V4L/DVB (7311): pvrusb2: Allow digital streaming without encoder firmware

The encoder is not a part of the pipeline when in digital mode, so
streaming is OK in this case even when the encoder's firmware is not
loaded.  Modify the driver core handling of this scenario to permit
streaming.
Signed-off-by: NMike Isely <isely@pobox.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/pvrusb2/pvrusb2-hdw.c

@@ -3352,6 +3352,7 @@ static void pvr2_hdw_cmd_modeswitch(struct pvr2_hdw *hdw,int digitalFl)
 	default: break;
 	}
 
+	pvr2_hdw_untrip_unlocked(hdw);
 	hdw->pathway_state = cmode;
 }
 
@@ -3814,6 +3815,7 @@ static int pvr2_hdw_state_eval(struct pvr2_hdw *hdw)
 	unsigned int st;
 	int state_updated = 0;
 	int callback_flag = 0;
+	int analog_mode;
 
 	pvr2_trace(PVR2_TRACE_STBITS,
 		   "Drive state check START");
@@ -3824,17 +3826,20 @@ static int pvr2_hdw_state_eval(struct pvr2_hdw *hdw)
 	/* Process all state and get back over disposition */
 	state_updated = pvr2_hdw_state_update(hdw);
 
+	analog_mode = (hdw->pathway_state != PVR2_PATHWAY_DIGITAL);
+
 	/* Update master state based upon all other states. */
 	if (!hdw->flag_ok) {
 		st = PVR2_STATE_DEAD;
 	} else if (hdw->fw1_state != FW1_STATE_OK) {
 		st = PVR2_STATE_COLD;
-	} else if (!hdw->state_encoder_ok) {
+	} else if (analog_mode && !hdw->state_encoder_ok) {
 		st = PVR2_STATE_WARM;
-	} else if (hdw->flag_tripped || hdw->flag_decoder_missed) {
+	} else if (hdw->flag_tripped ||
+		   (analog_mode && hdw->flag_decoder_missed)) {
 		st = PVR2_STATE_ERROR;
 	} else if (hdw->state_usbstream_run &&
-		   ((hdw->pathway_state != PVR2_PATHWAY_ANALOG) ||
+		   (!analog_mode ||
 		    (hdw->state_encoder_run && hdw->state_decoder_run))) {
 		st = PVR2_STATE_RUN;
 	} else {