Commit 0413d3b2 authored by Hans de Goede's avatar Hans de Goede Committed by Mauro Carvalho Chehab
Browse files

[media] gscpa_pac207: Switch to coarse_grained_expo auto gain algorithm 



The pac207's exposure control is a clock-divider, so it goes with quite
big steps. So lets use an autogain algorithm optimised for that.

Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent cd92c1a6

drivers/media/video/gspca/pac207.c

+2 −5
Original line number Diff line number Diff line
@@ -46,13 +46,11 @@ MODULE_LICENSE("GPL"); 
#define PAC207_EXPOSURE_MIN		3

#define PAC207_EXPOSURE_MAX		90 /* 1 sec expo time / 1 fps */

#define PAC207_EXPOSURE_DEFAULT		5 /* power on default: 3 */

#define PAC207_EXPOSURE_KNEE		9 /* fps: 90 / exposure -> 9: 10 fps */

#define PAC207_EXPOSURE_REG		0x02



#define PAC207_GAIN_MIN			0

#define PAC207_GAIN_MAX			31

#define PAC207_GAIN_DEFAULT		7 /* power on default: 9 */

#define PAC207_GAIN_KNEE		15

#define PAC207_GAIN_REG			0x0e



#define PAC207_AUTOGAIN_DEADZONE	30
@@ -343,9 +341,8 @@ static void pac207_do_auto_gain(struct gspca_dev *gspca_dev) 


	if (sd->autogain_ignore_frames > 0)

		sd->autogain_ignore_frames--;

	else if (gspca_expo_autogain(gspca_dev, avg_lum,

			90, PAC207_AUTOGAIN_DEADZONE,

			PAC207_GAIN_KNEE, PAC207_EXPOSURE_KNEE))

	else if (gspca_coarse_grained_expo_autogain(gspca_dev, avg_lum,

			90, PAC207_AUTOGAIN_DEADZONE))

		sd->autogain_ignore_frames = PAC_AUTOGAIN_IGNORE_FRAMES;

}

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