[media] lmedm04: rs2000 check if interrupt urb is over due

Change handling of signal_lock on rs2000. Use ibuf[2] to detect
lock as there is a longer wait for lock to appear in ibuf[6].

Remove last_key and key_timeout and use jiffies plus 60ms
to detect that streaming is still active.

If the current jiffies is time_after the interrupt urb overdue and
clear signal lock.

This results in far faster recovery of lock and streaming.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

1 files changed, 14 insertions, 11 deletions

diff --git a/drivers/media/usb/dvb-usb-v2/lmedm04.c b/drivers/media/usb/dvb-usb-v2/lmedm04.c
index f674dc024d06..7d685bc8c2c0 100644
--- a/drivers/media/usb/dvb-usb-v2/lmedm04.c
+++ b/drivers/media/usb/dvb-usb-v2/lmedm04.c
@@ -125,14 +125,13 @@ DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);
 #define TUNER_RS2000    0x4
 
 struct lme2510_state {
+        unsigned long int_urb_due;
         u8 id;
         u8 tuner_config;
         u8 signal_lock;
         u8 signal_level;
         u8 signal_sn;
         u8 time_key;
-        u8 last_key;
-        u8 key_timeout;
         u8 i2c_talk_onoff;
         u8 i2c_gate;
         u8 i2c_tuner_gate_w;
@@ -323,7 +322,7 @@ static void lme2510_int_response(struct urb *lme_urb)
                                 }
                                 break;
                         case TUNER_RS2000:
-                                if (ibuf[1] == 0x3 &&  ibuf[6] == 0xff)
+                                if (ibuf[2] & 0x1)
                                         st->signal_lock = 0xff;
                                 else
                                         st->signal_lock = 0x00;
@@ -343,7 +342,12 @@ static void lme2510_int_response(struct urb *lme_urb)
                 break;
                 }
         }
+
         usb_submit_urb(lme_urb, GFP_ATOMIC);
+
+        /* interrupt urb is due every 48 msecs while streaming
+         *      add 12msecs for system lag */
+        st->int_urb_due = jiffies + msecs_to_jiffies(60);
 }
 
 static int lme2510_int_read(struct dvb_usb_adapter *adap)
@@ -584,14 +588,13 @@ static int lme2510_msg(struct dvb_usb_device *d,
                         switch (wbuf[3]) {
                         case 0x8c:
                                 rbuf[0] = 0x55;
-                                rbuf[1] = 0xff;
-                                if (st->last_key == st->time_key) {
-                                        st->key_timeout++;
-                                        if (st->key_timeout > 5)
-                                                rbuf[1] = 0;
-                                } else
-                                        st->key_timeout = 0;
-                                st->last_key = st->time_key;
+                                rbuf[1] = st->signal_lock;
+
+                                /* If int_urb_due overdue
+                                 *  set rbuf[1] to 0 to clear lock */
+                                if (time_after(jiffies, st->int_urb_due))
+                                        rbuf[1] = 0;
+
                                 break;
                         default:
                                 lme2510_usb_talk(d, wbuf, wlen, rbuf, rlen);