From patchwork Wed Apr 10 08:11:59 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Shankar, Uma" X-Patchwork-Id: 13623826 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 AE38DCD11C2 for ; Wed, 10 Apr 2024 08:03:51 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id F338310E4A4; Wed, 10 Apr 2024 08:03:50 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="Wro406xk"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.17]) by gabe.freedesktop.org (Postfix) with ESMTPS id 8680910E860; Wed, 10 Apr 2024 08:03:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1712736229; x=1744272229; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=XOf2KPD80cmCNb3qeDuz6Z0Vn/To2cRRX13nJzu/Pbk=; b=Wro406xkoZx7isXa85v4WwHUTWsujoJTqN3NEYPJboJGNpzSLssaYXY8 WheHQm/lnzKV4MS0XOz690mmMVpKZmWJAlTqrNmKJbCS5xVl5RBButQF/ qDxKPKR7CY0w0oGflJ4LWocUiDw0BtSsbR4tEm1lo2jDGWSWqtePou+HG KljqtnAeBX4GrZ1f6cbHjFsXxbsQagrci7jPFnm/CN3V4QnObFyB8BqMw fUZeGOMxKJCQyGUncdU/TZMiJVIuXL0CZ3TezEwLRWKPKLAA7KdvIrSuK AyJYJ9OAn9OKNcQqUEIs0UBI/EVM90DgGu83du92t+dWbNr/j80yd7bUl g==; X-CSE-ConnectionGUID: 9beDveZ/R3e/mPQxHx+GQA== X-CSE-MsgGUID: MkDgsZ2wTqu55mTQ8CEgfA== X-IronPort-AV: E=McAfee;i="6600,9927,11039"; a="8187714" X-IronPort-AV: E=Sophos;i="6.07,190,1708416000"; d="scan'208";a="8187714" Received: from orviesa003.jf.intel.com ([10.64.159.143]) by orvoesa109.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Apr 2024 01:03:49 -0700 X-CSE-ConnectionGUID: PduTarusQealS+IR9TqVgQ== X-CSE-MsgGUID: SLAzVtykQZW87qAmGlpgHA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.07,190,1708416000"; d="scan'208";a="25169400" Received: from cfl-desktop.iind.intel.com ([10.190.239.20]) by orviesa003.jf.intel.com with ESMTP; 10 Apr 2024 01:03:47 -0700 From: Uma Shankar To: intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org Cc: chaitanya.kumar.borah@intel.com, Uma Shankar Subject: [PATCH] drm/i915: Implement Audio WA_14020863754 Date: Wed, 10 Apr 2024 13:41:59 +0530 Message-ID: <20240410081159.915205-1-uma.shankar@intel.com> X-Mailer: git-send-email 2.42.0 MIME-Version: 1.0 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: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" WA_14020863754: Corner case with Min Hblank Fix can cause audio hang Issue: Previously a fix was made to avoid issues with extremely small hblanks, called the "Min Hblank Fix". However, this can potentially cause an audio hang. Workaround : During "Audio Programming Sequence" Audio Enabling - When DP mode is enabled Set mmio offset 0x65F1C bit 18 = 1b, before step #1 "Enable audio Presence Detect" During "Audio Programming Sequence" Audio Disabling - When DP mode is enabled Clear mmio offset 0x65F1C bit 18 = 0b, after step #6 "Disable Audio PD (Presence Detect)" If not clearing PD bit, must also not clear 0x65F1C bit 18 (leave = 1b) Signed-off-by: Uma Shankar --- drivers/gpu/drm/i915/display/intel_audio.c | 12 ++++++++++++ drivers/gpu/drm/i915/display/intel_audio_regs.h | 3 +++ 2 files changed, 15 insertions(+) diff --git a/drivers/gpu/drm/i915/display/intel_audio.c b/drivers/gpu/drm/i915/display/intel_audio.c index 07e0c73204f3..a8e3e515aaa0 100644 --- a/drivers/gpu/drm/i915/display/intel_audio.c +++ b/drivers/gpu/drm/i915/display/intel_audio.c @@ -512,6 +512,12 @@ static void hsw_audio_codec_disable(struct intel_encoder *encoder, intel_de_rmw(i915, HSW_AUD_PIN_ELD_CP_VLD, AUDIO_OUTPUT_ENABLE(cpu_transcoder), 0); + /* + * WA_14020863754: Implement Audio Workaround + * Corner case with Min Hblank Fix can cause audio hang + */ + intel_de_rmw(i915, AUD_CHICKENBIT_REG3, CHICKEN3_SPARE18, 0); + mutex_unlock(&i915->display.audio.mutex); } @@ -637,6 +643,12 @@ static void hsw_audio_codec_enable(struct intel_encoder *encoder, if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DP)) enable_audio_dsc_wa(encoder, crtc_state); + /* + * WA_14020863754: Implement Audio Workaround + * Corner case with Min Hblank Fix can cause audio hang + */ + intel_de_rmw(i915, AUD_CHICKENBIT_REG3, 0, CHICKEN3_SPARE18); + /* Enable audio presence detect */ intel_de_rmw(i915, HSW_AUD_PIN_ELD_CP_VLD, 0, AUDIO_OUTPUT_ENABLE(cpu_transcoder)); diff --git a/drivers/gpu/drm/i915/display/intel_audio_regs.h b/drivers/gpu/drm/i915/display/intel_audio_regs.h index 616e7b1275c4..6f8d33299ecd 100644 --- a/drivers/gpu/drm/i915/display/intel_audio_regs.h +++ b/drivers/gpu/drm/i915/display/intel_audio_regs.h @@ -148,4 +148,7 @@ #define HBLANK_START_COUNT_96 4 #define HBLANK_START_COUNT_128 5 +#define AUD_CHICKENBIT_REG3 _MMIO(0x65F1C) +#define CHICKEN3_SPARE18 REG_BIT(18) + #endif /* __INTEL_AUDIO_REGS_H__ */