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pmaports-rtwo/temp/libcamera/0009-software_isp-debayer_egl-Request-input-buffer-alignm.patch
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Robert Mader 093a6b017b temp/libcamera: update downstream patch to merged version 
Replace the dmabuf import patch with the two series that it grow into
during upstreaming, shipping in the next libcamera release. This will:
1. Improve performance for all devices using the GPU-ISP, including
   those not able to use dmabuf import.
2. Simplify debugging.
3. Ensure the patches get enough testing before the upstream release.

While on it backport some additional patches:
1. A follow-up patch adding the last required step to allow dmabuf import
   for input buffers to work in almost all cases *if* the V4L2 driver
   handles custom bytesperline requests for bayer formats.
2. A small logging fix
3. A fix for bad bottom lines of pixels seen on some devices. This is
   the only patch with visual impact - and a quite desirable one.
4. A patch to log the used driver for easier debugging.

This leaves us with only two downstream patches, both specific to the
PinePhone (OG).

Finally, add a "py3-$pkgname-pyc:pyc" subpackage in order to stay in
sync with the upstream package.

Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/8650>
2026-06-20 01:41:18 +00:00

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From 6fee511f290fd0e950e8064cba99204dc08ed552 Mon Sep 17 00:00:00 2001
From: Robert Mader <robert.mader@collabora.com>
Date: Wed, 10 Jun 2026 00:53:56 +0200
Subject: [PATCH 09/13] software_isp: debayer_egl: Request input buffer
alignment of 256 bytes
The most common reason dmabuf import with createInputDMABufTexture2D()
fails is that V4L2 drivers use stride alignments that are not sufficient
(too small) for GPUs, preventing the later from directly using input
buffers and forcing us to do relatively expensive uploads (i.e. copies)
of the buffer contents.
Thus let's request a compatible stride alignment from the V4L2 driver,
which may or may not respect the value. From the v4l2_pix_format ->
bytesperline docs:
> Both applications and drivers can set this field to request padding
> bytes at the end of each line. Drivers however may ignore the value
> requested by the application, returning width times bytes per pixel
> or a larger value required by the hardware. That implies applications
> can just set this field to zero to get a reasonable default.
The approach works as follows:
1. Before setting the input format, query into the debayer class for a
preferred stride based on the bayer format and width. For DebayerCpu
this returns 0, i.e. let the V4L2 driver decide, while for DebayerEGL
the "magic" stride alignment of 256 bytes is used, which is known
to work with all known/common GPUs and already used for output
buffers. Right now there doesn't exist any API to query the correct
value - in many cases it is 64 or 128 - however if e.g. a new EGL
extension will provide it in the future, we can easily implement it
in the new function. Alternatively a config value or env var could be
added there if the need arises.
2. Pass the calculated stride to V4L2VideoDevice::setFormat(), which
again sets it as the bytesperline value.
3. The V4L2 driver will update bytesperline with the value it actually
chose to use. Compare the requested and actual strides and log an info
message if the driver did not honor the request, hinting users at what
could be improved about the kernel driver.
Signed-off-by: Robert Mader <robert.mader@collabora.com>
Tested-by: Milan Zamazal <mzamazal@redhat.com> # rpi4+imx219
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
(cherry picked from commit ff5cb4f17b0b9989dd853b4d4320ddb2c59a9c0e)
---
.../libcamera/internal/software_isp/software_isp.h | 1 +
src/libcamera/pipeline/simple/simple.cpp | 12 ++++++++++++
src/libcamera/software_isp/debayer.cpp | 8 ++++++++
src/libcamera/software_isp/debayer.h | 1 +
src/libcamera/software_isp/debayer_egl.cpp | 8 ++++++++
src/libcamera/software_isp/debayer_egl.h | 1 +
src/libcamera/software_isp/software_isp.cpp | 13 +++++++++++++
7 files changed, 44 insertions(+)
diff --git a/include/libcamera/internal/software_isp/software_isp.h b/include/libcamera/internal/software_isp/software_isp.h
index 585e0d6d9..2a6fbe413 100644
--- a/include/libcamera/internal/software_isp/software_isp.h
+++ b/include/libcamera/internal/software_isp/software_isp.h
@@ -62,6 +62,7 @@ public:
std::tuple<unsigned int, unsigned int>
strideAndFrameSize(const PixelFormat &outputFormat, const Size &size);
+ uint32_t preferredInputStride(const PixelFormat &inputFormat, const Size &size);
int configure(const StreamConfiguration &inputCfg,
const std::vector<std::reference_wrapper<const StreamConfiguration>> &outputCfgs,
diff --git a/src/libcamera/pipeline/simple/simple.cpp b/src/libcamera/pipeline/simple/simple.cpp
index c6fe12d65..e26f438d9 100644
--- a/src/libcamera/pipeline/simple/simple.cpp
+++ b/src/libcamera/pipeline/simple/simple.cpp
@@ -1542,6 +1542,11 @@ int SimplePipelineHandler::configure(Camera *camera, CameraConfiguration *c)
captureFormat.fourcc = videoFormat;
captureFormat.size = pipeConfig->captureSize;
+ uint32_t requested_bpl = 0;
+ if (data->swIsp_)
+ requested_bpl = data->swIsp_->preferredInputStride(videoFormat.toPixelFormat(), pipeConfig->captureSize);
+ captureFormat.planes[0].bpl = requested_bpl;
+
ret = video->setFormat(&captureFormat);
if (ret)
return ret;
@@ -1561,6 +1566,13 @@ int SimplePipelineHandler::configure(Camera *camera, CameraConfiguration *c)
return -EINVAL;
}
+ if (requested_bpl && captureFormat.planes[0].bpl != requested_bpl) {
+ LOG(SimplePipeline, Info)
+ << "Input buffer stride ignored by the driver. "
+ << "Requested " << requested_bpl
+ << ", got " << captureFormat.planes[0].bpl;
+ }
+
/* Configure the converter if needed. */
std::vector<std::reference_wrapper<const StreamConfiguration>> outputCfgs;
data->useConversion_ = config->needConversion();
diff --git a/src/libcamera/software_isp/debayer.cpp b/src/libcamera/software_isp/debayer.cpp
index 2d7abfb83..56446f55d 100644
--- a/src/libcamera/software_isp/debayer.cpp
+++ b/src/libcamera/software_isp/debayer.cpp
@@ -103,6 +103,14 @@ Debayer::~Debayer()
* there is no valid output config
*/
+/**
+ * \fn uint32_t Debayer::preferredInputStride(const PixelFormat &inputFormat, const Size &size)
+ * Get the preferred input stride in bytes for the given input format and size
+ * \param[in] inputFormat The input format
+ * \param[in] size The input size (width and height in pixels)
+ * \return The preferred input stride in bytes or 0 if there is no preference
+ */
+
/**
* \fn void Debayer::process(uint32_t frame, FrameBuffer *input, FrameBuffer *output, DebayerParams params)
* \brief Process the bayer data into the requested format
diff --git a/src/libcamera/software_isp/debayer.h b/src/libcamera/software_isp/debayer.h
index a2a17ec18..28f1b857b 100644
--- a/src/libcamera/software_isp/debayer.h
+++ b/src/libcamera/software_isp/debayer.h
@@ -46,6 +46,7 @@ public:
virtual std::tuple<unsigned int, unsigned int>
strideAndFrameSize(const PixelFormat &outputFormat, const Size &size) = 0;
+ virtual uint32_t preferredInputStride([[maybe_unused]] const PixelFormat &inputFormat, [[maybe_unused]] const Size &size) { return 0; }
virtual void process(uint32_t frame, FrameBuffer *input, FrameBuffer *output, const DebayerParams &params) = 0;
virtual int start() { return 0; }
diff --git a/src/libcamera/software_isp/debayer_egl.cpp b/src/libcamera/software_isp/debayer_egl.cpp
index af21ede45..264a9315d 100644
--- a/src/libcamera/software_isp/debayer_egl.cpp
+++ b/src/libcamera/software_isp/debayer_egl.cpp
@@ -17,6 +17,7 @@
#include <libcamera/base/utils.h>
#include <libcamera/formats.h>
+#include "libcamera/internal/formats.h"
#include "../glsl_shaders.h"
@@ -373,6 +374,12 @@ DebayerEGL::strideAndFrameSize(const PixelFormat &outputFormat, const Size &size
return std::make_tuple(stride, stride * size.height);
}
+uint32_t DebayerEGL::preferredInputStride(const PixelFormat &inputFormat, const Size &size)
+{
+ const PixelFormatInfo &info = PixelFormatInfo::info(inputFormat);
+ return info.stride(size.width, 0, 256);
+}
+
void DebayerEGL::setShaderVariableValues(const DebayerParams &params)
{
/*
@@ -655,3 +662,4 @@ SizeRange DebayerEGL::sizes(PixelFormat inputFormat, const Size &inputSize)
}
} /* namespace libcamera */
+
diff --git a/src/libcamera/software_isp/debayer_egl.h b/src/libcamera/software_isp/debayer_egl.h
index f2a127b0d..c7cb009b6 100644
--- a/src/libcamera/software_isp/debayer_egl.h
+++ b/src/libcamera/software_isp/debayer_egl.h
@@ -51,6 +51,7 @@ public:
std::vector<PixelFormat> formats(PixelFormat input) override;
std::tuple<unsigned int, unsigned int> strideAndFrameSize(const PixelFormat &outputFormat, const Size &size) override;
+ uint32_t preferredInputStride(const PixelFormat &inputFormat, const Size &size) override;
void process(uint32_t frame, FrameBuffer *input, FrameBuffer *output, const DebayerParams &params) override;
int start() override;
diff --git a/src/libcamera/software_isp/software_isp.cpp b/src/libcamera/software_isp/software_isp.cpp
index d227bd8e3..9c4a59f08 100644
--- a/src/libcamera/software_isp/software_isp.cpp
+++ b/src/libcamera/software_isp/software_isp.cpp
@@ -253,6 +253,19 @@ SoftwareIsp::strideAndFrameSize(const PixelFormat &outputFormat, const Size &siz
return debayer_->strideAndFrameSize(outputFormat, size);
}
+/**
+ * Get the preferred input stride in bytes for the given input format and size
+ * \param[in] inputFormat The input format
+ * \param[in] size The input size (width and height in pixels)
+ * \return The preferred input stride in bytes or 0 if there is no preference
+ */
+uint32_t SoftwareIsp::preferredInputStride(const PixelFormat &inputFormat, const Size &size)
+{
+ ASSERT(debayer_);
+
+ return debayer_->preferredInputStride(inputFormat, size);
+}
+
/**
* \brief Configure the SoftwareIsp object according to the passed in parameters
* \param[in] inputCfg The input configuration
--
2.54.0
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