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V4L/DVB: gscpa_sonixb: limit ov7630 max framerate at 640x480

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In 640x480, if the reg11 has less than 4, the image is
unstable (the bridge goes into a higher compression mode
which we have not reverse engineered yet).

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans de Goede
2010-02-04 06:10:55 -03:00
committed by Mauro Carvalho Chehab
parent 82e839c9c5
commit 10bb753010
1 changed files with 5 additions and 4 deletions
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9
drivers/media/video/gspca/sonixb.c
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@@ -809,10 +809,11 @@ static void setexposure(struct gspca_dev *gspca_dev)
else if (reg11 > 16) else if (reg11 > 16)
reg11 = 16; reg11 = 16;
/* In 640x480, if the reg11 has less than 3, the image is /* In 640x480, if the reg11 has less than 4, the image is
unstable (not enough bandwidth). */ unstable (the bridge goes into a higher compression mode
if (gspca_dev->width == 640 && reg11 < 3) which we have not reverse engineered yet). */
reg11 = 3; if (gspca_dev->width == 640 && reg11 < 4)
reg11 = 4;
/* frame exposure time in ms = 1000 * reg11 / 30 -> /* frame exposure time in ms = 1000 * reg11 / 30 ->
reg10 = (sd->exposure / 2) * reg10_max / (1000 * reg11 / 30) */ reg10 = (sd->exposure / 2) * reg10_max / (1000 * reg11 / 30) */