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From e2eb4940fd6b819d4db64e2822a2ffca7ee0a7f3 Mon Sep 17 00:00:00 2001
From: Naushir Patuck <naush@raspberrypi.com>
Date: Tue, 21 Apr 2020 16:26:03 +0100
Subject: [PATCH] media: bcm2835-unicam: Re-fetch mbus code from subdev
on a g_fmt call
The sensor subdevice may change the Bayer order if a H/V flip is
requested after a s_fmt call. Unicam g_fmt must call the subdev get_fmt
in case this has happened and return out the correct format 4cc.
Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
---
.../media/platform/bcm2835/bcm2835-unicam.c | 21 ++++++++++++++++++-
1 file changed, 20 insertions(+), 1 deletion(-)
--- a/drivers/media/platform/bcm2835/bcm2835-unicam.c
+++ b/drivers/media/platform/bcm2835/bcm2835-unicam.c
@@ -967,11 +967,30 @@ static int unicam_enum_fmt_vid_cap(struc
static int unicam_g_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_format *f)
{
+ struct v4l2_mbus_framefmt mbus_fmt = {0};
struct unicam_node *node = video_drvdata(file);
+ struct unicam_device *dev = node->dev;
+ const struct unicam_fmt *fmt = NULL;
+ int ret;
- if (node->pad_id == METADATA_PAD)
+ if (node->pad_id != IMAGE_PAD)
return -EINVAL;
+ /*
+ * If a flip has occurred in the sensor, the fmt code might have
+ * changed. So we will need to re-fetch the format from the subdevice.
+ */
+ ret = __subdev_get_format(dev, &mbus_fmt, node->pad_id);
+ if (ret)
+ return -EINVAL;
+
+ /* Find the V4L2 format from mbus code. We must match a known format. */
+ fmt = find_format_by_code(mbus_fmt.code);
+ if (!fmt)
+ return -EINVAL;
+
+ node->fmt = fmt;
+ node->v_fmt.fmt.pix.pixelformat = fmt->fourcc;
*f = node->v_fmt;
return 0;
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