From 44ecf1df9493e6684cd1bb34abb107a0ffe1078a Mon Sep 17 00:00:00 2001 From: Devin Heitmueller Date: Sun, 24 Jul 2011 15:44:43 -0300 Subject: [media] cx231xx: Fix power ramping issue 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 Cc: Mauro Carvalho Chehab Cc: Gerd Hoffmann Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/cx231xx/cx231xx.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/media/video/cx231xx') diff --git a/drivers/media/video/cx231xx/cx231xx.h b/drivers/media/video/cx231xx/cx231xx.h index c8d0d3dee79..2000bc64c49 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 -- cgit v1.2.3-70-g09d2