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Commit 1e2e9086 authored by Frank Schaefer's avatar Frank Schaefer Committed by Mauro Carvalho Chehab
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[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: default avatarFrank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent c8c39796

drivers/media/usb/em28xx/em28xx-core.c

+7 −0
Original line number Diff line number Diff line
@@ -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)

drivers/media/usb/em28xx/em28xx-reg.h

+8 −1
Original line number Diff line number Diff line
@@ -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