Staging: poch: Parameter to enable synthetic counter

Adds a parameter that causes the hardware to synthesize Rx values
using a counter.

Signed-off-by: Vijay Kumar B. <vijaykumar@bravegnu.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/staging/poch/poch.c b/drivers/staging/poch/poch.c
index 2eb8e3d43c4d6a503ca58cf9de70f44c357ee4a7..1308c7bada8a32654663191dd39107b84ba61082 100644 (file)
--- a/drivers/staging/poch/poch.c
+++ b/drivers/staging/poch/poch.c
@@ -245,6 +245,11 @@ struct poch_dev {
        struct device *dev;
 };
 
+static int synth_rx;
+module_param(synth_rx, bool, 0600);
+MODULE_PARM_DESC(synth_rx,
+               "Synthesize received values using a counter. Default: No");
+
 static dev_t poch_first_dev;
 static struct class *poch_cls;
 static DEFINE_IDR(poch_ids);
@@ -827,9 +832,11 @@ static int poch_open(struct inode *inode, struct file *filp)
                          fpga + FPGA_TX_CTL_REG);
        } else {
                /* Flush RX FIFO and output data to cardbus. */
-               iowrite32(FPGA_RX_CTL_CONT_CAP
-                         | FPGA_RX_CTL_FIFO_FLUSH,
-                         fpga + FPGA_RX_CTL_REG);
+               u32 ctl_val = FPGA_RX_CTL_CONT_CAP | FPGA_RX_CTL_FIFO_FLUSH;
+               if (synth_rx)
+                       ctl_val |= FPGA_RX_CTL_SYNTH_DATA;
+
+               iowrite32(ctl_val, fpga + FPGA_RX_CTL_REG);
        }
 
        atomic_inc(&channel->inited);