[PATCH v1 4/5] [media] stm32-dcmi: set default format at open()
From: Hans Verkuil <hidden>
Date: 2017-08-04 12:00:09
Also in:
linux-devicetree, linux-media, lkml
On 28/07/17 12:05, Hugues Fruchet wrote:
Ensure that we start with default pixel format and resolution when opening a new instance.
Why? The format is persistent in V4L2 and (re)opening the video device shouldn't change the format. Suppose you use v4l2-ctl to set up a format. E.g. v4l2-ctl -v width=320,height-240. Now run v4l2-ctl -V to get the format and with this code it would suddenly be back to the default! You set up the default format in the dcmi_graph_notify_complete, but after that it is only changed if userspace explicitly requests it. Regards, Hans
quoted hunk ↗ jump to hunk
Signed-off-by: Hugues Fruchet <redacted> --- drivers/media/platform/stm32/stm32-dcmi.c | 49 ++++++++++++++++++------------- 1 file changed, 28 insertions(+), 21 deletions(-)diff --git a/drivers/media/platform/stm32/stm32-dcmi.c b/drivers/media/platform/stm32/stm32-dcmi.c index 4733d1f..2be56b6 100644 --- a/drivers/media/platform/stm32/stm32-dcmi.c +++ b/drivers/media/platform/stm32/stm32-dcmi.c@@ -890,6 +890,28 @@ static int dcmi_enum_frameintervals(struct file *file, void *fh, return 0; } +static int dcmi_set_default_fmt(struct stm32_dcmi *dcmi) +{ + struct v4l2_format f = { + .type = V4L2_BUF_TYPE_VIDEO_CAPTURE, + .fmt.pix = { + .width = CIF_WIDTH, + .height = CIF_HEIGHT, + .field = V4L2_FIELD_NONE, + .pixelformat = dcmi->sd_formats[0]->fourcc, + }, + }; + int ret; + + ret = dcmi_try_fmt(dcmi, &f, NULL); + if (ret) + return ret; + dcmi->sd_format = dcmi->sd_formats[0]; + dcmi->fmt = f; + + return 0; +} + static const struct of_device_id stm32_dcmi_of_match[] = { { .compatible = "st,stm32-dcmi"}, { /* end node */ },@@ -916,7 +938,13 @@ static int dcmi_open(struct file *file) if (ret < 0 && ret != -ENOIOCTLCMD) goto fh_rel; + ret = dcmi_set_default_fmt(dcmi); + if (ret) + goto power_off; + ret = dcmi_set_fmt(dcmi, &dcmi->fmt); + +power_off: if (ret) v4l2_subdev_call(sd, core, s_power, 0); fh_rel:@@ -991,27 +1019,6 @@ static int dcmi_release(struct file *file) .read = vb2_fop_read, }; -static int dcmi_set_default_fmt(struct stm32_dcmi *dcmi) -{ - struct v4l2_format f = { - .type = V4L2_BUF_TYPE_VIDEO_CAPTURE, - .fmt.pix = { - .width = CIF_WIDTH, - .height = CIF_HEIGHT, - .field = V4L2_FIELD_NONE, - .pixelformat = dcmi->sd_formats[0]->fourcc, - }, - }; - int ret; - - ret = dcmi_try_fmt(dcmi, &f, NULL); - if (ret) - return ret; - dcmi->sd_format = dcmi->sd_formats[0]; - dcmi->fmt = f; - return 0; -} - static const struct dcmi_format dcmi_formats[] = { { .fourcc = V4L2_PIX_FMT_RGB565,