From patchwork Wed May 10 17:39:07 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oswald Buddenhagen X-Patchwork-Id: 13237127 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 alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (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 B12E3C77B7C for ; Wed, 10 May 2023 17:43:18 +0000 (UTC) Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id 97E701014; Wed, 10 May 2023 19:42:26 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz 97E701014 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1683740596; bh=VaseVVvAIjy6UfrsHwNDccuOs0g9omTa1JDulHP3lRw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-Id: List-Archive:List-Help:List-Owner:List-Post:List-Subscribe: List-Unsubscribe:From; b=qM6BV6jgIacT1X7xLaFNQVwFurU9oSBMc2Ml292KXzd0azao8izQbba3F+Y2xuVvr JyU8G/N13nBpJd4tzmKkGfi0l8dIsOmhFZ563woFXbm1QVzH+bqXDLdoKuXfvoBrul JaJtPyEl8ESWAAYVeF7V5tiKcxmHRlw6iDd4Ry5g= Received: from mailman-core.alsa-project.org (mailman-core.alsa-project.org [10.254.200.10]) by alsa1.perex.cz (Postfix) with ESMTP id 69522F805A8; Wed, 10 May 2023 19:39:55 +0200 (CEST) Received: by alsa1.perex.cz (Postfix, from userid 50401) id 03097F8052E; Wed, 10 May 2023 19:39:39 +0200 (CEST) Received: from bluemchen.kde.org (bluemchen.kde.org [209.51.188.41]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id 8732BF80534 for ; Wed, 10 May 2023 19:39:22 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 8732BF80534 Received: from ugly.fritz.box (localhost [127.0.0.1]) by bluemchen.kde.org (Postfix) with ESMTP id 2BCBD2423B; Wed, 10 May 2023 13:39:18 -0400 (EDT) Received: by ugly.fritz.box (masqmail 0.3.4, from userid 1000) id 1pwnmX-tT0-00; Wed, 10 May 2023 19:39:17 +0200 From: Oswald Buddenhagen To: alsa-devel@alsa-project.org Cc: Takashi Iwai , Jaroslav Kysela Subject: [PATCH 04/14] ALSA: emu10k1: simplify snd_emu10k1_audigy_dsp_convert_32_to_2x16() Date: Wed, 10 May 2023 19:39:07 +0200 Message-Id: <20230510173917.3073107-5-oswald.buddenhagen@gmx.de> X-Mailer: git-send-email 2.40.0.152.g15d061e6df In-Reply-To: <20230510173917.3073107-1-oswald.buddenhagen@gmx.de> References: <20230510173917.3073107-1-oswald.buddenhagen@gmx.de> MIME-Version: 1.0 Message-ID-Hash: GSRFMVRMHGAPIQHYHI5WPETBG4Q5CQTM X-Message-ID-Hash: GSRFMVRMHGAPIQHYHI5WPETBG4Q5CQTM X-MailFrom: ossi@kde.org X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-alsa-devel.alsa-project.org-0; header-match-alsa-devel.alsa-project.org-1; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.8 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: Instead of spending lots of instructions on masking and transplanting the sign bit, sidestep the issue by replacing the last bit shift with a wrapping addition to self. Solution stolen from kX-project, after I pondered other ideas first. Also, the function really doesn't need to return a constant int value. Signed-off-by: Oswald Buddenhagen --- sound/pci/emu10k1/emufx.c | 26 +++++++++++++------------- 1 file changed, 13 insertions(+), 13 deletions(-) diff --git a/sound/pci/emu10k1/emufx.c b/sound/pci/emu10k1/emufx.c index 795b2573fef4..8ba294138dfe 100644 --- a/sound/pci/emu10k1/emufx.c +++ b/sound/pci/emu10k1/emufx.c @@ -1184,20 +1184,22 @@ snd_emu10k1_init_stereo_onoff_control(struct snd_emu10k1_fx8010_control_gpr *ctl * to 2 x 16-bit registers in Audigy - their values are read via DMA. * Conversion is performed by Audigy DSP instructions of FX8010. */ -static int snd_emu10k1_audigy_dsp_convert_32_to_2x16( +static void snd_emu10k1_audigy_dsp_convert_32_to_2x16( struct snd_emu10k1_fx8010_code *icode, u32 *ptr, int tmp, int bit_shifter16, int reg_in, int reg_out) { - A_OP(icode, ptr, iACC3, A_GPR(tmp + 1), reg_in, A_C_00000000, A_C_00000000); - A_OP(icode, ptr, iANDXOR, A_GPR(tmp), A_GPR(tmp + 1), A_GPR(bit_shifter16 - 1), A_C_00000000); - A_OP(icode, ptr, iTSTNEG, A_GPR(tmp + 2), A_GPR(tmp), A_C_80000000, A_GPR(bit_shifter16 - 2)); - A_OP(icode, ptr, iANDXOR, A_GPR(tmp + 2), A_GPR(tmp + 2), A_C_80000000, A_C_00000000); - A_OP(icode, ptr, iANDXOR, A_GPR(tmp), A_GPR(tmp), A_GPR(bit_shifter16 - 3), A_C_00000000); - A_OP(icode, ptr, iMACINT0, A_GPR(tmp), A_C_00000000, A_GPR(tmp), A_C_00010000); - A_OP(icode, ptr, iANDXOR, reg_out, A_GPR(tmp), A_C_ffffffff, A_GPR(tmp + 2)); - A_OP(icode, ptr, iACC3, reg_out + 1, A_GPR(tmp + 1), A_C_00000000, A_C_00000000); - return 1; + // This leaves the low word in place, which is fine, + // as the low bits are completely ignored subsequently. + // reg_out[1] = reg_in + A_OP(icode, ptr, iACC3, reg_out + 1, reg_in, A_C_00000000, A_C_00000000); + // It is fine to read reg_in multiple times. + // tmp = reg_in << 15 + A_OP(icode, ptr, iMACINT1, A_GPR(tmp), A_C_00000000, reg_in, A_GPR(bit_shifter16)); + // Left-shift once more. This is a separate step, as the + // signed multiplication would clobber the MSB. + // reg_out[0] = tmp + ((tmp << 31) >> 31) + A_OP(icode, ptr, iMAC3, reg_out, A_GPR(tmp), A_GPR(tmp), A_C_80000000); } /* @@ -1247,10 +1249,8 @@ static int _snd_emu10k1_audigy_init_efx(struct snd_emu10k1 *emu) ptr = 0; nctl = 0; gpr = stereo_mix + 10; - gpr_map[gpr++] = 0x00007fff; - gpr_map[gpr++] = 0x00008000; - gpr_map[gpr++] = 0x0000ffff; bit_shifter16 = gpr; + gpr_map[gpr++] = 0x00008000; #if 1 /* PCM front Playback Volume (independent from stereo mix)