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[media] via-camera: specify XO-1.5 camera clock speed

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For the ov7670 camera to return images at the requested frame rate,
it needs to make calculations based on the clock speed, which is
a completely external factor (depends on the wiring of the system).

On the XO-1.5, which is the only known via-camera user, the camera
is clocked at 90MHz.

Pass this information to the ov7670 driver, to fix an issue where
a framerate of 3x the requested amount was being provided.

Signed-off-by: Daniel Drake <dsd@laptop.org>
Acked-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Daniel Drake 2012-04-30 18:06:27 -03:00 committed by Mauro Carvalho Chehab
parent 3477e2ab0e
commit a39fbb1d74
1 changed files with 13 additions and 2 deletions
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15
drivers/media/video/via-camera.c
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@ -18,6 +18,7 @@
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-chip-ident.h>
#include <media/ov7670.h>
#include <media/videobuf-dma-sg.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
@ -1347,11 +1348,21 @@ static __devinit bool viacam_serial_is_enabled(void)
return false;
}
static struct ov7670_config sensor_cfg = {
/* The XO-1.5 (only known user) clocks the camera at 90MHz. */
.clock_speed = 90,
};
static __devinit int viacam_probe(struct platform_device *pdev)
{
int ret;
struct i2c_adapter *sensor_adapter;
struct viafb_dev *viadev = pdev->dev.platform_data;
struct i2c_board_info ov7670_info = {
.type = "ov7670",
.addr = 0x42 >> 1,
.platform_data = &sensor_cfg,
};
/*
* Note that there are actually two capture channels on
@ -1433,8 +1444,8 @@ static __devinit int viacam_probe(struct platform_device *pdev)
* is OLPC-specific. 0x42 assumption is ov7670-specific.
*/
sensor_adapter = viafb_find_i2c_adapter(VIA_PORT_31);
cam->sensor = v4l2_i2c_new_subdev(&cam->v4l2_dev, sensor_adapter,
"ov7670", 0x42 >> 1, NULL);
cam->sensor = v4l2_i2c_new_subdev_board(&cam->v4l2_dev, sensor_adapter,
&ov7670_info, NULL);
if (cam->sensor == NULL) {
dev_err(&pdev->dev, "Unable to find the sensor!\n");
ret = -ENODEV;