Hi! Please hold on in merging this series, because I have to investigate a hint I got related to the buffer size handshake of the protocol driver: https://www.linuxtv.org/pipermail/linux-dvb/2007-July/019116.html BR, Jasmin **************************************************************************** On 12/21/2017 02:22 PM, Jasmin J. wrote: > From: Jasmin Jessich <jasmin@xxxxxx> > > Some (older) CAMs are really slow in accepting data. I got sometimes the > already known error "CAM tried to send a buffer larger than the ecount > size". I could track it down to the dvb_ca_en50221_write_data function not > waiting between sending the data length high/low and data bytes. In fact > the CAM reported a WR error, which triggered later on the mentioned error. > > The problem is that a simple module parameter can't be used to solve this > by adding timer values, because the protocol handler is used for any CI > interface. A module parameter would be influence all the CAMs on all CI > interfaces. Thus individual timer definitions per CI interface and CAM are > required. > There are two possibilities to implement that, ioctl's and SysFS. > ioctl's require changes in usermode programs and it may take a lot of time > to get this implemented there. > SysFS can be used by simple "cat" and "echo" commands and can be therefore > simply controlled by scripting, which is immediately available. > > I decided to go for the SysFS approach, but the required device to add the > SysFS files was not available in the "struct dvb_device". The first patch > of this series adds this device to the structure and also the setting code. > > The second patch adds the functions to create the SysFS nodes for all > timers and the new timeouts in the en50221 protocol driver. > > The third patch adds the SysFS node documentation. > > Jasmin Jessich (3): > media: dvb-core: Store device structure in dvb_register_device > media: dvb-core: Added timers for dvb_ca_en50221_write_data > media: dvb-core: Added documentation for ca sysfs timer nodes > > Documentation/ABI/testing/sysfs-class-ca | 63 +++++++++++ > Documentation/media/uapi/dvb/ca-sysfs-nodes.rst | 85 +++++++++++++++ > Documentation/media/uapi/dvb/ca.rst | 1 + > drivers/media/dvb-core/dvb_ca_en50221.c | 132 +++++++++++++++++++++++- > drivers/media/dvb-core/dvbdev.c | 1 + > drivers/media/dvb-core/dvbdev.h | 4 +- > 6 files changed, 284 insertions(+), 2 deletions(-) > create mode 100644 Documentation/ABI/testing/sysfs-class-ca > create mode 100644 Documentation/media/uapi/dvb/ca-sysfs-nodes.rst >
