[PATCH 00/12] misc: xilinx sd-fec driver

Dragan Cvetic draganc at xilinx.com
Tue Mar 19 06:44:25 PDT 2019



> -----Original Message-----
> From: Michal Simek [mailto:michal.simek at xilinx.com]
> Sent: Tuesday 19 March 2019 12:18
> To: Dragan Cvetic <draganc at xilinx.com>; arnd at arndb.de; gregkh at linuxfoundation.org; Michal Simek <michals at xilinx.com>; linux-
> arm-kernel at lists.infradead.org
> Cc: linux-kernel at vger.kernel.org; Derek Kiernan <dkiernan at xilinx.com>
> Subject: Re: [PATCH 00/12] misc: xilinx sd-fec driver
> 
> On 19. 03. 19 13:04, Dragan Cvetic wrote:
> > This patchset is adding the full Soft Decision Forward Error
> > Correction (SD-FEC) driver implementation, driver DT binding and
> > driver documentation.
> >
> > Forward Error Correction (FEC) codes such as Low Density Parity
> > Check (LDPC) and turbo codes provide a means to control errors in
> > data transmissions over unreliable or noisy communication
> > channels. The SD-FEC Integrated Block is an optimized block for
> > soft-decision decoding of these codes. Fixed turbo codes are
> > supported directly, whereas custom and standardized LDPC codes
> > are supported through the ability to specify the parity check
> > matrix through an AXI4-Lite bus or using the optional programmable
> > (PL)-based support logic. For the further information see
> > https://www.xilinx.com/support/documentation/ip_documentation/
> > sd_fec/v1_1/pg256-sdfec-integrated-block.pdf
> >
> > This driver is a platform device driver which supports SDFEC16
> > (16nm) IP. SD-FEC driver supports LDPC decoding and encoding and
> > Turbo code decoding. LDPC codes can be specified on
> > a codeword-by-codeword basis, also a custom LDPC code can be used.
> >
> > The SD-FEC driver exposes a char device interface and supports
> > file operations: open(), close(), poll() and ioctl(). The driver
> > allows only one usage of the device, open() limits the number of
> > driver instances. The driver also utilize Common Clock Framework
> > (CCF).
> >
> > The control and monitoring is supported over ioctl system call.
> > The features supported by ioctl():
> > - enable or disable data pipes to/from device
> > - configure the FEC algorithm parameters
> > - set the order of data
> > - provide a control of a SDFEC bypass option
> > - activates/deactivates SD-FEC
> > - collect and provide statistical data
> > - enable/disable interrupt mode
> >
> > Poll can be utilized to detect errors on IRQ trigger rather than
> > using looping status and stats ioctl's.
> >
> > Reviewed-by: Michal Simek <michal.simek at xilinx.com>
> 
> I am not using this tag a lot that's why I am curious where you got it
> from? I can't see it in Xilinx tree too.
> 
> Thanks,
> Michal

It is copied from the email address in Outlook. I'll correct this to michals at xilinx.com.

Thanks
Dragan


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