Re: [PATCH v10 0/8] Add StarFive Camera Subsystem driver

Hans Verkuil
2023-10-18T08:50:46Z

Hi Jack,

On 18/10/2023 04:37, Jack Zhu wrote:

<snip>

>>> --------------------------------------------------------------------------------
>>> Compliance test for device /dev/v4l-subdev1:
>>>
>>> Driver Info:
>>> Driver version : 6.6.0
>>> Capabilities : 0x00000000
>>
>> But this does not appear for v4l-subdev1.
>>
>> I can't really tell why it doesn't show that. Can you debug a little bit?
>> The code is in v4l2-compliance.cpp, line 1086:
>>
>> ent_id = mi_media_info_for_fd(media_fd, node.g_fd(), &is_invalid, &node.function);
>>
>> The mi_media_info_for_fd() function calls ioctl(media_fd, MEDIA_IOC_DEVICE_INFO, &mdinfo),
>> and that fails for some reason. It could be that media_fd is invalid (would be weird).
>>
>> This could well be a v4l2-compliance bug that you hit with this driver.
>>
>
> On the test board, /dev/v4l-subdev1 is imx219, and the corresponding directory is
> /sys/dev/char/81:3/device. Media0 does not exist in this directory. Therefore, the media_fd
> obtained through mi_get_media_fd(node.g_fd(), node.bus_info) is invalid.
>
> I don't know why media0 does not exist in /sys/dev/char/81:3/device?
>

Can you try again with this v4l2-compliance patch?

I need to dig a bit deeper as to why media0 is missing, but for now try this.

Regards,

Hans

diff --git a/utils/v4l2-compliance/v4l2-compliance.cpp b/utils/v4l2-compliance/v4l2-compliance.cpp
index 7169eefe..29475d6b 100644
--- a/utils/v4l2-compliance/v4l2-compliance.cpp
+++ b/utils/v4l2-compliance/v4l2-compliance.cpp
@@ -968,7 +968,7 @@ err:
}

void testNode(struct node &node, struct node &node_m2m_cap, struct node &expbuf_node, media_type type,
- unsigned frame_count, unsigned all_fmt_frame_count)
+ unsigned frame_count, unsigned all_fmt_frame_count, int parent_media_fd)
{
struct node node2;
struct v4l2_capability vcap = {};
@@ -997,8 +997,12 @@ void testNode(struct node &node, struct node &node_m2m_cap, struct node &expbuf_
memset(&vcap, 0, sizeof(vcap));
}

- if (!node.is_media())
- media_fd = mi_get_media_fd(node.g_fd(), node.bus_info);
+ if (!node.is_media()) {
+ if (parent_media_fd >= 0)
+ media_fd = parent_media_fd;
+ else
+ media_fd = mi_get_media_fd(node.g_fd(), node.bus_info);
+ }

int fd = node.is_media() ? node.g_fd() : media_fd;
if (fd >= 0) {
diff --git a/utils/v4l2-compliance/v4l2-compliance.h b/utils/v4l2-compliance/v4l2-compliance.h
index 7caf254b..c47f25f5 100644
--- a/utils/v4l2-compliance/v4l2-compliance.h
+++ b/utils/v4l2-compliance/v4l2-compliance.h
@@ -308,7 +308,7 @@ int check_ustring(const __u8 *s, int len);
int check_0(const void *p, int len);
int restoreFormat(struct node *node);
void testNode(struct node &node, struct node &node_m2m_cap, struct node &expbuf_node, media_type type,
- unsigned frame_count, unsigned all_fmt_frame_count);
+ unsigned frame_count, unsigned all_fmt_frame_count, int parent_media_fd = -1);
std::string stream_from(const std::string &pixelformat, bool &use_hdr);

// Media Controller ioctl tests