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Tue, 5 May 2026 11:23:15 -0400 (EDT) Date: Tue, 5 May 2026 17:23:14 +0200 From: Niklas =?utf-8?Q?S=C3=B6derlund?= To: Jacopo Mondi Cc: Laurent Pinchart , Jai Luthra , Mauro Carvalho Chehab , Geert Uytterhoeven , Magnus Damm , linux-media@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org, Jacopo Mondi Subject: Re: [PATCH] media: rcar-vin: Drop min_queued_buffers Message-ID: <20260505152314.GF683841@ragnatech.se> References: <20260504-rcar-vin-min-queued-buffs-v1-1-59d20ad5cd2d@ideasonboard.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20260504-rcar-vin-min-queued-buffs-v1-1-59d20ad5cd2d@ideasonboard.com> Hi Jacopo, Thanks for your work. On 2026-05-04 14:43:14 +0200, Jacopo Mondi wrote: > From: Jacopo Mondi > > The R-Car VIN driver already uses a scratch buffer to sustain capture > operations in absence of a frame buffer provided by userspace. > > There is no reason to require 4 buffers queued at all times for the > driver to operate. Drop min_queued_buffers from the VIN driver to allow > single-frame capture operations. > > Signed-off-by: Jacopo Mondi Reviewed-by: Niklas Söderlund Tested-by: Niklas Söderlund > --- > This allows to capture a single frame when the R-Car VIN is used > to feed the R-Car ISP on R-Car V4H. > > Signed-off-by: Jacopo Mondi > --- > drivers/media/platform/renesas/rcar-vin/rcar-dma.c | 1 - > 1 file changed, 1 deletion(-) > > diff --git a/drivers/media/platform/renesas/rcar-vin/rcar-dma.c b/drivers/media/platform/renesas/rcar-vin/rcar-dma.c > index f9af9177e02f..73cda0e2d45a 100644 > --- a/drivers/media/platform/renesas/rcar-vin/rcar-dma.c > +++ b/drivers/media/platform/renesas/rcar-vin/rcar-dma.c > @@ -1494,7 +1494,6 @@ int rvin_dma_register(struct rvin_dev *vin, int irq) > q->ops = &rvin_qops; > q->mem_ops = &vb2_dma_contig_memops; > q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC; > - q->min_queued_buffers = 4; > q->dev = vin->dev; > > ret = vb2_queue_init(q); > > --- > base-commit: d9c8c4adf23d17549c0ec9c85b99d85a0ee6cf18 > change-id: 20260504-rcar-vin-min-queued-buffs-31891f226fe6 > > Best regards, > -- > Jacopo Mondi > -- Kind Regards, Niklas Söderlund