VESA Block Map in the first > E-EDID Extension Block." > > It is a mandatory for HDMI 2.1 protocol compliance as well. > This patch help to know how many HF_EEODB blocks report by sink > and read allo HF_EEODB blocks back. It still just boggles my mind that they've implemented something like this. They cite avoiding the EDID Block Map as the rationale... but it's been optional since E-EDID structure v1.4, published in 2006. 15+ years ago. Can anyone tell me a sane reason for this? What does it provide that E-EDID 1.4 does not? Do they want to use E-EDID v1.3 with this? Why? BR, Jani. > > v2: support to find CEA block, check EEODB block format, and return > available block number in drm_edid_read_hf_eeodb_blk_count(). > > Cc: Jani Nikula > Cc: Ville Syrjala > Cc: Ankit Nautiyal > Cc: intel-gfx > Signed-off-by: Lee Shawn C > --- > drivers/gpu/drm/drm_connector.c | 8 +++- > drivers/gpu/drm/drm_edid.c | 71 +++++++++++++++++++++++++++++++-- > include/drm/drm_edid.h | 2 +- > 3 files changed, 74 insertions(+), 7 deletions(-) > > diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c > index a50c82bc2b2f..16011023c12e 100644 > --- a/drivers/gpu/drm/drm_connector.c > +++ b/drivers/gpu/drm/drm_connector.c > @@ -2129,7 +2129,7 @@ int drm_connector_update_edid_property(struct drm_connector *connector, > const struct edid *edid) > { > struct drm_device *dev = connector->dev; > - size_t size = 0; > + size_t size = 0, hf_eeodb_blk_count; > int ret; > const struct edid *old_edid; > > @@ -2137,8 +2137,12 @@ int drm_connector_update_edid_property(struct drm_connector *connector, > if (connector->override_edid) > return 0; > > - if (edid) > + if (edid) { > size = EDID_LENGTH * (1 + edid->extensions); > + hf_eeodb_blk_count = drm_edid_read_hf_eeodb_blk_count(edid); > + if (hf_eeodb_blk_count) > + size = EDID_LENGTH * (1 + hf_eeodb_blk_count); > + } > > /* Set the display info, using edid if available, otherwise > * resetting the values to defaults. This duplicates the work > diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c > index ef65dd97d700..890038758660 100644 > --- a/drivers/gpu/drm/drm_edid.c > +++ b/drivers/gpu/drm/drm_edid.c > @@ -1992,6 +1992,7 @@ struct edid *drm_do_get_edid(struct drm_connector *connector, > { > int i, j = 0, valid_extensions = 0; > u8 *edid, *new; > + size_t hf_eeodb_blk_count; > struct edid *override; > > override = drm_get_override_edid(connector); > @@ -2051,7 +2052,35 @@ struct edid *drm_do_get_edid(struct drm_connector *connector, > } > > kfree(edid); > + return (struct edid *)new; > + } > + > + hf_eeodb_blk_count = drm_edid_read_hf_eeodb_blk_count((struct edid *)edid); > + if (hf_eeodb_blk_count >= 2) { > + new = krealloc(edid, (hf_eeodb_blk_count + 1) * EDID_LENGTH, GFP_KERNEL); > + if (!new) > + goto out; > edid = new; > + > + valid_extensions = hf_eeodb_blk_count - 1; > + for (j = 2; j <= hf_eeodb_blk_count; j++) { > + u8 *block = edid + j * EDID_LENGTH; > + > + for (i = 0; i < 4; i++) { > + if (get_edid_block(data, block, j, EDID_LENGTH)) > + goto out; > + if (drm_edid_block_valid(block, j, false, NULL)) > + break; > + } > + > + if (i == 4) > + valid_extensions--; > + } > + > + if (valid_extensions != hf_eeodb_blk_count - 1) { > + DRM_ERROR("Not able to retrieve proper EDID contain HF-EEODB data.\n"); > + goto out; > + } > } > > return (struct edid *)edid; > @@ -3315,15 +3344,17 @@ add_detailed_modes(struct drm_connector *connector, struct edid *edid, > #define VIDEO_BLOCK 0x02 > #define VENDOR_BLOCK 0x03 > #define SPEAKER_BLOCK 0x04 > -#define HDR_STATIC_METADATA_BLOCK 0x6 > -#define USE_EXTENDED_TAG 0x07 > -#define EXT_VIDEO_CAPABILITY_BLOCK 0x00 > +#define EXT_VIDEO_CAPABILITY_BLOCK 0x00 > +#define HDR_STATIC_METADATA_BLOCK 0x06 > +#define USE_EXTENDED_TAG 0x07 > #define EXT_VIDEO_DATA_BLOCK_420 0x0E > -#define EXT_VIDEO_CAP_BLOCK_Y420CMDB 0x0F > +#define EXT_VIDEO_CAP_BLOCK_Y420CMDB 0x0F > +#define EXT_VIDEO_HF_EEODB_DATA_BLOCK 0x78 > #define EDID_BASIC_AUDIO (1 << 6) > #define EDID_CEA_YCRCB444 (1 << 5) > #define EDID_CEA_YCRCB422 (1 << 4) > #define EDID_CEA_VCDB_QS (1 << 6) > +#define HF_EEODB_LENGTH 2 > > /* > * Search EDID for CEA extension block. > @@ -4273,9 +4304,41 @@ static bool cea_db_is_y420vdb(const u8 *db) > return true; > } > > +static bool cea_db_is_hdmi_forum_eeodb(const u8 *db) > +{ > + if (cea_db_tag(db) != USE_EXTENDED_TAG) > + return false; > + > + if (cea_db_payload_len(db) != HF_EEODB_LENGTH) > + return false; > + > + if (cea_db_extended_tag(db) != EXT_VIDEO_HF_EEODB_DATA_BLOCK) > + return false; > + > + return true; > +} > + > #define for_each_cea_db(cea, i, start, end) \ > for ((i) = (start); (i) < (end) && (i) + cea_db_payload_len(&(cea)[(i)]) < (end); (i) += cea_db_payload_len(&(cea)[(i)]) + 1) > > +size_t drm_edid_read_hf_eeodb_blk_count(const struct edid *edid) > +{ > + const u8 *cea; > + int i, start, end, ext_index = 0; > + > + if (edid->extensions) { > + cea = drm_find_cea_extension(edid, &ext_index); > + > + if (cea && !cea_db_offsets(cea, &start, &end)) > + for_each_cea_db(cea, i, start, end) > + if (cea_db_is_hdmi_forum_eeodb(&cea[i])) > + return cea[i + 2]; > + } > + > + return 0; > +} > +EXPORT_SYMBOL_GPL(drm_edid_read_hf_eeodb_blk_count); > + > static void drm_parse_y420cmdb_bitmap(struct drm_connector *connector, > const u8 *db) > { > diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h > index 144c495b99c4..5549da7bd7be 100644 > --- a/include/drm/drm_edid.h > +++ b/include/drm/drm_edid.h > @@ -592,6 +592,6 @@ drm_display_mode_from_cea_vic(struct drm_device *dev, > u8 video_code); > const u8 *drm_find_edid_extension(const struct edid *edid, > int ext_id, int *ext_index); > - > +size_t drm_edid_read_hf_eeodb_blk_count(const struct edid *edid); > > #endif /* __DRM_EDID_H__ */ -- Jani Nikula, Intel Open Source Graphics Center