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| author | Mike Isely <isely@pobox.com> | 2006-03-25 17:43:14 -0600 |
|---|---|---|
| committer | Mike Isely <isely@pobox.com> | 2006-03-25 17:43:14 -0600 |
| commit | aba6cef68fb994d3bea36f80619c35c676de0cdb (patch) | |
| tree | 433a1c37b6db9592abe8b741f2cf9263f984bb34 /linux/drivers/media/video/cx25840 | |
| parent | bdf583dd1cbec85e2760a6825d3ddf571c791870 (diff) | |
| download | mediapointer-dvb-s2-aba6cef68fb994d3bea36f80619c35c676de0cdb.tar.gz mediapointer-dvb-s2-aba6cef68fb994d3bea36f80619c35c676de0cdb.tar.bz2 | |
Reduce FWSEND in cx25840 module due to certain I2C bus adapter limits
From: Mike Isely <isely@pobox.com>
The FWSEND parameter controls the size of the firmware chunks sent
down the I2C bus to the chip. Previously this had been set to 1024
but unfortunately some I2C implementations can't transfer data in such
big gulps. Specifically, the pvrusb2 driver has a hard limit of
around 60 bytes, due to the encapsulation there of I2C traffic into
USB messages. So we have to significantly reduce this parameter.
Acked-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mike Isely <isely@pobox.com>
Diffstat (limited to 'linux/drivers/media/video/cx25840')
| -rw-r--r-- | linux/drivers/media/video/cx25840/cx25840-firmware.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/linux/drivers/media/video/cx25840/cx25840-firmware.c b/linux/drivers/media/video/cx25840/cx25840-firmware.c index 96a45a4be..539de43dd 100644 --- a/linux/drivers/media/video/cx25840/cx25840-firmware.c +++ b/linux/drivers/media/video/cx25840/cx25840-firmware.c @@ -26,7 +26,17 @@ #include "cx25840-core.h" #define FWFILE "v4l-cx25840.fw" -#define FWSEND 1024 + +/* + * Mike Isely <isely@pobox.com> - The FWSEND parameter controls the + * size of the firmware chunks sent down the I2C bus to the chip. + * Previously this had been set to 1024 but unfortunately some I2C + * implementations can't transfer data in such big gulps. + * Specifically, the pvrusb2 driver has a hard limit of around 60 + * bytes, due to the encapsulation there of I2C traffic into USB + * messages. So we have to significantly reduce this parameter. + */ +#define FWSEND 48 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0) #define FWDEV(x) &((x)->adapter->dev) |