From patchwork Thu Dec 12 19:02:19 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Paul X-Patchwork-Id: 11289259 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 076B06C1 for ; Thu, 12 Dec 2019 19:02:47 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id DA07A2073D for ; Thu, 12 Dec 2019 19:02:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=poorly.run header.i=@poorly.run header.b="VSev1aKO" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DA07A2073D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=poorly.run Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 1F7B96E11A; Thu, 12 Dec 2019 19:02:39 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mail-yb1-xb34.google.com (mail-yb1-xb34.google.com [IPv6:2607:f8b0:4864:20::b34]) by gabe.freedesktop.org (Postfix) with ESMTPS id 6EC506E0FB for ; Thu, 12 Dec 2019 19:02:36 +0000 (UTC) Received: by mail-yb1-xb34.google.com with SMTP id b145so881049yba.8 for ; Thu, 12 Dec 2019 11:02:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=poorly.run; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=K9lf6aOxuRWoy+xgXpb/kbudsEPwE/LDimCLszIH/6E=; b=VSev1aKOFtXShVY/hTw+udpzCfEXPmmgn7xVCmau7iKCp+3i/4S6Dgo0hZMAn/GIdh GprBBIusF6YxZ5W6iDABZXcuJUKkg2qDnPEAssgLJ0QF4WiuT9c9hQwg12F/3BxEVEKz 7UE/yLq35dwqO0A1tKM9lBqb+fWK+z7FSBWt3wA75gh7FsnbhzzPSBfU0uPFUyPg7Iee 6CTDax6mfZLqi2yoO8plVNk+zVb90ZgoJQ0CbcTmgMH2j5gvle8F1GZXT/eaC+74FSHg 8FnktFxUoD4WKtXPBSt/uM2HEQzS9UmteNPm3yM+24gP4u0E/JRtwmeCWjv0odMI/z6r 8UZQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=K9lf6aOxuRWoy+xgXpb/kbudsEPwE/LDimCLszIH/6E=; b=GNvMqN88JOaccywE9pXHWMJ3R/c992tqq/x2RRlfIT07i6F1A06bXDcrg0C5ku8xyz yngrqvqQCMiq7SNcgATpeEO5J+Ge5M2k9LjBbr80WYJ4iPfA98/LYqIADA0OuT3A7Gbp GZEXqrW1/Iby8v/A4knopqZ/MooIYlcJ2XJWyr9hK2L64upV+xUG6RgvuG9719MRZVfU 7bQ7s9a3p/sR9ZyzQAFUTiILhqIAJefZiNOg5QTKh5pN8Vc/fU7SIFRiDloU7OjkQr5Y PEpmK84idPvHlUS9128CUcqbvDqRaaYpX3Wt5m9rogWRsvJcdkKjz60S4ybIcY1YiMcH yBMQ== X-Gm-Message-State: APjAAAUS2RoWWtpPBI4NOxZdVzycXX45s4nngHQa/7ZCE8As/Qy3ZqE5 HFJmSIsOF65oLZKx2rfd2Vmzcsqe/uj2/A== X-Google-Smtp-Source: APXvYqzCvgjlfayqAHLLHjWxqWHL8igJl/CVFo6uHcu33qFBkN0JLsCRgWpAn6W/s+W2cFWAWDU59A== X-Received: by 2002:a25:cbd1:: with SMTP id b200mr5196438ybg.87.1576177355300; Thu, 12 Dec 2019 11:02:35 -0800 (PST) Received: from localhost ([2620:0:1013:11:1e1:4760:6ce4:fc64]) by smtp.gmail.com with ESMTPSA id l5sm2905156ywd.48.2019.12.12.11.02.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Dec 2019 11:02:34 -0800 (PST) From: Sean Paul To: dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org Subject: [PATCH v2 01/12] drm/i915: Fix sha_text population code Date: Thu, 12 Dec 2019 14:02:19 -0500 Message-Id: <20191212190230.188505-2-sean@poorly.run> X-Mailer: git-send-email 2.24.1.735.g03f4e72817-goog In-Reply-To: <20191212190230.188505-1-sean@poorly.run> References: <20191212190230.188505-1-sean@poorly.run> MIME-Version: 1.0 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: daniel.vetter@ffwll.ch, rodrigo.vivi@intel.com, Sean Paul , stable@vger.kernel.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Sean Paul This patch fixes a few bugs: 1- We weren't taking into account sha_leftovers when adding multiple ksvs to sha_text. As such, we were or'ing the end of ksv[j - 1] with the beginning of ksv[j] 2- In the sha_leftovers == 2 and sha_leftovers == 3 case, bstatus was being placed on the wrong half of sha_text, overlapping the leftover ksv value 3- In the sha_leftovers == 2 case, we need to manually terminate the byte stream with 0x80 since the hardware doesn't have enough room to add it after writing M0 The upside is that all of the "HDCP supported" HDMI repeaters I could find on Amazon just strip HDCP anyways, so it turns out to be _really_ hard to hit any of these cases without an MST hub, which is not (yet) supported. Oh, and the sha_leftovers == 1 case works perfectly! Fixes: ee5e5e7a5e0f ("drm/i915: Add HDCP framework + base implementation") Cc: Chris Wilson Cc: Ramalingam C Cc: Daniel Vetter Cc: Sean Paul Cc: Jani Nikula Cc: Joonas Lahtinen Cc: Rodrigo Vivi Cc: intel-gfx@lists.freedesktop.org Cc: # v4.17+ Signed-off-by: Sean Paul Link: https://patchwork.freedesktop.org/patch/msgid/20191203173638.94919-2-sean@poorly.run #v1 Changes in v2: -None Reviewed-by: Ramalingam C --- drivers/gpu/drm/i915/display/intel_hdcp.c | 25 +++++++++++++++++------ include/drm/drm_hdcp.h | 3 +++ 2 files changed, 22 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c b/drivers/gpu/drm/i915/display/intel_hdcp.c index 0fdbd39f6641..eaab9008feef 100644 --- a/drivers/gpu/drm/i915/display/intel_hdcp.c +++ b/drivers/gpu/drm/i915/display/intel_hdcp.c @@ -335,8 +335,10 @@ int intel_hdcp_validate_v_prime(struct intel_connector *connector, /* Fill up the empty slots in sha_text and write it out */ sha_empty = sizeof(sha_text) - sha_leftovers; - for (j = 0; j < sha_empty; j++) - sha_text |= ksv[j] << ((sizeof(sha_text) - j - 1) * 8); + for (j = 0; j < sha_empty; j++) { + u8 off = ((sizeof(sha_text) - j - 1 - sha_leftovers) * 8); + sha_text |= ksv[j] << off; + } ret = intel_write_sha_text(dev_priv, sha_text); if (ret < 0) @@ -426,7 +428,7 @@ int intel_hdcp_validate_v_prime(struct intel_connector *connector, } else if (sha_leftovers == 2) { /* Write 32 bits of text */ I915_WRITE(HDCP_REP_CTL, rep_ctl | HDCP_SHA1_TEXT_32); - sha_text |= bstatus[0] << 24 | bstatus[1] << 16; + sha_text |= bstatus[0] << 8 | bstatus[1]; ret = intel_write_sha_text(dev_priv, sha_text); if (ret < 0) return ret; @@ -440,16 +442,27 @@ int intel_hdcp_validate_v_prime(struct intel_connector *connector, return ret; sha_idx += sizeof(sha_text); } + + /* + * Terminate the SHA-1 stream by hand. For the other leftover + * cases this is appended by the hardware. + */ + I915_WRITE(HDCP_REP_CTL, rep_ctl | HDCP_SHA1_TEXT_32); + sha_text = DRM_HDCP_SHA1_TERMINATOR << 24; + ret = intel_write_sha_text(dev_priv, sha_text); + if (ret < 0) + return ret; + sha_idx += sizeof(sha_text); } else if (sha_leftovers == 3) { - /* Write 32 bits of text */ + /* Write 32 bits of text (filled from LSB) */ I915_WRITE(HDCP_REP_CTL, rep_ctl | HDCP_SHA1_TEXT_32); - sha_text |= bstatus[0] << 24; + sha_text |= bstatus[0]; ret = intel_write_sha_text(dev_priv, sha_text); if (ret < 0) return ret; sha_idx += sizeof(sha_text); - /* Write 8 bits of text, 24 bits of M0 */ + /* Write 8 bits of text (filled from LSB), 24 bits of M0 */ I915_WRITE(HDCP_REP_CTL, rep_ctl | HDCP_SHA1_TEXT_8); ret = intel_write_sha_text(dev_priv, bstatus[1]); if (ret < 0) diff --git a/include/drm/drm_hdcp.h b/include/drm/drm_hdcp.h index 06a11202a097..20498c822204 100644 --- a/include/drm/drm_hdcp.h +++ b/include/drm/drm_hdcp.h @@ -29,6 +29,9 @@ /* Slave address for the HDCP registers in the receiver */ #define DRM_HDCP_DDC_ADDR 0x3A +/* Value to use at the end of the SHA-1 bytestream used for repeaters */ +#define DRM_HDCP_SHA1_TERMINATOR 0x80 + /* HDCP register offsets for HDMI/DVI devices */ #define DRM_HDCP_DDC_BKSV 0x00 #define DRM_HDCP_DDC_RI_PRIME 0x08