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Sat, 11 Apr 2026 05:38:42 -0700 (PDT) Message-ID: Date: Sat, 11 Apr 2026 15:38:41 +0300 Precedence: bulk X-Mailing-List: linux-sound@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 07/17] dmaengine: sh: rz-dmac: Save the start LM descriptor To: Biju Das , "vkoul@kernel.org" , "Frank.Li@kernel.org" , "lgirdwood@gmail.com" , "broonie@kernel.org" , "perex@perex.cz" , "tiwai@suse.com" , Prabhakar Mahadev Lad , "p.zabel@pengutronix.de" , "geert+renesas@glider.be" , Fabrizio Castro , Long Luu Cc: "dmaengine@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-sound@vger.kernel.org" , "linux-renesas-soc@vger.kernel.org" , Claudiu Beznea References: <20260411114303.2814115-1-claudiu.beznea.uj@bp.renesas.com> <20260411114303.2814115-8-claudiu.beznea.uj@bp.renesas.com> Content-Language: en-US From: Claudiu Beznea In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 4/11/26 15:34, Biju Das wrote: > Hi Claudiu, > >> -----Original Message----- >> From: Claudiu >> Sent: 11 April 2026 12:43 >> Subject: [PATCH v4 07/17] dmaengine: sh: rz-dmac: Save the start LM descriptor >> >> 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 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 6bea7c8c7053..0f871c0a28bd >> 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) > > U32 normally used with register read/writes hardware related. > > Here it is just computation which returns number of bytes. Unsigned int will be > appropriate instead of u32. Please check the type of residue as defined by dma_set_residue(). Thank you, Claudiu