linux-kernel - [PATCH v9 16/19] media: ti: j721e-csi2rx: Return the partial frame as error

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Message-ID: <20251230083220.2405247-17-r-donadkar@ti.com>
Date: Tue, 30 Dec 2025 14:02:17 +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 16/19] media: ti: j721e-csi2rx: Return the partial frame as error

After draining, when a buffer is queued to the driver, ti will fill out
the buffer with a partial frame as some part of the frame is drained.
Return the partial frame with VB2_BUF_STATE_ERROR.

Signed-off-by: Rishikesh Donadkar <r-donadkar@...com>
---
 drivers/media/platform/ti/j721e-csi2rx/j721e-csi2rx.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/ti/j721e-csi2rx/j721e-csi2rx.c b/drivers/media/platform/ti/j721e-csi2rx/j721e-csi2rx.c
index e713293696eb1..3922bd67e78da 100644
--- a/drivers/media/platform/ti/j721e-csi2rx/j721e-csi2rx.c
+++ b/drivers/media/platform/ti/j721e-csi2rx/j721e-csi2rx.c
@@ -83,6 +83,7 @@ struct ti_csi2rx_buffer {
 enum ti_csi2rx_dma_state {
 	TI_CSI2RX_DMA_STOPPED,	/* Streaming not started yet. */
 	TI_CSI2RX_DMA_ACTIVE,	/* Streaming and pending DMA operation. */
+	TI_CSI2RX_DMA_DRAINING, /* Dumping all the data in drain buffer */
 };
 
 struct ti_csi2rx_dma {
@@ -728,12 +729,20 @@ static void ti_csi2rx_dma_callback(void *param)
 	spin_lock_irqsave(&dma->lock, flags);
 
 	WARN_ON(!list_is_first(&buf->list, &dma->submitted));
-	vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
+
+	if (dma->state == TI_CSI2RX_DMA_DRAINING) {
+		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
+		dma->state = TI_CSI2RX_DMA_ACTIVE;
+	} else {
+		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
+	}
+
 	list_del(&buf->list);
 
 	ti_csi2rx_dma_submit_pending(ctx);
 
 	if (list_empty(&dma->submitted)) {
+		dma->state = TI_CSI2RX_DMA_DRAINING;
 		if (ti_csi2rx_drain_dma(ctx))
 			dev_warn(ctx->csi->dev,
 				 "DMA drain failed on one of the transactions\n");
-- 
2.34.1