From patchwork Thu Dec 7 00:00:10 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Sean Paul X-Patchwork-Id: 10097461 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id E1DB360360 for ; Thu, 7 Dec 2017 00:01:13 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D46022A17E for ; Thu, 7 Dec 2017 00:01:13 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C93092A185; Thu, 7 Dec 2017 00:01:13 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.1 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_MED, T_DKIM_INVALID autolearn=unavailable version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 73C692A17E for ; Thu, 7 Dec 2017 00:01:13 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 98E5C6E74F; Thu, 7 Dec 2017 00:01:01 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mail-yb0-x244.google.com (mail-yb0-x244.google.com [IPv6:2607:f8b0:4002:c09::244]) by gabe.freedesktop.org (Postfix) with ESMTPS id 4B9666E005 for ; Thu, 7 Dec 2017 00:01:00 +0000 (UTC) Received: by mail-yb0-x244.google.com with SMTP id g9so2292358yba.13 for ; Wed, 06 Dec 2017 16:01:00 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=x71MdhO/Peo6hD3N2Dj/VeYaVAZv+tF5SAVj56dlsQY=; b=LQ0iuI1zzwDrdLuL08dxO8uaJEWvwRy7b3w4AjaP3cXOiESyTlsCScz3vsI1MUp0VT hODVESDW/QzWgMNBGMBatu8rAVZGvNJprJYVGD9Zlpa6qbYF9nYgey1cXB/LBpblL8DQ ZSkaMz5OZdqBQlEaW/rP0niK22CLRQ2f8G8yY= 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=x71MdhO/Peo6hD3N2Dj/VeYaVAZv+tF5SAVj56dlsQY=; b=uSoxNYYWDykdiWM+X47Qve3h5zAPO5c3ni2XdZ+j4JxFJQSZtR++yXT4Rop+67y0wv p4Nu05xLkM6LPIm4Zw07Wr1g2kQVzI7ZGzQCn8hra+vxTY5mcMFUx927Dq2fWUowWfsW iJSqtx1DtsukFqzw/su0MxipzqGz8nh5K21a7xIq7Kg7H1yUDOJidQiM2SKVKvXvjLwI +XgjRhmKhtp/srA3zxZ6lAJJI6WaxEkSF9bSlXZnQpKmM65PlmtQvv4lrRj41CFK13Fk PCo17RO6ZRet/LoCUTK0E0XAA+kLgzgQeMZ6PPqpAopxoiHDIAGa2/3HeBvVEb2OxNDD +jlw== X-Gm-Message-State: AJaThX6B1njXCrU7p5OSrmUQc0u0h/RJ2tXTb6t72N3evkkeXSLIreum JzLSyYGOR98ulXTxsfZQwkuFzf2LXV4= X-Google-Smtp-Source: AGs4zMb/yYt5fneLIwU/jYvzXgGjj+M00jVUCcdxeR1WHE4IJCI3V5F4dEtRp2gZh1YJWnG+4hRNuw== X-Received: by 10.37.100.6 with SMTP id y6mr17203616ybb.448.1512604859315; Wed, 06 Dec 2017 16:00:59 -0800 (PST) Received: from rosewood.cam.corp.google.com ([2620:0:1013:11:d3af:69ac:1964:28e8]) by smtp.gmail.com with ESMTPSA id l21sm1852412ywc.34.2017.12.06.16.00.58 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 06 Dec 2017 16:00:58 -0800 (PST) From: Sean Paul To: dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org Subject: [PATCH v4 7/9] drm/i915: Add function to output Aksv over GMBUS Date: Wed, 6 Dec 2017 19:00:10 -0500 Message-Id: <20171207000014.10083-8-seanpaul@chromium.org> X-Mailer: git-send-email 2.15.1.424.g9478a66081-goog In-Reply-To: <20171207000014.10083-1-seanpaul@chromium.org> References: <20171207000014.10083-1-seanpaul@chromium.org> MIME-Version: 1.0 Cc: seanpaul@google.com, David Airlie , Joonas Lahtinen , linux-kernel@vger.kernel.org, Rodrigo Vivi , daniel.vetter@intel.com X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.18 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" X-Virus-Scanned: ClamAV using ClamSMTP Once the Aksv is available in the PCH, we need to get it on the wire to the receiver via DDC. The hardware doesn't allow us to read the value directly, so we need to tell GMBUS to source the Aksv internally and send it to the right offset on the receiver. The way we do this is to initiate an indexed write where the index is the Aksv register offset. We write dummy values to GMBUS3 as if we were sending the key, and the hardware slips in the "real" values when it goes out. Changes in v2: - None Changes in v3: - Uses new index write feature (Ville) Changes in v4: - None Cc: Ville Syrjälä Reviewed-by: Daniel Vetter Signed-off-by: Sean Paul --- drivers/gpu/drm/i915/i915_drv.h | 1 + drivers/gpu/drm/i915/i915_reg.h | 1 + drivers/gpu/drm/i915/intel_i2c.c | 47 +++++++++++++++++++++++++++++++++++++--- 3 files changed, 46 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index bddd65839f60..6b39081c5e53 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -4049,6 +4049,7 @@ extern int intel_setup_gmbus(struct drm_i915_private *dev_priv); extern void intel_teardown_gmbus(struct drm_i915_private *dev_priv); extern bool intel_gmbus_is_valid_pin(struct drm_i915_private *dev_priv, unsigned int pin); +extern int intel_gmbus_output_aksv(struct i2c_adapter *adapter); extern struct i2c_adapter * intel_gmbus_get_adapter(struct drm_i915_private *dev_priv, unsigned int pin); diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 4d66651219e3..35bcc6c308f3 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -3043,6 +3043,7 @@ enum i915_power_well_id { # define GPIO_DATA_PULLUP_DISABLE (1 << 13) #define GMBUS0 _MMIO(dev_priv->gpio_mmio_base + 0x5100) /* clock/port select */ +#define GMBUS_AKSV_SELECT (1<<11) #define GMBUS_RATE_100KHZ (0<<8) #define GMBUS_RATE_50KHZ (1<<8) #define GMBUS_RATE_400KHZ (2<<8) /* reserved on Pineview */ diff --git a/drivers/gpu/drm/i915/intel_i2c.c b/drivers/gpu/drm/i915/intel_i2c.c index d78ce758fbfa..318a68ea577e 100644 --- a/drivers/gpu/drm/i915/intel_i2c.c +++ b/drivers/gpu/drm/i915/intel_i2c.c @@ -30,6 +30,7 @@ #include #include #include +#include #include "intel_drv.h" #include #include "i915_drv.h" @@ -478,7 +479,8 @@ gmbus_index_xfer(struct drm_i915_private *dev_priv, struct i2c_msg *msgs) } static int -do_gmbus_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num) +do_gmbus_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num, + u32 gmbus0_source) { struct intel_gmbus *bus = container_of(adapter, struct intel_gmbus, @@ -488,7 +490,7 @@ do_gmbus_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num) int ret = 0; retry: - I915_WRITE_FW(GMBUS0, bus->reg0); + I915_WRITE_FW(GMBUS0, gmbus0_source | bus->reg0); for (; i < num; i += inc) { inc = 1; @@ -606,7 +608,7 @@ gmbus_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num) if (ret < 0) bus->force_bit &= ~GMBUS_FORCE_BIT_RETRY; } else { - ret = do_gmbus_xfer(adapter, msgs, num); + ret = do_gmbus_xfer(adapter, msgs, num, 0); if (ret == -EAGAIN) bus->force_bit |= GMBUS_FORCE_BIT_RETRY; } @@ -616,6 +618,45 @@ gmbus_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num) return ret; } +int intel_gmbus_output_aksv(struct i2c_adapter *adapter) +{ + struct intel_gmbus *bus = container_of(adapter, struct intel_gmbus, + adapter); + struct drm_i915_private *dev_priv = bus->dev_priv; + int ret; + u8 cmd = DRM_HDCP_DDC_AKSV ; + u8 buf[DRM_HDCP_KSV_LEN] = { 0 }; + struct i2c_msg msgs[] = { + { + .addr = DRM_HDCP_DDC_ADDR, + .flags = 0, + .len = sizeof(cmd), + .buf = &cmd, + }, + { + .addr = DRM_HDCP_DDC_ADDR, + .flags = 0, + .len = sizeof(buf), + .buf = buf, + } + }; + + intel_display_power_get(dev_priv, POWER_DOMAIN_GMBUS); + mutex_lock(&dev_priv->gmbus_mutex); + + /* + * In order to output Aksv to the receiver, use an indexed write to + * pass the i2c command, and tell GMBUS to use the HW-provided value + * instead of sourcing GMBUS3 for the data. + */ + ret = do_gmbus_xfer(adapter, msgs, ARRAY_SIZE(msgs), GMBUS_AKSV_SELECT); + + mutex_unlock(&dev_priv->gmbus_mutex); + intel_display_power_put(dev_priv, POWER_DOMAIN_GMBUS); + + return ret; +} + static u32 gmbus_func(struct i2c_adapter *adapter) { return i2c_bit_algo.functionality(adapter) &