diff options
| author | Frank Schaefer <fschaefer.oss@googlemail.com> | 2013-03-26 13:38:40 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2013-03-28 17:54:44 -0300 |
| commit | 1e2e9086c7a668489383a6cb7e7a8d7ac86bca36 (patch) | |
| tree | 18ec883d096053df0c92e6b1e13ac03bbe27ca7c | |
| parent | c8c39796c484fc6f4e45d8d71f3cf55e9ab27e6c (diff) | |
[media] em28xx: write output frame resolution to regs 0x34+0x35 for em25xx family bridges
The Windows driver writes the output resolution to registers 0x34 (width / 16)
and 0x35 (height / 16) always.
We don't know yet what these registers are used for.
Signed-off-by: Frank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
| -rw-r--r-- | drivers/media/usb/em28xx/em28xx-core.c | 7 | ||||
| -rw-r--r-- | drivers/media/usb/em28xx/em28xx-reg.h | 9 |
2 files changed, 15 insertions, 1 deletions
diff --git a/drivers/media/usb/em28xx/em28xx-core.c b/drivers/media/usb/em28xx/em28xx-core.c index 575a46a18e1f..a802128ce9c5 100644 --- a/drivers/media/usb/em28xx/em28xx-core.c +++ b/drivers/media/usb/em28xx/em28xx-core.c @@ -767,6 +767,13 @@ static void em28xx_capture_area_set(struct em28xx *dev, u8 hstart, u8 vstart, em28xx_write_regs(dev, EM28XX_R1E_CWIDTH, &cwidth, 1); em28xx_write_regs(dev, EM28XX_R1F_CHEIGHT, &cheight, 1); em28xx_write_regs(dev, EM28XX_R1B_OFLOW, &overflow, 1); + + /* FIXME: function/meaning of these registers ? */ + /* FIXME: align width+height to multiples of 4 ?! */ + if (dev->is_em25xx) { + em28xx_write_reg(dev, 0x34, width >> 4); + em28xx_write_reg(dev, 0x35, height >> 4); + } } static int em28xx_scaler_set(struct em28xx *dev, u16 h, u16 v) diff --git a/drivers/media/usb/em28xx/em28xx-reg.h b/drivers/media/usb/em28xx/em28xx-reg.h index 1b0ecd6acfe2..622871db04aa 100644 --- a/drivers/media/usb/em28xx/em28xx-reg.h +++ b/drivers/media/usb/em28xx/em28xx-reg.h @@ -48,7 +48,7 @@ #define EM28XX_CHIPCFG2_TS_PACKETSIZE_752 0x03 - /* GPIO/GPO registers */ +/* GPIO/GPO registers */ #define EM2880_R04_GPO 0x04 /* em2880-em2883 only */ #define EM28XX_R08_GPIO 0x08 /* em2820 or upper */ @@ -167,6 +167,13 @@ #define EM28XX_R34_VBI_START_H 0x34 #define EM28XX_R35_VBI_START_V 0x35 +/* + * NOTE: the EM276x (and EM25xx, EM277x/8x ?) (camera bridges) use these + * registers for a different unknown purpose. + * => register 0x34 is set to capture width / 16 + * => register 0x35 is set to capture height / 16 + */ + #define EM28XX_R36_VBI_WIDTH 0x36 #define EM28XX_R37_VBI_HEIGHT 0x37 |