[PATCH v1 2/3] media: sun6i-csi: capture: Add enum_framesizes support

[Arash Golgol <arash.golgol@gmail.com>]

Implement VIDIOC_ENUM_FRAMESIZES as a stepwise range from the minimum
and maximum sizes supported by the hardware. The step follows the
alignment enforced by try_fmt: 16 for NV12_16L16 and 2 otherwise.

Assisted-by: Claude:claude-sonnet-5-5
Signed-off-by: Arash Golgol <arash.golgol@gmail.com>
---
 .../sunxi/sun6i-csi/sun6i_csi_capture.c       | 25 +++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi_capture.c b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi_capture.c
index f55edfd0b174..3adb10b62857 100644
--- a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi_capture.c
+++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi_capture.c
@@ -746,6 +746,30 @@ static int sun6i_csi_capture_enum_fmt(struct file *file, void *priv,
 	return 0;
 }
 
+static int sun6i_csi_capture_enum_framesizes(struct file *file, void *priv,
+					     struct v4l2_frmsizeenum *fsize)
+{
+	unsigned int step;
+
+	if (fsize->index != 0)
+		return -EINVAL;
+
+	if (!sun6i_csi_capture_format_find(fsize->pixel_format))
+		return -EINVAL;
+
+	step = 1U << sun6i_csi_capture_format_align(fsize->pixel_format);
+
+	fsize->type = V4L2_FRMSIZE_TYPE_STEPWISE;
+	fsize->stepwise.min_width  = SUN6I_CSI_CAPTURE_WIDTH_MIN;
+	fsize->stepwise.max_width  = SUN6I_CSI_CAPTURE_WIDTH_MAX;
+	fsize->stepwise.step_width = step;
+	fsize->stepwise.min_height = SUN6I_CSI_CAPTURE_HEIGHT_MIN;
+	fsize->stepwise.max_height = SUN6I_CSI_CAPTURE_HEIGHT_MAX;
+	fsize->stepwise.step_height = step;
+
+	return 0;
+}
+
 static int sun6i_csi_capture_g_fmt(struct file *file, void *priv,
 				   struct v4l2_format *format)
 {
@@ -813,6 +837,7 @@ static const struct v4l2_ioctl_ops sun6i_csi_capture_ioctl_ops = {
 	.vidioc_querycap		= sun6i_csi_capture_querycap,
 
 	.vidioc_enum_fmt_vid_cap	= sun6i_csi_capture_enum_fmt,
+	.vidioc_enum_framesizes		= sun6i_csi_capture_enum_framesizes,
 	.vidioc_g_fmt_vid_cap		= sun6i_csi_capture_g_fmt,
 	.vidioc_s_fmt_vid_cap		= sun6i_csi_capture_s_fmt,
 	.vidioc_try_fmt_vid_cap		= sun6i_csi_capture_try_fmt,
-- 
2.34.1