From: Daniel Drake Date: Mon, 30 Jun 2008 23:57:39 +0000 (-0300) Subject: V4L/DVB (8318): OV7670: don't reject unsupported settings X-Git-Tag: v2.6.27-rc1~966^2~57 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cd257a6f4dd908d94e504d2431710f0fcfe62036;p=linux-2.6 V4L/DVB (8318): OV7670: don't reject unsupported settings For VIDIOC_G_FMT/VIDIOC_TRY_FMT, the V4L2 API spec states: "Drivers should not return an error code unless the input is ambiguous" "Very simple, inflexible devices may even ignore all input and always return the default parameters." "When the requested buffer type is not supported drivers return an EINVAL error code." i.e. returning errors for unsupported fields is bad, and it's ok to unconditionally overwrite user-requested settings This patch makes ov7670 meet that behaviour, and brings it in line with other drivers e.g. stk-webcam. It also fixes compatibility with (unpatched) gstreamer. Signed-off-by: Daniel Drake Acked-by: Jonathan Corbet Signed-off-by: Mauro Carvalho Chehab --- diff --git a/drivers/media/video/ov7670.c b/drivers/media/video/ov7670.c index d7bfd30f74..5e0d4e2ee5 100644 --- a/drivers/media/video/ov7670.c +++ b/drivers/media/video/ov7670.c @@ -682,17 +682,17 @@ static int ov7670_try_fmt(struct i2c_client *c, struct v4l2_format *fmt, for (index = 0; index < N_OV7670_FMTS; index++) if (ov7670_formats[index].pixelformat == pix->pixelformat) break; - if (index >= N_OV7670_FMTS) - return -EINVAL; + if (index >= N_OV7670_FMTS) { + /* default to first format */ + index = 0; + pix->pixelformat = ov7670_formats[0].pixelformat; + } if (ret_fmt != NULL) *ret_fmt = ov7670_formats + index; /* * Fields: the OV devices claim to be progressive. */ - if (pix->field == V4L2_FIELD_ANY) - pix->field = V4L2_FIELD_NONE; - else if (pix->field != V4L2_FIELD_NONE) - return -EINVAL; + pix->field = V4L2_FIELD_NONE; /* * Round requested image size down to the nearest * we support, but not below the smallest.