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[media] em28xx: write output frame resolution to regs 0x34+0x35 for em25xx family bridges

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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>
This commit is contained in:
Frank Schaefer 2013-03-26 13:38:40 -03:00 committed by Mauro Carvalho Chehab
parent c8c39796c4
commit 1e2e9086c7
2 changed files with 15 additions and 1 deletions
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7
drivers/media/usb/em28xx/em28xx-core.c
View File

@ -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)

9
drivers/media/usb/em28xx/em28xx-reg.h
View File

@ -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