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[media] em28xx: introduce #define for maximum supported scaling values (register 0x30-0x33)

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The maximum supported scaling value for registers 0x30+0x31 (horizontal scaling)
and 0x32+0x33 (vertical scaling) is 0x3fff, which corresponds to 20% of the
input frame size.

Signed-off-by: Frank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Frank Schaefer 2013-02-10 16:05:11 -03:00 committed by Mauro Carvalho Chehab
parent 84e902aa05
commit 8168532712
2 changed files with 6 additions and 4 deletions
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2
drivers/media/usb/em28xx/em28xx-reg.h
View File

@ -152,6 +152,8 @@
#define EM28XX_R31_HSCALEHIGH 0x31
#define EM28XX_R32_VSCALELOW 0x32
#define EM28XX_R33_VSCALEHIGH 0x33
#define EM28XX_HVSCALE_MAX 0x3fff /* => 20% */
#define EM28XX_R34_VBI_START_H 0x34
#define EM28XX_R35_VBI_START_V 0x35
#define EM28XX_R36_VBI_WIDTH 0x36

8
drivers/media/usb/em28xx/em28xx-video.c
View File

@ -807,12 +807,12 @@ static void get_scale(struct em28xx *dev,
unsigned int maxh = norm_maxh(dev);
*hscale = (((unsigned long)maxw) << 12) / width - 4096L;
if (*hscale >= 0x4000)
*hscale = 0x3fff;
if (*hscale > EM28XX_HVSCALE_MAX)
*hscale = EM28XX_HVSCALE_MAX;
*vscale = (((unsigned long)maxh) << 12) / height - 4096L;
if (*vscale >= 0x4000)
*vscale = 0x3fff;
if (*vscale > EM28XX_HVSCALE_MAX)
*vscale = EM28XX_HVSCALE_MAX;
}
/* ------------------------------------------------------------------