V4L/DVB (6066): cx88-alsa: Change order of interrupt enabling, fix spurious IRQs

Currently the driver turns on audio interrupts, then sets the audio interrupt
mask to select which interrupts to get.  One could received unwanted
interrupts since the mask is set _after_ interrupts have already been turned
on.  Change the order of the operations, and clear any audio interrupt status
bits that are already set for good measure.

Before changing the SRAM FIFO parameters, make sure the FIFO isn't being used.
This shouldn't happen with just the ALSA driver, as it should never try to
turn on FIFO/RISC/DMA while they are already on.  However, the V4L driver
needs to turn the audio FIFO on for analog audio output to work (undocumented
cx88 bug).  The FIFO parameters are in an inconsistent state while they are
updated, and this results in many FIFO sync error IRQs if the FIFO is in use
while it's in this inconsistent state.

Also create and use a bunch of symbolic constants for audio interrupt mask
bits.

Signed-off-by: Trent Piepho <xyzzy@speakeasy.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 20 insertions, 22 deletions

diff --git a/drivers/media/video/cx88/cx88-alsa.c b/drivers/media/video/cx88/cx88-alsa.c
index 76a8c01208c..ecb9a74ae03 100644
--- a/drivers/media/video/cx88/cx88-alsa.c
+++ b/drivers/media/video/cx88/cx88-alsa.c
@@ -136,12 +136,11 @@ static int _cx88_start_audio_dma(snd_cx88_card_t *chip)
 	struct cx88_core *core=chip->core;
 	struct sram_channel *audio_ch = &cx88_sram_channels[SRAM_CH25];
 
-
-	dprintk(1, "Starting audio DMA for %i bytes/line and %i (%i) lines at address %08x\n",buf->bpl, chip->num_periods, audio_ch->fifo_size / buf->bpl, audio_ch->fifo_start);
+	/* Make sure RISC/FIFO are off before changing FIFO/RISC settings */
+	cx_clear(MO_AUD_DMACNTRL, 0x11);
 
 	/* setup fifo + format - out channel */
-	cx88_sram_channel_setup(chip->core, &cx88_sram_channels[SRAM_CH25],
-				buf->bpl, buf->risc.dma);
+	cx88_sram_channel_setup(chip->core, audio_ch, buf->bpl, buf->risc.dma);
 
 	/* sets bpl size */
 	cx_write(MO_AUDD_LNGTH, buf->bpl);
@@ -149,27 +148,30 @@ static int _cx88_start_audio_dma(snd_cx88_card_t *chip)
 	/* reset counter */
 	cx_write(MO_AUDD_GPCNTRL,GP_COUNT_CONTROL_RESET);
 
+	dprintk(1, "Start audio DMA, %d B/line, %d lines/FIFO, %d lines/irq, "
+		"%d B/irq\n", buf->bpl, cx_read(audio_ch->cmds_start + 8)>>1,
+		chip->num_periods, buf->bpl * chip->num_periods);
+
 	dprintk(1, "Enabling IRQ, setting mask from 0x%x to 0x%x\n",
 		chip->core->pci_irqmask,
 		chip->core->pci_irqmask | PCI_INT_AUDINT);
-	/* enable irqs */
-	cx_set(MO_PCI_INTMSK, chip->core->pci_irqmask | PCI_INT_AUDINT);
-
 
 	/* Enables corresponding bits at AUD_INT_STAT */
-	cx_write(MO_AUD_INTMSK,
-			(1<<16)|
-			(1<<12)|
-			(1<<4)|
-			(1<<0)
-			);
+	cx_write(MO_AUD_INTMSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC |
+				AUD_INT_DN_RISCI2 | AUD_INT_DN_RISCI1);
+
+	/* Clean any pending interrupt bits already set */
+	cx_write(MO_AUD_INTSTAT, ~0);
+
+	/* enable audio irqs */
+	cx_set(MO_PCI_INTMSK, chip->core->pci_irqmask | PCI_INT_AUDINT);
 
 	/* start dma */
 	cx_set(MO_DEV_CNTRL2, (1<<5)); /* Enables Risc Processor */
 	cx_set(MO_AUD_DMACNTRL, 0x11); /* audio downstream FIFO and RISC enable */
 
 	if (debug)
-		cx88_sram_channel_dump(chip->core, &cx88_sram_channels[SRAM_CH25]);
+		cx88_sram_channel_dump(chip->core, audio_ch);
 
 	return 0;
 }
@@ -187,12 +189,8 @@ static int _cx88_stop_audio_dma(snd_cx88_card_t *chip)
 
 	/* disable irqs */
 	cx_clear(MO_PCI_INTMSK, PCI_INT_AUDINT);
-	cx_clear(MO_AUD_INTMSK,
-			(1<<16)|
-			(1<<12)|
-			(1<<4)|
-			(1<<0)
-			);
+	cx_clear(MO_AUD_INTMSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC |
+				AUD_INT_DN_RISCI2 | AUD_INT_DN_RISCI1);
 
 	if (debug)
 		cx88_sram_channel_dump(chip->core, &cx88_sram_channels[SRAM_CH25]);
@@ -239,14 +237,14 @@ static void cx8801_aud_irq(snd_cx88_card_t *chip)
 				   cx88_aud_irqs, ARRAY_SIZE(cx88_aud_irqs),
 				   status, mask);
 	/* risc op code error */
-	if (status & (1 << 16)) {
+	if (status & AUD_INT_OPC_ERR) {
 		printk(KERN_WARNING "%s/0: audio risc op code error\n",core->name);
 		cx_clear(MO_AUD_DMACNTRL, 0x11);
 		cx88_sram_channel_dump(core, &cx88_sram_channels[SRAM_CH25]);
 	}
 
 	/* risc1 downstream */
-	if (status & 0x01) {
+	if (status & AUD_INT_DN_RISCI1) {
 		spin_lock(&chip->reg_lock);
 		count = cx_read(MO_AUDD_GPCNT);
 		spin_unlock(&chip->reg_lock);