From mboxrd@z Thu Jan 1 00:00:00 1970 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6D71AC433F5 for ; Mon, 15 Nov 2021 23:10:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 54BB16120F for ; Mon, 15 Nov 2021 23:10:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242228AbhKOXNH (ORCPT ); Mon, 15 Nov 2021 18:13:07 -0500 Received: from mail.kernel.org ([198.145.29.99]:39116 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243918AbhKOTGi (ORCPT ); Mon, 15 Nov 2021 14:06:38 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 6081E633F0; Mon, 15 Nov 2021 18:17:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1637000223; bh=y8+Me6CpmX5PqIny91teTC27N/PKc/yXKnrtroHGTc0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ipYFDDNUTBuUoW+Nzx7BIz5u175ZwIDIL4bVNZg++TbuXMBKkcP4rppotP7OIMnHg fWjoB5Ie6kWy1MMz/ZiSgUdci9D1DnsONsJrcEXLj0jKe7mxHQqPo1nI+nE19Gh9Or WSqJDFhpPV9L+ICfbfy46YJMKxVxA4t/V3tfn8xY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Pierre-Louis Bossart , Takashi Iwai , Sasha Levin Subject: [PATCH 5.14 583/849] ALSA: hda: Use position buffer for SKL+ again Date: Mon, 15 Nov 2021 18:01:06 +0100 Message-Id: <20211115165439.978311913@linuxfoundation.org> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211115165419.961798833@linuxfoundation.org> References: <20211115165419.961798833@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Takashi Iwai [ Upstream commit c4ca3871e21fa085096316f5f8d9975cf3dfde1d ] The commit f87e7f25893d ("ALSA: hda - Improved position reporting on SKL+") changed the PCM position report for SKL+ chips to use DPIB, but according to Pierre, DPIB is no best choice for the accurate position reports and it often reports too early. The recommended method is rather the classical position buffer. This patch makes the PCM position reporting on SKL+ back to the position buffer again. Fixes: f87e7f25893d ("ALSA: hda - Improved position reporting on SKL+") Suggested-by: Pierre-Louis Bossart Reviewed-by: Pierre-Louis Bossart Link: https://lore.kernel.org/r/20210929072934.6809-3-tiwai@suse.de Signed-off-by: Takashi Iwai Signed-off-by: Sasha Levin --- sound/pci/hda/hda_intel.c | 23 +---------------------- 1 file changed, 1 insertion(+), 22 deletions(-) diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c index e224feb792a08..ec17e40c710ea 100644 --- a/sound/pci/hda/hda_intel.c +++ b/sound/pci/hda/hda_intel.c @@ -881,27 +881,6 @@ static int azx_get_delay_from_fifo(struct azx *chip, struct azx_dev *azx_dev, return substream->runtime->delay; } -static unsigned int azx_skl_get_dpib_pos(struct azx *chip, - struct azx_dev *azx_dev) -{ - return _snd_hdac_chip_readl(azx_bus(chip), - AZX_REG_VS_SDXDPIB_XBASE + - (AZX_REG_VS_SDXDPIB_XINTERVAL * - azx_dev->core.index)); -} - -/* get the current DMA position with correction on SKL+ chips */ -static unsigned int azx_get_pos_skl(struct azx *chip, struct azx_dev *azx_dev) -{ - /* DPIB register gives a more accurate position for playback */ - if (azx_dev->core.substream->stream == SNDRV_PCM_STREAM_PLAYBACK) - return azx_skl_get_dpib_pos(chip, azx_dev); - - /* read of DPIB fetches the actual posbuf */ - azx_skl_get_dpib_pos(chip, azx_dev); - return azx_get_pos_posbuf(chip, azx_dev); -} - static void __azx_shutdown_chip(struct azx *chip, bool skip_link_reset) { azx_stop_chip(chip); @@ -1598,7 +1577,7 @@ static void assign_position_fix(struct azx *chip, int fix) [POS_FIX_POSBUF] = azx_get_pos_posbuf, [POS_FIX_VIACOMBO] = azx_via_get_position, [POS_FIX_COMBO] = azx_get_pos_lpib, - [POS_FIX_SKL] = azx_get_pos_skl, + [POS_FIX_SKL] = azx_get_pos_posbuf, [POS_FIX_FIFO] = azx_get_pos_fifo, }; -- 2.33.0