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authorEzequiel Garcia <ezequiel@vanguardiasur.com.ar>2015-07-03 16:11:42 -0300
committerMauro Carvalho Chehab <mchehab@osg.samsung.com>2015-07-17 09:52:31 -0300
commitd3194520e2790591b5fabeb913dd74af908ca160 (patch)
tree3b23cf317e517f87afb6775567add2221ab7f1e6 /drivers/media/usb/stk1160/stk1160-reg.h
parent890024ad144902bfa637f23b94b396701a88ed88 (diff)
[media] stk1160: Add frame scaling support
This commit implements frame decimation for stk1160, which allows to support format changes instead of a static frame size. The stk1160 supports independent row and column decimation, in two different modes: * set a number of rows/columns units to skip for each unit sent. * set a number of rows/columns units to send for each unit skipped. This effectively allows to achieve different frame scaling ratios. The unit number can be set to either two row/columns sent/skipped, or four row/columns sent/skipped. Since the video format (UYVY) has 4-bytes, using a unit number of two row/columns results in frame color 'shifting', so set to four row/columns sent/skipped. Signed-off-by: Michael Stegemann <michael@stegemann.it> Signed-off-by: Dale Hamel <dale.hamel@srvthe.net> Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'drivers/media/usb/stk1160/stk1160-reg.h')
-rw-r--r--drivers/media/usb/stk1160/stk1160-reg.h34
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/media/usb/stk1160/stk1160-reg.h b/drivers/media/usb/stk1160/stk1160-reg.h
index 3e49da6e7edd..81ff3a15d96e 100644
--- a/drivers/media/usb/stk1160/stk1160-reg.h
+++ b/drivers/media/usb/stk1160/stk1160-reg.h
@@ -33,6 +33,40 @@
*/
#define STK1160_DCTRL 0x100
+/*
+ * Decimation Control Register:
+ * Byte 104: Horizontal Decimation Line Unit Count
+ * Byte 105: Vertical Decimation Line Unit Count
+ * Byte 106: Decimation Control
+ * Bit 0 - Horizontal Decimation Control
+ * 0 Horizontal decimation is disabled.
+ * 1 Horizontal decimation is enabled.
+ * Bit 1 - Decimates Half or More Column
+ * 0 Decimates less than half from original column,
+ * send count unit (0x105) before each unit skipped.
+ * 1 Decimates half or more from original column,
+ * skip count unit (0x105) before each unit sent.
+ * Bit 2 - Vertical Decimation Control
+ * 0 Vertical decimation is disabled.
+ * 1 Vertical decimation is enabled.
+ * Bit 3 - Vertical Greater or Equal to Half
+ * 0 Decimates less than half from original row,
+ * send count unit (0x105) before each unit skipped.
+ * 1 Decimates half or more from original row,
+ * skip count unit (0x105) before each unit sent.
+ * Bit 4 - Decimation Unit
+ * 0 Decimation will work with 2 rows or columns per unit.
+ * 1 Decimation will work with 4 rows or columns per unit.
+ */
+#define STK1160_DMCTRL_H_UNITS 0x104
+#define STK1160_DMCTRL_V_UNITS 0x105
+#define STK1160_DMCTRL 0x106
+#define STK1160_H_DEC_EN BIT(0)
+#define STK1160_H_DEC_MODE BIT(1)
+#define STK1160_V_DEC_EN BIT(2)
+#define STK1160_V_DEC_MODE BIT(3)
+#define STK1160_DEC_UNIT_SIZE BIT(4)
+
/* Capture Frame Start Position */
#define STK116_CFSPO 0x110
#define STK116_CFSPO_STX_L 0x110

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