From patchwork Tue May 20 18:09:03 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jesse Barnes X-Patchwork-Id: 4212471 Return-Path: X-Original-To: patchwork-intel-gfx@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id C95F7BEEAB for ; Tue, 20 May 2014 18:09:19 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id DAFF1201F2 for ; Tue, 20 May 2014 18:09:18 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id 8BBCC201DE for ; Tue, 20 May 2014 18:09:17 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id ACDD46E1AD; Tue, 20 May 2014 11:09:16 -0700 (PDT) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from gproxy5-pub.mail.unifiedlayer.com (gproxy5-pub.mail.unifiedlayer.com [67.222.38.55]) by gabe.freedesktop.org (Postfix) with SMTP id 1ED086E1AD for ; Tue, 20 May 2014 11:09:15 -0700 (PDT) Received: (qmail 15603 invoked by uid 0); 20 May 2014 18:09:14 -0000 Received: from unknown (HELO CMOut01) (10.0.90.82) by gproxy5.mail.unifiedlayer.com with SMTP; 20 May 2014 18:09:14 -0000 Received: from box514.bluehost.com ([74.220.219.114]) by CMOut01 with id 4J981o01A2UhLwi01J9BfY; Tue, 20 May 2014 12:09:13 -0600 X-Authority-Analysis: v=2.1 cv=EOmVjTpC c=1 sm=1 tr=0 a=9W6Fsu4pMcyimqnCr1W0/w==:117 a=9W6Fsu4pMcyimqnCr1W0/w==:17 a=cNaOj0WVAAAA:8 a=f5113yIGAAAA:8 a=jEoilibZg0cA:10 a=3ROhxo7VqVMA:10 a=TBVoxVdAAAAA:8 a=GhZ5P8ky69gA:10 a=noBwr2J6l1kA:10 a=CnEnlex638D7Nmv60DgA:9 a=rW6DTWptwo0A:10 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=virtuousgeek.org; s=default; h=References:In-Reply-To:Message-Id:Date:Subject:To:From; bh=bgv0rwRa+I4I+SLnY5LCiRsJK9s4XJSxJmnbZ3wYrjA=; b=G277+apCXI1zALervsRAGQb5OdooMUSOn1EdNVFkqTL5Ol9INcTP6oIYuvN0QKqeLwibyie22Qt8fNi+8hwBqbE/bO9LNHLcdUvXiIhBoPWy9agTY68Y9R4kdPPzlrNR; Received: from [67.161.37.189] (port=48334 helo=localhost.localdomain) by box514.bluehost.com with esmtpsa (TLSv1.2:DHE-RSA-AES256-GCM-SHA384:256) (Exim 4.82) (envelope-from ) id 1WmoTM-0006Vk-AI for intel-gfx@lists.freedesktop.org; Tue, 20 May 2014 12:09:08 -0600 From: Jesse Barnes To: intel-gfx@lists.freedesktop.org Date: Tue, 20 May 2014 11:09:03 -0700 Message-Id: <1400609343-1076-1-git-send-email-jbarnes@virtuousgeek.org> X-Mailer: git-send-email 1.8.4.2 In-Reply-To: <1400541397-22588-1-git-send-email-jbarnes@virtuousgeek.org> References: <1400541397-22588-1-git-send-email-jbarnes@virtuousgeek.org> X-Identified-User: {10642:box514.bluehost.com:virtuous:virtuousgeek.org} {sentby:smtp auth 67.161.37.189 authed with jbarnes@virtuousgeek.org} Subject: [Intel-gfx] [PATCH] drm/i915/vlv: assert and de-assert sideband reset at boot and resume v3 X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" X-Spam-Status: No, score=-3.4 required=5.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_BL_SPAMCOP_NET, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, T_DKIM_INVALID, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This is a bit like the CMN reset de-assert we do in DPIO_CTL, except that it resets the whole common lane section of the PHY. This is required on machines where the BIOS doesn't do this for us on boot or resume to properly re-calibrate and get the PHY ready to transmit data. Without this patch, such machines won't resume correctly much of the time, with the symptom being a 'port ready' timeout and/or a link training failure. v2: extract simpler set_power_well function for use in reset_dpio (Imre) move to reset_dpio (Daniel & Ville) v3: don't reset if DPIO reset is already de-asserted (Imre) Signed-off-by: Jesse Barnes --- drivers/gpu/drm/i915/intel_display.c | 19 +++++++++++++++++++ drivers/gpu/drm/i915/intel_drv.h | 3 ++- drivers/gpu/drm/i915/intel_pm.c | 13 ++++++++++--- 3 files changed, 31 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index df58afc..bdb4624 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -1509,6 +1509,25 @@ static void intel_reset_dpio(struct drm_device *dev) } else { /* + * If DPIO has already been reset, e.g. by BIOS, just skip all + * this. + */ + if (I915_READ(DPIO_CTL) & DPIO_CMNRST) + return; + + /* + * From VLV2A0_DP_eDP_HDMI_DPIO_driver_vbios_notes_11.docx: + * Need to assert and de-assert PHY SB reset by gating the + * common lane power, then un-gating it. + * Simply ungating isn't enough to reset the PHY enough to get + * ports and lanes running. + */ + __vlv_set_power_well(dev_priv, PUNIT_POWER_WELL_DPIO_CMN_BC, + false); + __vlv_set_power_well(dev_priv, PUNIT_POWER_WELL_DPIO_CMN_BC, + true); + + /* * From VLV2A0_DP_eDP_DPIO_driver_vbios_notes_10.docx - * 6. De-assert cmn_reset/side_reset. Same as VLV X0. * a. GUnit 0x2110 bit[0] set to 1 (def 0) diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index 0ef2777..feb6165 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -966,7 +966,8 @@ void intel_runtime_pm_put(struct drm_i915_private *dev_priv); void intel_init_runtime_pm(struct drm_i915_private *dev_priv); void intel_fini_runtime_pm(struct drm_i915_private *dev_priv); void ilk_wm_get_hw_state(struct drm_device *dev); - +void __vlv_set_power_well(struct drm_i915_private *dev_priv, + enum punit_power_well power_well_id, bool enable); /* intel_sdvo.c */ bool intel_sdvo_init(struct drm_device *dev, uint32_t sdvo_reg, bool is_sdvob); diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index b59e8ab..8f7dbb9 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -5724,10 +5724,9 @@ static bool i9xx_always_on_power_well_enabled(struct drm_i915_private *dev_priv, return true; } -static void vlv_set_power_well(struct drm_i915_private *dev_priv, - struct i915_power_well *power_well, bool enable) +void __vlv_set_power_well(struct drm_i915_private *dev_priv, + enum punit_power_well power_well_id, bool enable) { - enum punit_power_well power_well_id = power_well->data; u32 mask; u32 state; u32 ctrl; @@ -5760,6 +5759,14 @@ out: mutex_unlock(&dev_priv->rps.hw_lock); } +static void vlv_set_power_well(struct drm_i915_private *dev_priv, + struct i915_power_well *power_well, bool enable) +{ + enum punit_power_well power_well_id = power_well->data; + + __vlv_set_power_well(dev_priv, power_well_id, enable); +} + static void vlv_power_well_sync_hw(struct drm_i915_private *dev_priv, struct i915_power_well *power_well) {