linux-kernel - [PATCH DNI 23/26] media: pisp_be: Implement set/get_pad

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Message-Id: <20250717-multicontext-mainline-2025-v1-23-81ac18979c03@ideasonboard.com>
Date: Thu, 17 Jul 2025 12:45:49 +0200
From: Jacopo Mondi <jacopo.mondi@...asonboard.com>
To: Sakari Ailus <sakari.ailus@...ux.intel.com>, 
 Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
 Tomi Valkeinen <tomi.valkeinen@...asonboard.com>, 
 Kieran Bingham <kieran.bingham@...asonboard.com>, 
 Nicolas Dufresne <nicolas.dufresne@...labora.com>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>, 
 Tomasz Figa <tfiga@...omium.org>, 
 Marek Szyprowski <m.szyprowski@...sung.com>, 
 Raspberry Pi Kernel Maintenance <kernel-list@...pberrypi.com>, 
 Florian Fainelli <florian.fainelli@...adcom.com>, 
 Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>, 
 Hans Verkuil <hverkuil@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-media@...r.kernel.org, 
 linux-rpi-kernel@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org, 
 Jacopo Mondi <jacopo.mondi@...asonboard.com>
Subject: [PATCH DNI 23/26] media: pisp_be: Implement set/get_pad_fmt

Implement operation handlers for the set and get pad_fmt subdev
pad operations.

Format is only modifiable on the image nodes (of both output and capture
types). Only sizes can be modified.

Signed-off-by: Jacopo Mondi <jacopo.mondi@...asonboard.com>
---
 .../media/platform/raspberrypi/pisp_be/pisp_be.c   | 29 ++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/media/platform/raspberrypi/pisp_be/pisp_be.c b/drivers/media/platform/raspberrypi/pisp_be/pisp_be.c
index 5aec4f8979053500c870e71ce7171bbd1cac9606..22e440f387b5e5560b2cc80a8b3bf6064dc12d7c 100644
--- a/drivers/media/platform/raspberrypi/pisp_be/pisp_be.c
+++ b/drivers/media/platform/raspberrypi/pisp_be/pisp_be.c
@@ -1488,7 +1488,36 @@ static int pispbe_init_node(struct pispbe_dev *pispbe, unsigned int id)
 	return ret;
 }
 
+static int pispbe_subdev_set_pad_fmt(struct v4l2_subdev *sd,
+				     struct v4l2_subdev_state *state,
+				     struct v4l2_subdev_format *format)
+{
+	struct v4l2_mbus_framefmt *fmt = &format->format;
+
+	/* Only allow setting sizes on the image input and output pads. */
+
+	switch (format->pad) {
+	case TDN_INPUT_NODE:
+	case STITCH_INPUT_NODE:
+	case TDN_OUTPUT_NODE:
+	case STITCH_OUTPUT_NODE:
+		return -EINVAL;
+	}
+
+	fmt->width = clamp(fmt->width, PISP_BACK_END_MIN_TILE_WIDTH,
+			   PISP_BACK_END_MAX_TILE_WIDTH);
+	fmt->height = clamp(fmt->height, PISP_BACK_END_MIN_TILE_HEIGHT,
+			    PISP_BACK_END_MAX_TILE_HEIGHT);
+	fmt->code = MEDIA_BUS_FMT_FIXED;
+
+	*v4l2_subdev_state_get_format(state, format->pad) = *fmt;
+
+	return 0;
+}
+
 static const struct v4l2_subdev_pad_ops pispbe_pad_ops = {
+	.set_fmt = pispbe_subdev_set_pad_fmt,
+	.get_fmt = v4l2_subdev_get_fmt,
 	.link_validate = v4l2_subdev_link_validate_default,
 };
 

-- 
2.49.0