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([82.78.167.248]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-488a91686f9sm285777675e9.10.2026.04.07.06.35.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 07 Apr 2026 06:35:34 -0700 (PDT) From: Claudiu X-Google-Original-From: Claudiu 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, fabrizio.castro.jz@renesas.com Cc: 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 Subject: [PATCH v3 05/15] dmaengine: sh: rz-dmac: Save the start LM descriptor Date: Tue, 7 Apr 2026 16:34:57 +0300 Message-ID: <20260407133507.887404-6-claudiu.beznea.uj@bp.renesas.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260407133507.887404-1-claudiu.beznea.uj@bp.renesas.com> References: <20260407133507.887404-1-claudiu.beznea.uj@bp.renesas.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Claudiu Beznea Save the start LM descriptor to avoid looping through the entire channel's LM descriptor list when computing the residue. This avoids unnecessary iterations. Signed-off-by: Claudiu Beznea --- 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 ef775ffa1099..cd639aa9186a 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; }; =20 #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_d= mac_chan *channel) struct rz_dmac_desc *d =3D channel->desc; u32 chcfg =3D CHCFG_MEM_COPY; =20 + d->start_lmdesc =3D lmdesc; + /* prepare descriptor */ lmdesc->sa =3D d->src; lmdesc->da =3D d->dest; @@ -377,6 +380,7 @@ static void rz_dmac_prepare_descs_for_slave_sg(struct r= z_dmac_chan *channel) } =20 lmdesc =3D channel->lmdesc.tail; + d->start_lmdesc =3D lmdesc; =20 for (i =3D 0, sg =3D sgl; i < sg_len; i++, sg =3D sg_next(sg)) { if (d->direction =3D=3D DMA_DEV_TO_MEM) { @@ -693,9 +697,10 @@ rz_dmac_get_next_lmdesc(struct rz_lmdesc *base, struct= rz_lmdesc *lmdesc) return next; } =20 -static u32 rz_dmac_calculate_residue_bytes_in_vd(struct rz_dmac_chan *chan= nel, u32 crla) +static u32 rz_dmac_calculate_residue_bytes_in_vd(struct rz_dmac_chan *chan= nel, + struct rz_dmac_desc *desc, u32 crla) { - struct rz_lmdesc *lmdesc =3D channel->lmdesc.head; + struct rz_lmdesc *lmdesc =3D desc->start_lmdesc; struct dma_chan *chan =3D &channel->vc.chan; struct rz_dmac *dmac =3D to_rz_dmac(chan->device); u32 residue =3D 0, i =3D 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); } =20 static enum dma_status rz_dmac_tx_status(struct dma_chan *chan, --=20 2.43.0