buildroot/package/libcamera/0002-Revert-libcamera-rkisp1-Eliminate-hard-coded-resizer.patch

From 6e24360d3fc91cbeecb4f5cf432cd194bc098618 Mon Sep 17 00:00:00 2001
From: Quentin Schulz <quentin.schulz@cherry.de>
Date: Thu, 3 Apr 2025 20:09:00 +0200
Subject: [PATCH] Revert "libcamera: rkisp1: Eliminate hard-coded resizer
 limits"

This reverts commit e85c7ddd38ce8456ab01c2a73baf9e788f6a462e.

Linux kernel predating 6.4 (specifically commit 7cfb35d3a800 ("media:
rkisp1: Implement ENUM_FRAMESIZES") do not have the ioctl in rkisp1
driver required to dynamically query the resizer limits.

Because of that, maxResolution and minResolution are both {0, 0}
(default value for Size objects) which means filterSensorResolution()
will create an entry for the sensor in sensorSizesMap_ but because the
sensor resolution cannot fit inside the min and max resolution of the
rkisp1, no size is put into this entry in sensorSizesMap_.
On the next call to filterSensorResolution(),
sensorSizesMap_.find(sensor) will return the entry but when attempting
to call back() on iter->second, it'll trigger an assert because the size
array is empty.

Linux kernel 6.1 is supported until December 2027, so it seems premature
to get rid of those hard-coded resizer limits before this happens.

Let's restore the hard-coded resizer limits as fallbacks, actual limits
are still queried from the driver on recent enough kernels.

Fixes: 761545407c76 ("pipeline: rkisp1: Filter out sensor sizes not supported by the pipeline")
Signed-off-by: Quentin Schulz <quentin.schulz@cherry.de>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Upstream: https://git.libcamera.org/libcamera/libcamera.git/commit/?id=6e24360d3fc91cbeecb4f5cf432cd194bc098618
Signed-off-by: Quentin Schulz <quentin.schulz@cherry.de>
---
 src/libcamera/pipeline/rkisp1/rkisp1_path.cpp | 21 +++++++++++++------
 src/libcamera/pipeline/rkisp1/rkisp1_path.h   |  3 ++-
 2 files changed, 17 insertions(+), 7 deletions(-)

diff --git a/src/libcamera/pipeline/rkisp1/rkisp1_path.cpp b/src/libcamera/pipeline/rkisp1/rkisp1_path.cpp
index eee5b09e..64018dc5 100644
--- a/src/libcamera/pipeline/rkisp1/rkisp1_path.cpp
+++ b/src/libcamera/pipeline/rkisp1/rkisp1_path.cpp
@@ -54,8 +54,11 @@ const std::map<PixelFormat, uint32_t> formatToMediaBus = {
 
 } /* namespace */
 
-RkISP1Path::RkISP1Path(const char *name, const Span<const PixelFormat> &formats)
-	: name_(name), running_(false), formats_(formats), link_(nullptr)
+RkISP1Path::RkISP1Path(const char *name, const Span<const PixelFormat> &formats,
+		       const Size &minResolution, const Size &maxResolution)
+	: name_(name), running_(false), formats_(formats),
+	  minResolution_(minResolution), maxResolution_(maxResolution),
+	  link_(nullptr)
 {
 }
 
@@ -517,10 +520,12 @@ void RkISP1Path::stop()
 }
 
 /*
- * \todo Remove the hardcoded formats once all users will have migrated to a
- * recent enough kernel.
+ * \todo Remove the hardcoded resolutions and formats once kernels older than
+ * v6.4 will stop receiving LTS support (scheduled for December 2027 for v6.1).
  */
 namespace {
+constexpr Size RKISP1_RSZ_MP_SRC_MIN{ 32, 16 };
+constexpr Size RKISP1_RSZ_MP_SRC_MAX{ 4416, 3312 };
 constexpr std::array<PixelFormat, 18> RKISP1_RSZ_MP_FORMATS{
 	formats::YUYV,
 	formats::NV16,
@@ -542,6 +547,8 @@ constexpr std::array<PixelFormat, 18> RKISP1_RSZ_MP_FORMATS{
 	formats::SRGGB12,
 };
 
+constexpr Size RKISP1_RSZ_SP_SRC_MIN{ 32, 16 };
+constexpr Size RKISP1_RSZ_SP_SRC_MAX{ 1920, 1920 };
 constexpr std::array<PixelFormat, 8> RKISP1_RSZ_SP_FORMATS{
 	formats::YUYV,
 	formats::NV16,
@@ -555,12 +562,14 @@ constexpr std::array<PixelFormat, 8> RKISP1_RSZ_SP_FORMATS{
 } /* namespace */
 
 RkISP1MainPath::RkISP1MainPath()
-	: RkISP1Path("main", RKISP1_RSZ_MP_FORMATS)
+	: RkISP1Path("main", RKISP1_RSZ_MP_FORMATS,
+		     RKISP1_RSZ_MP_SRC_MIN, RKISP1_RSZ_MP_SRC_MAX)
 {
 }
 
 RkISP1SelfPath::RkISP1SelfPath()
-	: RkISP1Path("self", RKISP1_RSZ_SP_FORMATS)
+	: RkISP1Path("self", RKISP1_RSZ_SP_FORMATS,
+		     RKISP1_RSZ_SP_SRC_MIN, RKISP1_RSZ_SP_SRC_MAX)
 {
 }
 
diff --git a/src/libcamera/pipeline/rkisp1/rkisp1_path.h b/src/libcamera/pipeline/rkisp1/rkisp1_path.h
index 2a1ef0ab..430181d3 100644
--- a/src/libcamera/pipeline/rkisp1/rkisp1_path.h
+++ b/src/libcamera/pipeline/rkisp1/rkisp1_path.h
@@ -34,7 +34,8 @@ struct V4L2SubdeviceFormat;
 class RkISP1Path
 {
 public:
-	RkISP1Path(const char *name, const Span<const PixelFormat> &formats);
+	RkISP1Path(const char *name, const Span<const PixelFormat> &formats,
+		   const Size &minResolution, const Size &maxResolution);
 
 	bool init(MediaDevice *media);