V4L/DVB (3669): Configurable dma buffer size for saa7146-based budget dvb cards
- Issue a warning when more than 80% of the DMA buffer is being used
(probably due to bad IRQ latency). Warnings are rate-limited.
- Introduce a new parameter 'bufsize' (in KByte) which increases the
default DMA buffer of 188 KByte up to 1410 KByte (Activy: 564 KByte).
Signed-off-by: Ingo Schneider <mail@ingo-schneider.de>
Signed-off-by: Oliver Endriss <o.endriss@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
diff --git a/drivers/media/dvb/ttpci/budget-patch.c b/drivers/media/dvb/ttpci/budget-patch.c
index 9fc9185..1b3aaac 100644
--- a/drivers/media/dvb/ttpci/budget-patch.c
+++ b/drivers/media/dvb/ttpci/budget-patch.c
@@ -577,20 +577,6 @@
saa7146_setgpio(dev, 3, SAA7146_GPIO_OUTLO);
// Set RPS1 Address register to point to RPS code (r108 p42)
saa7146_write(dev, RPS_ADDR1, dev->d_rps1.dma_handle);
- // Set Source Line Counter Threshold, using BRS (rCC p43)
- // It generates HS event every TS_HEIGHT lines
- // this is related to TS_WIDTH set in register
- // NUM_LINE_BYTE3 in budget-core.c. If NUM_LINE_BYTE
- // low 16 bits are set to TS_WIDTH bytes (TS_WIDTH=2*188
- //,then RPS_THRESH1
- // should be set to trigger every TS_HEIGHT (512) lines.
- //
- saa7146_write(dev, RPS_THRESH1, (TS_HEIGHT*1) | MASK_12 );
-
- // saa7146_write(dev, RPS_THRESH0, ((TS_HEIGHT/2)<<16) |MASK_28| (TS_HEIGHT/2) |MASK_12 );
- // Enable RPS1 (rFC p33)
- saa7146_write(dev, MC1, (MASK_13 | MASK_29));
-
if (!(budget = kmalloc (sizeof(struct budget_patch), GFP_KERNEL)))
return -ENOMEM;
@@ -602,6 +588,20 @@
return err;
}
+ // Set Source Line Counter Threshold, using BRS (rCC p43)
+ // It generates HS event every TS_HEIGHT lines
+ // this is related to TS_WIDTH set in register
+ // NUM_LINE_BYTE3 in budget-core.c. If NUM_LINE_BYTE
+ // low 16 bits are set to TS_WIDTH bytes (TS_WIDTH=2*188
+ //,then RPS_THRESH1
+ // should be set to trigger every TS_HEIGHT (512) lines.
+ //
+ saa7146_write(dev, RPS_THRESH1, budget->buffer_height | MASK_12 );
+
+ // saa7146_write(dev, RPS_THRESH0, ((TS_HEIGHT/2)<<16) |MASK_28| (TS_HEIGHT/2) |MASK_12 );
+ // Enable RPS1 (rFC p33)
+ saa7146_write(dev, MC1, (MASK_13 | MASK_29));
+
dev->ext_priv = budget;