From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 998B63CB90B; Tue, 26 May 2026 08:47:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779785272; cv=none; b=bWmfbNlyjNTLb++SpWZWEb1yoWdfbnlWCULo0iNz0+yAYBmJ8I2Hwft3AZpTPAwijKFH6DzmskO+Lu2FH8/g1M7ocfesgNePdSrBcLf5F+CKTfMHaWhlVe0fGIuzcPIXMiFcYI00VuvoR+7RKCeX0a1ZU1PBVcQkW35wrBs9bBk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779785272; c=relaxed/simple; bh=LM1f+K7t6TYKKobqHrpVTEm41o7msjjzymMZrtuGH78=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=aOyRB0BLfz90K7/tt2gLOEN4oYYPwnQjxdgdovPJpw0lz1shLciNmJhJh+QzUT1igUzA5hBZIp/7yoHpWGD77pmtjfar4P5Pi7+Rs+vLRsi3GWe4b47KuIFwiU328erfbZ3uKtSNFl2Kb6UAmkdz04hAEl447Nj6SfGErPvHkAU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=DDW5HIeu; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="DDW5HIeu" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0F5541F00A3A; Tue, 26 May 2026 08:47:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1779785271; bh=8p2kKCAJLqQkQxs3mctL/1IplJ0yad6mXOuWmw8USPQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=DDW5HIeuaSC66mZMvi1YzCZKsQjBJcupwPsO+ctTHzMqG0HLtWqX9O+0HDm8XVU1o Edfqgx0LCN7O/NP2ofQIB/dWVRJpBsUeYx1aFE2aw2S8BSyeBGsVykCJZYa0UONcr9 zNoakU0fZ38ZGMhqGaZTe4R02Cqvp7qHeL+wq9+aPys1zYhLix74B3UA8QsyuE+tC+ w2tf6f6p7eqSQfTDgV734b9PB1s2Q2RAn2w17F1sYOzWGPO4NpYgqyCFsJ/eBdPfSx Qs8q75oQFlc3qiEJIkvmkmWfgdWx3PHXvb25IFLL5B6D1A0PO2foHpJFuOyMd9nEyT t9BHxSmdfEGAg== From: Claudiu Beznea To: vkoul@kernel.org, Frank.Li@kernel.org, lgirdwood@gmail.com, broonie@kernel.org, perex@perex.cz, tiwai@suse.com, biju.das.jz@bp.renesas.com, prabhakar.mahadev-lad.rj@bp.renesas.com, p.zabel@pengutronix.de, geert+renesas@glider.be, kuninori.morimoto.gx@renesas.com, long.luu.ur@renesas.com Cc: claudiu.beznea@kernel.org, claudiu.beznea@tuxon.dev, dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, linux-sound@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Claudiu Beznea , John Madieu Subject: [PATCH v6 06/18] dmaengine: sh: rz-dmac: Save the start LM descriptor Date: Tue, 26 May 2026 11:46:58 +0300 Message-ID: <20260526084710.3491480-7-claudiu.beznea@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260526084710.3491480-1-claudiu.beznea@kernel.org> References: <20260526084710.3491480-1-claudiu.beznea@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Claudiu Beznea Save the start LM descriptor to avoid starting from the beginning of the channel's LM descriptor list in rz_dmac_calculate_residue_bytes_in_vd(). This avoids unnecessary iterations. Tested-by: John Madieu Signed-off-by: Claudiu Beznea --- Changes in v6: - updated patch description to describe better the changes - collected tags Changes in v5: - none Changes in v4: - none Changes in v3: - none, this patch is new drivers/dma/sh/rz-dmac.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/drivers/dma/sh/rz-dmac.c b/drivers/dma/sh/rz-dmac.c index c48858b68dee..d3926ecd63ac 100644 --- a/drivers/dma/sh/rz-dmac.c +++ b/drivers/dma/sh/rz-dmac.c @@ -58,6 +58,7 @@ struct rz_dmac_desc { /* For slave sg */ struct scatterlist *sg; unsigned int sgcount; + struct rz_lmdesc *start_lmdesc; }; #define to_rz_dmac_desc(d) container_of(d, struct rz_dmac_desc, vd) @@ -343,6 +344,8 @@ static void rz_dmac_prepare_desc_for_memcpy(struct rz_dmac_chan *channel) struct rz_dmac_desc *d = channel->desc; u32 chcfg = CHCFG_MEM_COPY; + d->start_lmdesc = lmdesc; + /* prepare descriptor */ lmdesc->sa = d->src; lmdesc->da = d->dest; @@ -377,6 +380,7 @@ static void rz_dmac_prepare_descs_for_slave_sg(struct rz_dmac_chan *channel) } lmdesc = channel->lmdesc.tail; + d->start_lmdesc = lmdesc; for (i = 0, sg = sgl; i < sg_len; i++, sg = sg_next(sg)) { if (d->direction == DMA_DEV_TO_MEM) { @@ -693,9 +697,10 @@ rz_dmac_get_next_lmdesc(struct rz_lmdesc *base, struct rz_lmdesc *lmdesc) return next; } -static u32 rz_dmac_calculate_residue_bytes_in_vd(struct rz_dmac_chan *channel, u32 crla) +static u32 rz_dmac_calculate_residue_bytes_in_vd(struct rz_dmac_chan *channel, + struct rz_dmac_desc *desc, u32 crla) { - struct rz_lmdesc *lmdesc = channel->lmdesc.head; + struct rz_lmdesc *lmdesc = desc->start_lmdesc; struct dma_chan *chan = &channel->vc.chan; struct rz_dmac *dmac = to_rz_dmac(chan->device); u32 residue = 0, i = 0; @@ -794,7 +799,7 @@ static u32 rz_dmac_chan_get_residue(struct rz_dmac_chan *channel, * Calculate number of bytes transferred in processing virtual descriptor. * One virtual descriptor can have many lmdesc. */ - return crtb + rz_dmac_calculate_residue_bytes_in_vd(channel, crla); + return crtb + rz_dmac_calculate_residue_bytes_in_vd(channel, current_desc, crla); } static enum dma_status rz_dmac_tx_status(struct dma_chan *chan, -- 2.43.0