linux-kernel - [RFC v1 02/11] media: v4l2-isp: Add helper function to compute extended stats size

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Message-ID: <20260123080938.3367348-3-antoine.bouyer@nxp.com>
Date: Fri, 23 Jan 2026 09:09:29 +0100
From: Antoine Bouyer <antoine.bouyer@....com>
To: julien.vuillaumier@....com,
	alexi.birlinger@....com,
	daniel.baluta@....com,
	peng.fan@....com,
	frank.li@....com,
	jacopo.mondi@...asonboard.com,
	laurent.pinchart@...asonboard.com,
	mchehab@...nel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	shawnguo@...nel.org,
	s.hauer@...gutronix.de,
	kernel@...gutronix.de,
	festevam@...il.com
Cc: linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Antoine Bouyer <antoine.bouyer@....com>
Subject: [RFC v1 02/11] media: v4l2-isp: Add helper function to compute extended stats size

v4l2-isp framework only supports extended buffer for generic ISP
configuration. This patch adds simple helper function to compute the
extended statistics buffer size, exactly the same as for extended
parameters, except that it uses the `v4l2_isp_stats_block_header`
structure definition to prevent conflict with the
`v4l2_isp_params_block_header` one.

Signed-off-by: Antoine Bouyer <antoine.bouyer@....com>
---
 include/media/v4l2-isp.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/media/v4l2-isp.h b/include/media/v4l2-isp.h
index f3a6d0edcb24..d0a265162440 100644
--- a/include/media/v4l2-isp.h
+++ b/include/media/v4l2-isp.h
@@ -27,6 +27,19 @@ struct vb2_buffer;
 #define v4l2_isp_params_buffer_size(max_params_size) \
 	(offsetof(struct v4l2_isp_params_buffer, data) + (max_params_size))
 
+/**
+ * v4l2_isp_stats_buffer_size - Calculate size of v4l2_isp_stats_buffer
+ * @max_stats_size: The total size of the ISP statistic blocks
+ *
+ * Users of the v4l2 extensible statistics will produce differing sized data
+ * arrays depending on their specific ISP blocks. Drivers and userspace will
+ * need to be able to calculate the appropriate size of the structure to
+ * accommodate all ISP statistics blocks provided by the driver.
+ * This macro provides a convenient tool for the calculation.
+ */
+#define v4l2_isp_stats_buffer_size(max_stats_size) \
+	(offsetof(struct v4l2_isp_stats_buffer, data) + (max_stats_size))
+
 /**
  * v4l2_isp_params_validate_buffer_size - Validate a V4L2 ISP buffer sizes
  * @dev: the driver's device pointer
-- 
2.52.0