From patchwork Tue Aug 27 16:39:04 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Derek Foreman X-Patchwork-Id: 13779797 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 28183C54731 for ; Tue, 27 Aug 2024 16:39:37 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 8984110E38A; Tue, 27 Aug 2024 16:39:36 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (1024-bit key; unprotected) header.d=collabora.com header.i=derek.foreman@collabora.com header.b="BnGj81Zd"; dkim-atps=neutral Received: from sender4-pp-f112.zoho.com (sender4-pp-f112.zoho.com [136.143.188.112]) by gabe.freedesktop.org (Postfix) with ESMTPS id 742D310E38A for ; Tue, 27 Aug 2024 16:39:35 +0000 (UTC) ARC-Seal: i=1; a=rsa-sha256; t=1724776770; cv=none; d=zohomail.com; s=zohoarc; b=ms4VjhhhQLSp/cOdSmmB9m0GI2z2Mf38RQZ+jjR9wIVM11hoXjGCbE8su/J7DWcoH+Wu1Ed1HCpTOotLfbNXoQBnC+LWcFDht9il6kVk6WP19yysS5iQaIxdIKWSbjaYmBV1IVTJPN7w/AaAJJELwJ3m3iKkk8PSVEG4eZwrgpo= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1724776770; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:MIME-Version:Message-ID:Subject:Subject:To:To:Message-Id:Reply-To; bh=PysjLYYTobfjpCkNvp5rpF4+UHOJO/yIh0Yk4ecR/F0=; b=dsJGXNF7ZW4tI6Vu3PJCNWihoVvhK9Jqjn5CNYb+HwWOQbMkuufc7RULJ9U9vFfS4dOh5TOsrFe5XzXggvrHRrQ4MUTpaXXRzcPNWAx0B29PJPFCPM/ey0Xf4a+ola3G7bka0s+bTe4Tr4uzQGguYGqyLvbk6vs6JOQtsdSI18c= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass header.i=collabora.com; spf=pass smtp.mailfrom=derek.foreman@collabora.com; dmarc=pass header.from= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1724776770; s=zohomail; d=collabora.com; i=derek.foreman@collabora.com; h=From:From:To:To:Cc:Cc:Subject:Subject:Date:Date:Message-ID:MIME-Version:Content-Transfer-Encoding:Message-Id:Reply-To; bh=PysjLYYTobfjpCkNvp5rpF4+UHOJO/yIh0Yk4ecR/F0=; b=BnGj81Zd1mDeGLMYPor5iRYrWmA50jHjHGhNHtswin7e6FAgFPA/ODbaT2Lqw+Ew BKDMC7fnqNF8CQYhPC1Ef2ql6NGFpAJ7jh4+Sms2xrZwx/ibU+mGfpCfXeV5BHJ4zwZ hhKsLZOny9xwac0oFrfLuWMs3vFjVfRMOvTuJ5Ms= Received: by mx.zohomail.com with SMTPS id 1724776769491557.6911820771234; Tue, 27 Aug 2024 09:39:29 -0700 (PDT) From: Derek Foreman To: dri-devel@lists.freedesktop.org Cc: Maxime Ripard , kernel@collabora.com, Jani Nikula , Helge Deller , linux-fbdev@vger.kernel.org, Derek Foreman Subject: [PATCH v4] drm/connector: hdmi: Fix writing Dynamic Range Mastering infoframes Date: Tue, 27 Aug 2024 11:39:04 -0500 Message-ID: <20240827163918.48160-1-derek.foreman@collabora.com> X-Mailer: git-send-email 2.45.2 MIME-Version: 1.0 X-ZohoMailClient: External 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: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" The largest infoframe we create is the DRM (Dynamic Range Mastering) infoframe which is 26 bytes + a 4 byte header, for a total of 30 bytes. With HDMI_MAX_INFOFRAME_SIZE set to 29 bytes, as it is now, we allocate too little space to pack a DRM infoframe in write_device_infoframe(), leading to an ENOSPC return from hdmi_infoframe_pack(), and never calling the connector's write_infoframe() vfunc. Instead of having HDMI_MAX_INFOFRAME_SIZE defined in two places, replace HDMI_MAX_INFOFRAME_SIZE with HDMI_INFOFRAME_SIZE(MAX) and make MAX 27 bytes - which is defined by the HDMI specification to be the largest infoframe payload. Fixes: f378b77227bc ("drm/connector: hdmi: Add Infoframes generation") Fixes: c602e4959a0c ("drm/connector: hdmi: Create Infoframe DebugFS entries") Signed-off-by: Derek Foreman Acked-by: Maxime Ripard Reviewed-by: Jani Nikula --- drivers/gpu/drm/display/drm_hdmi_state_helper.c | 4 +--- drivers/gpu/drm/drm_debugfs.c | 4 +--- include/linux/hdmi.h | 9 +++++++++ 3 files changed, 11 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/display/drm_hdmi_state_helper.c b/drivers/gpu/drm/display/drm_hdmi_state_helper.c index 7854820089ec..feb7a3a75981 100644 --- a/drivers/gpu/drm/display/drm_hdmi_state_helper.c +++ b/drivers/gpu/drm/display/drm_hdmi_state_helper.c @@ -521,8 +521,6 @@ int drm_atomic_helper_connector_hdmi_check(struct drm_connector *connector, } EXPORT_SYMBOL(drm_atomic_helper_connector_hdmi_check); -#define HDMI_MAX_INFOFRAME_SIZE 29 - static int clear_device_infoframe(struct drm_connector *connector, enum hdmi_infoframe_type type) { @@ -563,7 +561,7 @@ static int write_device_infoframe(struct drm_connector *connector, { const struct drm_connector_hdmi_funcs *funcs = connector->hdmi.funcs; struct drm_device *dev = connector->dev; - u8 buffer[HDMI_MAX_INFOFRAME_SIZE]; + u8 buffer[HDMI_INFOFRAME_SIZE(MAX)]; int ret; int len; diff --git a/drivers/gpu/drm/drm_debugfs.c b/drivers/gpu/drm/drm_debugfs.c index 6b239a24f1df..9d3e6dd68810 100644 --- a/drivers/gpu/drm/drm_debugfs.c +++ b/drivers/gpu/drm/drm_debugfs.c @@ -520,8 +520,6 @@ static const struct file_operations drm_connector_fops = { .write = connector_write }; -#define HDMI_MAX_INFOFRAME_SIZE 29 - static ssize_t audio_infoframe_read(struct file *filp, char __user *ubuf, size_t count, loff_t *ppos) { @@ -579,7 +577,7 @@ static ssize_t _f##_read_infoframe(struct file *filp, \ struct drm_connector *connector; \ union hdmi_infoframe *frame; \ struct drm_device *dev; \ - u8 buf[HDMI_MAX_INFOFRAME_SIZE]; \ + u8 buf[HDMI_INFOFRAME_SIZE(MAX)]; \ ssize_t len = 0; \ \ connector = filp->private_data; \ diff --git a/include/linux/hdmi.h b/include/linux/hdmi.h index 3bb87bf6bc65..455f855bc084 100644 --- a/include/linux/hdmi.h +++ b/include/linux/hdmi.h @@ -59,6 +59,15 @@ enum hdmi_infoframe_type { #define HDMI_DRM_INFOFRAME_SIZE 26 #define HDMI_VENDOR_INFOFRAME_SIZE 4 +/* + * HDMI 1.3a table 5-14 states that the largest InfoFrame_length is 27, + * not including the packet header or checksum byte. We include the + * checksum byte in HDMI_INFOFRAME_HEADER_SIZE, so this should allow + * HDMI_INFOFRAME_SIZE(MAX) to be the largest buffer we could ever need + * for any HDMI infoframe. + */ +#define HDMI_MAX_INFOFRAME_SIZE 27 + #define HDMI_INFOFRAME_SIZE(type) \ (HDMI_INFOFRAME_HEADER_SIZE + HDMI_ ## type ## _INFOFRAME_SIZE)