media: iris: implement reqbuf ioctl with vb2_queue_setup

Implement the reqbuf IOCTL op and the vb2_queue_setup vb2 op in the
driver with necessary hooks.

Reviewed-by: Hans Verkuil <hverkuil@xs4all.nl>
Tested-by: Stefan Schmidt <stefan.schmidt@linaro.org> # x1e80100 (Dell XPS 13 9345)
Reviewed-by: Stefan Schmidt <stefan.schmidt@linaro.org>
Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8550-QRD
Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8550-HDK
Signed-off-by: Dikshita Agarwal <quic_dikshita@quicinc.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>

1 files changed, 119 insertions, 0 deletions

diff --git a/drivers/media/platform/qcom/iris/iris_buffer.c b/drivers/media/platform/qcom/iris/iris_buffer.c
new file mode 100644
index 000000000000..037931ce6550
--- /dev/null
+++ b/drivers/media/platform/qcom/iris/iris_buffer.c
@@ -0,0 +1,119 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2022-2024 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#include <media/v4l2-mem2mem.h>
+
+#include "iris_buffer.h"
+#include "iris_instance.h"
+
+#define PIXELS_4K 4096
+#define MAX_WIDTH 4096
+#define MAX_HEIGHT 2304
+#define Y_STRIDE_ALIGN 128
+#define UV_STRIDE_ALIGN 128
+#define Y_SCANLINE_ALIGN 32
+#define UV_SCANLINE_ALIGN 16
+#define UV_SCANLINE_ALIGN_QC08C 32
+#define META_STRIDE_ALIGNED 64
+#define META_SCANLINE_ALIGNED 16
+#define NUM_MBS_4K (DIV_ROUND_UP(MAX_WIDTH, 16) * DIV_ROUND_UP(MAX_HEIGHT, 16))
+
+/*
+ * NV12:
+ * YUV 4:2:0 image with a plane of 8 bit Y samples followed
+ * by an interleaved U/V plane containing 8 bit 2x2 subsampled
+ * colour difference samples.
+ *
+ * <-Y/UV_Stride (aligned to 128)->
+ * <------- Width ------->
+ * Y Y Y Y Y Y Y Y Y Y Y Y . . . .  ^           ^
+ * Y Y Y Y Y Y Y Y Y Y Y Y . . . .  |           |
+ * Y Y Y Y Y Y Y Y Y Y Y Y . . . .  Height      |
+ * Y Y Y Y Y Y Y Y Y Y Y Y . . . .  |          y_scanlines (aligned to 32)
+ * Y Y Y Y Y Y Y Y Y Y Y Y . . . .  |           |
+ * Y Y Y Y Y Y Y Y Y Y Y Y . . . .  |           |
+ * Y Y Y Y Y Y Y Y Y Y Y Y . . . .  |           |
+ * Y Y Y Y Y Y Y Y Y Y Y Y . . . .  V           |
+ * . . . . . . . . . . . . . . . .              |
+ * . . . . . . . . . . . . . . . .              |
+ * . . . . . . . . . . . . . . . .              |
+ * . . . . . . . . . . . . . . . .              V
+ * U V U V U V U V U V U V . . . .  ^
+ * U V U V U V U V U V U V . . . .  |
+ * U V U V U V U V U V U V . . . .  |
+ * U V U V U V U V U V U V . . . .  uv_scanlines (aligned to 16)
+ * . . . . . . . . . . . . . . . .  |
+ * . . . . . . . . . . . . . . . .  V
+ * . . . . . . . . . . . . . . . .  --> Buffer size aligned to 4K
+ *
+ * y_stride : Width aligned to 128
+ * uv_stride : Width aligned to 128
+ * y_scanlines: Height aligned to 32
+ * uv_scanlines: Height/2 aligned to 16
+ * Total size = align((y_stride * y_scanlines
+ *          + uv_stride * uv_scanlines , 4096)
+ *
+ * Note: All the alignments are hardware requirements.
+ */
+static u32 iris_yuv_buffer_size_nv12(struct iris_inst *inst)
+{
+	u32 y_plane, uv_plane, y_stride, uv_stride, y_scanlines, uv_scanlines;
+	struct v4l2_format *f = inst->fmt_dst;
+
+	y_stride = ALIGN(f->fmt.pix_mp.width, Y_STRIDE_ALIGN);
+	uv_stride = ALIGN(f->fmt.pix_mp.width, UV_STRIDE_ALIGN);
+	y_scanlines = ALIGN(f->fmt.pix_mp.height, Y_SCANLINE_ALIGN);
+	uv_scanlines = ALIGN((f->fmt.pix_mp.height + 1) >> 1, UV_SCANLINE_ALIGN);
+	y_plane = y_stride * y_scanlines;
+	uv_plane = uv_stride * uv_scanlines;
+
+	return ALIGN(y_plane + uv_plane, PIXELS_4K);
+}
+
+static u32 iris_bitstream_buffer_size(struct iris_inst *inst)
+{
+	struct platform_inst_caps *caps = inst->core->iris_platform_data->inst_caps;
+	u32 base_res_mbs = NUM_MBS_4K;
+	u32 frame_size, num_mbs;
+	u32 div_factor = 2;
+
+	num_mbs = iris_get_mbpf(inst);
+	if (num_mbs > NUM_MBS_4K) {
+		div_factor = 4;
+		base_res_mbs = caps->max_mbpf;
+	}
+
+	/*
+	 * frame_size = YUVsize / div_factor
+	 * where YUVsize = resolution_in_MBs * MBs_in_pixel * 3 / 2
+	 */
+	frame_size = base_res_mbs * (16 * 16) * 3 / 2 / div_factor;
+
+	return ALIGN(frame_size, PIXELS_4K);
+}
+
+int iris_get_buffer_size(struct iris_inst *inst,
+			 enum iris_buffer_type buffer_type)
+{
+	switch (buffer_type) {
+	case BUF_INPUT:
+		return iris_bitstream_buffer_size(inst);
+	case BUF_OUTPUT:
+		return iris_yuv_buffer_size_nv12(inst);
+	default:
+		return 0;
+	}
+}
+
+void iris_vb2_queue_error(struct iris_inst *inst)
+{
+	struct v4l2_m2m_ctx *m2m_ctx = inst->m2m_ctx;
+	struct vb2_queue *q;
+
+	q = v4l2_m2m_get_src_vq(m2m_ctx);
+	vb2_queue_error(q);
+	q = v4l2_m2m_get_dst_vq(m2m_ctx);
+	vb2_queue_error(q);
+}