linux-kernel - [PATCH v4 02/11] media: atmel: atmel-isc-base: use streaming status when queueing buffers

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Message-ID: <20220121131416.603972-3-eugen.hristev@microchip.com>
Date:   Fri, 21 Jan 2022 15:14:07 +0200
From:   Eugen Hristev <eugen.hristev@...rochip.com>
To:     <robh+dt@...nel.org>, <linux-media@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <jacopo+renesas@...ndi.org>, <hverkuil-cisco@...all.nl>
CC:     <nicolas.ferre@...rochip.com>, <sakari.ailus@....fi>,
        <laurent.pinchart@...asonboard.com>,
        Eugen Hristev <eugen.hristev@...rochip.com>
Subject: [PATCH v4 02/11] media: atmel: atmel-isc-base: use streaming status when queueing buffers

During experiments with libcamera, it looks like vb2_is_streaming returns
true before our start streaming is called.
Order of operations is streamon -> queue -> start_streaming
ISC would have started the DMA immediately when a buffer is being added
to the vbqueue if the queue is streaming.
It is more safe to start the DMA after the start streaming of the driver is
called.
Thus, even if vb2queue is streaming, add the buffer to the dma queue of the
driver instead of actually starting the DMA process, if the start streaming
has not been called yet.
Tho achieve this, we have to use vb2_start_streaming_called instead of
vb2_is_streaming.

Signed-off-by: Eugen Hristev <eugen.hristev@...rochip.com>
---
Changes in v4:
- changed to using vb2_start_streaming_called instead of stop variable

 drivers/media/platform/atmel/atmel-isc-base.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/media/platform/atmel/atmel-isc-base.c b/drivers/media/platform/atmel/atmel-isc-base.c
index 9c62d0ae7887..6b0005987a17 100644
--- a/drivers/media/platform/atmel/atmel-isc-base.c
+++ b/drivers/media/platform/atmel/atmel-isc-base.c
@@ -439,7 +439,7 @@ static void isc_buffer_queue(struct vb2_buffer *vb)
 
 	spin_lock_irqsave(&isc->dma_queue_lock, flags);
 	if (!isc->cur_frm && list_empty(&isc->dma_queue) &&
-		vb2_is_streaming(vb->vb2_queue)) {
+		vb2_start_streaming_called(vb->vb2_queue)) {
 		isc->cur_frm = buf;
 		isc_start_dma(isc);
 	} else
@@ -1532,7 +1532,7 @@ static int isc_s_awb_ctrl(struct v4l2_ctrl *ctrl)
 
 		isc_update_awb_ctrls(isc);
 
-		if (vb2_is_streaming(&isc->vb2_vidq)) {
+		if (vb2_start_streaming_called(&isc->vb2_vidq)) {
 			/*
 			 * If we are streaming, we can update profile to
 			 * have the new settings in place.
@@ -1549,7 +1549,7 @@ static int isc_s_awb_ctrl(struct v4l2_ctrl *ctrl)
 
 		/* if we have autowhitebalance on, start histogram procedure */
 		if (ctrls->awb == ISC_WB_AUTO &&
-		    vb2_is_streaming(&isc->vb2_vidq) &&
+		    vb2_start_streaming_called(&isc->vb2_vidq) &&
 		    ISC_IS_FORMAT_RAW(isc->config.sd_format->mbus_code))
 			isc_set_histogram(isc, true);
 
-- 
2.25.1