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V4L/DVB (5691): Ov7670: reset clkrc in rgb565 mode 

A bug in the ov7670 sensor causes it to introduce noise unless the CLKRC
register is rewritten *after* setting the image mode.  Naturally,
resetting CLKRC in this way will cause other modes to fail.  So
carefully poke the register only when indicated.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Jonathan Corbet 2007-05-22 00:39:00 -03:00 committed by Mauro Carvalho Chehab
parent 7acf90c70c
commit edd75ede2d
1 changed files with 18 additions and 3 deletions
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21
drivers/media/video/ov7670.c
View File

@ -720,11 +720,21 @@ static int ov7670_s_fmt(struct i2c_client *c, struct v4l2_format *fmt)
struct ov7670_format_struct *ovfmt;
struct ov7670_win_size *wsize;
struct ov7670_info *info = i2c_get_clientdata(c);
unsigned char com7;
unsigned char com7, clkrc;
ret = ov7670_try_fmt(c, fmt, &ovfmt, &wsize);
if (ret)
return ret;
/*
* HACK: if we're running rgb565 we need to grab then rewrite
* CLKRC. If we're *not*, however, then rewriting clkrc hoses
* the colors.
*/
if (fmt->fmt.pix.pixelformat == V4L2_PIX_FMT_RGB565) {
ret = ov7670_read(c, REG_CLKRC, &clkrc);
if (ret)
return ret;
}
/*
* COM7 is a pain in the ass, it doesn't like to be read then
* quickly written afterward. But we have everything we need
@ -744,7 +754,10 @@ static int ov7670_s_fmt(struct i2c_client *c, struct v4l2_format *fmt)
if (wsize->regs)
ret = ov7670_write_array(c, wsize->regs);
info->fmt = ovfmt;
return 0;
if (fmt->fmt.pix.pixelformat == V4L2_PIX_FMT_RGB565 && ret == 0)
ret = ov7670_write(c, REG_CLKRC, clkrc);
return ret;
}
/*
@ -1267,7 +1280,9 @@ static int ov7670_attach(struct i2c_adapter *adapter)
ret = ov7670_detect(client);
if (ret)
goto out_free_info;
i2c_attach_client(client);
ret = i2c_attach_client(client);
if (ret)
goto out_free_info;
return 0;
out_free_info: