linux-kernel - [PATCH v9 14/19] media: ti: j721e-csi2rx: Submit all available buffers

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Message-ID: <20251230083220.2405247-15-r-donadkar@ti.com>
Date: Tue, 30 Dec 2025 14:02:15 +0530
From: Rishikesh Donadkar <r-donadkar@...com>
To: <jai.luthra@...ux.dev>, <laurent.pinchart@...asonboard.com>,
	<mripard@...nel.org>
CC: <r-donadkar@...com>, <y-abhilashchandra@...com>, <devarsht@...com>,
	<s-jain1@...com>, <vigneshr@...com>, <mchehab@...nel.org>, <robh@...nel.org>,
	<krzk+dt@...nel.org>, <p.zabel@...gutronix.de>, <conor+dt@...nel.org>,
	<sakari.ailus@...ux.intel.com>, <hverkuil-cisco@...all.nl>,
	<tomi.valkeinen@...asonboard.com>, <jai.luthra@...asonboard.com>,
	<changhuang.liang@...rfivetech.com>, <jack.zhu@...rfivetech.com>,
	<sjoerd@...labora.com>, <dan.carpenter@...aro.org>,
	<hverkuil+cisco@...nel.org>, <linux-kernel@...r.kernel.org>,
	<linux-media@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: [PATCH v9 14/19] media: ti: j721e-csi2rx: Submit all available buffers

From: Jai Luthra <j-luthra@...com>

We already make sure to submit all available buffers to DMA in each DMA
completion callback.

Move that logic in a separate function, and use it during stream start
as well, as most application queue all their buffers before stream on.

Signed-off-by: Jai Luthra <j-luthra@...com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Reviewed-by: Yemike Abhilash Chandra <y-abhilashchandra@...com>
Co-developed-by: Rishikesh Donadkar <r-donadkar@...com>
Signed-off-by: Rishikesh Donadkar <r-donadkar@...com>
---
 .../platform/ti/j721e-csi2rx/j721e-csi2rx.c   | 42 +++++++++++--------
 1 file changed, 24 insertions(+), 18 deletions(-)

diff --git a/drivers/media/platform/ti/j721e-csi2rx/j721e-csi2rx.c b/drivers/media/platform/ti/j721e-csi2rx/j721e-csi2rx.c
index 4a063364f893e..fa6152464d4b6 100644
--- a/drivers/media/platform/ti/j721e-csi2rx/j721e-csi2rx.c
+++ b/drivers/media/platform/ti/j721e-csi2rx/j721e-csi2rx.c
@@ -672,11 +672,32 @@ static int ti_csi2rx_drain_dma(struct ti_csi2rx_ctx *ctx)
 	return ret;
 }
 
+static int ti_csi2rx_dma_submit_pending(struct ti_csi2rx_ctx *ctx)
+{
+	struct ti_csi2rx_dma *dma = &ctx->dma;
+	struct ti_csi2rx_buffer *buf;
+	int ret = 0;
+
+	/* If there are more buffers to process then start their transfer. */
+	while (!list_empty(&dma->queue)) {
+		buf = list_entry(dma->queue.next, struct ti_csi2rx_buffer, list);
+		ret = ti_csi2rx_start_dma(ctx, buf);
+		if (ret) {
+			dev_err(ctx->csi->dev,
+				"Failed to queue the next buffer for DMA\n");
+			vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
+			list_del(&buf->list);
+		} else {
+			list_move_tail(&buf->list, &dma->submitted);
+		}
+	}
+	return ret;
+}
+
 static void ti_csi2rx_dma_callback(void *param)
 {
 	struct ti_csi2rx_buffer *buf = param;
 	struct ti_csi2rx_ctx *ctx = buf->ctx;
-	struct ti_csi2rx_dev *csi = ctx->csi;
 	struct ti_csi2rx_dma *dma = &ctx->dma;
 	unsigned long flags;
 
@@ -693,18 +714,7 @@ static void ti_csi2rx_dma_callback(void *param)
 	vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
 	list_del(&buf->list);
 
-	/* If there are more buffers to process then start their transfer. */
-	while (!list_empty(&dma->queue)) {
-		buf = list_entry(dma->queue.next, struct ti_csi2rx_buffer, list);
-
-		if (ti_csi2rx_start_dma(ctx, buf)) {
-			dev_err(csi->dev, "Failed to queue the next buffer for DMA\n");
-			list_del(&buf->list);
-			vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
-		} else {
-			list_move_tail(&buf->list, &dma->submitted);
-		}
-	}
+	ti_csi2rx_dma_submit_pending(ctx);
 
 	if (list_empty(&dma->submitted))
 		dma->state = TI_CSI2RX_DMA_IDLE;
@@ -1143,7 +1153,6 @@ static int ti_csi2rx_sd_enable_streams(struct v4l2_subdev *sd,
 	struct ti_csi2rx_ctx *ctx = &csi->ctx[pad - TI_CSI2RX_PAD_FIRST_SOURCE];
 	struct ti_csi2rx_dma *dma = &ctx->dma;
 	struct media_pad *remote_pad;
-	struct ti_csi2rx_buffer *buf;
 	const struct ti_csi2rx_fmt *fmt;
 	unsigned long flags;
 	u64 sink_streams;
@@ -1170,16 +1179,13 @@ static int ti_csi2rx_sd_enable_streams(struct v4l2_subdev *sd,
 	ctx->sequence = 0;
 
 	spin_lock_irqsave(&dma->lock, flags);
-	buf = list_entry(dma->queue.next, struct ti_csi2rx_buffer, list);
 
-	ret = ti_csi2rx_start_dma(ctx, buf);
+	ret = ti_csi2rx_dma_submit_pending(ctx);
 	if (ret) {
-		dev_err(csi->dev, "Failed to start DMA: %d\n", ret);
 		spin_unlock_irqrestore(&dma->lock, flags);
 		return ret;
 	}
 
-	list_move_tail(&buf->list, &dma->submitted);
 	dma->state = TI_CSI2RX_DMA_ACTIVE;
 	spin_unlock_irqrestore(&dma->lock, flags);
 
-- 
2.34.1