V4L/DVB: tvp514x: do NOT change the std as a side effect
Several calls (try_fmt, g_parm among others) changed the current standard
as a side effect of that call. But the standard may only be changed by s_std.
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Reviewed-by: Vaibhav Hiremath <hvaibhav@ti.com>
Tested-by: Vaibhav Hiremath <hvaibhav@ti.com>
Acked-by: Vaibhav Hiremath <hvaibhav@ti.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/tvp514x.c b/drivers/media/video/tvp514x.c
index e826114..40d84d7 100644
--- a/drivers/media/video/tvp514x.c
+++ b/drivers/media/video/tvp514x.c
@@ -366,13 +366,13 @@
}
/**
- * tvp514x_get_current_std() : Get the current standard detected by TVP5146/47
+ * tvp514x_query_current_std() : Query the current standard detected by TVP5146/47
* @sd: ptr to v4l2_subdev struct
*
- * Get current standard detected by TVP5146/47, STD_INVALID if there is no
+ * Returns the current standard detected by TVP5146/47, STD_INVALID if there is no
* standard detected.
*/
-static enum tvp514x_std tvp514x_get_current_std(struct v4l2_subdev *sd)
+static enum tvp514x_std tvp514x_query_current_std(struct v4l2_subdev *sd)
{
u8 std, std_status;
@@ -518,7 +518,7 @@
* @std_id: standard V4L2 std_id ioctl enum
*
* Returns the current standard detected by TVP5146/47. If no active input is
- * detected, returns -EINVAL
+ * detected then *std_id is set to 0 and the function returns 0.
*/
static int tvp514x_querystd(struct v4l2_subdev *sd, v4l2_std_id *std_id)
{
@@ -530,10 +530,12 @@
if (std_id == NULL)
return -EINVAL;
- /* get the current standard */
- current_std = tvp514x_get_current_std(sd);
+ *std_id = V4L2_STD_UNKNOWN;
+
+ /* query the current standard */
+ current_std = tvp514x_query_current_std(sd);
if (current_std == STD_INVALID)
- return -EINVAL;
+ return 0;
input_sel = decoder->input;
@@ -575,12 +577,11 @@
/* check whether signal is locked */
sync_lock_status = tvp514x_read_reg(sd, REG_STATUS1);
if (lock_mask != (sync_lock_status & lock_mask))
- return -EINVAL; /* No input detected */
+ return 0; /* No input detected */
- decoder->current_std = current_std;
*std_id = decoder->std_list[current_std].standard.id;
- v4l2_dbg(1, debug, sd, "Current STD: %s",
+ v4l2_dbg(1, debug, sd, "Current STD: %s\n",
decoder->std_list[current_std].standard.name);
return 0;
}
@@ -637,7 +638,6 @@
int err;
enum tvp514x_input input_sel;
enum tvp514x_output output_sel;
- enum tvp514x_std current_std = STD_INVALID;
u8 sync_lock_status, lock_mask;
int try_count = LOCK_RETRY_COUNT;
@@ -721,11 +721,6 @@
/* Allow decoder to sync up with new input */
msleep(LOCK_RETRY_DELAY);
- /* get the current standard for future reference */
- current_std = tvp514x_get_current_std(sd);
- if (current_std == STD_INVALID)
- continue;
-
sync_lock_status = tvp514x_read_reg(sd,
REG_STATUS1);
if (lock_mask == (sync_lock_status & lock_mask))
@@ -733,15 +728,13 @@
break;
}
- if ((current_std == STD_INVALID) || (try_count < 0))
+ if (try_count < 0)
return -EINVAL;
- decoder->current_std = current_std;
decoder->input = input;
decoder->output = output;
- v4l2_dbg(1, debug, sd, "Input set to: %d, std : %d",
- input_sel, current_std);
+ v4l2_dbg(1, debug, sd, "Input set to: %d\n", input_sel);
return 0;
}
@@ -1018,11 +1011,8 @@
pix = &f->fmt.pix;
/* Calculate height and width based on current standard */
- current_std = tvp514x_get_current_std(sd);
- if (current_std == STD_INVALID)
- return -EINVAL;
+ current_std = decoder->current_std;
- decoder->current_std = current_std;
pix->width = decoder->std_list[current_std].width;
pix->height = decoder->std_list[current_std].height;
@@ -1132,15 +1122,8 @@
/* only capture is supported */
return -EINVAL;
- memset(a, 0, sizeof(*a));
- a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
-
/* get the current standard */
- current_std = tvp514x_get_current_std(sd);
- if (current_std == STD_INVALID)
- return -EINVAL;
-
- decoder->current_std = current_std;
+ current_std = decoder->current_std;
cparm = &a->parm.capture;
cparm->capability = V4L2_CAP_TIMEPERFRAME;
@@ -1175,11 +1158,7 @@
timeperframe = &a->parm.capture.timeperframe;
/* get the current standard */
- current_std = tvp514x_get_current_std(sd);
- if (current_std == STD_INVALID)
- return -EINVAL;
-
- decoder->current_std = current_std;
+ current_std = decoder->current_std;
*timeperframe =
decoder->std_list[current_std].standard.frameperiod;