[PATCH v3] media: radio: Critical interrupt bugfix for si470x over i2c

[Douglas Fischer]

Fixed si470x_start() disabling the interrupt signal, causing tune
operations to never complete. This does not affect USB radios
because they poll the registers instead of using the IRQ line.

Stylistic and comment changes from v2.

Signed-off-by: Douglas Fischer <fischerdougl...@gmail.com>
---

diff -uprN linux.orig/drivers/media/radio/si470x/radio-si470x-common.c 
linux/drivers/media/radio/si470x/radio-si470x-common.c
--- linux.orig/drivers/media/radio/si470x/radio-si470x-common.c 2018-01-15 
21:58:10.675620432 -0500
+++ linux/drivers/media/radio/si470x/radio-si470x-common.c      2018-02-25 
19:16:31.785934211 -0500
@@ -377,8 +377,11 @@ int si470x_start(struct si470x_device *r
                goto done;
 
        /* sysconfig 1 */
-       radio->registers[SYSCONFIG1] =
-               (de << 11) & SYSCONFIG1_DE;             /* DE*/
+       radio->registers[SYSCONFIG1] |= 
SYSCONFIG1_RDSIEN|SYSCONFIG1_STCIEN|SYSCONFIG1_RDS;
+       radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_GPIO2;
+       radio->registers[SYSCONFIG1] |= (0x01 << 2); /* GPIO2 */
+       if (de)
+               radio->registers[SYSCONFIG1] |= SYSCONFIG1_DE;
        retval = si470x_set_register(radio, SYSCONFIG1);
        if (retval < 0)
                goto done;