[PATCH] dvb: flexcop: woraround irq stop problem

The flexcop chip often stops generating interrupts after some hours of
operation.  Apparently this can be fixed by resetting register block 0x300 at
each channel change (this is not detailed in the flexcop data books).

This patch also restructures DMA handling and adds a bit of debug code for the
irq problem in case it still happens for someone.

Signed-off-by: Patrick Boettcher <pb@linuxtv.org>
Signed-off-by: Johannes Stezenbach <js@linuxtv.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 32 insertions, 2 deletions

diff --git a/drivers/media/dvb/b2c2/flexcop.c b/drivers/media/dvb/b2c2/flexcop.c
index 8b5d14dd36e3..12873d435406 100644
--- a/drivers/media/dvb/b2c2/flexcop.c
+++ b/drivers/media/dvb/b2c2/flexcop.c
@@ -46,7 +46,7 @@
 
 int b2c2_flexcop_debug;
 module_param_named(debug, b2c2_flexcop_debug,  int, 0644);
-MODULE_PARM_DESC(debug, "set debug level (1=info,2=tuner,4=i2c,8=ts,16=sram (|-able))." DEBSTATUS);
+MODULE_PARM_DESC(debug, "set debug level (1=info,2=tuner,4=i2c,8=ts,16=sram,32=reg (|-able))." DEBSTATUS);
 #undef DEBSTATUS
 
 /* global zero for ibi values */
@@ -173,9 +173,20 @@ static void flexcop_reset(struct flexcop_device *fc)
         fc->write_ibi_reg(fc,ctrl_208,ibi_zero);
 
         v210.raw = 0;
-        v210.sw_reset_210.reset_blocks = 0xff;
+        v210.sw_reset_210.reset_block_000 = 1;
+        v210.sw_reset_210.reset_block_100 = 1;
+        v210.sw_reset_210.reset_block_200 = 1;
+        v210.sw_reset_210.reset_block_300 = 1;
+        v210.sw_reset_210.reset_block_400 = 1;
+        v210.sw_reset_210.reset_block_500 = 1;
+        v210.sw_reset_210.reset_block_600 = 1;
+        v210.sw_reset_210.reset_block_700 = 1;
         v210.sw_reset_210.Block_reset_enable = 0xb2;
+
+        v210.sw_reset_210.Special_controls = 0xc259;
+
         fc->write_ibi_reg(fc,sw_reset_210,v210);
+        msleep(1);
 
 /* reset the periphical devices */
 
@@ -186,6 +197,25 @@ static void flexcop_reset(struct flexcop_device *fc)
         fc->write_ibi_reg(fc,misc_204,v204);
 }
 
+void flexcop_reset_block_300(struct flexcop_device *fc)
+{
+        flexcop_ibi_value v208_save = fc->read_ibi_reg(fc,ctrl_208),
+                                          v210 = fc->read_ibi_reg(fc,sw_reset_210);
+
+        deb_rdump("208: %08x, 210: %08x\n",v208_save.raw,v210.raw);
+
+        fc->write_ibi_reg(fc,ctrl_208,ibi_zero);
+
+        v210.sw_reset_210.reset_block_300 = 1;
+        v210.sw_reset_210.Block_reset_enable = 0xb2;
+
+        fc->write_ibi_reg(fc,sw_reset_210,v210);
+        msleep(1);
+
+        fc->write_ibi_reg(fc,ctrl_208,v208_save);
+}
+EXPORT_SYMBOL(flexcop_reset_block_300);
+
 struct flexcop_device *flexcop_device_kmalloc(size_t bus_specific_len)
 {
         void *bus;