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>

1 files changed, 12 insertions, 12 deletions

diff --git a/drivers/media/dvb/ttpci/budget-patch.c b/drivers/media/dvb/ttpci/budget-patch.c
index 9fc9185a8426..1b3aaac5e763 100644
--- a/drivers/media/dvb/ttpci/budget-patch.c
+++ b/drivers/media/dvb/ttpci/budget-patch.c
@@ -577,6 +577,17 @@ static int budget_patch_attach (struct saa7146_dev* dev, struct saa7146_pci_exte
         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);
+
+        if (!(budget = kmalloc (sizeof(struct budget_patch), GFP_KERNEL)))
+                return -ENOMEM;
+
+        dprintk(2, "budget: %p\n", budget);
+
+        if ((err = ttpci_budget_init (budget, dev, info, THIS_MODULE))) {
+                kfree (budget);
+                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
@@ -585,24 +596,13 @@ static int budget_patch_attach (struct saa7146_dev* dev, struct saa7146_pci_exte
         //,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_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));
 
 
-        if (!(budget = kmalloc (sizeof(struct budget_patch), GFP_KERNEL)))
-                return -ENOMEM;
-
-        dprintk(2, "budget: %p\n", budget);
-
-        if ((err = ttpci_budget_init (budget, dev, info, THIS_MODULE))) {
-                kfree (budget);
-                return err;
-        }
-
-
         dev->ext_priv = budget;
 
         budget->dvb_adapter.priv = budget;