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authorTrent Piepho <xyzzy@speakeasy.org>2009-05-30 21:45:46 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2009-06-23 03:21:20 -0300
commit1ca27379f3673b40edbd2fec53b93c993fdb4f0c (patch)
treed925042ba76dc770a40ec223e1cd1e7b8320d6cd /drivers
parentccb83408b258f7e9f9fe763f9a7d06ebcc21134f (diff)
V4L/DVB (11913): cx231xx: TRY_FMT should not actually set anything
In the TRY_FMT handler the function get_scale() is called to find what the scaler hardware will produce for a requested size. The problem is that get_scale(struct cx231xx *dev, ..., unsigned int *vscale, unsigned int *hscale) saves the calculated scale values into both the pointer arguments and into dev's hscale and vscale fields. TRY_FMT shouldn't actually change anything in the device state. The code to in get_scale() that writes to dev->[hv]scale can just be deleted. In all cases when dev's fields should be modified, get_scale() was called with get_scale(dev, ..., &dev->hscale, &dev->vscale), so dev was getting updated anyway. This didn't actually cause a problem because nothing ever actually made use of the hscale and vscale fields. I changed cx231xx_resolution_set() to use those fields rather than re-calculate them with a call to get_scale(). Updating [hv]scale in cx231xx_resolution_set() isn't necessary because every call of cx231xx_resolution_set() was already preceded by a call to get_scale() or setting the [hv]scale fields, so they will be always be up-to-date w.r.t. width and height. Removing the call to get_scale() from cx231xx_resolution_set() allowed making get_scale() a static function, which is a good thing for something with such a short name. There is already another function with the same name in the em28xx driver, but that one is static. Signed-off-by: Trent Piepho <xyzzy@speakeasy.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/media/video/cx231xx/cx231xx-avcore.c17
-rw-r--r--drivers/media/video/cx231xx/cx231xx-video.c10
-rw-r--r--drivers/media/video/cx231xx/cx231xx.h3
3 files changed, 7 insertions, 23 deletions
diff --git a/drivers/media/video/cx231xx/cx231xx-avcore.c b/drivers/media/video/cx231xx/cx231xx-avcore.c
index 96f07d1473f..28f48f41f21 100644
--- a/drivers/media/video/cx231xx/cx231xx-avcore.c
+++ b/drivers/media/video/cx231xx/cx231xx-avcore.c
@@ -1052,22 +1052,13 @@ int cx231xx_set_audio_decoder_input(struct cx231xx *dev,
/* Set resolution of the video */
int cx231xx_resolution_set(struct cx231xx *dev)
{
- int width, height;
- u32 hscale, vscale;
- int status = 0;
-
- width = dev->width;
- height = dev->height;
-
- get_scale(dev, width, height, &hscale, &vscale);
-
/* set horzontal scale */
- status = vid_blk_write_word(dev, HSCALE_CTRL, hscale);
+ int status = vid_blk_write_word(dev, HSCALE_CTRL, dev->hscale);
+ if (status)
+ return status;
/* set vertical scale */
- status = vid_blk_write_word(dev, VSCALE_CTRL, vscale);
-
- return status;
+ return vid_blk_write_word(dev, VSCALE_CTRL, dev->vscale);
}
/******************************************************************************
diff --git a/drivers/media/video/cx231xx/cx231xx-video.c b/drivers/media/video/cx231xx/cx231xx-video.c
index 6a524d84711..609bae6098d 100644
--- a/drivers/media/video/cx231xx/cx231xx-video.c
+++ b/drivers/media/video/cx231xx/cx231xx-video.c
@@ -893,9 +893,9 @@ static int check_dev(struct cx231xx *dev)
return 0;
}
-void get_scale(struct cx231xx *dev,
- unsigned int width, unsigned int height,
- unsigned int *hscale, unsigned int *vscale)
+static void get_scale(struct cx231xx *dev,
+ unsigned int width, unsigned int height,
+ unsigned int *hscale, unsigned int *vscale)
{
unsigned int maxw = norm_maxw(dev);
unsigned int maxh = norm_maxh(dev);
@@ -907,10 +907,6 @@ void get_scale(struct cx231xx *dev,
*vscale = (((unsigned long)maxh) << 12) / height - 4096L;
if (*vscale >= 0x4000)
*vscale = 0x3fff;
-
- dev->hscale = *hscale;
- dev->vscale = *vscale;
-
}
/* ------------------------------------------------------------------
diff --git a/drivers/media/video/cx231xx/cx231xx.h b/drivers/media/video/cx231xx/cx231xx.h
index e38eb2d425f..a0f823ac6b8 100644
--- a/drivers/media/video/cx231xx/cx231xx.h
+++ b/drivers/media/video/cx231xx/cx231xx.h
@@ -722,9 +722,6 @@ int cx231xx_set_video_input_mux(struct cx231xx *dev, u8 input);
int cx231xx_set_decoder_video_input(struct cx231xx *dev, u8 pin_type, u8 input);
int cx231xx_do_mode_ctrl_overrides(struct cx231xx *dev);
int cx231xx_set_audio_input(struct cx231xx *dev, u8 input);
-void get_scale(struct cx231xx *dev,
- unsigned int width, unsigned int height,
- unsigned int *hscale, unsigned int *vscale);
/* Provided by cx231xx-video.c */
int cx231xx_register_extension(struct cx231xx_ops *dev);