1 files changed, 38 insertions, 3 deletions

diff --git a/drivers/media/video/pvrusb2/pvrusb2-hdw.c b/drivers/media/video/pvrusb2/pvrusb2-hdw.c
index ad9ed51f7b9d..79b2a544ccba 100644
--- a/drivers/media/video/pvrusb2/pvrusb2-hdw.c
+++ b/drivers/media/video/pvrusb2/pvrusb2-hdw.c
@@ -48,6 +48,10 @@
    before we are allowed to start it running. */
 #define TIME_MSEC_DECODER_WAIT 50
 
+/* This defines a minimum interval that the decoder must be allowed to run
+   before we can safely begin using its streaming output. */
+#define TIME_MSEC_DECODER_STABILIZATION_WAIT 300
+
 /* This defines a minimum interval that the encoder must remain quiet
    before we are allowed to configure it.  I had this originally set to
    50msec, but Martin Dauskardt <martin.dauskardt@gmx.de> reports that
@@ -334,6 +338,7 @@ static int pvr2_hdw_get_eeprom_addr(struct pvr2_hdw *hdw);
 static void pvr2_hdw_internal_find_stdenum(struct pvr2_hdw *hdw);
 static void pvr2_hdw_internal_set_std_avail(struct pvr2_hdw *hdw);
 static void pvr2_hdw_quiescent_timeout(unsigned long);
+static void pvr2_hdw_decoder_stabilization_timeout(unsigned long);
 static void pvr2_hdw_encoder_wait_timeout(unsigned long);
 static void pvr2_hdw_encoder_run_timeout(unsigned long);
 static int pvr2_issue_simple_cmd(struct pvr2_hdw *,u32);
@@ -2462,6 +2467,11 @@ struct pvr2_hdw *pvr2_hdw_create(struct usb_interface *intf,
         hdw->quiescent_timer.data = (unsigned long)hdw;
         hdw->quiescent_timer.function = pvr2_hdw_quiescent_timeout;
 
+        init_timer(&hdw->decoder_stabilization_timer);
+        hdw->decoder_stabilization_timer.data = (unsigned long)hdw;
+        hdw->decoder_stabilization_timer.function =
+                pvr2_hdw_decoder_stabilization_timeout;
+
         init_timer(&hdw->encoder_wait_timer);
         hdw->encoder_wait_timer.data = (unsigned long)hdw;
         hdw->encoder_wait_timer.function = pvr2_hdw_encoder_wait_timeout;
@@ -2675,6 +2685,7 @@ struct pvr2_hdw *pvr2_hdw_create(struct usb_interface *intf,
  fail:
         if (hdw) {
                 del_timer_sync(&hdw->quiescent_timer);
+                del_timer_sync(&hdw->decoder_stabilization_timer);
                 del_timer_sync(&hdw->encoder_run_timer);
                 del_timer_sync(&hdw->encoder_wait_timer);
                 if (hdw->workqueue) {
@@ -2742,6 +2753,7 @@ void pvr2_hdw_destroy(struct pvr2_hdw *hdw)
                 hdw->workqueue = NULL;
         }
         del_timer_sync(&hdw->quiescent_timer);
+        del_timer_sync(&hdw->decoder_stabilization_timer);
         del_timer_sync(&hdw->encoder_run_timer);
         del_timer_sync(&hdw->encoder_wait_timer);
         if (hdw->fw_buffer) {
@@ -4453,7 +4465,7 @@ static int state_check_enable_encoder_run(struct pvr2_hdw *hdw)
 
         switch (hdw->pathway_state) {
         case PVR2_PATHWAY_ANALOG:
-                if (hdw->state_decoder_run) {
+                if (hdw->state_decoder_run && hdw->state_decoder_ready) {
                         /* In analog mode, if the decoder is running, then
                            run the encoder. */
                         return !0;
@@ -4520,6 +4532,17 @@ static void pvr2_hdw_quiescent_timeout(unsigned long data)
 }
 
 
+/* Timeout function for decoder stabilization timer. */
+static void pvr2_hdw_decoder_stabilization_timeout(unsigned long data)
+{
+        struct pvr2_hdw *hdw = (struct pvr2_hdw *)data;
+        hdw->state_decoder_ready = !0;
+        trace_stbit("state_decoder_ready", hdw->state_decoder_ready);
+        hdw->state_stale = !0;
+        queue_work(hdw->workqueue, &hdw->workpoll);
+}
+
+
 /* Timeout function for encoder wait timer. */
 static void pvr2_hdw_encoder_wait_timeout(unsigned long data)
 {
@@ -4558,8 +4581,13 @@ static int state_eval_decoder_run(struct pvr2_hdw *hdw)
                 }
                 hdw->state_decoder_quiescent = 0;
                 hdw->state_decoder_run = 0;
-                /* paranoia - solve race if timer just completed */
+                /* paranoia - solve race if timer(s) just completed */
                 del_timer_sync(&hdw->quiescent_timer);
+                /* Kill the stabilization timer, in case we're killing the
+                   encoder before the previous stabilization interval has
+                   been properly timed. */
+                del_timer_sync(&hdw->decoder_stabilization_timer);
+                hdw->state_decoder_ready = 0;
         } else {
                 if (!hdw->state_decoder_quiescent) {
                         if (!timer_pending(&hdw->quiescent_timer)) {
@@ -4597,10 +4625,16 @@ static int state_eval_decoder_run(struct pvr2_hdw *hdw)
                 if (hdw->flag_decoder_missed) return 0;
                 if (pvr2_decoder_enable(hdw,!0) < 0) return 0;
                 hdw->state_decoder_quiescent = 0;
+                hdw->state_decoder_ready = 0;
                 hdw->state_decoder_run = !0;
+                hdw->decoder_stabilization_timer.expires =
+                        jiffies +
+                        (HZ * TIME_MSEC_DECODER_STABILIZATION_WAIT / 1000);
+                add_timer(&hdw->decoder_stabilization_timer);
         }
         trace_stbit("state_decoder_quiescent",hdw->state_decoder_quiescent);
         trace_stbit("state_decoder_run",hdw->state_decoder_run);
+        trace_stbit("state_decoder_ready", hdw->state_decoder_ready);
         return !0;
 }
 
@@ -4798,7 +4832,8 @@ static unsigned int pvr2_hdw_report_unlocked(struct pvr2_hdw *hdw,int which,
                         buf,acnt,
                         "worker:%s%s%s%s%s%s%s",
                         (hdw->state_decoder_run ?
-                         " <decode:run>" :
+                         (hdw->state_decoder_ready ?
+                          "<decode:run>" : " <decode:start>") :
                          (hdw->state_decoder_quiescent ?
                           "" : " <decode:stop>")),
                         (hdw->state_decoder_quiescent ?