commit 1e2e9086c7a668489383a6cb7e7a8d7ac86bca36
author Frank Schaefer <fschaefer.oss@googlemail.com> Tue Mar 26 13:38:40 2013 -0300
committer Mauro Carvalho Chehab <mchehab@redhat.com> Thu Mar 28 17:54:44 2013 -0300
tree 18ec883d096053df0c92e6b1e13ac03bbe27ca7c
parent c8c39796c484fc6f4e45d8d71f3cf55e9ab27e6c

[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>

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

diff --git a/drivers/media/usb/em28xx/em28xx-reg.h b/drivers/media/usb/em28xx/em28xx-reg.h
index 1b0ecd6..622871d 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