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Subject: [media] cx231xx: Fix power ramping issue Author: Devin Heitmueller <[email protected]> Date: Sun Jul 24 15:44:43 2011 -0300 On platforms that have CONFIG_HZ set to 100, the power ramp time effectively ends up being 10ms. However, on those that have a higher CONFIG_HZ, the time ends up *actually* being 5ms, which doesn't allow enough time for the hardware to be fully powered up before attempting to address it via i2c. Change the constant to 10ms, which is long enough for the hardware to power up, and won't really be anymore time than it was previously on platforms with CONFIG_HZ being 100. Credit goes to Mauro Carvalho Chehab and Gerd Hoffmann who previously investigated this issue. Tested with the Hauppauge USBLive 2, with which the problem was readily reproducible after setting CONFIG_HZ to 1000. Signed-off-by: Devin Heitmueller <[email protected]> Cc: Mauro Carvalho Chehab <[email protected]> Cc: Gerd Hoffmann <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]> drivers/media/video/cx231xx/cx231xx.h | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) --- http://git.linuxtv.org/media_tree.git?a=commitdiff;h=a13639c3c66ff3293e0e5f5dd436809b5c4b5f66 diff --git a/drivers/media/video/cx231xx/cx231xx.h b/drivers/media/video/cx231xx/cx231xx.h index c8d0d3d..2000bc6 100644 --- a/drivers/media/video/cx231xx/cx231xx.h +++ b/drivers/media/video/cx231xx/cx231xx.h @@ -43,7 +43,7 @@ #include "cx231xx-conf-reg.h" #define DRIVER_NAME "cx231xx" -#define PWR_SLEEP_INTERVAL 5 +#define PWR_SLEEP_INTERVAL 10 /* I2C addresses for control block in Cx231xx */ #define AFE_DEVICE_ADDRESS 0x60 _______________________________________________ linuxtv-commits mailing list [email protected] http://www.linuxtv.org/cgi-bin/mailman/listinfo/linuxtv-commits
